2010 Chevrolet Silverado Owners Manual

For up to 10 seconds after the ignition is turned off and the battery is disconnected, an airbag can still inflate during improper service. You can be injured if you are close to an airbag when it inflates. Avoid yellow connectors. They are probably part of the airbag system. Be sure to follow proper service procedures, and make sure the person performing work for you is qualified to do so.

2-92

Adding Equipment to Your Airbag-Equipped Vehicle

Q: Is there anything I might add to or change about

the vehicle that could keep the airbags from working properly?

A: Yes. If you add things that change your vehicle's frame, bumper system, height, front end or side sheet metal, they may keep the airbag system from working properly. Changing or moving any parts of the front seats, safety belts, the airbag sensing and diagnostic module, steering wheel, instrument panel, roof-rail airbag modules, ceiling headliner or pillar garnish trim, overhead console, front sensors, side impact sensors, rollover sensor module, or airbag wiring can affect the operation of the airbag system. In addition, the vehicle may have a passenger sensing system for the right front passenger's position, which includes sensors that are part of the passenger's seat. The passenger sensing system may not operate properly if the original seat trim is replaced with non-GM covers, upholstery or trim, or with GM covers, upholstery or trim designed for a different vehicle. Any object, such as an aftermarket seat heater or a comfort enhancing pad or device, installed under or on top of the seat fabric, could also interfere with the operation of the passenger sensing system. This could either prevent proper

deployment of the passenger airbag(s) or prevent the passenger sensing system from properly turning off the passenger airbag(s). See Passenger Sensing System on page 2‑86. If you have any questions about this, you should contact Customer Assistance before you modify your vehicle. The phone numbers and addresses for Customer Assistance are in Step Two of the Customer Satisfaction Procedure in this manual. See Customer Satisfaction Procedure on page 8‑2. If the vehicle has rollover roof-rail airbags, see Different Size Tires and Wheels on page 6‑85 for additional important information.

Q: Because I have a disability, I have to get my

vehicle modified. How can I find out whether this will affect my airbag system?

A: If you have questions, call Customer Assistance. The phone numbers and addresses for Customer Assistance are in Step Two of the Customer Satisfaction Procedure in this manual. See Customer Satisfaction Procedure on page 8‑2.

In addition, your dealer/retailer and the service manual have information about the location of the airbag sensors, sensing and diagnostic module and airbag wiring.

Q: What if I added a snow plow? Will it keep the

airbags from working properly?

A: We have designed our airbag systems to work

properly under a wide range of conditions, including snow plowing with vehicles that have the optional Snow Plow Prep Package (RPO VYU). But do not change or defeat the snow plow's “tripping mechanism.” If you do, it can damage your snow plow and your vehicle, and it may cause an airbag inflation.

2-93

Restraint System Check

Checking the Restraint Systems Safety Belts Now and then, check that the safety belt reminder light, safety belts, buckles, latch plates, retractors, and anchorages are all working properly. Look for any other loose or damaged safety belt system parts that might keep a safety belt system from doing its job. See your dealer/retailer to have it repaired. Torn or frayed safety belts may not protect you in a crash. They can rip apart under impact forces. If a belt is torn or frayed, get a new one right away. Make sure the safety belt reminder light is working. See Safety Belt Reminders on page 4‑31 for more information. Keep safety belts clean and dry. See Care of Safety Belts on page 6‑112.

Airbags The airbag system does not need regularly scheduled maintenance or replacement. Make sure the airbag readiness light is working. See Airbag Readiness Light on page 4‑32 for more information. Notice: If an airbag covering is damaged, opened, or broken, the airbag may not work properly. Do not open or break the airbag coverings. If there are any opened or broken airbag covers, have the airbag covering and/or airbag module replaced. For the location of the airbag modules, see What Makes an Airbag Inflate? on page 2‑79. See your dealer/ retailer for service.

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If the vehicle has the LATCH system and it was being used during a crash, you may need new LATCH system parts. New parts and repairs may be necessary even if the safety belt or LATCH system (if equipped), was not being used at the time of the crash. If an airbag inflates, you will need to replace airbag system parts. See the part on the airbag system earlier in this section. Have the safety belt pretensioners checked if the vehicle has been in a crash, if the airbag readiness light stays on after the vehicle is started, or while you are driving. See Airbag Readiness Light on page 4‑32 .

Replacing Restraint System Parts After a Crash

{ WARNING:

A crash can damage the restraint systems in your vehicle. A damaged restraint system may not properly protect the person using it, resulting in serious injury or even death in a crash. To help make sure your restraint systems are working properly after a crash, have them inspected and any necessary replacements made as soon as possible.

If the vehicle has been in a crash, do you need new safety belts or LATCH system (if equipped) parts? After a very minor crash, nothing may be necessary. But the safety belt assemblies that were used during any crash may have been stressed or damaged. See your dealer/retailer to have the safety belt assemblies inspected or replaced.

2-95

2 NOTES

2-96

Section 3

Features and Controls

Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Remote Keyless Entry (RKE) System . . . . . . . . . . . 3-4
Remote Keyless Entry (RKE) System

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Remote Vehicle Start . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Doors and Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Power Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Programmable Automatic Door Locks . . . . . . . . . . 3-10
Rear Door Security Locks . . . . . . . . . . . . . . . . . . . . . 3-10
Lockout Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Rear Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Manual Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Power Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Power Sliding Rear Window . . . . . . . . . . . . . . . . . . . 3-16
Sun Visors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Theft-Deterrent Systems . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Content Theft-Deterrent . . . . . . . . . . . . . . . . . . . . . . . . 3-17
PASS-Key® III+ Electronic Immobilizer . . . . . . . . . 3-19
PASS-Key® III+ Electronic Immobilizer

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19

Starting and Operating Your Vehicle . . . . . . . . . . . . 3-21
New Vehicle Break-In . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
Ignition Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Retained Accessory Power (RAP) . . . . . . . . . . . . . 3-23
Starting the Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23
Fast Idle System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Adjustable Throttle and Brake Pedal . . . . . . . . . . . 3-26
Engine Coolant Heater . . . . . . . . . . . . . . . . . . . . . . . . . 3-26
Active Fuel Management™ . . . . . . . . . . . . . . . . . . . . 3-27
Automatic Transmission Operation . . . . . . . . . . . . . 3-28
Tow/Haul Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-34
Four-Wheel Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-36
Parking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50
Shifting Into Park . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-51
Shifting Out of Park . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-53
Parking Over Things That Burn . . . . . . . . . . . . . . . . 3-53
Engine Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54
Running the Vehicle While Parked . . . . . . . . . . . . . 3-55
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-56
Manual Rearview Mirror . . . . . . . . . . . . . . . . . . . . . . . . 3-56
Automatic Dimming Rearview Mirror . . . . . . . . . . . 3-56
Outside Manual Mirrors . . . . . . . . . . . . . . . . . . . . . . . . 3-56
Outside Towing Mirrors . . . . . . . . . . . . . . . . . . . . . . . . 3-57
Outside Power Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . 3-57
Outside Power Foldaway Mirrors . . . . . . . . . . . . . . 3-58

3-1

Section 3

Features and Controls

Park Tilt Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-59
Outside Convex Mirror . . . . . . . . . . . . . . . . . . . . . . . . . 3-59
Outside Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . . 3-59
Object Detection Systems . . . . . . . . . . . . . . . . . . . . . . . 3-60
Ultrasonic Rear Parking Assist (URPA) . . . . . . . . 3-60
Rear Vision Camera (RVC) . . . . . . . . . . . . . . . . . . . . 3-63
Universal Home Remote System . . . . . . . . . . . . . . . . 3-69

Universal Home Remote System Operation

(With Three Round LED) . . . . . . . . . . . . . . . . . . . . 3-69

Storage Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-75
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-75
Cupholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-75
Instrument Panel Storage . . . . . . . . . . . . . . . . . . . . . 3-76
Center Console Storage . . . . . . . . . . . . . . . . . . . . . . 3-76
Roof Rack System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-77
Rear Seat Armrest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-78
Cargo Management System . . . . . . . . . . . . . . . . . . . 3-78
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-79

3-2

Keys

{ WARNING:

Leaving children in a vehicle with the ignition key is dangerous for many reasons, children or others could be badly injured or even killed. They could operate the power windows or other controls or even make the vehicle move. The windows will function with the keys in the ignition and children could be seriously injured or killed if caught in the path of a closing window. Do not leave the keys in a vehicle with children.

The key is used for the ignition and all door locks. The key has a bar-coded key tag that the dealer/retailer or qualified locksmith can use to make new keys. Store this information in a safe place, not in the vehicle. See your dealer/retailer if a replacement key or additional key is needed. Notice: If you ever lock your keys in the vehicle, you may have to damage the vehicle to get in. Be sure you have spare keys.

3-3

If you are locked out of the vehicle, call the Roadside Assistance Center. See Roadside Assistance Program on page 8‑7 . Remote Keyless Entry (RKE) System See Radio Frequency Statement on page 8‑18 for information regarding Part 15 of the Federal Communications Commission (FCC) Rules and RSS-210/211 of Industry and Science Canada. Changes or modifications to this system by other than an authorized service facility could void authorization to use this equipment. If there is a decrease in the RKE operating range, try this:

. Check the distance. The transmitter may be too far

from the vehicle. Stand closer during rainy or snowy weather.

. Check the location. Other vehicles or objects may be blocking the signal. Take a few steps to the left or right, hold the transmitter higher, and try again.

. Check the transmitter's battery. See “Battery

Replacement” later in this section. If the transmitter is still not working correctly, see your dealer/retailer or a qualified technician for service.

3-4

Remote Keyless Entry (RKE) System Operation The Remote Keyless Entry (RKE) transmitter functions work up to 195 feet (60 m) away from the vehicle. There are other conditions which can affect the performance of the transmitter. See Remote Keyless Entry (RKE) System on page 3‑4.

With Remote Start

(Without Remote Start

Similar)

/ (Remote Vehicle Start): For vehicles with this feature, press / to start the engine from outside the vehicle using the RKE transmitter. See Remote Vehicle Start on page 3‑7 for additional information.

Q (Lock): Press to lock all the doors. If enabled through the Driver Information Center (DIC), the turn signal lamps flash once to indicate locking has occurred. If enabled through the DIC, the horn chirps when Q is pressed again within three seconds. See DIC Vehicle Customization (With DIC Buttons) on page 4‑73 for additional information. Pressing Q arms the content theft‐deterrent system. See Content Theft-Deterrent on page 3‑17. K (Unlock): Press once to unlock only the driver door. If K is pressed again within three seconds, all remaining doors unlock. The interior lamps may come on and stay on for 20 seconds or until the ignition is turned on.

If enabled through the DIC, the turn signal lamps flash twice to indicate unlocking has occurred. See DIC Vehicle Customization (With DIC Buttons) on page 4‑73 . If enabled through the DIC, the exterior lights may turn on. See “APPROACH LIGHTING” under DIC Vehicle Customization (With DIC Buttons) on page 4‑73 . Pressing K on the RKE transmitter disarms the content theft‐deterrent system. See Content Theft-Deterrent on page 3‑17 . L (Vehicle Locator/Panic Alarm): Press and release to locate the vehicle. The turn signal lamps flash and the horn sounds three times. Press and hold L for more than two seconds to activate the panic alarm. The turn signal lamps flash and the horn sounds repeatedly for 30 seconds. The alarm turns off when the ignition is moved to ON/RUN or L is pressed again. The ignition must be in LOCK/OFF for the panic alarm to work.

3-5

Programming Transmitters to the Vehicle Only RKE transmitters programmed to this vehicle will work. If a transmitter is lost or stolen, a replacement can be purchased and programmed through your dealer/retailer. When the replacement transmitter is programmed to this vehicle, all remaining transmitters must also be reprogrammed. Any lost or stolen transmitters will no longer work once the new transmitter is programmed. Each vehicle can have up to eight transmitters programmed to it. See “Relearn Remote Key” under DIC Operation and Displays (With DIC Buttons) on page 4‑49 or DIC Operation and Displays (Without DIC Buttons) on page 4‑56 for instructions on how to match RKE transmitters to your vehicle. Battery Replacement Replace the battery if the REPLACE BATTERY IN REMOTE KEY message displays in the DIC. See “REPLACE BATTERY IN REMOTE KEY” under DIC Warnings and Messages on page 4‑63 for additional information. Notice: When replacing the battery, do not touch any of the circuitry on the transmitter. Static from your body could damage the transmitter.

3-6

To replace the battery:

1. Separate the transmitter with a flat, thin object

inserted into the notch on the side.

2. Remove the old battery. Do not use a metal object. 3.

Insert the new battery, positive side facing down. Replace with a CR2032 or equivalent battery.

4. Snap the transmitter back together.

Remote Vehicle Start Your vehicle may have a remote starting feature. This feature allows you to start the engine from outside of the vehicle. It may also start up the vehicle's heating or air conditioning systems and rear window defogger. Normal operation of the system will return after the key is turned to the ON/RUN position. If your vehicle has an automatic climate control system, the climate control system will default to a heating or cooling mode depending on the outside temperatures. If your vehicle does not have an automatic climate control system, the system will turn on at the setting the vehicle was set to when the vehicle was last turned off. During a remote start, if your vehicle has an automatic climate control system and heated seats, the heated seats will turn on during colder outside temperatures and will shut off when the key is turned to ON/RUN. If your vehicle does not have an automatic climate control system, during remote start, you will need to manually turn the heated seats on and off. See Heated Seats on page 2‑8 for additional information. Laws in some communities may restrict the use of remote starters. For example, some laws may require a person using the remote start to have the vehicle in view when doing so. Check local regulations for any requirements on remote starting of vehicles.

Do not use the remote start feature if your vehicle is low on fuel. Your vehicle may run out of fuel. If your vehicle has the remote start feature, the RKE transmitter functions will have an increased range of operation. However, the range may be less while the vehicle is running. There are other conditions which can affect the performance of the transmitter, see Remote Keyless Entry (RKE) System on page 3‑4 for additional information. / (Remote Start) : This button will be on the RKE transmitter if you have remote start. To start the vehicle using the remote start feature:

1. Aim the transmitter at the vehicle. 2. Press and release the transmitter's lock button. The vehicle's doors will lock. Immediately press and hold the transmitter's remote start button until the turn signal lights flash. If you cannot see the vehicle's lights, press and hold the remote start button for two to four seconds. Pressing the remote start button again after the vehicle has started will turn the engine off. When the vehicle starts, the parking lamps will turn on and remain on while the vehicle is running. If the vehicle is left running it will automatically shut off after 10 minutes unless a time extension has been done.

3-7

3.

If it is the first remote start since the vehicle has been driven, repeat these steps, while the engine is still running, to extend the engine running time by 10 minutes. Remote start can be extended one time.

After entering the vehicle during a remote start, insert and turn the key to RUN to drive the vehicle. To manually shut off a remote start, do any of the following:

. Aim the RKE transmitter at the vehicle and press

the remote start button until the parking lamps turn off. Turn on the hazard warning flashers. Turn the ignition switch on and then off.

The vehicle can be remote started two separate times between driving sequences. The engine will run for 10 minutes after each remote start. Or, you can extend the engine run time by another 10 minutes within the first 10 minute remote start time frame, and before the engine stops. For example, if the lock button and then the remote start buttons are pressed again after the vehicle has been running for five minutes, 10 minutes are added, allowing the engine to run for 15 minutes. The additional ten minutes are considered a second remote vehicle start.

3-8

Once two remote starts, or a single remote start with one time extension has been done, the vehicle must be started with the key. After the key is removed from the ignition, the vehicle can be remote started again. The vehicle cannot be remote started if the key is in the ignition, the hood is not closed, or if there is an emission control system malfunction and the check engine light comes on. Also, the engine will turn off during a remote vehicle start if the coolant temperature gets too high or if the oil pressure gets low. Vehicles that have the remote vehicle start feature are shipped from the factory with the remote vehicle start system enabled. The system may be enabled or disabled through the DIC. See “REMOTE START” under DIC Vehicle Customization (With DIC Buttons) on page 4‑73 for additional information. If your vehicle does not have DIC buttons, see your dealer/retailer to enable or disable the remote vehicle start system. Remote Start Ready If your vehicle does not have the remote vehicle start feature, it may have the remote start ready feature. This feature allows your dealer/retailer to add the manufacturer's remote vehicle start feature. See your dealer/retailer if you would like to add the manufacturer's remote vehicle start feature to your vehicle.

Doors and Locks

Door Locks

{ WARNING:

Unlocked doors can be dangerous. . Passengers, especially children, can easily

open the doors and fall out of a moving vehicle. When a door is locked, the handle will not open it. The chance of being thrown out of the vehicle in a crash is increased if the doors are not locked. So, all passengers should wear safety belts properly and the doors should be locked whenever the vehicle is driven.

. Young children who get into unlocked vehicles

may be unable to get out. A child can be overcome by extreme heat and can suffer permanent injuries or even death from heat stroke. Always lock the vehicle whenever leaving it.

(Continued)

WARNING: (Continued)

. Outsiders can easily enter through an

unlocked door when you slow down or stop your vehicle. Locking your doors can help prevent this from happening.

There are several ways to lock and unlock your vehicle. From the outside, use the Remote Keyless Entry (RKE) transmitter or the key in the driver's door. From the inside, use the power door locks or manual door locks. To lock or unlock the door with the manual locks, push down or pull up on the manual lock knob. Power Door Locks With power door locks, the switches on the front doors can be used to lock and unlock the vehicle. " (Unlock): Press to unlock the doors. Q (Lock): Remove the key from the ignition and press to lock the doors.

3-9

Delayed Locking The vehicle may have the delayed locking feature. When locking the doors with the power lock switch and a door is open, the doors will lock five seconds after the last door is closed. You will hear three chimes to signal that the delayed locking feature is in use. Pressing the power lock switch twice will override the delayed locking feature and immediately lock all the doors. This feature will not operate if the key is in the ignition. You can program this feature using the Driver Information Center (DIC). See DELAY DOOR LOCK under DIC Vehicle Customization (With DIC Buttons) on page 4‑73 . Programmable Automatic Door Locks Vehicles with an automatic lock/unlock feature enable you to program the vehicle's power door locks. You can program this feature through the Driver Information Center (DIC). See DIC Vehicle Customization (With DIC Buttons) on page 4‑73 for more information on DIC programming.

3-10

Rear Door Security Locks Your vehicle has rear door security locks. These prevent passengers from opening the rear doors from the inside.

The rear door security locks are located on the inside edge of each rear door.

The rear doors must be open to access them. The label showing lock and unlock positions is located near the lock. To set the locks, do the following:

1.

Insert the key into the security lock slot and turn it so the slot is in the horizontal position.

2. Close the door.

When you want to open a rear door when the security lock is on, do the following:

1. Unlock the door by lifting the rear door manual

lock, using the power door lock switch, or the Remote Keyless Entry (RKE) transmitter, if the vehicle has one.

2. Open the door from the outside.

To cancel the rear door security lock, do the following:

1. Unlock the door and open it from the outside. 2.

Insert the key into the security lock slot and turn it so the slot is in the vertical position.

Lockout Protection This feature protects you from locking the key in the vehicle when the key is in the ignition and a front door is open. If the driver's side power door lock switch is pressed when the driver's door is open and the key is in the ignition, all of the doors will lock and then the driver's door will unlock. If the passenger's side power door lock switch is pressed when the front passenger's door is open and the key is in the ignition, all of the doors will lock and then the front passenger's door will unlock.

Rear Doors Extended Cab Your vehicle may have a rear access door(s) that allows easier access to the rear area of the extended cab.

To open a rear access door from the outside, first open the front door. Then, use the handle located on the front edge of the rear access door to open it.

You must fully close a rear access door before you can close the front door.

3-11

To open a rear access door from the inside, the front door must be opened first. Then, use the handle located on the inside of the rear access door to open.

Crew Cabs If your vehicle is a crew cab, you can open your doors from the inside or outside. Your vehicle may also have a feature which prevents children from opening the rear doors. See Rear Door Security Locks on page 3‑10 for more information.

Tailgate

{ WARNING:

It is extremely dangerous to ride on the tailgate, even when the vehicle is operated at low speeds. People riding on the tailgate can easily lose their balance and fall in response to vehicle maneuvers. Falling from a moving vehicle may result in serious injuries or death. Do not allow people to ride on the tailgate. Be sure everyone in your vehicle is in a seat and using a safety belt properly.

On vehicles with a lock on the tailgate, use the key to lock or unlock the tailgate. Open the tailgate by lifting up on its handle while pulling the tailgate toward you. To shut the tailgate, firmly push it upward until it latches. After you put the tailgate back up, pull it back towards you to be sure it latches securely.

3-12

Tailgate Removal The tailgate can be removed to allow for different loading situations. Although the tailgate can be removed without assistance, you may want someone to assist you with the removal to avoid possible damage to the vehicle. On vehicles with a rear vision camera, it must be disconnected before removing the tailgate. See Rear Vision Camera (RVC) on page 3‑63 for more information. To remove the tailgate, do the following:

2. With the tailgate about halfway open, lift the right

edge of the tailgate from the lower pivot. On vehicles with the tailgate assist feature, raise the tailgate nearly all the way to the closed position prior to removing the left edge.

3. Move the tailgate to the right to release the

left edge.

Reverse this procedure to reinstall the tailgate. Make sure the tailgate is secure.

1. Raise the tailgate

slightly and release both retaining cable clips. To release the retaining cable clips, lift the cable so it points straight out. Lift the clip over the bolt, and push the cable forward then rotate down.

3-13

Windows

{ WARNING:

Leaving children, helpless adults, or pets in a vehicle with the windows closed is dangerous. They can be overcome by the extreme heat and suffer permanent injuries or even death from heat stroke. Never leave a child, a helpless adult, or a pet alone in a vehicle, especially with the windows closed in warm or hot weather.

3-14

Manual Windows Turn the hand crank on each door to manually raise or lower the manual windows. Power Windows

{ WARNING:

Leaving children in a vehicle with the keys is dangerous for many reasons, children or others could be badly injured or even killed. They could operate the power windows or other controls or even make the vehicle move. The windows will function and they could be seriously injured or killed if caught in the path of a closing window. Do not leave keys in a vehicle with children. When there are children in the rear seat use the window lockout button to prevent unintentional operation of the windows.

Crew Cab shown

If your vehicle has power windows, the controls are located on each of the side doors in the front and rear for crew cab and extended cab models. The driver's door has a switch for the passenger's and rear windows as well. Your power windows will work when the ignition has been turned to ACCESSORY or RUN or when Retained Accessory Power (RAP) is active. See Retained Accessory Power (RAP) on page 3‑23 . Press the switch down to lower the window, and pull up the front of the switch to raise the window.

3-15

Express Down Windows Vehicles with the express down feature allow the driver and front passenger windows to be lowered without holding the switch. Press down fully on the window switch, then release, to activate the express down mode. The express down mode can be canceled at any time by pulling up on the switch. To open the window partway, press the switch to the first depression position, until the window is at the desired position. Window Lockout o (Window Lockout) : If your crew cab or extended cab vehicle has power windows, the driver's door power window switch has a lockout feature. The lockout switch is located in front of the window switches. This feature prevents the rear windows from operating, except from the driver's position. Press the switch to engage or disengage the lockout feature. An indicator light on the switch will come on when the lockout feature is engaged, and will go off when disengaged.

Power Sliding Rear Window

On vehicles with a power sliding rear window, the switch is located in the overhead console.

The power sliding rear window works when the ignition has been turned to ACC/ACCESSORY, ON/RUN, or when Retained Accessory Power (RAP) is active. See Retained Accessory Power (RAP) on page 3‑23
for more information. The power sliding rear window cannot be operated manually. T: Push to open the window. S : Pull to close the window.

3-16

Sun Visors Pull the sun visor down to block glare. Swing the sun visor to the side to cover the side window. The passenger's side sun visor may have a vanity mirror. Theft-Deterrent Systems Vehicle theft is big business, especially in some cities. This vehicle has theft-deterrent features, however, they do not make it impossible to steal. Content Theft-Deterrent Your vehicle may have a content theft-deterrent alarm system.

This is the security light.

To arm the theft-deterrent system:

1. Open the door. 2. Lock the door with the Remote Keyless Entry

(RKE) transmitter. The security light should come on and flash. If the delayed locking feature is active, the alarm will not be activated until all doors are closed and the security light goes off.

3. Close all doors. The security light will stop flashing

and go off after approximately 30 seconds. The content theft deterrent alarm is not armed until the security light goes off.

If a locked driver door is opened without using the RKE transmitter, a ten second pre-alarm will occur. The horn will chirp and the lights will flash. If the key is not placed in the ignition and turned to START or the door is not unlocked by pressing the unlock button on the RKE transmitter during the ten second pre-alarm, the alarm will go off. Your vehicle's headlamps will flash and the horn will sound for about 30 seconds, then will turn off to save the battery power. The theft-deterrent system will not activate if the doors are locked with the vehicle's key or the manual door lock. It activates only if you use the power door lock switch with the door open or the RKE transmitter.

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You should also remember that you can start your vehicle with the correct ignition key if the alarm has been set off. To avoid setting off the alarm by accident:

If you do not want to activate the theft-deterrent system, the vehicle should be locked with the door key after the doors are closed.

. Always unlock a door with the RKE transmitter. Unlocking a door any other way will set off the alarm if the system has been armed.

If you set off the alarm by accident, press unlock on the RKE transmitter or place the key in the ignition and turn it to START to turn it off.

Testing the Alarm To test the alarm:

1. From inside the vehicle, lower the driver's window

and open the driver's door.

2. Activate the system by locking the doors with the

RKE transmitter.

3. Get out of the vehicle, close the door and wait for

the security light to go out.

4. Then reach in through the window, unlock the door

with the manual door lock and open the door. This should set off the alarm.

If the alarm does not sound when it should but the headlamps flash, check to see if the horn works. The horn fuse may be blown. To replace the fuse, see Fuses and Circuit Breakers on page 6‑118. If the alarm does not sound or the headlamps do not flash, see your dealer/retailer for service.

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PASS-Key® III+ Electronic Immobilizer See Radio Frequency Statement on page 8‑18 for information regarding Part 15 of the Federal Communications Commission (FCC) Rules and RSS-210/211 of Industry and Science Canada. PASS-Key® III+ Electronic Immobilizer Operation Your vehicle has PASS-Key® III+ (Personalized Automotive Security System) theft-deterrent system. PASS-Key® III+ is a passive theft-deterrent system. The system is automatically armed when the key is removed from the ignition. The system is automatically disarmed when the key is turned to ON/RUN, ACC/ACCESSORY or START from the LOCK/OFF position.

You do not have to manually arm or disarm the system. The security light will come on if there is a problem with arming or disarming the theft-deterrent system. When the PASS-Key® III+ system senses that someone is using the wrong key, it prevents the vehicle from starting. Anyone using a trial-and-error method to start the vehicle will be discouraged because of the high number of electrical key codes. If the engine does not start and the security light on the instrument panel cluster comes on when trying to start the vehicle, there may be a problem with your theft-deterrent system. Turn the ignition off and try again. If the engine still does not start, and the key appears to be undamaged, try another ignition key. At this time, you may also want to check the fuse, see Fuses and Circuit Breakers on page 6‑118. If the engine still does not start with the other key, your vehicle needs service.

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If your vehicle does start, the first key may be faulty. See your dealer/retailer who can service the PASS-Key® III+ to have a new key made. In an emergency, contact Roadside Assistance. It is possible for the PASS-Key® III+ decoder to learn the transponder value of a new or replacement key. Up to 10 keys may be programmed for the vehicle. The following procedure is for programming additional keys only. If all the currently programmed keys are lost or do not operate, you must see your dealer/retailer or a locksmith who can service PASS-Key® III+ to have keys made and programmed to the system. See your dealer/retailer or a locksmith who can service PASS-Key® III+ to get a new key blank that is cut exactly as the ignition key that operates the system.

To program the new additional key:

1. Verify that the new key has a 1 stamped on it. 2.

Insert the original, already programmed, key in the ignition and start the engine. If the engine will not start, see your dealer/retailer for service.

3. After the engine has started, turn the key to

4.

LOCK/OFF, and remove the key. Insert the new key to be programmed and turn it to the ON/RUN position within five seconds of turning the ignition to the LOCK/OFF position in Step 3. The security light will turn off once the key has been programmed.

5. Repeat Steps 1 through 4 if additional keys are to

be programmed.

If you lose or damage your PASS-Key® III+ key, see your dealer/retailer or a locksmith who can service PASS-Key® III+ to have a new key made. Do not leave the key or device that disarms or deactivates the theft deterrent system in the vehicle.

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Starting and Operating Your Vehicle

New Vehicle Break-In Notice: The vehicle does not need an elaborate break-in. But it will perform better in the long run if you follow these guidelines:

. Keep your speed at 55 mph (88 km/h) or less

for the first 500 miles (805 km).

. Do not drive at any one constant speed,

fast or slow, for the first 500 miles (805 km). Do not make full-throttle starts. Avoid downshifting to brake or slow the vehicle.

. Avoid making hard stops for the first

200 miles (322 km) or so. During this time the new brake linings are not yet broken in. Hard stops with new linings can mean premature wear and earlier replacement. Follow this breaking-in guideline every time you get new brake linings.

. Do not tow a trailer during break-in. See

Towing a Trailer on page 5‑49 for the trailer towing capabilities of the vehicle and more information.

Following break‐in, engine speed and load can be gradually increased.

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Ignition Positions

The ignition switch has four different positions.

To shift out of P (Park), the ignition must be in ON/RUN or ACC/ACCESSORY and the regular brake pedal must be applied. A (LOCK/OFF) : This position locks the ignition. It also locks the transmission on automatic transmission vehicles. The key can be removed in LOCK/OFF. On vehicles with an automatic transmission, the shift lever must be in P (Park) to turn the ignition switch to LOCK/OFF.

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The steering can bind with the wheels turned off center. If this happens, move the steering wheel from right to left while turning the key to ACC/ACCESSORY. If this doesn't work, then the vehicle needs service. Notice: Using a tool to force the key to turn in the ignition could cause damage to the switch or break the key. Use the correct key, make sure it is all the way in, and turn it only with your hand. If the key cannot be turned by hand, see your dealer/retailer. B (ACC/ACCESSORY) : This position lets things like the radio and the windshield wipers operate while the engine is off. Use this position if the vehicle must be pushed or towed. C (ON/RUN) : This position can be used to operate the electrical accessories and to display some instrument panel cluster warning and indicator lights. The switch stays in this position when the engine is running. The transmission is also unlocked in this position on automatic transmission vehicles. If you leave the key in the ACC/ACCESSORY or ON/RUN position with the engine off, the battery could be drained. You may not be able to start the vehicle if the battery is allowed to drain for an extended period of time.

Starting the Engine If the vehicle has the DURAMAX® Diesel engine, see the DURAMAX® Diesel manual for more information. If the vehicle is a Two-mode Hybrid, see the Two-mode Hybrid manual for more information. Notice: Do not try to shift to P (Park) if the vehicle is moving. If you do, you could damage the transmission. Shift to P (Park) only when the vehicle is stopped. Move the shift lever to P (Park) or N (Neutral). The engine will not start in any other position. To restart the engine when the vehicle is already moving, use N (Neutral) only.

D (START) : This is the position that starts the engine. When the engine starts, release the key. The ignition switch returns to ON/RUN for driving. A warning tone will sound when the driver door is opened, the ignition is in ACC/ACCESSORY or LOCK/OFF and the key is in the ignition. Retained Accessory Power (RAP) The following vehicle accessories can be used for up to 10 minutes after the engine is turned off:

. Audio System . Power Windows . OnStar® System (if equipped) . Sunroof (if equipped)

These features work when the key is in ON/RUN or ACC/ACCESSORY. Once the key is turned from ON/RUN to LOCK/OFF, the windows and sunroof continue to work up to 10 minutes until any door is opened. The radio continues to work for up to 10 minutes or until the driver door is opened.

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2.

If the engine does not start after 5‐10 seconds, especially in very cold weather (below 0°F or −18°C), it could be flooded with too much gasoline. Try pushing the accelerator pedal all the way to the floor and holding it there as you hold the key in START for up to 15 seconds. Wait at least 15 seconds between each try, to allow the cranking motor to cool down. When the engine starts, let go of the key and accelerator. If the vehicle starts briefly but then stops again, do the same thing. This clears the extra gasoline from the engine. Do not race the engine immediately after starting it. Operate the engine and transmission gently until the oil warms up and lubricates all moving parts.

Notice: The engine is designed to work with the electronics in the vehicle. If you add electrical parts or accessories, you could change the way the engine operates. Before adding electrical equipment, check with your dealer/retailer. If you do not, the engine might not perform properly. Any resulting damage would not be covered by the vehicle warranty.

Starting Procedure

1. With your foot off the accelerator pedal, turn the ignition key to START. When the engine starts, let go of the key. The idle speed will go down as your engine gets warm. Do not race the engine immediately after starting it. Operate the engine and transmission gently to allow the oil to warm up and lubricate all moving parts. The vehicle has a Computer-Controlled Cranking System. This feature assists in starting the engine and protects components. If the ignition key is turned to the START position, and then released when the engine begins cranking, the engine will continue cranking for a few seconds or until the vehicle starts. If the engine does not start and the key is held in START for many seconds, cranking will be stopped after 15 seconds to prevent cranking motor damage. To prevent gear damage, this system also prevents cranking if the engine is already running. Engine cranking can be stopped by turning the ignition switch to the ACC/ACCESSORY or LOCK/OFF position.

Notice: Cranking the engine for long periods of time, by returning the key to the START position immediately after cranking has ended, can overheat and damage the cranking motor, and drain the battery. Wait at least 15 seconds between each try, to let the cranking motor cool down.

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Fast Idle System Fast Idle System with Switch

If the vehicle has this feature it is available only with cruise control. The manual fast idle switch is operated using the cruise control buttons located on the left hand side of the steering wheel.

This system can be used to increase engine idle speed whenever the following conditions are met:

The park brake is set. The brake pedal is not pressed. The vehicle must not be moving and the accelerator must not be pressed.

To control the fast idle:

To Enable the Fast idle, press and release the Cruise Control On/Off button and ensure that the LED is lit. For the preset Fast Idle, press and release the cruise set switch. This will set the preset fast idle speed. For the variable fast idle, press and hold the accelerator at the desired RPM, then press and release the cruise control cruise set switch to set the desired idle speed.

When the fast idle is active the Driver Information Center (DIC) will display “FAST IDLE ON.” One of the following actions will turn off the fast idle:

. Pressing the brake. . Selecting the Cancel button. . Releasing the Parking Brake.

The transmission shifter is moved out of P (Park) or N (Neutral).

. Selecting the cruise control on/off button when it

was previously on.

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Before you start driving, fully press the brake pedal to confirm the adjustment is right for you. While driving, make only small adjustments. The vehicle may have a memory function which lets pedal settings be saved and recalled. See Memory Seat, Mirrors, and Pedals on page 2‑8 for more information. Engine Coolant Heater The engine heater can provide easier starting and better fuel economy during engine warm-up in cold weather conditions at or below − 18°C (0°F). Vehicles with an engine heater should be plugged in at least four hours before starting. An internal thermostat in the plug-end of the cord may exist which will prevent engine coolant heater operation at temperatures above −18°C (0°F). If the vehicle has the DURAMAX® Diesel engine, see the DURAMAX® Diesel manual for more information.

Adjustable Throttle and Brake Pedal On vehicles with this feature, you can change the position of the throttle and brake pedals. No adjustment to the pedals can be made when the vehicle is in R (Reverse) or while using the cruise control.

The switch used to adjust the pedals is located on the instrument panel below the climate control system.

Press the arrow at the bottom of the switch to move the pedals closer to your body. Press the arrow at the top of the switch to move the pedals away from your body.

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To Use the Engine Coolant Heater 1. Turn off the engine. 2. Open the hood and unwrap the electrical cord.

The cord is secured to the Engine Compartment Fuse Block with a clip. Carefully remove the wire tie which bundles the electrical plug. Do not cut the electrical cord.

3. Plug the cord into a normal, grounded 110-volt

AC outlet.

{ WARNING:

Plugging the cord into an ungrounded outlet could cause an electrical shock. Also, the wrong kind of extension cord could overheat and cause a fire. You could be seriously injured. Plug the cord into a properly grounded three-prong 110-volt AC outlet. If the cord will not reach, use a heavy-duty three-prong extension cord rated for at least 15 amps.

4. Before starting the engine, be sure to unplug and

store the cord as it was before to keep it away from moving engine parts. If you do not, it could be damaged.

The length of time the heater should remain plugged in depends on several factors. Ask a dealer/retailer in the area where you will be parking the vehicle for the best advice on this. Active Fuel Management™ Vehicles with V8 engines may have Active Fuel Management™. This system allows the engine to operate on either all or half of its cylinders, depending on the driving conditions. When less power is required, such as cruising at a constant vehicle speed, the system will operate in the half cylinder mode, allowing the vehicle to achieve better fuel economy. When greater power demands are required, such as accelerating from a stop, passing, or merging onto a freeway, the system will maintain full-cylinder operation. If the vehicle has an Active Fuel Management™ indicator, see DIC Operation and Displays (With DIC Buttons) on page 4‑49 or DIC Operation and Displays (Without DIC Buttons) on page 4‑56 for more information on using this display .

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Automatic Transmission Operation If the vehicle is a Two-mode Hybrid, see the Two-mode Hybrid manual for more information. Vehicles with an automatic transmission have an electronic shift position indicator within the instrument panel cluster. This display comes on when the ignition key is turned to the ON/RUN position. There are several different positions for the shift lever.

Hydra-Matic® 4-Speed

Automatic Transmission

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Heavy Duty 6-Speed Automatic Transmission Shown

(Light Duty 6 Speed Similar)

See “Range Selection Mode” later in this section. P (Park) : This position locks the rear wheels. It is the best position to use when starting the engine because the vehicle cannot move easily. When parked on a hill, especially when the vehicle has a heavy load, you might notice an increase in the effort to shift out of P (Park). See Torque Lock (Automatic Transmission) under Shifting Into Park on page 3‑51 for more information.

{ WARNING:

{ WARNING:

It is dangerous to get out of the vehicle if the shift lever is not fully in P (Park) with the parking brake firmly set. The vehicle can roll. Do not leave the vehicle when the engine is running unless you have to. If you have left the engine running, the vehicle can move suddenly. You or others could be injured. To be sure the vehicle will not move, even when you are on fairly level ground, always set the parking brake and move the shift lever to P (Park). See Shifting Into Park on page 3‑51 . If you are pulling a trailer, see Towing a Trailer on page 5‑49.

If you have Four-Wheel Drive, the vehicle will be free to roll — even if the shift lever is in P (Park) — if the transfer case is in Neutral. So, be sure the transfer case is in a drive gear, Two-Wheel Drive High or Four-Wheel Drive High or Four-Wheel Drive Low — not in Neutral. See Shifting Into Park on page 3‑51.

R (Reverse) : Use this gear to back up. Notice: Shifting to R (Reverse) while the vehicle is moving forward could damage the transmission. The repairs would not be covered by the vehicle warranty. Shift to R (Reverse) only after the vehicle is stopped. To rock the vehicle back and forth to get out of snow, ice, or sand without damaging the transmission, see If Your Vehicle is Stuck in Sand, Mud, Ice, or Snow on page 5‑27 .

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N (Neutral) : In this position, the engine does not connect with the wheels. To restart when you are already moving, use N (Neutral) only. Also, use N (Neutral) when the vehicle is being towed.

{ WARNING:

Shifting into a drive gear while the engine is running at high speed is dangerous. Unless your foot is firmly on the brake pedal, the vehicle could move very rapidly. You could lose control and hit people or objects. Do not shift into a drive gear while the engine is running at high speed.

Notice: Shifting out of P (Park) or N (Neutral) with the engine running at high speed may damage the transmission. The repairs would not be covered by the vehicle warranty. Be sure the engine is not running at high speed when shifting the vehicle.

D (Drive) : This position is for normal driving. It provides the best fuel economy. If you need more power for passing, and you are:

. Going less than about 35 mph (55 km/h), push the

accelerator pedal about halfway down.

. Going about 35 mph (55 km/h) or more, push the

accelerator all the way down. By doing this, the vehicle shifts down to the next gear and has more power.

D (Drive) can be used when towing a trailer, carrying a heavy load, driving on steep hills, or for off-road driving. You might want to shift the transmission to a lower gear selection if the transmission shifts too often. Downshifting the transmission in slippery road conditions could result in skidding. See Skidding under Loss of Control on page 5‑10.

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The vehicle has a shift stabilization feature that adjusts the transmission shifting to the current driving conditions in order to reduce rapid upshifts and downshifts. This shift stabilization feature is designed to determine, before making an upshift, if the engine is able to maintain vehicle speed by analyzing things such as vehicle speed, throttle position, and vehicle load. If the shift stabilization feature determines that a current vehicle speed cannot be maintained, the transmission does not upshift and instead holds the current gear. In some cases, this could appear to be a delayed shift, however the transmission is operating normally. The transmission uses adaptive shift controls. Adaptive shift controls continually compares key shift parameters to pre-programmed ideal shifts stored in the transmissions computer. The transmission constantly makes adjustments to improve vehicle performance according to how the vehicle is being used, such as with a heavy load or when temperature changes. During this adaptive shift control process, shifting might feel different as the transmission determines the best settings. When temperatures are very cold, the Allison Transmission® and Hydra-Matic® 6-Speed transmission's gear shifting could be delayed providing more stable shifts until the engine warms up. Shifts could be more noticeable with a cold transmission. This difference in shifting is normal.

M (Manual Mode) : This position is available on vehicles with the Allison Transmission® or Hydra-Matic® 6-Speed transmission. It lets drivers select the range of gears appropriate for current driving conditions. If the vehicle has this feature, see Range Select Mode (Allison Transmission® or Hydra-Matic® 6-Speed transmission) later in this section. 3 (Third) : This position is also used for normal driving. It reduces vehicle speed more than D (Drive) without using the brakes. You might choose 3 (Third) instead of D (Drive) when driving on hilly, winding roads, when towing a trailer, so there is less shifting between gears and when going down a steep hill. 2 (Second) : This position reduces vehicle speed even more than 3 (Third) without using the brakes. You can use 2 (Second) on hills. It can help control vehicle speed as you go down steep mountain roads, but then you would also want to use the brakes off and on. If you manually select 2 (Second) in an automatic transmission, the transmission will start in second gear. You can use this feature for reducing the speed of the rear wheels when you are trying to start the vehicle from a stop on slippery road surfaces.

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Range Selection Mode (Allison® or Hydra-Matic® 6-Speed Transmission)

The vehicle may have a Range Selection Mode. The Range Selection Mode helps control the vehicle's transmission and vehicle speed while driving down hill or towing a trailer by letting you select a desired range of gears.

1 (First) : For the Hydra-Matic® 4-Speed transmission this position reduces vehicle speed even more than 2 (Second) without using the brakes. You can use it on very steep hills, or in deep snow or mud. If the shift lever is put in 1 (First) while the vehicle is moving forward, the transmission does not shift into first gear until the vehicle is going slowly enough. For an Allison Transmission® or Hydra-Matic® 6-Speed transmission, this position reduces vehicle speed without using the brakes. You can use it for major/ severe downgrades and off-road driving where the vehicle would otherwise accelerate due to steepness of grade. When you shift to 1 (First) it provides the lowest gear appropriate to current road speed and continues to downshift as the vehicle slows, eventually downshifting to 1 (First) gear. Notice: Spinning the tires or holding the vehicle in one place on a hill using only the accelerator pedal may damage the transmission. The repair will not be covered by the vehicle warranty. If you are stuck, do not spin the tires. When stopping on a hill, use the brakes to hold the vehicle in place.

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To use this feature, do the following:

1. Move the shift lever to M (Manual Mode). 2. Press the plus/minus buttons, located on the

steering column shift lever, to select the desired range of gears for current driving conditions.

When M (Manual Mode) is selected a number displays next to the M, indicating the current gear. This number is the highest gear that can be used. However, the vehicle can automatically shift to lower gears as it adjusts to driving conditions. This means that all gears below that number are available. When 5 (Fifth) is selected, 1 (First) through 5 (Fifth) gears are automatically shifted by the vehicle, but 6 (Sixth) cannot be used until the plus/minus button located on the steering column lever is used to change to the gear. Grade Braking is not available when Range Selection Mode is active. See Tow/Haul Mode on page 3‑34. While using Range Selection Mode, cruise control and the Tow/Haul mode can be used.

Notice: Spinning the tires or holding the vehicle in one place on a hill using only the accelerator pedal may damage the transmission. The repair will not be covered by the vehicle warranty. If you are stuck, do not spin the tires. When stopping on a hill, use the brakes to hold the vehicle in place. Low Traction Mode If your vehicle has the Allison Transmission®, or the Hydra-Matic® 6-Speed Automatic Transmission, it has a Low Traction Mode that can assist in vehicle acceleration when road conditions are slippery, such as with ice or snow. While the vehicle is at a stop, select the second gear range using Range Selection Mode. This will limit torque to the wheels after it detects wheel slip, preventing the tires from spinning.

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Tow/Haul Mode

Also see Tow Haul Mode under Towing a Trailer on page 5‑49 for more information. Tow/Haul Mode (Allison Transmission® or Hydra-Matic® 6-Speed Automatic Transmission)

Vehicles with an automatic transmission have a tow/ haul mode. The tow/haul mode adjusts the transmission shift pattern to reduce shift cycling, providing increased performance, vehicle control, and transmission cooling when towing or hauling heavy loads. The selector button is located on the end of the shift lever. Turn the tow/haul on and off by pressing the button. When the tow/haul is on, a light on the instrument panel cluster will come on. See Tow/Haul Mode Light on page 4‑47 for more information.

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Vehicles with an Allison or Hydra-Matic® 6-speed automatic transmission® have a tow/haul mode. The tow/haul mode adjusts the transmission shift pattern to reduce shift cycling, providing increased performance, vehicle control, and transmission cooling when towing or hauling heavy loads.

Turn the tow/haul mode on and off by pressing the button, located on the end of the shift lever. When the tow/haul is on, a light on the instrument panel cluster will come on. See Tow/Haul Mode Light on page 4‑47 for more information. Also see “Tow Haul Mode” under Towing a Trailer on page 5‑49 for more information. Grade Braking (Allison Transmission® or Hydra-Matic® 6-Speed Automatic Transmission) The Grade Braking shift modes can be activated by pressing the button on the end of the shift control lever. While in Range Selection Mode , Grade Braking is deactivated allowing the driver to select a desired range of gears. Grade Braking is only active while the Tow/Haul Mode is selected and you are not in the Range Selection Mode. See “Tow/Haul Mode listed previously and Automatic Transmission Operation on page 3‑28 for more information on the Range Selection Mode. Grade Braking assists in maintaining desired vehicle speeds when driving on downhill grades by automatically implementing a shift schedule that utilizes the engine and transmission to slow the vehicle. This reduces wear on the braking system and increases control of the

vehicle. Grade Braking monitors vehicle speed, acceleration, engine torque and brake pedal usage. Using this information, it detects when the truck is on a downhill grade and the driver desires to slow the vehicle by pressing the brake. Also see Towing a Trailer on page 5‑49 for more information. Cruise Grade Braking (Allison Transmission® or Hydra-Matic® 6-Speed Automatic Transmission) Cruise Grade Braking assists when driving on a downhill grade. It maintains vehicle speed by automatically implementing a shift schedule that uses the engine and the transmission to slow the vehicle. Cruise Grade Braking operates while Cruise Control is engaged in Tow/Haul mode to assist in maintaining vehicle speed under loaded vehicle conditions. It utilizes vehicle acceleration and deviation from desired speed to determine the correct gear for the operating condition. If vehicle speed is above the desired speed the transmission will downshift to slow the vehicle. If vehicle speed is near or below desired speed the trans will upshift, allowing vehicle speed to increase. While in the Range Select Mode (RSM) mode, cruise grade braking is not available. See Automatic Transmission Operation on page 3‑28.

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Manual Transfer Case

The transfer case shift lever is on the floor to the right of the driver. Use this lever to shift into and out of Four-Wheel Drive.

Four-Wheel Drive If the vehicle has Four-Wheel Drive, you can send the engine's driving power to all four wheels for extra traction. To get the most satisfaction out of Four-Wheel Drive, you must be familiar with its operation. Read the following before using Four-Wheel Drive. See the appropriate text for the transfer case in the vehicle. Notice: Driving on clean, dry pavement in Four-Wheel-Drive High or Four-Wheel-Drive Low for an extended period of time may cause premature wear on your vehicle's powertrain. Do not drive on clean, dry pavement in Four-Wheel-Drive High or Four-Wheel-Drive Low for extended periods of time. While driving on clean dry pavement and during tight turns, you may experience vibration in the steering system. If the vehicle has StabiliTrak®, shifting into Four-Wheel-Drive Low will turn Traction Control and StabiliTrak® off. See StabiliTrak® System on page 5‑6. Front Axle The front axle engages and disengages automatically when you shift the transfer case. Some delay for the axle to engage or disengage is normal.

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A Four-Wheel Drive indicator light comes on when you shift into four-wheel drive and the front axle engages. See Four-Wheel-Drive Light on page 4‑47 .

Some delay between shifting and when the indicator light comes on is normal.

Recommended Transfer Case Settings

Driving Conditions

Normal Severe Extreme

Vehicle in Tow*

Transfer Case Settings 2m YES

4m

4n

YES

YES

YES

*See Recreational Vehicle Towing on page 5‑43 or Towing Your Vehicle on page 5‑43

Notice: Driving on clean, dry pavement in four-wheel drive for an extended period of time can cause premature wear on the vehicle's powertrain. Do not drive on clean, dry pavement in Four-Wheel Drive for extended periods of time. 4 n (Four-Wheel-Drive Low): This setting also engages the front axle and delivers extra torque. You may never need Four-Wheel-Drive Low. It sends maximum power to all four wheels. You might choose Four-Wheel-Drive Low if you are driving off-road in deep sand, deep mud, deep snow, and while climbing or descending steep hills. If the vehicle has StabiliTrak®, shifting into Four-Wheel-Drive Low will turn Traction Control and StabiliTrak® off. See StabiliTrak® System on page 5‑6.

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N (Neutral) : Shift to this setting only when the vehicle needs to be towed. See Recreational Vehicle Towing on page 5‑43 or Towing Your Vehicle on page 5‑43. 2 m (Two-Wheel-Drive High): This setting is used for driving in most street and highway situations. The front axle is not engaged in two-wheel drive. This setting also provides the best fuel economy. 4 m (Four-Wheel-Drive High): Use this setting when you need extra traction, such as on snowy or icy roads or in most off-road situations. This setting also engages the front axle to help drive your vehicle. This is the best setting to use when plowing snow. You can shift from Two-Wheel-Drive High to Four-Wheel-Drive High or Four-Wheel-Drive High to Two-Wheel-Drive High while the vehicle is moving. In extremely cold weather, it may be necessary to stop or slow the vehicle to shift into Four-Wheel-Drive High.

A parking brake symbol is located next to the N (Neutral) symbol as a reminder to set the parking brake before shifting the transfer case into N (Neutral).

{ WARNING:

Shifting the transfer case to Neutral can cause the vehicle to roll even if the transmission is in P (Park). You or someone else could be seriously injured. Be sure to set the parking brake before placing the transfer case in Neutral. See Parking Brake on page 3‑50.

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When Using the Manual Transfer Case . Shifting should be made using quick motions.

Shifting slowly may make it more difficult to shift. . You may notice that it is harder to shift when the

vehicle is cold. After the vehicle warms up the shifting will return to normal.

. While in Four-Wheel High or Four-Wheel-Drive

Low you may experience reduced fuel economy. . Avoid driving in Four-Wheel Drive on clean, dry

pavement. It may cause your tires to wear faster, make the transfer case harder to shift, and run noisier. If the transfer case shifter is in the N (Neutral) position and you have difficulty reaching the selected transfer case mode, with the engine running, shift the transmission momentarily to drive and then back to N (Neutral). This will realign the gear teeth in the transfer case and allow you to complete the shift.

Shifting from Two-Wheel-Drive High to Four-Wheel-Drive High . Shifts between Two-Wheel-Drive High and Four-Wheel-Drive High can be made at any vehicle speed.

. Shift the transfer case lever in one continuous

motion into either the Four-Wheel-Drive High or Two-Wheel-Drive High position. In extremely cold weather, it may be necessary to slow or stop the vehicle to shift into Four-Wheel-Drive High until the vehicle has warmed up.

. While in Four-Wheel-Drive High, the vehicle can be

driven at any posted legal speed limit.

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Shifting In or Out of Four-Wheel-Drive Low Notice: Shifting the transfer case into Four-Wheel-Drive Low while moving at speeds faster than 3 mph (5 km/h) may cause premature wear to the transfer case, and may cause the gears to grind. To avoid causing premature wear, and grinding the gears, do not shift the transfer case into Four-Wheel-Drive Low while the vehicle is moving faster than 3 mph (5 km/h). Shifting into Four-Wheel-Drive Low should be done, if possible, with the vehicle at a slight roll, 3 mph (5 km/h) or less.

. Shift the transmission into N (Neutral).

{ WARNING:

Shifting the transfer case to Neutral can cause the vehicle to roll even if the transmission is in P (Park). You or someone else could be seriously injured. Be sure to set the parking brake before placing the transfer case in Neutral. See Parking Brake on page 3‑50.

. Shifting into Four-Wheel-Drive Low with the vehicle at a stop may be more difficult. You may be unable to complete the shift to Four-Wheel-Drive Low, and the transfer case will end up in N (Neutral). This is normal, and is a function of the gear teeth aligning in the transfer case. When this happens, make sure the engine is on, shift the transmission momentarily to D (Drive) and back to N (Neutral), and then complete the transfer case shift.

. Shift the transfer case shift lever in one continuous

motion into the Four-Wheel-Drive Low position. . When Four-Wheel-Drive Low do not drive faster

than 45 mph. This will reduce wear and extend the life of your transfer case.

Shifting In or Out of Neutral

1. With the vehicle running and the engine at an idle

set the parking brake.

2. Place the transmission into N (Neutral).

Shift the transfer case in one continuous motion into or out of the N (Neutral) position.

3-40

Electronic Transfer Case

The transfer case knob is located next to the steering column.

Use the dial to shift into and out of four-wheel drive. Recommended Transfer Case Settings

You can choose among four driving settings: Indicator lights in the dial show which setting you are in. The indicator lights will come on briefly when you turn on the ignition and one will stay on. If the lights do not come on, you should take the vehicle to your dealer/ retailer for service. An indicator light flashes while shifting the transfer case and remains illuminated when the shift is complete. If for some reason the transfer case cannot make a requested shift, it will return to the last chosen setting. 2 m (Two-Wheel-Drive High): This setting is used for driving in most street and highway situations. The front axle is not engaged in Two-Wheel Drive. This setting also provides the best fuel economy.

Driving Conditions

Normal Severe Extreme

Vehicle in Tow*

Transfer Case Settings 2m YES

4m

4n

YES

YES

YES

*See Recreational Vehicle Towing on page 5‑43 or Towing Your Vehicle on page 5‑43

3-41

4 m (Four-Wheel-Drive High): Use the Four-Wheel-Drive High position when extra traction is needed, such as on snowy or icy roads or in most off-road situations. This setting also engages the front axle to help drive the vehicle. This is the best setting to use when plowing snow. 4 n (Four-Wheel-Drive Low): This setting also engages the front axle and delivers extra torque. You may never need this setting. It sends maximum power to all four wheels. You might choose Four-Wheel-Drive Low while driving off-road in deep sand, deep mud, deep snow, and while climbing or descending steep hills. If the vehicle has StabiliTrak®, shifting into Four-Wheel-Drive Low will turn Traction Control and StabiliTrak® off. See StabiliTrak® System on page 5‑6.

{ WARNING:

Shifting the transfer case to N (Neutral) can cause the vehicle to roll even if the transmission is in P (Park). You or someone else could be seriously injured. Be sure to set the parking brake before placing the transfer case in N (Neutral). See Parking Brake on page 3‑50.

N (Neutral) : Shift the vehicle's transfer case to N (Neutral) only when towing the vehicle. See Recreational Vehicle Towing on page 5‑43 or Towing Your Vehicle on page 5‑43 for more information. If the SERVICE 4 WHEEL DRIVE message stays on, you should take the vehicle to your dealer/retailer for service. See “Service 4 Wheel Drive” under DIC Warnings and Messages on page 4‑63.

3-42

Shifting Into Two-Wheel-Drive High Turn the knob to the Two-Wheel-Drive High position. This can be done at any speed, except when shifting from Four-Wheel-Drive Low. See Shifting Out of Four-Wheel-Drive Low for more information. Shifting Into Four-Wheel Drive Low When Four-Wheel-Drive Low is engaged, vehicle speed should be kept below 45 mph. Extended high-speed operation in Four-Wheel-Drive Low may damage or shorten the life of the drivetrain. To shift to the Four-Wheel-Drive Low position, the ignition must be in ON/RUN and the vehicle must be stopped or moving less than 3 mph (5 km/h) with the transmission in N (Neutral). The preferred method for shifting into Four-Wheel-Drive Low is to have the vehicle moving 1 to 2 mph (1.6 to 3.2 km/h). Turn the knob to the Four-Wheel-Drive Low position. You must wait for the Four-Wheel-Drive Low indicator light to stop flashing and remain on before shifting the transmission in gear.

Notice: Shifting the transmission into gear before the requested mode indicator light has stopped flashing could damage the transfer case. To help avoid damaging the vehicle, always wait for the mode indicator lights to stop flashing before shifting the transmission into gear. It is typical for the vehicle to exhibit significant engagement noise and bump when shifting between Four-Wheel-Drive Low and Four-Wheel-Drive High ranges or from transfer case N (Neutral) with the engine running. If the knob is turned to the Four-Wheel-Drive Low position when the vehicle is in gear and/or moving, the Four-Wheel-Drive Low indicator light will flash for 30 seconds and not complete the shift unless the vehicle is moving less than 3 mph (5 km/h) and the transmission is in N (Neutral). After 30 seconds the transfer case will shift to Four-Wheel-Drive High mode.

3-43

Shifting Out of Four-Wheel-Drive Low To shift from Four-Wheel-Drive Low to Four-Wheel-Drive High, or Two-Wheel-Drive High, the vehicle must be stopped or moving less than 3 mph (5 km/h) with the transmission in N (Neutral) and the ignition in ON/RUN. The preferred method for shifting out of Four-Wheel-Drive Low is to have the vehicle moving 1 to 2 mph (1.6 to 3.2 km/h). Turn the knob to the Four-Wheel-Drive High, or Two-Wheel-Drive High position. You must wait for the Four-Wheel-Drive High, or Two-Wheel-Drive High indicator light to stop flashing and remain on before shifting the transmission into gear. Notice: Shifting the transmission into gear before the requested mode indicator light has stopped flashing could damage the transfer case. To help avoid damaging the vehicle, always wait for the mode indicator lights to stop flashing before shifting the transmission into gear. It is typical for the vehicle to exhibit significant engagement noise and bump when shifting between Four-Wheel-Drive Low and Four-Wheel-Drive High ranges or from transfer case N (Neutral) with the engine running.

If the knob is turned to the Four-Wheel-Drive High, or Two-Wheel-Drive High switch position when the vehicle is in gear and/or moving, the Four-Wheel-Drive High, or Two-Wheel-Drive High indicator light will flash for 30 seconds but will not complete the shift unless your vehicle is moving less than 3 mph (5 km/h) and the transmission is in N (Neutral). Shifting into Neutral To shift the transfer case to N (Neutral) do the following:

1. Make sure the vehicle is parked so that it will

not roll.

2. Set the parking brake and press and hold the

regular brake pedal. See Parking Brake on page 3‑50 for more information.

3. Start the vehicle or turn the ignition to ON/RUN. 4. Shift the transmission to N (Neutral). 5. Shift the transfer case to Two-Wheel-Drive High. 6. Turn the transfer case dial clockwise to N (Neutral) until it stops and hold it there until the Neutral light starts blinking. This will take at least 10 seconds. Then slowly release the dial to the four low position. The N (Neutral) light will come on when the transfer case shift to N (Neutral) is complete.

3-44

7.

If the engine is running, verify that the transfer case is in N (Neutral) by shifting the transmission to R (Reverse) for one second, then shift the transmission to D (Drive) for one second.

8. Turn the ignition to ACC/ACCESSORY, which will

turn the engine off.

9. Place the transmission shift lever in P (Park). 10. Release the parking brake prior to moving the

vehicle.

11. Turn the ignition to LOCK/OFF. Shifting Out of Neutral To shift the transfer case out of N (Neutral) do the following:

1. Set the parking brake and apply the regular brake

pedal.

2. Turn the ignition to ON/RUN with the engine off,

and shift the transmission to N (Neutral).

3. Turn the transfer case dial to

Two-Wheel-Drive High. After the transfer case has shifted out of N (Neutral), the N (Neutral) light will go out.

4. Release the parking brake prior to moving the

vehicle.

Notice: Shifting the transmission into gear before the requested mode indicator light has stopped flashing could damage the transfer case. To help avoid damaging the vehicle, always wait for the mode indicator lights to stop flashing before shifting the transmission into gear.

5. Start the engine and shift the transmission to the

desired position.

Excessively shifting the transfer case into or out of the different modes may cause the transfer case to enter the shift protection mode. This will protect the transfer case from possible damage and will only allow the transfer case to respond to one shift per 10 seconds. The transfer case may stay in this mode for up to three minutes.

3-45

Automatic Transfer Case

The transfer case knob is located next to the steering column.

Use the dial to shift into and out of Four-Wheel Drive. You can choose among five driving settings: Indicator lights in the dial show which setting you are in. The indicator lights will come on briefly when you turn on the ignition and one will stay on. If the lights do not come on, you should take the vehicle to your dealer/ retailer for service. An indicator light will flash while shifting the transfer case. It will remain illuminated when the shift is complete. If for some reason the transfer case cannot make a requested shift, it will return to the last chosen setting.

3-46

2 m (Two-Wheel-Drive High): This setting is used for driving in most street and highway situations. The front axle is not engaged in Two-Wheel Drive. This setting also provides the best fuel economy. AUTO (Automatic Four-Wheel Drive) : This setting is ideal for use when road surface traction conditions are variable. When driving the vehicle in AUTO, the front axle is engaged, but the vehicle's power is sent only to the front and rear wheels automatically based on driving conditions. Driving in this mode results in slightly lower fuel economy than Two-Wheel-Drive High. 4 m (Four-Wheel-Drive High): Use the Four-Wheel-Drive High position when extra traction is needed, such as on snowy or icy roads or in most off-road situations. This setting also engages the front axle to help drive the vehicle. This is the best setting to use when plowing snow. 4 n (Four-Wheel-Drive Low): This setting also engages the front axle and delivers extra torque. You may never need this setting. It sends maximum power to all four wheels. You might choose Four-Wheel-Drive Low if you are driving off-road in deep sand, deep mud, deep snow, and while climbing or descending steep hills. If the vehicle has StabiliTrak®, shifting into Four-Wheel-Drive Low will turn Traction Control and StabiliTrak® off. See StabiliTrak® System on page 5‑6.

{ WARNING:

Shifting the transfer case to N (Neutral) can cause the vehicle to roll even if the transmission is in P (Park). You or someone else could be seriously injured. Be sure to set the parking brake before placing the transfer case in N (Neutral). See Parking Brake on page 3‑50.

N (Neutral) : Shift the vehicle's transfer case to N (Neutral) only when towing the vehicle. See Recreational Vehicle Towing on page 5‑43 or Towing Your Vehicle on page 5‑43 for more information. If the SERVICE 4–Wheel Drive message stays on, you should take the vehicle to your dealer/retailer for service. See “Service 4–Wheel Drive message” under DIC Warnings and Messages on page 4‑63.

Shifting Into Four-Wheel-Drive High or AUTO (Automatic Four-Wheel Drive) Turn the knob to the Four-Wheel-Drive High or AUTO position. This can be done at any speed, except when shifting from Four-Wheel-Drive Low. The indicator light will flash while shifting. It will remain on when the shift is completed. Shifting Into Two-Wheel-Drive High Turn the knob to the Two-Wheel-Drive High position. This can be done at any speed, except when shifting from Four-Wheel-Drive Low. The indicator light will flash while shifting. It will remain on when the shift is completed. Shifting Into Four-Wheel-Drive Low When Four-Wheel-Drive Low is engaged, vehicle speed should be kept below 45 mph. Extended high-speed operation in Four-Wheel-Drive Low may damage or shorten the life of the drivetrain. To shift to the Four-Wheel-Drive Low position, the ignition must be in ON/RUN and the vehicle must be stopped or moving less than 3 mph (5 km/h) with the transmission in N (Neutral). The preferred method for shifting into Four-Wheel-Drive Low is to have the vehicle moving 1 to 2 mph (1.6 to 3.2 km/h). Turn the knob to the Four-Wheel-Drive Low position.

3-47

You must wait for the Four-Wheel-Drive Low indicator light to stop flashing and remain on before shifting the transmission into gear. Notice: Shifting the transmission into gear before the requested mode indicator light has stopped flashing could damage the transfer case. To help avoid damaging the vehicle, always wait for the mode indicator lights to stop flashing before shifting the transmission into gear. It is typical for the vehicle to exhibit significant engagement noise and bump when shifting between Four-Wheel-Drive Low and Four-Wheel-Drive High ranges or from N (Neutral) with the engine running. If the knob is turned to the Four-Wheel-Drive Low position when the vehicle is in gear and/or moving, the Four-Wheel-Drive Low indicator light will flash for 30 seconds and not complete the shift unless the vehicle is moving less than 3 mph (5 km/h) and the transmission is in N (Neutral). After 30 seconds the transfer case will shift to Four-Wheel-Drive High mode. Shifting Out of Four-Wheel-Drive Low To shift from Four-Wheel-Drive Low to Four-Wheel-Drive High, AUTO or Two-Wheel-Drive High, the vehicle must be stopped or moving less than 3 mph (5 km/h) with the transmission in N (Neutral) and

the ignition in ON/RUN. The preferred method for shifting out of Four-Wheel-Drive Low is to have the vehicle moving 1 to 2 mph (1.6 to 3.2 km/h). Turn the knob to the Four-Wheel-Drive High, AUTO or Two-Wheel-Drive High position. You must wait for the Four-Wheel-Drive High, AUTO or Two-Wheel-Drive High indicator light to stop flashing and remain on before shifting the transmission into gear. Notice: Shifting the transmission into gear before the requested mode indicator light has stopped flashing could damage the transfer case. To help avoid damaging the vehicle, always wait for the mode indicator lights to stop flashing before shifting the transmission into gear. It is typical for the vehicle to exhibit significant engagement noise and bump when shifting between Four-Wheel-Drive Low and Four-Wheel-Drive High ranges or from N (Neutral) with the engine running. If the knob is turned to the Four-Wheel-Drive High, AUTO, or Two-Wheel-Drive High switch position when the vehicle is in gear and/or moving, the Four-Wheel-Drive High, AUTO or Two-Wheel-Drive High indicator light will flash for 30 seconds but will not complete the shift unless the vehicle is moving less than 3 mph (5 km/h) and the transmission is in N (Neutral).

3-48

Shifting into Neutral To shift the transfer case to N (Neutral) do the following:

1. Make sure the vehicle is parked so that it will

not roll.

2. Set the parking brake and apply the regular brake pedal. See Parking Brake on page 3‑50 for more information.

3. Shifting the transfer case into N (Neutral) can be done with or without the engine running. Shifting without the engine running should be done with the ignition in ON/RUN.

4. Put the transmission in N (Neutral). 5. Shift the transfer case to Two-Wheel Drive High. 6. Turn the transfer case dial clockwise to N (Neutral)

until it stops and hold it there until the N (Neutral) light starts blinking. This will take at least 10 seconds. Then slowly release the dial to the four low position. The N (Neutral) light will come on when the transfer case shift to N (Neutral) is complete. If the engine is running, make sure that the transfer case is in N (Neutral) by shifting the transmission to R (Reverse) for one second, then shift the transmission to D (Drive) for one second.

7.

9. Place the transmission shift lever in P (Park). 10. Release the parking brake prior to moving the

vehicle.

11. Turn the ignition to LOCK/OFF. Shifting Out of Neutral To shift out of N (Neutral) do the following:

1. Set the parking brake and apply the regular brake

pedal.

2. Turn the ignition to ON/RUN with the engine off,

and shift the transmission to N (Neutral).

3. Turn the transfer case dial to Two-Wheel-Drive

High, Four-Wheel-Drive High, AUTO. After the transfer case has shifted out of N (Neutral), the N (Neutral) light will go out.

4. Release the parking brake prior to moving the

vehicle.

Notice: Shifting the transmission into gear before the requested mode indicator light has stopped flashing could damage the transfer case. To help avoid damaging the vehicle, always wait for the mode indicator lights to stop flashing before shifting the transmission into gear.

5. Start the engine and shift the transmission to the

8. Turn the ignition to ACC/ACCESSORY, which will

desired position.

turn the engine off.

3-49

Parking Brake

Notice: Driving with the parking brake on can overheat the brake system and cause premature wear or damage to brake system parts. Make sure that the parking brake is fully released and the brake warning light is off before driving. To release the parking brake, hold the regular brake pedal down, then push down momentarily on the parking brake pedal until you feel the pedal release. Slowly pull your foot up off the park brake pedal. If the parking brake is not released when you begin to drive, the brake system warning light will flash and a chime will sound warning you that the parking brake is still on. If you are towing a trailer and are parking on a hill, see Towing a Trailer on page 5‑49.

Set the parking brake by holding the regular brake pedal down, then pushing down the parking brake pedal. If the ignition is on, the brake system warning light will come on. See Brake System Warning Light on page 4‑37 .

3-50

2. Move the shift lever into the P (Park) position by

pulling the shift lever toward you and moving it up as far as it will go.

3. Be sure the transfer case is in a drive gear — not

in N (Neutral).

4. Turn the ignition key to LOCK/OFF. 5. Remove the key and take it with you. If you can

leave the vehicle with the ignition key in your hand, the vehicle is in P (Park).

Shifting Into Park

{ WARNING:

It can be dangerous to get out of the vehicle if the shift lever is not fully in P (Park) with the parking brake firmly set. The vehicle can roll. If you have left the engine running, the vehicle can move suddenly. You or others could be injured. To be sure the vehicle will not move, even when you are on fairly level ground, use the steps that follow. With four-wheel drive, if the transfer case is in N (Neutral), the vehicle will be free to roll, even if the shift lever is in P (Park). So, be sure the transfer case is in a drive gear — not in N (Neutral). If you are pulling a trailer, see Towing a Trailer on page 5‑49.

1. Hold the brake pedal down, then set the parking

brake. See Parking Brake on page 3‑50 for more information.

3-51

Leaving the Vehicle With the Engine Running

{ WARNING:

It can be dangerous to leave the vehicle with the engine running. The vehicle could move suddenly if the shift lever is not fully in P (Park) with the parking brake firmly set. If you have four-wheel drive and the transfer case is in N (Neutral), the vehicle will be free to roll, even if the shift lever is in P (Park). So be sure the transfer case is in a drive gear — not in N (Neutral). And, if you leave the vehicle with the engine running, it could overheat and even catch fire. You or others could be injured. Do not leave the vehicle with the engine running unless you have to.

If you have to leave the vehicle with the engine running, be sure your vehicle is in P (Park) and the parking brake is firmly set before you leave it. After you move the shift lever into P (Park), hold the regular brake pedal down. Then, see if you can move the shift lever away from P (Park) without first pulling it toward you. If you can, it means that the shift lever was not fully locked into P (Park). Torque Lock If you are parking on a hill and you do not shift your transmission into P (Park) properly, the weight of the vehicle may put too much force on the parking pawl in the transmission. You may find it difficult to pull the shift lever out of P (Park). This is called torque lock. To prevent torque lock, set the parking brake and then shift into P (Park) properly before you leave the driver seat. To find out how, see Shifting Into Park on page 3‑51. When you are ready to drive, move the shift lever out of P (Park) before you release the parking brake. If torque lock does occur, you may need to have