2008 Chevrolet Silverado Owners Manual

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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 2-24 for more information. The power sliding rear window cannot be operated manually. T: Press to open the window. S: Press to close the window. 2-17 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 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 two minutes, then will turn off to save the battery power. 2-18 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. 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: (cid:127) 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. (cid:127) 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 5-125. If the alarm does not sound or the headlamps do not ﬂash, see your dealer/retailer for service. 2-19 PASS-Key® III+ Electronic Immobilizer The PASS-Key III+ system operates on a radio frequency subject to Federal Communications Commission (FCC) Rules and with Industry Canada. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference. 2. This device must accept any interference received, including interference that may cause undesired operation. This device complies with RSS-210 of Industry Canada. Operation is subject to the following two conditions: 1. This device may not cause interference. 2. This device must accept any interference received, including interference that may cause undesired operation of the device. Changes or modiﬁcations to this system by other than an authorized service facility could void authorization to use this equipment. PASS-Key III+ uses a radio frequency transponder in the key that matches a decoder in the vehicle. 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. 2-20 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 5-125. If the engine still does not start with the other key, your vehicle needs service. 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 LOCK/OFF, and remove the key. 4. 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. 2-21 Starting and Operating Your Vehicle New Vehicle Break-In Notice: Your vehicle does not need an elaborate break-in. But it will perform better in the long run if you follow these guidelines: (cid:127) Keep your speed at 55 mph (88 km/h) or less for the ﬁrst 500 miles (805 km). (cid:127) 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. (cid:127) 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. (cid:127) Do not tow a trailer during break-in. See Towing a Trailer on page 4-55 for the trailer towing capabilities of your vehicle and more information. Following break-in, engine speed and load can be gradually increased. 2-22 Ignition Positions Use the key to turn the ignition switch to four different positions. In order to shift out of PARK (P), ignition must be in the ON/RUN or ACC/ACCESSORY and the regular brake pedal must be applied. A (LOCK/OFF): This position locks the ignition and transmission. It is a theft-deterrent feature. The key can only be removed when the ignition is turned to LOCK/OFF. Notice: Using a tool to force the key from the ignition switch could cause damage or break the key. Use the correct key and turn the key only with your hand. Make sure the key is all the way in. If it is, turn the steering wheel left and right while you turn the key hard. If none of this works, then your vehicle needs service. B (ACC/ACCESSORY): This position lets things like the radio and the windshield wipers operate while the engine is off. Lengthy operation of features such as the radio in the ACC/ACCESSORY ignition position and the ON/RUN position may drain the battery and prevent your vehicle from starting. Do not operate your vehicle in the ACC/ ACCESSORY ignition position for a long period of time. C (ON/RUN): This is the position for driving. It is the position the ignition switch returns to after the engine starts, and the key is released. The battery could be drained if you leave the key in the ACC/ACCESSORY or ON/RUN position with the engine off. You may not be able to start your vehicle if the battery is allowed to drain for an extended period of time. D (START): This position starts the engine. Key In the Ignition Never leave your vehicle with the keys inside, as it is an easy target for joy riders or thieves. If you leave the key in the ignition and park your vehicle, a chime will sound, when you open the driver’s door. Always remember to remove your key from the ignition and take it with you. This will lock your ignition and transmission. Also, always remember to lock the doors. The battery could be drained if you leave the key in the ignition while your vehicle is parked. You may not be able to start your vehicle after it has been parked for an extended period of time. 2-23 Retained Accessory Power (RAP) The following vehicle accessories can be used for up to 10 minutes after the engine is turned off: (cid:127) Audio System (cid:127) Power Windows (cid:127) OnStar® System (if equipped) (cid:127) 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’s door is opened. Starting the Engine If your vehicle has the DURAMAX® Diesel engine, see the DURAMAX® Diesel manual for more information. To place the transmission in the proper gear: Move your shift lever to PARK (P) or NEUTRAL (N). Your engine will not start in any other position -- this is a safety feature. To restart when you are already moving, use NEUTRAL (N) only. 2-24 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. Your 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. 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 a maximum of 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 your 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, your engine might not perform properly. Any resulting damage would not be covered by your vehicle’s warranty. Fast Idle System Fast Idle System with Switch If your 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 your engine idle speed whenever the following conditions are met: (cid:127) The park brake is set. (cid:127) The brake pedal is not pressed. (cid:127) The vehicle must not be moving and the accelerator must not be pressed. 2-25 To control the fast idle: (cid:127) To Enable the Fast idle, press and release the Cruise Control On/Off button and ensure that the LED is lit. (cid:127) For the preset Fast Idle, press and release the cruise set switch. This will set the preset fast idle speed. (cid:127) 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: (cid:127) Pressing the brake. (cid:127) Selecting the Cancel button. (cid:127) Releasing the Parking Brake. (cid:127) The transmission shifter is moved out of PARK (P) or NEUTRAL (N). (cid:127) Selecting the cruise control on/off button when it was previously on. 2-26 Adjustable Throttle and Brake Pedal On vehicles with this feature, you can change the position of the throttle and brake pedals. This feature is designed for shorter drivers, since the pedals cannot move farther away from the standard position, but can move toward the driver for better pedal reach. No adjustment to the pedals can be made when the vehicle is in REVERSE (R) 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. Before you start driving, fully press the brake pedal to conﬁrm the adjustment is right for you. While driving, make only small adjustments. Your vehicle may have a memory function which lets pedal settings be saved and recalled. See Memory Seat, Mirrors, and Pedals on page 1-6 for more information. Engine Coolant Heater The engine coolant heater, if available, can help in cold weather conditions at or below 0°F (−18°C) for easier starting and better fuel economy during engine warm-up. Plug in the coolant heater at least four hours before starting your vehicle. An internal thermostat in the plug-end of the cord may exist which will prevent engine coolant heater operation at temperatures above 0°F (−18°C). If your vehicle has the DURAMAX® Diesel engine, see the DURAMAX® Diesel manual for more information. To Use the Engine Coolant Heater 1. Turn off the engine. 2. Open the hood and unwrap the electrical cord. The cord is located on the driver’s side of the engine compartment, near the power steering ﬂuid reservoir. 3. Plug the cord into a normal, grounded 110-volt AC outlet. {CAUTION: 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. 2-27 Automatic Transmission Operation If your vehicle is has an automatic transmission, it has 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 How long should you keep the coolant heater plugged in? The answer depends on the outside temperature, the kind of oil you have, and some other things. Instead of trying to list everything here, we ask that you contact your dealer/retailer in the area where you will be parking your vehicle. The dealer/retailer can give you the best advice for that particular area. Active Fuel Management™ Your vehicle’s V8 engine 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 your 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 your vehicle has an Active Fuel Management™ indicator, see DIC Operation and Displays (With DIC Buttons) on page 3-57 or DIC Operation and Displays (Without DIC Buttons) on page 3-63 for more information on using this display. 2-28 Allison Transmission® or Hydra-Matic® 6-Speed Automatic Transmission See “Range Selection Mode” later in this section. PARK (P): This position locks your rear wheels. It is the best position to use when you start the engine because your 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 Park. See Torque Lock (Automatic Transmission) under Shifting Into Park on page 2-51 for more information. {CAUTION: It is dangerous to get out of your vehicle if the shift lever is not fully in PARK (P) with the parking brake ﬁrmly set. Your vehicle can roll. (Continued) CAUTION: CAUTION: (Continued) Do not leave your 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 your vehicle will not move, even when you are on fairly level ground, always set your parking brake and move the shift lever to PARK (P). See Shifting Into Park on page 2-51. If you are pulling a trailer, see Towing a Trailer on page 4-55. {CAUTION: If you have Four-Wheel Drive, your vehicle will be free to roll — even if your shift lever is in PARK (P) — if your 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 2-51. 2-29 REVERSE (R): Use this gear to back up. Notice: Shifting to REVERSE (R) while your vehicle is moving forward could damage the transmission. The repairs would not be covered by your warranty. Shift to REVERSE (R) only after your vehicle is stopped. To rock your vehicle back and forth to get out of snow, ice, or sand without damaging your transmission, see If Your Vehicle is Stuck in Sand, Mud, Ice, or Snow on page 4-34. NEUTRAL (N): In this position, your engine does not connect with the wheels. To restart when you are already moving, use NEUTRAL (N) only. Also, use NEUTRAL (N) when your vehicle is being towed. {CAUTION: Shifting into a drive gear while the engine is running at high speed is dangerous. Unless your foot is ﬁrmly on the brake pedal, your vehicle could move very rapidly. You could lose control and hit people or objects. Do not shift into a drive gear while your engine is running at high speed. 2-30 Notice: Shifting out of PARK (P) or NEUTRAL (N) with the engine running at high speed may damage the transmission. The repairs would not be covered by your warranty. Be sure the engine is not running at high speed when shifting your vehicle. DRIVE (D): This position is for normal driving. It provides the best fuel economy for your vehicle. If you need more power for passing, and you are: (cid:127) Going less than about 35 mph (55 km/h), push your accelerator pedal about halfway down. (cid:127) 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. DRIVE (D) 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 4-11. Your 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. Your vehicle’s 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. MANUAL MODE (M): 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 your vehicle has this feature, see Range Select Mode (Allison Transmission® or Hydra-Matic® 6-Speed transmission) later in this section. THIRD (3): This position is also used for normal driving. It reduces vehicle speed more than DRIVE (D) without using the brakes. You might choose THIRD (3) instead of DRIVE (D) when driving on hilly, winding roads, when towing a trailer, so there is less shifting between gears and when going down a steep hill. SECOND (2): This position reduces vehicle speed even more than THIRD (3) without using your brakes. You can use SECOND (2) on hills. It can help control your 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 SECOND (2) 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 your vehicle from a stop on slippery road surfaces. 2-31 FIRST (1): For the Hydra-Matic® 4-Speed transmission this position reduces vehicle speed even more than SECOND (2) 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 FIRST (1) 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 your 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 FIRST (1) it provides the lowest gear appropriate to your current road speed and continues to downshift as the vehicle slows, eventually downshifting to FIRST (1) 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 your warranty. If you are stuck, do not spin the tires. When stopping on a hill, use the brakes to hold the vehicle in place. 2-32 Range Selection Mode (Allison® or Hydra-Matic® 6-Speed Transmission) Your 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. To use this feature, do the following: 1. Move the shift lever to the MANUAL MODE (M). 2. Press the plus/minus buttons, located on the steering column shift lever, to select the desired range of gears for your current driving conditions. When MANUAL MODE (M) is selected a number displays next to the M, indicating the current gear. This number is the highest gear that can be used. However, your vehicle can automatically shift to lower gears as it adjusts to driving conditions. This means that all gears below that number are available. When FIFTH (5) is selected, FIRST (1) through FIFTH (5) gears are automatically shifted by the vehicle, but SIXTH (6) 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 the Range Selection Mode is active. See Tow/Haul Mode on page 2-34 While using the Range Selection mode feature, 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 your 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 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 the Range Selection system. This will limit torque to the wheels after it detects wheel slip, preventing the tires from spinning. 2-33 If your vehicle has an automatic transmission, it has a tow/haul mode. If your vehicle has an Allison or Hydra-Matic® 6-speed automatic transmission see “Tow/Haul Mode (Allison or Hydra-Matic® 6-Speed Automatic Transmission®) following. 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 3-54 for more information. Also see Tow Haul Mode under Towing a Trailer on page 4-55 for more information. Tow/Haul Mode 2-34 Tow/Haul Mode (Allison Transmission® or Hydra-Matic® 6-Speed Automatic Transmission) If your vehicle has an Allison or Hydra-Matic® 6-speed automatic transmission®, it has 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 3-54 for more information. Also see “Tow Haul Mode” under Towing a Trailer on page 4-55 for more information. 2-35 Four-Wheel Drive If your 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 part that follows before using Four-Wheel Drive. See the appropriate text for the transfer case in your 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. 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. 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 2-28 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. See the diesel supplement for information on Cruise Grade Braking. Also see Towing a Trailer on page 4-55 for more information. 2-36 Manual Transfer Case 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 3-54. Some delay between shifting and when the indicator light comes on is normal. 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. Recommended Transfer Case Settings Transfer Case Settings 2m YES Driving Conditions 4m 4n Normal Severe Extreme YES YES Vehicle in Tow* YES *See Recreational Vehicle Towing on page 4-50 Towing Your Vehicle on page 4-50 Notice: Driving on clean, dry pavement in four-wheel drive for an extended period of time can cause premature wear on your vehicle’s powertrain. Do not drive on clean, dry pavement in Four-Wheel Drive for extended periods of time. 2-37 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. When operating in Four-Wheel Low, the gear ratio provides additional torque when compared to Four-Wheel-Drive High. The transmission gear shift feel is exaggerated. 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 in Neutral. 2-38 {CAUTION: Shifting the transfer case to NEUTRAL can cause your vehicle to roll even if the transmission is in PARK (P). 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 2-50. N (NEUTRAL): Shift to this setting only when your vehicle needs to be towed. See Recreational Vehicle Towing on page 4-50 or Towing Your Vehicle on page 4-50. 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. When Using the Manual Transfer Case (cid:127) Shifting should be made using quick motions. Shifting slowly may make it more difficult to shift. (cid:127) 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. (cid:127) While in Four-Wheel High or Four-Wheel-Drive Low you may experience reduced fuel economy. (cid:127) Avoid driving in Four-Wheel Drive on clean, dry pavement. It may cause your tires to wear faster, and make the transfer case harder to shift and run noisier. (cid:127) If the transfer case shifter is in the 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 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 (cid:127) Shifts between Two-Wheel-Drive High and Four-Wheel-Drive High can be made at any vehicle speed. (cid:127) Shift the transfer case lever in one continuous motion into either the Four-Wheel-Drive High or Two-Wheel-Drive High position. (cid:127) In extremely cold weather, it may be necessary to slow or stop the vehicle to shift into Four-wheel-Drive High until your vehicle has warmed up. (cid:127) While in Four-Wheel-Drive High, your vehicle can be driven at any posted legal speed limit. 2-39 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. (cid:127) Shift the transmission into NEUTRAL (N). (cid:127) 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 will end up in NEUTRAL. This is normal, and is a function of the gear teeth aligning in your transfer case. When this happens, make sure the engine is on, shift your transmission momentarily to drive and back to NEUTRAL, and then complete the shift. (cid:127) Shift the transfer case shift lever in one continuous motion into the Four-Wheel-Drive Low position. (cid:127) When Four-Wheel-Drive Low do not drive faster than 45 mph. This will reduce wear and extend the life of your transfer case. {CAUTION: Shifting the transfer case to NEUTRAL can cause your vehicle to roll even if the transmission is in PARK (P). 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 2-50. 2-40 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 NEUTRAL (N). Shift the transfer case in one continuous motion into or out of the NEUTRAL position. 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 Transfer Case Settings 2m YES Driving Conditions 4m 4n Normal Severe Extreme YES YES Vehicle in Tow* YES *See Recreational Vehicle Towing on page 4-50 Towing Your Vehicle on page 4-50 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 your vehicle to your dealer 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. 2-41 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 your 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. StabiliTrak® will not engage in this mode. N (NEUTRAL): Shift the vehicle’s transfer case to NEUTRAL only when towing your vehicle. See Recreational Vehicle Towing on page 4-50 or Towing Your Vehicle on page 4-50 for more information. If the SERVICE 4–Wheel Drive message stays on, you should take your vehicle to your dealer for service. See “Service 4–Wheel Drive message” under DIC Warnings and Messages on page 3-66. 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. {CAUTION: Shifting the transfer case to NEUTRAL can cause your vehicle to roll even if the transmission is in PARK (P). 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 2-50. 2-42 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 RUN and the vehicle must be stopped or moving less than 3 mph (5 km/h) with the transmission in NEUTRAL (N). The preferred method for shifting into Four-Wheel-Drive Low is to have your 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 your 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 your vehicle, always wait for the mode indicator lights to stop ﬂashing before shifting the transmission into gear. It is typical for your vehicle to exhibit signiﬁcant engagement noise and bump when shifting between Four-Wheel-Drive Low and Four-Wheel-Drive High ranges or from NEUTRAL with the engine running. If the knob is turned to the Four-Wheel-Drive Low position when your 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 your vehicle is moving less than 3 mph (5 km/h) and the transmission is in NEUTRAL (N). After 30 seconds the transfer case will shift to Four-Wheel-Drive High mode. 2-43 Shifting Out of Four-Wheel-Drive Low To shift from Four-Wheel-Drive Low to Four-Wheel-Drive High, or Two-Wheel-Drive High, your vehicle must be stopped or moving less than 3 mph (5 km/h) with the transmission in NEUTRAL (N) and the ignition in ON/RUN. The preferred method for shifting out of Four-Wheel-Drive Low is to have your 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 your vehicle, always wait for the mode indicator lights to stop ﬂashing before shifting the transmission into gear. It is typical for your vehicle to exhibit signiﬁcant engagement noise and bump when shifting between Four-Wheel-Drive Low and Four-Wheel-Drive High ranges or from NEUTRAL with the engine running. If the knob is turned to the Four-Wheel-Drive High, or Two-Wheel-Drive High switch position when your 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 NEUTRAL (N). 2-44 Shifting into NEUTRAL To shift the transfer case to 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 2-50 for more information. 3. Start the vehicle or turn the ignition to ON/RUN. 4. Shift the transmission to NEUTRAL (N). 5. Shift the transfer case to Two-Wheel-Drive High. 6. Turn the transfer case dial clockwise to NEUTRAL till it stops and hold it for 10 seconds. Then slowly release the dial to the four low position. The NEUTRAL light will come on when the transfer case shift to NEUTRAL is complete. 7. If the engine is running, verify that the transfer case is in NEUTRAL (N) by shifting the transmission to REVERSE (R) for one second, then shift the transmission to DRIVE (D) for one second. 8. Turn the ignition to ACC/ACCESSORY, which will turn the engine off. 9. Place the transmission shift lever in PARK (P). 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 NEUTRAL do the following: 1. Set the parking brake and apply the regular brake pedal. 2. Shift the transmission to NEUTRAL (N) and turn the ignition to RUN with the engine off. 3. Turn the transfer case dial to Two-Wheel-Drive High. After the transfer case has shifted out of NEUTRAL the 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 your 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. Automatic Transfer Case The transfer case knob is located next to the steering column. For information on StabiliTrak®, see StabiliTrak® System on page 4-6. 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 your vehicle to your dealer 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. 2 m(Two-Wheel-Drive High): This setting is used 2-45 {CAUTION: Shifting the transfer case to NEUTRAL can cause your vehicle to roll even if the transmission is in PARK (P). 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 2-50. N (NEUTRAL): Shift the vehicle’s transfer case to NEUTRAL only when towing your vehicle. See Recreational Vehicle Towing on page 4-50 or Towing Your Vehicle on page 4-50 for more information. If the SERVICE 4–Wheel Drive message stays on, you should take your vehicle to your dealer for service. See “Service 4–Wheel Drive message” under DIC Warnings and Messages on page 3-66. 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 your 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 your 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. StabiliTrak® will not engage in this mode. See StabiliTrak® System on page 4-6 for more information. 2-46 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, and 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. 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 RUN and the vehicle must be stopped or moving less than 3 mph (5 km/h) with the transmission in NEUTRAL (N). The preferred method for shifting into Four-Wheel-Drive Low is to have your 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 your 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 your vehicle, always wait for the mode indicator lights to stop ﬂashing before shifting the transmission into gear. It is typical for your vehicle to exhibit signiﬁcant engagement noise and bump when shifting between Four-Wheel-Drive Low and Four-Wheel-Drive High ranges or from NEUTRAL with the engine running. If the knob is turned to the Four-Wheel-Drive Low position when your 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 your vehicle is moving less than 3 mph (5 km/h) and the transmission is in NEUTRAL (N). After 30 seconds the transfer case will shift to Four-Wheel-Drive High mode. 2-47 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, your vehicle must be stopped or moving less than 3 mph (5 km/h) with the transmission in NEUTRAL (N) and the ignition in RUN. The preferred method for shifting out of Four-Wheel-Drive Low is to have your 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 your 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 your vehicle, always wait for the mode indicator lights to stop ﬂashing before shifting the transmission into gear. It is typical for your vehicle to exhibit signiﬁcant engagement noise and bump when shifting between Four-Wheel-Drive Low and Four-Wheel-Drive High ranges or from 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 your 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 your vehicle is moving less than 3 mph (5 km/h) and the transmission is in NEUTRAL (N). 2-48 Shifting into NEUTRAL To shift the transfer case to 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 2-50 for more information. 3. Start the vehicle or turn the ignition to ON/RUN. 4. Put the transmission in NEUTRAL (N). 5. Shift the transfer case to Two-Wheel Drive High. 6. Turn the transfer case dial clockwise to NEUTRAL till it stops and hold it for 10 seconds. Then slowly release the dial to the four low position. The NEUTRAL light will come on when the transfer case shift to NEUTRAL is complete. 7. If the engine is running, make sure that the transfer case is in NEUTRAL (N) by shifting the transmission to REVERSE (R) for one second, then shift the transmission to DRIVE (D) for one second. 8. Turn the ignition to ACC/ACCESSORY, which will turn the engine off. 9. Place the transmission shift lever in PARK (P). 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 NEUTRAL do the following: 1. Set the parking brake and apply the regular brake pedal. 2. Shift the transmission to NEUTRAL (N) and turn the ignition to RUN with the engine off. 3. Turn the transfer case dial to Two-Wheel-Drive High, Four-Wheel-Drive High, AUTO. After the transfer case has shifted out of NEUTRAL the 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 your 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. 2-49 Parking Brake To set the parking brake, hold the regular brake pedal down with your right foot. Push down the parking brake pedal with your left foot. A chime sounds and the warning light ﬂashes when the parking brake is applied and the vehicle is moving at least 5 mph (8 km/h). If the ignition is on when the parking brake is released, the brake system warning light goes off. 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. If you are towing a trailer and are parking on any hill, see Towing a Trailer on page 4-55. To release the parking brake, hold the regular brake pedal down. Then pull the bottom edge of the lever, with the parking brake symbol and located above the parking brake pedal. 2-50 Shifting Into Park {CAUTION: It can be dangerous to get out of your vehicle if the shift lever is not fully in PARK (P) with the parking brake ﬁrmly set. Your vehicle can roll. If you have left the engine running, the vehicle can move suddenly. You or others could be injured. To be sure your vehicle will not move, even when you are on fairly level ground, use the steps that follow. With four-wheel drive, if your transfer case is in NEUTRAL, your vehicle will be free to roll, even if your shift lever is in PARK (P). CAUTION: (Continued) CAUTION: (Continued) So, be sure the transfer case is in a drive gear — not in NEUTRAL. If you are pulling a trailer, see Towing a Trailer on page 4-55. 1. Hold the brake pedal down with your right foot and set the parking brake. See Parking Brake on page 2-50 for more information. 2. Move the shift lever into the PARK (P) 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 NEUTRAL (N). 4. Turn the ignition key to LOCK/OFF. 5. Remove the key and take it with you. If you can leave your vehicle with the ignition key in your hand, your vehicle is in PARK (P). 2-51 Leaving Your Vehicle With the Engine Running {CAUTION: It can be dangerous to leave your vehicle with the engine running. Your vehicle could move suddenly if the shift lever is not fully in PARK (P) with the parking brake ﬁrmly set. If you have four-wheel drive and your transfer case is in NEUTRAL, your vehicle will be free to roll, even if your shift lever is in PARK (P). So be sure the transfer case is in a drive gear — not in 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 your vehicle with the engine running unless you have to. If you have to leave your vehicle with the engine running, be sure your vehicle is in PARK (P) and the parking brake is ﬁrmly set before you leave it. After you move the shift lever into PARK (P), hold the regular brake pedal down. Then, see if you can move the shift lever away from PARK (P) without ﬁrst pulling it toward you. If you can, it means that the shift lever was not fully locked into PARK (P). Torque Lock If you are parking on a hill and you do not shift your transmission into PARK (P) 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 PARK (P). This is called torque lock. To prevent torque lock, set the parking brake and then shift into PARK (P) properly before you leave the driver’s seat. To ﬁnd out how, see Shifting Into Park on page 2-51. When you are ready to drive, move the shift lever out of PARK (P) before you release the parking brake. If torque lock does occur, you may need to have another vehicle push yours a little uphill to take some of the pressure from the parking pawl in the transmission, then you will be able to pull the shift lever out of PARK (P). 2-52 Shifting Out of Park This vehicle is equipped with an electronic shift lock release system. The shift lock release is designed to: (cid:127) Prevent ignition key removal unless the shift lever is in PARK (P) with the shift lever button fully released, and (cid:127) Prevent movement of the shift lever out of PARK (P), unless the ignition is in ON/RUN or ACC/ACCESSORY and the regular brake pedal is applied. The shift lock release is always functional except in the case of an uncharged or low voltage (less than 9 volt) battery. If your vehicle has an uncharged battery or a battery with low voltage, try charging or jump starting the battery. See Jump Starting on page 5-47 for more information. To shift out of PARK (P) use the following: 1. Apply the brake pedal. 2. Move the shift lever to the desired position. If you still are unable to shift out of PARK (P): 1. Ease the pressure on the shift lever. 2. While holding down the brake pedal, press the shift lever all the way into PARK (P). 3. Move the shift lever to the desired position. If you are still having a problem shifting, then have your vehicle serviced soon. Parking Over Things That Burn {CAUTION: Things that can burn could touch hot exhaust parts under your vehicle and ignite. Do not park over papers, leaves, dry grass, or other things that can burn. 2-53 Running the Vehicle While Parked It is better not to park with the engine running. But if you ever have to, here are some things to know. {CAUTION: Idling the engine with the climate control system off could allow dangerous exhaust into your vehicle. See the earlier caution under Engine Exhaust on page 2-54. Also, idling in a closed-in place can let deadly carbon monoxide (CO) into your vehicle even if the climate control fan is at the highest setting. One place this can happen is a garage. Exhaust — with CO — can come in easily. NEVER park in a garage with the engine running. Also see “If You Are Caught in a Blizzard” under Winter Driving on page 4-31. Engine Exhaust {CAUTION: Engine exhaust can kill. It contains the gas carbon monoxide (CO), which you cannot see or smell. It can cause unconsciousness and death. You might have exhaust coming in if: (cid:127) The exhaust system sounds strange or different. (cid:127) Your vehicle gets rusty underneath. (cid:127) Your vehicle was damaged in a collision. (cid:127) Your vehicle was damaged when driving over high points on the road or over road debris. (cid:127) Repairs were not done correctly. (cid:127) Your vehicle or the exhaust system has been modiﬁed improperly. If you ever suspect exhaust is coming into your vehicle: (cid:127) Drive it only with all the windows down to blow out any CO. (cid:127) Have your vehicle ﬁxed immediately. 2-54 {CAUTION: {CAUTION: It can be dangerous to get out of your vehicle if the shift lever is not fully in PARK (P) with the parking brake ﬁrmly set. Your vehicle can roll. Do not leave your 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 your vehicle will not move, even when you are on fairly level ground, always set the parking brake and move the shift lever to PARK (P). Four-wheel drive vehicles with the transfer case in NEUTRAL will allow the vehicle to roll, even if the shift lever is in PARK (P). So, be sure the transfer case is in a drive gear — not in NEUTRAL. Always set the parking brake. Follow the proper steps to be sure your vehicle will not move. See Shifting Into Park on page 2-51. If you are pulling a trailer, see Towing a Trailer on page 4-55. 2-55 Mirrors Manual Rearview Mirror Adjust the mirror to see clearly behind your vehicle. Hold the mirror in the center to move it up or down and side to side. Adjust the mirror to avoid glare from the lamps behind you. Push the tab forward for daytime use and pull it for nighttime use. Automatic Dimming Rearview Mirror with OnStar®, Compass and Temperature Display Your vehicle may have this feature. When on, the automatic dimming mirror dims to the proper level to minimize glare from lights behind you after dark. The mirror has a dual display in the upper right corner of the mirror face that shows the compass reading and the outside temperature. Control buttons for the OnStar® system are at the bottom of the mirror. See OnStar® System on page 2-67 for more information about the services OnStar® provides. P(On/Off): This is the on/off button. Temperature and Compass Display Press the on/off button, located to the far left, brieﬂy to turn the compass/temperature display on or off. If the display reads CAL, the compass needs to be calibrated. For more information, see “Compass Calibration” following. To adjust between Fahrenheit and Celsius: 1. Press and hold the on/off button for approximately four seconds until either a ﬂashing F or C appears. 2. Press the button again to change the display to the desired unit of measurement. After approximately four seconds of inactivity, the new unit will be locked in and the compass/temperature display will return. If an abnormal temperature reading is displayed for an extended period of time, see your dealer/retailer. Under certain circumstances, a delay in updating the temperature is normal. Automatic Dimming Mirror Operation The automatic dimming mirror comes on each time the ignition is turned to start. To turn the automatic dimming feature off or back on, press the on/off button. The indicator light on the mirror is lit when the automatic dimming feature is on. 2-56 Compass Variance The mirror is set in zone eight upon leaving the factory. It will be necessary to adjust the compass to compensate for compass variance if the vehicle is outside of zone eight. Under certain circumstances, as during a long distance cross-country trip, it will be necessary to adjust for compass variance. Compass variance is the difference between earth’s magnetic north and true geographic north. If not adjusted to account for compass variance, the compass could give false readings. Compass Calibration The compass may need calibration if one of the following occurs: (cid:127) After approximately ﬁve seconds, the display does not show a compass heading, N for North, for example, there may be a strong magnetic ﬁeld interfering with the compass. Such interference may be caused by a magnetic antenna mount, magnetic note pad holder, or a similar magnetic item. (cid:127) The compass does not display the correct heading and the compass zone variance is set correctly. In order to calibrate, CAL must be displayed in the mirror compass windows. If CAL is not displayed, push the on/off button for approximately 12 seconds or until CAL is displayed. The compass can be calibrated by driving the vehicle in circles at 5 mph (8 km/h) or less until the display reads a direction. 2-57 To adjust for compass variance: 1. Find your current location and variance zone number on the following zone map. 2. Press and hold the on/off button until a Z and a zone number appears in the display. The compass is now in zone mode. 2-58 3. Keep pressing the on/off button until the desired zone number appears in the display. Release the button. After approximately four seconds of inactivity, the new zone number will be locked in and the compass/temperature display will return. Cleaning the Mirror When cleaning the mirror, use a paper towel or similar material dampened with glass cleaner. Do not spray glass cleaner directly on the mirror as that may cause the liquid cleaner to enter the mirror housing. Automatic Dimming Rearview Mirror with Compass and Temperature Display Your vehicle may have this mirror. When on, an automatic dimming mirror will dim to the proper level to minimize glare from lights behind you after dark. The mirror also includes a dual display in the upper right corner of the mirror with the compass reading and the outside temperature. Yb: Brieﬂy press this button to turn the display on or off. Temperature Display The temperature can be displayed by pressing the compass/temperature button. Pressing the compass/temperature button once brieﬂy, will toggle the display reading on and off. To alternate the temperature reading between Fahrenheit and Celsius, press and hold the compass/temperature button for approximately three seconds until the display blinks F and C. After approximately ﬁve seconds of inactivity, the display will stop blinking and display the last selection made. If an abnormal temperature reading is displayed for an extended period of time, see your dealer. Under certain circumstances, a delay in updating the temperature is normal. Automatic Dimming Mirror Operation OOn/Off: Press this button to turn the automatic dimming feature on or off. The indicator light to the left of the button will turn on to indicate when the feature is on. Once the mirror is turned off, it will remain off until it is turned back on, or until the vehicle is restarted. Compass Operation Press the compass/temperature button once brieﬂy to turn the display on or off. Compass Calibration See “Compass Calibration” under Automatic Dimming Rearview Mirror with OnStar®, Compass and Temperature Display on page 2-56 for more information. Compass Variance See “Compass Variance” under Automatic Dimming Rearview Mirror with OnStar®, Compass and Temperature Display on page 2-56 for more information. Cleaning the Mirror Use a paper towel or similar material dampened with glass cleaner. Do not spray glass cleaner directly on the mirror as that may cause the liquid cleaner to enter the mirror housing. Outside Manual Mirrors Adjust the outside mirrors to see the side of the vehicle and have a clear view of objects behind you. Manually fold the mirrors inward to prevent damage when going through an automatic car wash. To fold, push the mirror toward the vehicle. Push the mirror outward, to return to its original position. Using hood-mounted air deﬂectors and add-on convex mirror attachments could decrease mirror performance. 2-59 These mirrors can be manually folded forward or rearward. The lower portion of the mirror is convex. A convex mirror’s surface is curved to see more from the driver seat. The convex mirror can be adjusted manually to the driver’s preferred position for better vision. The vehicle may have outside heated mirrors which help clear them of condensation, snow, and ice. < (Rear Window Defogger): Press to turn the heated mirrors on or off. Only the upper glass of the mirror is heated. The lower convex part of the mirror is not heated. Depending on the vehicle’s features, see “Rear Window Defogger” under, Climate Control System (With Air Conditioning ) on page 3-25 or Climate Control System (Heater Only) on page 3-28 or Dual Automatic Climate Control System on page 3-29 for more information. The mirror may also have a turn signal arrow that ﬂashes in the direction of the turn or lane change. Outside Towing Mirrors If the vehicle has trailer towing type mirrors, they can be adjusted so you can have a clear view of the objects behind you. Manually pull out the mirror head to extend it for better visibility when towing a trailer. 2-60 Outside Power Mirrors If your vehicle is equipped with outside power mirrors, the controls are located on the driver’s door armrest. (cid:127) Press (A) to select the driver’s side mirror. Then press the arrows located on the four-way control pad to adjust the mirror. Press (A) again to deselect the mirror. (cid:127) Press (B) to select the passenger’s side mirror. Then press the arrows located on the four-way control pad to adjust the mirror. Press (B) again to deselect the mirror. This mirror has the following features. Manual Folding The mirrors can be manually folded inward to prevent damage when going through an automatic car wash. To fold, push the mirror toward the vehicle. To return the mirror to its original position, push outward. Be sure to return both mirrors to their original unfolded position before driving. Heated Mirrors The button to turn the heated mirrors on or off is located on the climate control panel. Press this button to warm the driver’s and passenger’s outside rearview mirrors to help clear them of ice, snow, and condensation. See “Rear Window Defogger” under Dual Automatic Climate Control System on page 3-29 for more information. 2-61 Convex Mirror The passenger’s side mirror may have convex glass. A convex mirror’s surface is curved so more can be seen from the driver’s seat. {CAUTION: A convex mirror can make things (like other vehicles) look farther away than they really are. If you cut too sharply into the right lane, you could hit a vehicle on your right. Check your inside mirror or glance over your shoulder before changing lanes. 2-62 Outside Power Foldaway Mirrors If your vehicle is equipped with outside power foldaway mirrors, the controls are located on the driver’s door armrest. (cid:127) Press (A) to select the driver’s side mirror. Then press the arrows located on the four-way control pad to adjust the mirror. Press (A) again to deselect the mirror. (cid:127) Press (B) to select the passenger’s side mirror. Then press the arrows located on the four-way control pad to adjust the mirror. Press (B) again to deselect the mirror. (cid:127) Press (C) to fold the mirrors out to the driving position. (cid:127) Press (D) to fold the mirrors in to the folded position. If the mirrors are accidentally folded/unfolded manually, they may shake or ﬂutter at normal driving speeds and may not stay in the unfolded position. If this happens, you will need to reset the mirrors. See “Resetting the Power Foldaway Mirrors” next. Resetting the Power Foldaway Mirrors You will need to reset the power foldaway mirrors if the following occurs: (cid:127) The mirrors are accidentally obstructed while folding. (cid:127) They are accidentally manually folded/unfolded. (cid:127) The mirrors will not stay in the unfolded position. (cid:127) The mirrors shake and ﬂutter at normal driving speeds. To reset the power foldaway mirrors, fold and unfold them one time using the mirror controls. This will reset them to their normal position. This mirror has the following features. Automatic Dimming The driver’s outside mirror will adjust for the glare of the headlamps behind you. See Automatic Dimming Rearview Mirror with OnStar®, Compass and Temperature Display on page 2-56. Park Tilt Mirrors If your vehicle has the memory package, the outside mirrors are able to perform the park tilt function. This feature may be useful in allowing the driver to view the curb when parallel parking. This feature will cause the passenger’s and/or driver’s mirror to tilt to a preselected position when the vehicle is in REVERSE (R). The passenger’s and/or driver’s mirror will return to its original position when the vehicle is shifted out of REVERSE (R), or the ignition is turned off or to OFF/LOCK. This feature can be turned on or off through the Driver Information Center (DIC). See DIC Vehicle Customization (With DIC Buttons) on page 3-76. Heated Mirrors The button to turn the heated mirrors on or off is located on the climate control panel. Press this button to warm the driver’s and passenger’s outside rearview mirrors to help clear them of ice, snow, and condensation. See “Rear Window Defogger” under Dual Automatic Climate Control System on page 3-29 for more information. 2-63 Convex Mirror {CAUTION: A convex mirror can make things (like other vehicles) look farther away than they really are. If you cut too sharply into the right lane, you could hit a vehicle on your right. Check your inside mirror or glance over your shoulder before changing lanes. The passenger’s side mirror may have convex glass. A convex mirror’s surface is curved so more can be seen from the driver’s seat. Your vehicle may also have a turn signal indicator on the mirror. An arrow on the mirror will ﬂash in the direction of the turn or lane change. Object Detection Systems Ultrasonic Rear Parking Assist (URPA) For vehicles with the Ultrasonic Rear Parking Assist (URPA) system, it operates at speeds less than 5 mph (8 km/h), and assists the driver with parking and avoiding objects while in R (Reverse). The sensors on the rear bumper are used to detect the distance to an object up to 8 feet (2.5 m) behind the vehicle, and at least 10 inches (25.4 cm) off the ground. 2-64 {CAUTION: The Ultrasonic Rear Parking Assist (URPA) system does not replace driver vision. It cannot detect: (cid:127) objects that are below the bumper, underneath the vehicle, or if they are too close or far from the vehicle (cid:127) children, pedestrians, bicyclists, or pets. The display is located near the passenger side rear window and can be seen by looking over your right shoulder. If you do not use proper care before and while backing; vehicle damage, injury, or death could occur. Even with URPA, always check behind your vehicle before backing up. While backing, be sure to look for objects and check your vehicle’s mirrors. URPA uses three color-coded lights to provide distance and system information. How the System Works URPA comes on automatically when the shift lever is moved into R (Reverse). The rear display brieﬂy illuminates to indicate the system is working. URPA operates only at speeds less than 5 mph (8 km/h). If the vehicle is above this speed, the red light on the rear display will ﬂash. 2-65 To be detected, objects must be at least 10 inches (25.4 cm) off the ground and below tailgate level. Objects must also be within 8 feet (2.5 m) from the rear bumper. This distance may be less during warmer or humid weather. A single beep will sound the ﬁrst time an object is detected between 20 inches (0.5 m) and 8 feet (2.5 m) away. Beeping will occur for a short time when the vehicle is closer than 1 foot (0.3 m) from the object. The following describes what will occur with the URPA display as the vehicle gets closer to a detected object: Description amber light amber/amber lights amber/amber/red lights amber/amber/red lights ﬂashing and beep for three seconds English 8 ft 40 in 23 in 1 ft Metric 2.5 m 1.0 m 0.6 m 0.3 m The system can be disabled by pressing the rear park aid disable button located next to the radio. The indicator light will come on and PARKING ASSIST OFF displays on the Driver Information Center (DIC) to indicate that URPA is off, see DIC Warnings and Messages on page 3-66 for information about clearing the message. Notice: lowered, it may not detect an object behind your vehicle, and you might back into the object and damage your vehicle. Always verify the tailgate is closed when using URPA or turn off URPA when driving with the tailgate lowered. If you use URPA while the tailgate is 2-66 When the System Does Not Seem to Work Properly If the URPA system will not activate due to a temporary condition, the message PARKING ASSIST OFF will be displayed on the DIC and a red light will be shown on the rear URPA display when the shift lever is moved into R (Reverse). This occurs under the following conditions: (cid:127) The driver disables the system. (cid:127) The parking brake pedal is depressed. (cid:127) The ultrasonic sensors are not clean. Keep the vehicle’s rear bumper free of mud, dirt, snow, ice and slush. For cleaning instructions, see Washing Your Vehicle on page 5-118. (cid:127) A trailer was attached to the vehicle, or a bicycle or an object was hanging out of the tailgate during the last drive cycle, the red light may illuminate in the rear display. Once the attached object is removed, URPA will return to normal operation. (cid:127) A tow bar is attached to the vehicle. (cid:127) The vehicle’s bumper is damaged. Take the vehicle to your dealer/retailer to repair the system. (cid:127) Other conditions may affect system performance, such as vibrations from a jackhammer or the compression of air brakes on a very large truck. OnStar® System OnStar uses several innovative technologies and live advisors to provide you with a wide range of safety, security, information, and convenience services. If your airbags deploy, the system is designed to make an automatic call to OnStar Emergency advisors who can request emergency services be sent to your location. If you lock your keys in the vehicle, call OnStar at 1-888-4-ONSTAR and they can send a signal to unlock your doors. If you need roadside assistance, press the OnStar button and they can contact Roadside Service for you. OnStar service is provided to you subject to the OnStar Terms and Conditions. You may cancel your OnStar service at any time by contacting OnStar. If the system is still disabled, after driving forward at least 15 mph (25 km/h), take the vehicle to your dealer/retailer. 2-67 A complete OnStar Owner’s Guide and the OnStar Terms and Conditions are included in the vehicle’s OnStar Subscriber glove box literature. For more information, visit onstar.com or onstar.ca, contact OnStar at 1-888-4-ONSTAR (1-888-466-7827) or TTY 1-877-248-2080, or press the OnStar button to speak with an OnStar advisor 24 hours a day, 7 days a week. Not all OnStar features are available on all vehicles. To check if your vehicle is equipped to provide the services described below, or for a full description of OnStar services and system limitations, see the OnStar Owner’s Guide in your glove box or visit onstar.com. OnStar Services For new vehicles with OnStar, the Safe & Sound Plan, or the Directions & Connections Plan is included for one year from the date of purchase. You can extend this plan beyond the ﬁrst year, or upgrade to the Directions & Connections Plan. For more information, press the OnStar button to speak with an advisor. Some OnStar services (such as Remote Door Unlock or Stolen Vehicle Location Assistance) may not be available until you register with OnStar. Available Services with Safe & Sound Plan (cid:127) Automatic Notiﬁcation of Airbag Deployment (cid:127) Advanced Automatic Crash Notiﬁcation (AACN) (If equipped) (cid:127) Link to Emergency Services (cid:127) Roadside Assistance (cid:127) Stolen Vehicle Location Assistance (cid:127) AccidentAssist (cid:127) Remote Door Unlock/Vehicle Alert (cid:127) OnStar Vehicle Diagnostics (cid:127) GM Goodwrench On Demand Diagnostics (cid:127) OnStar Hands-Free Calling with 30 complimentary minutes (cid:127) OnStar Virtual Advisor (U.S. Only) 2-68 Available Services included with Directions & Connections Plan (cid:127) All Safe and Sound Plan Services (cid:127) Driving Directions - Advisor delivered or OnStar Turn-by-Turn Navigation (If equipped) (cid:127) RideAssist (cid:127) Information and Convenience Services OnStar Hands-Free Calling OnStar Hands-Free Calling allows eligible OnStar subscribers to make and receive calls using voice commands. Hands-Free Calling is fully integrated into the vehicle, and can be used with OnStar Pre-Paid Minute Packages. Hands-Free Calling may also be linked to a Verizon Wireless service plan in the U.S. or a Bell Mobility service plan in Canada, depending on eligibility. To ﬁnd out more, refer to the OnStar Owner’s Guide in the vehicle’s glove box, visit www.onstar.com or www.onstar.ca, or speak with an OnStar advisor by pressing the OnStar button or calling 1-888-4-ONSTAR (1-888-466-7827). OnStar Virtual Advisor OnStar Virtual Advisor is a feature of OnStar Hands-Free Calling that uses your minutes to access location-based weather, local traffic reports, and stock quotes. By pressing the phone button and giving a few simple voice commands, you can browse through the various topics. See the OnStar Owner’s Guide for more information (Only available in the continental U.S.). OnStar Steering Wheel Controls Your vehicle may have a Talk/Mute button that can be used to interact with OnStar Hands-Free Calling. See Audio Steering Wheel Controls on page 3-132 for more information. On some vehicles, you may have to hold the button for a few seconds and give the command “ONSTAR” to activate the OnStar Hands-Free Calling. On some vehicles, the mute button can be used to dial numbers into voicemail systems, or to dial phone extensions. See the OnStar Owner’s Guide for more information. 2-69 How OnStar Service Works Your vehicle’s OnStar system has the capability of recording and transmitting vehicle information. This information is automatically sent to an OnStar Call Center at the time of an OnStar button press, Emergency button press or if your airbags or AACN system deploys. The vehicle information usually includes your GPS location and, in the event of a crash, additional information regarding the accident that your vehicle has been involved in (e.g. the direction from which your vehicle was hit). When you use the Virtual Advisor feature of OnStar Hands-Free Calling, your vehicle also sends OnStar your GPS location so that we can provide you with location-based services. OnStar service cannot work unless your vehicle is in a place where OnStar has an agreement with a wireless service provider for service in that area. OnStar service also cannot work unless you are in a place where the wireless service provider OnStar has hired for that area has coverage, network capacity and reception when the service is needed, and technology that is compatible with the OnStar service. Not all services are available everywhere, particularly in remote or enclosed areas, or at all times. Location information about your vehicle is only available if the GPS satellite signals are unobstructed and available. Your vehicle must have a working electrical system (including adequate battery power) for the OnStar equipment to operate. There are other problems OnStar cannot control that may prevent OnStar from providing OnStar service to you at any particular time or place. Some examples are damage to important parts of your vehicle in an accident, hills, tall buildings, tunnels, weather or wireless phone network congestion. Your Responsibility Increase the radio volume if you cannot hear the OnStar advisor. If the light next to the OnStar buttons is red, this means that your system is not functioning properly and should be checked by your dealer/retailer. If the light appears clear (no light is appearing), your OnStar subscription has expired. You can always press the OnStar button to conﬁrm that your OnStar equipment is active. 2-70 Universal Home Remote System The Universal Home Remote System provides a way to replace up to three hand-held Radio-Frequency (RF) transmitters used to activate devices such as garage door openers, security systems, and home lighting. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference. 2. This device must accept any interference received, including interference that may cause undesired operation. This device complies with RSS-210 of Industry Canada. Operation is subject to the following two conditions: 1. This device may not cause interference. 2. This device must accept any interference received, including interference that may cause undesired operation of the device. Changes or modiﬁcations to this system by other than an authorized service facility could void authorization to use this equipment. Universal Home Remote System Operation (With Three Round LED) This vehicle may have the Universal Home Remote System. If there are three round Light Emitting Diode (LED) indicator lights above the Universal Home Remote buttons, follow the instructions below. This system provides a way to replace up to three remote control transmitters used to activate devices such as garage door openers, security systems, and home automation devices. Do not use this system with any garage door opener that does not have the stop and reverse feature. This includes any garage door opener model manufactured before April 1, 1982. 2-71 Read the instructions completely before attempting to

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2008 Chevrolet Silverado Owners Manual