2010 Chevrolet Silverado Owners Manual

. Adjust the Climate Control system to a setting

that circulates the air inside the vehicle and set the fan speed to the highest setting. See Climate Control System in the Index.

For more information about carbon monoxide, see Engine Exhaust on page 3‑54. Snow can trap exhaust gases under your vehicle. This can cause deadly CO (carbon monoxide) gas to get inside. CO could overcome you and kill you. You cannot see it or smell it, so you might not know it is in your vehicle. Clear away snow from around the base of your vehicle, especially any that is blocking the exhaust.

Run the engine for short periods only as needed to keep warm, but be careful.

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To save fuel, run the engine for only short periods as needed to warm the vehicle and then shut the engine off and close the window most of the way to save heat. Repeat this until help arrives but only when you feel really uncomfortable from the cold. Moving about to keep warm also helps. If it takes some time for help to arrive, now and then when you run the engine, push the accelerator pedal slightly so the engine runs faster than the idle speed. This keeps the battery charged to restart the vehicle and to signal for help with the headlamps. Do this as little as possible to save fuel. If Your Vehicle is Stuck in Sand, Mud, Ice, or Snow Slowly and cautiously spin the wheels to free the vehicle when stuck in sand, mud, ice, or snow. See Rocking Your Vehicle to Get It Out on page 5‑28.

If the vehicle has a traction system, it can often help to free a stuck vehicle. Refer to the vehicle's traction system in the Index. If stuck too severely for the traction system to free the vehicle, turn the traction system off and use the rocking method.

{ WARNING:

If the vehicle's tires spin at high speed, they can explode, and you or others could be injured. The vehicle can overheat, causing an engine compartment fire or other damage. Spin the wheels as little as possible and avoid going above 55 km/h (35 mph) as shown on the speedometer.

For information about using tire chains on the vehicle, see Tire Chains on page 6‑89.

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Rocking Your Vehicle to Get It Out Turn the steering wheel left and right to clear the area around the front wheels. For four-wheel-drive vehicles, shift into Four‐Wheel High. For vehicles with StabiliTrak®, turn the traction control part of the system off. Shift back and forth between R (Reverse) and a forward gear, spinning the wheels as little as possible. To prevent transmission wear, wait until the wheels stop spinning before shifting gears. Release the accelerator pedal while shifting, and press lightly on the accelerator pedal when the transmission is in gear. Slowly spinning the wheels in the forward and reverse directions causes a rocking motion that could free the vehicle. If that does not get the vehicle out after a few tries, it might need to be towed out. Recovery hooks can be used, if the vehicle has them. If the vehicle does need to be towed out, see Towing Your Vehicle on page 5‑43.

Recovery Hooks

{ WARNING:

These hooks, when used, are under a lot of force. Always pull the vehicle straight out. Never pull on the hooks at a sideways angle. The hooks could break off and you or others could be injured from the chain or cable snapping back.

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Loading the Vehicle It is very important to know how much weight your vehicle can carry. This weight is called the vehicle capacity weight and includes the weight of all occupants, cargo, and all nonfactory-installed options. Two labels on your vehicle show how much weight it was designed to carry, the Tire and Loading Information label and the Certification/Tire label.

{ WARNING:

Do not load the vehicle any heavier than the Gross Vehicle Weight Rating (GVWR), or either the maximum front or rear Gross Axle Weight Rating (GAWR). If you do, parts on the vehicle can break, and it can change the way the vehicle handles. These could cause you to lose control and crash. Also, overloading can shorten the life of the vehicle.

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Notice: Never use recovery hooks to tow the vehicle. Your vehicle could be damaged and it would not be covered by warranty. For vehicles with recovery hooks at the front of the vehicle, you can use them if you are stuck off-road and need to be pulled to some place where you can continue driving.

Tire and Loading Information Label

Label Example

A vehicle specific Tire and Loading Informatio n label is attached to the center pillar (B-pillar). With the driver's door open, you will find the label attached below the door lock post (striker). The tire and loading information label shows the number of occupant seating positions (A), and the maximum vehicle capacity weight (B) in kilograms and pounds.

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The Tire and Loading Information label also shows the size of the original equipment tires (C) and the recommended cold tire inflation pressures (D). For more information on tires and inflation see Tires on page 6‑64 and Inflation - Tire Pressure on page 6‑72 . There is also important loading information on the vehicle Certification/Tire label. It tells you the Gross Vehicle Weight Rating (GVWR) and the Gross Axle Weight Rating (GAWR) for the front and rear axles. See “Certification/Tire Label” later in this section. Steps for Determining Correct Load Limit 1. Locate the statement “The combined weight of occupants and cargo should never exceed XXX kg or XXX lbs” on your vehicle's placard.

2. Determine the combined weight of the driver

and passengers that will be riding in your vehicle.

3. Subtract the combined weight of the driver and passengers from XXX kg or XXX lbs.

4. The resulting figure equals the available

amount of cargo and luggage load capacity. For example, if the “XXX” amount equals 1400 lbs and there will be five 150 lb passengers in your vehicle, the amount of available cargo and luggage load capacity is 650 lbs (1400 − 750 (5 x 150) = 650 lbs).

6.

5. Determine the combined weight of luggage and cargo being loaded on the vehicle. That weight may not safely exceed the available cargo and luggage load capacity calculated in Step 4. If your vehicle will be towing a trailer, the load from your trailer will be transferred to your vehicle. Consult this manual to determine how this reduces the available cargo and luggage load capacity of your vehicle. SeeTowing a Trailer on page 5‑49 for important information on towing a trailer, towing safety rules and trailering tips.

Example 1

Item

Description Vehicle Capacity Weight for Example 1 = Subtract Occupant Weight @ 150 lbs (68 kg) × 2 = Available Occupant and Cargo Weight =

Total

1,000 lbs (453 kg)

300 lbs (136 kg)

700 lbs (317 kg)

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Example 2

Example 3

Item

Description Vehicle Capacity Weight for Example 2 = Subtract Occupant Weight @ 150 lbs (68 kg) × 5 = Available Cargo Weight =

Total

Item

1,000 lbs (453 kg)

750 lbs (340 kg)

250 lbs (113 kg)

Description Vehicle Capacity Weight for Example 3 = Subtract Occupant Weight @ 200 lbs (91 kg) × 5 = Available Cargo Weight =

Total

1,000 lbs (453 kg)

1000 lbs (453 kg)

0 lbs (0 kg)

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Refer to your vehicle's tire and loading information label for specific information about your vehicle's capacity weight and seating positions. The combined weight of the driver, passengers, and cargo should never exceed your vehicle's capacity weight. Certification/Tire Label

the inflation pressures needed to obtain the gross weight capacity of your vehicle. This is called Gross Vehicle Weight Rating (GVWR). The GVWR includes the weight of the vehicle, all occupants, fuel, and cargo. The Certification/Tire label also tells you the maximum weights for the front and rear axles, called Gross Axle Weight Rating (GAWR). To find out the actual loads on your front and rear axles, you need to go to a weigh station and weigh your vehicle. Your dealer can help you with this. Be sure to spread out your load equally on both sides of the centerline. Never exceed the GVWR for your vehicle, or the GAWR for either the front or rear axle.

A vehicle specific Certification/Tire label is found on the rear edge of the driver's door. The label shows the size of your vehicle's original tires and

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The Certification/Tire label also contains important information about your Front Axle Reserve Capacity. See “What is front axle reserve capacity, and how do I calculate it?” under Adding a Snow Plow or Similar Equipment on page 5‑36 .

{ WARNING:

WARNING: (Continued)

the way the vehicle handles. These could cause you to lose control and crash. Also, overloading can shorten the life of the vehicle.

In the case of a sudden stop or collision, things carried in the bed of your truck could shift forward and come into the passenger area, injuring you and others. If you put things in the bed of your truck, you should make sure they are properly secured.

{ WARNING:

Do not load the vehicle any heavier than the Gross Vehicle Weight Rating (GVWR), or either the maximum front or rear Gross Axle Weight Rating (GAWR). If you do, parts on the vehicle can break, and it can change

(Continued)

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Notice : Overloading the vehicle may cause damage. Repairs would not be covered by the vehicle warranty. Do not overload the vehicle. Using heavier suspension components to get added durability might not change your weight ratings. Ask your dealer to help you load your vehicle the right way. If you put things inside your vehicle — like suitcases, tools, packages, or anything else — they go as fast as the vehicle goes. If you have to stop or turn quickly, or if there is a crash, they will keep going.

{ WARNING:

Things you put inside your vehicle can strike and injure people in a sudden stop or turn, or in a crash. . Put things in the cargo area of your

vehicle. Try to spread the weight evenly.

. Never stack heavier things, like

suitcases, inside the vehicle so that some of them are above the tops of the seats. . Do not leave an unsecured child restraint

in your vehicle.

. When you carry something inside the vehicle, secure it whenever you can.

. Do not leave a seat folded down unless

you need to.

There is also important loading information for off-road driving in this manual. See “Loading Your Vehicle for Off-Road Driving“ under Off-Road Driving on page 5‑11 .

Two-Tiered Loading Depending on the model of your pick‐up, you can create an upper load platform by positioning two or four 2 inches (5 cm) by 6 inches (15 cm) wooden planks across the width of the pickup box. The planks must be inserted in the pickup box depressions. The length of the planks must allow for at least a 3/4 inch (2 cm) bearing surface on each end of the plank. When using this upper load platform, be sure the load is securely tied down to prevent it from shifting. The load's center of gravity should be positioned in a zone over the rear axle. The zone is located in the area between the front of each wheel well and the rear of each wheel well. The center of gravity height must not extend above the top of the pickup box flareboard. Any load that extends beyond the vehicle's taillamp area must be properly marked according to local laws and regulations. Remember not to exceed the Gross Axle Weight Rating (GAWR) of the front or rear axle.

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Add-On Equipment When you carry removable items, you may need to put a limit on how many people you carry inside your vehicle. Be sure to weigh your vehicle before you buy and install the new equipment. Notice : Overloading the vehicle may cause damage. Repairs would not be covered by the vehicle warranty. Do not overload the vehicle. Remember not to exceed the Gross Axle Weight Rating (GAWR) of the front or rear axle. * Equipment Ladder Rack and Cargo Cross Toolbox and Cargo Side Boxes and Cargo

250 lbs per side (113 kg per side) * The combined weight for all rail‐mounted equipment should not exceed 1,000 lbs (454 kg).

Maximum Weight

750 lbs (340 kg)

400 lbs (181 kg)

Adding a Snow Plow or Similar Equipment Before installing a snow plow on the vehicle, here are some things you need to know: Notice: If your vehicle does not have the snow plow prep package, adding a plow can damage your vehicle, and the repairs would not be covered by warranty. Unless your vehicle was built to carry a snow plow, do not add one to your vehicle. If your vehicle has the snow plow prep package, called RPO VYU, then the payload your vehicle can carry will be reduced when a snow plow is installed. Your vehicle can be damaged if either the front or rear axle ratings or the Gross Vehicle Weight (GVW) are exceeded. Some vehicles are built with a special snow plow prep package, called RPO VYU. If your vehicle has this option, you can add a plow to it, provided certain weights, such as the weights on the vehicle's axles and the Gross Vehicle Weight (GVW), are not exceeded. The plow the vehicle can carry depends on many things, such as:

The options the vehicle came with, and the weight of those options. The weight and number of passengers you intend to carry.

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.

The snow plow manufacturer or installer can assist you in determining the amount of rear ballast required, to help make sure the snowplow/vehicle combination does not exceed the GVW rating, the front and rear axle ratings, and the front and rear weight distribution ratio. The total vehicle must not exceed the GVW rating.

Front axle reserve capacity is the difference between your the Gross Axle Weight Rating (GAWR) and the front axle weight of the vehicle with full fuel and passengers. Basically, it is the amount of weight that can be added to the front axle before reaching the front GAWR. The front axle reserve capacity for the vehicle can be found in the lower right corner of the Certification/Tire label, as shown.

The weight of items added to the vehicle, like a tool box or truck cap. The total weight of any additional cargo you intend to carry.

Say, for example, you have a 318 kg (700 lb) snow plow. The total weight of all occupants and cargo inside the cab should not exceed 135 kg (300 lb). This means that you may only be able to carry one passenger. But, even this may be too much if you have got other equipment already adding to the weight of the vehicle. Here are some guidelines for safely carrying a snow plow on the vehicle:

. Make sure the weight on the front and rear axles

does not exceed the axle rating for each. For the front axle, if more cargo or passengers must be carried, appropriate counter ballast must be installed rear of the rear axle. Counter ballast must be properly secured so it will not move during driving. Follow the snow plow manufacturer's recommendations regarding rear ballast. Rear ballast may be required to ensure a proper front and rear weight distribution ratio, even though the actual weight at the front axle may be less than the front axle rating.

United States

Canada

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For example, adding a 318 kg (700 lb) snow plow actually adds more than 318 kg (700 lbs) to the front axle. Using the formula, if the snow plow is 122 cm (4 ft) in front of the front axle and the wheel base is 305 cm (10 ft), then:

W = 318 kg (700 lb) A = 122 cm (4 ft) W.B. = 305 cm (10 ft)

(W x (A + W.B.))/W.B. = (700 x (4 + 10))/10 = 445 kg (980 lbs) So, if the front axle reserve capacity is more than 445 kg (980 lbs), you could add the snow plow without exceeding the front GAWR. You can add heavier equipment on the front of the vehicle if you compensate for it by carrying fewer passengers, less cargo, or by positioning cargo toward the rear. This has the effect of reducing the load on the front. However, the front GAWR, rear GAWR, and the Gross Vehicle Weight Rating (GVWR) must never be exceeded.

In order to calculate the amount of weight any front accessory, such as a snow plow, is adding to the front axle, use the following formula:

(W x (A + W.B.)) /W.B.= Weight the accessory is adding to the front axle. Where:

W = Weight of added accessory A = Distance that the accessory is in front of the front axle W.B. = Vehicle Wheelbase

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{ WARNING:

On some vehicles that have certain front mounted equipment, such as a snow plow, it may be possible to load the front axle to the front gross axle weight rating (GAWR) but not have enough weight on the rear axle to have proper braking performance. If your brakes can not work properly, you could have a crash. To help your brakes work properly when a snow plow is installed, always follow the snow plow manufacturer or installer's recommendation for rear ballast to ensure a proper front and rear weight distribution ratio, even though the actual front weight may be less than the front GAWR, and the total vehicle weight is less than the gross vehicle weight rating (GVWR). Maintaining a proper front and rear weight distribution ratio is necessary to provide proper braking performance.

Total vehicle reserve capacity is the difference between the GVWR and the weight of the truck with full fuel and passengers. It is the amount of weight that can be added to the vehicle before reaching the GVWR. Keep in mind that reserve capacity numbers are intended as a guide when selecting the amount of equipment or cargo the truck can carry. If unsure of the vehicle's front, rear, or total weight, go to a weigh station and weigh the vehicle. Your dealer/retailer can also help with this. The total vehicle reserve capacity for the vehicle can be found in the lower right corner of the Certification/Tire label as shown previously. See your dealer/retailer for additional advice and information about using a snow plow on the vehicle. Also, see Loading the Vehicle on page 5‑29. Emergency Roof Lamp Provisions Vehicles with the RPO VYU snow plow prep package also have an emergency roof lamp provision package, RPO TRW. Wiring for the emergency roof lamp is provided above the overhead console. See Auxiliary Roof-Mounted Lamp on page 4‑14 for switch location.

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Truck-Camper Loading Information A vehicle specific Truck‐Camper Loading information label is attached to the inside of your vehicle's glove box. This label will tell you if your vehicle can carry a slide-in camper, how much of a load your vehicle can carry, and how to correctly spread out the load. Also, it will help you match the right slide-in camper to your vehicle. When you carry a slide-in camper, the total cargo load of your vehicle is the weight of the camper, plus the following:

. Everything else added to the camper after it

left the factory

. Everything in the camper . All the people inside

The Cargo Weight Rating (CWR) is the maximum weight of the load your vehicle can carry. It does not include the weight of the people inside. But, you can figure about 150 lbs (68 kg) for each seat.

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The total cargo load must not be more than your vehicle's CWR. Refer to the Truck-Camper Loading Information label in the glove box for dimensions A and B as shown in the following illustration.

Use the rear edge of the load floor for measurement purposes. The recommended location for the cargo center of gravity is at point C for the CWR. It is the point where the mass of a body is concentrated and, if suspended at that point, would balance the front and rear.

Here is an example of proper truck and camper match:

A. Camper Center of Gravity B. Recommended Center of Gravity

Location Zone

When the truck is used to carry a slide‐in camper, the total cargo load of the truck consists of the manufacturer's camper weight figure, the weight of installed additional camper equipment not included in the manufacturer's camper weight figure, the weight of camper cargo, and the weight of passengers in the camper.

The total cargo load should not exceed the truck's cargo weight rating and the camper's center of gravity (A) should fall within the truck's recommended center of gravity zone (B) when installed. You must weigh any accessories or other equipment that you add to your vehicle. Then, subtract this extra weight from the CWR. This extra weight may shorten the center of gravity zone of your vehicle. Your dealer can help you with this. If your slide-in camper and its load weighs less than the CWR, the center of gravity zone for your vehicle may be larger. Your dealer can help you make a good vehicle-camper match and help you determine the CWR. After you have loaded your vehicle and camper, drive to a weigh station and weigh the front and rear wheels separately. This will tell you the loads on the axles. The loads on the front and rear axles should not be more than either of the Gross Axle Weight Ratings (GAWR). The total of the axle loads should not be more than the Gross Vehicle Weight Rating (GVWR).

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Open the driver's door and look at the Certification/Tire label to find out your vehicle's GAWRs and GVWR. If your vehicle has gone over the weight ratings, move or take out some things until all the weight falls below the ratings. Secure loose items to prevent weight shifts that could affect the balance of your vehicle. When the truck‐camper is loaded, drive to a scale and weigh on the front and on the rear wheels separately to determine axle loads. Individual axle loads should not exceed either of the gross axle weight ratings (GAWR). The total axle loads should not exceed your vehicle's gross vehicle weight rating (GVWR). These ratings are given on the vehicle certification label attached to the rear edge of the driver's door. See “Certification/Tire Label” under Loading the Vehicle on page 5‑29 . If weight ratings are exceeded, move or remove items to bring all weights below the ratings.

When you install and load your slide-in camper, check the manufacturer's instructions. If you want more information on curb weights, cargo weights, Cargo Weight Rating and the correct center of gravity zone for your vehicle, your dealer can help you. Just ask for a copy of “Consumer Information, Truck-Camper Loading.”

Pickup Conversion to Chassis Cab We are aware that some vehicle owners might consider having the pickup box removed and a commercial or recreational body installed. Owners should be aware that, as manufactured, there are differences between a chassis cab and a pickup with the box removed which could affect vehicle safety. The components necessary to adapt a pickup to permit its safe use with a specialized body should be installed by the body builder.

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Towing

Towing Your Vehicle To avoid damage, the disabled vehicle should be towed with all four wheels off the ground. Consult your dealer/ retailer or a professional towing service if the disabled vehicle must be towed. See Roadside Assistance Program on page 8‑7. To tow the vehicle behind another vehicle for recreational purposes, such as behind a motorhome, see “Recreational Vehicle Towing” following. Recreational Vehicle Towing If the vehicle has a two–mode hybrid engine, see the Two–mode Hybrid manual for more information. Recreational vehicle towing means towing the vehicle behind another vehicle – such as behind a motorhome. The two most common types of recreational vehicle towing are known as dinghy towing and dolly towing. Dinghy towing is towing the vehicle with all four wheels on the ground. Dolly towing is towing the vehicle with two wheels on the ground and two wheels up on a device known as a dolly.

Here are some important things to consider before recreational vehicle towing:

. What is the towing capacity of the towing vehicle?

Be sure to read the tow vehicle manufacturer's recommendations.

. What is the distance that will be travelled? Some

vehicles have restrictions on how far and how long they can tow. Is the proper towing equipment going to be used? See your dealer/retailer or trailering professional for additional advice and equipment recommendations. Is the vehicle ready to be towed? Just as preparing the vehicle for a long trip, make sure the vehicle is prepared to be towed. See Before Leaving on a Long Trip on page 5‑23.

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Dinghy Towing Two-Wheel-Drive Vehicles

Two-wheel-drive vehicles should not be towed with all four wheels on the ground. Two-wheel-drive transmissions have no provisions for internal lubrication while being towed. Four-Wheel-Drive Vehicles

Notice: If the vehicle is towed with all four wheels on the ground, the drivetrain components could be damaged. The repairs would not be covered by the vehicle warranty. Do not tow the vehicle with all four wheels on the ground.

Use the following procedure to dinghy tow a four-wheel-drive vehicle:

1. Position the vehicle being towed behind the

tow vehicle and shift the transmission to P (Park).

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2. Turn the engine off and firmly set the parking

4. Shift the transfer case to N (Neutral). See “Shifting

brake.

3. Securely attach the vehicle being towed to the tow

vehicle.

{ WARNING:

Shifting a four-wheel-drive vehicle's transfer case into N (Neutral) can cause the vehicle to roll even if the transmission is in P (Park). The driver or others could be injured. Make sure the parking brake is firmly set before the transfer case is shifted to N (Neutral).

into Neutral” under Four-Wheel Drive on page 3‑36 for the proper procedure to select the Neutral position for the vehicle.

5. Release the parking brake only after the vehicle

being towed is firmly attached to the towing vehicle.

6. Turn the ignition to LOCK/OFF and remove the

key — the steering wheel will still turn.

After towing, see “Shifting Out of Neutral” under Four-Wheel Drive on page 3‑36 for the proper procedure to take the vehicle out of the Neutral position.

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Dolly Towing Front Towing (Front Wheels Off the Ground) Two-Wheel-Drive Vehicles

Notice: If a two-wheel-drive vehicle is towed with the rear wheels on the ground, the transmission could be damaged. The repairs would not be covered by the vehicle warranty. Never tow the vehicle with the rear wheels on the ground. Two-wheel-drive vehicles should not be towed with the rear wheels on the ground. Two-wheel-drive transmissions have no provisions for internal lubrication while being towed. To dolly tow a two‐wheel‐drive vehicle, the vehicle must be towed with the rear wheels on the dolly. See “Rear Towing (Rear Wheels Off the Ground)” later in this section for more information.

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Four-Wheel-Drive Vehicles

{ WARNING:

Use the following procedure to dolly tow a four-wheel-drive vehicle from the front:

1. Attach the dolly to the tow vehicle following the

dolly manufacturer's instructions.

2. Drive the front wheels onto the dolly. 3. Shift the transmission to P (Park). 4. Firmly set the parking brake.

Shifting a four-wheel-drive vehicle's transfer case into N (Neutral) can cause the vehicle to roll even if the transmission is in P (Park). The driver or others could be injured. Make sure the parking brake is firmly set before the transfer case is shifted to N (Neutral).

5. Use an adequate clamping device designed for

towing to ensure that the front wheels are locked into the straight position.

6. Secure the vehicle to the dolly following the

manufacturer's instructions.

7. Shift the transfer case to N (Neutral). See “Shifting

into Neutral” under Four-Wheel Drive on page 3‑36 for the proper procedure to select the neutral position for the vehicle.

8. Release the parking brake only after the vehicle

being towed is firmly attached to the towing vehicle.

9. Turn the ignition to LOCK/OFF.

After towing, see “Shifting Out of Neutral” under Four-Wheel Drive on page 3‑36.

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Rear Towing (Rear Wheels Off the Ground)

Two‐Wheel‐Drive Vehicles Use the following procedure to dolly tow a two-wheel-drive vehicle from the rear:

1. Attach the dolly to the tow vehicle following the

dolly manufacturer's instructions.

2. Drive the rear wheels onto the dolly. 3. Firmly set the parking brake. See Parking Brake

on page 3‑50 .

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4. Put the transmission in P (Park). 5. Secure the vehicle to the dolly following the

manufacturer's instructions.

6. Use an adequate clamping device designed for

towing to ensure that the front wheels are locked into the straight position.

7. Turn the ignition to LOCK/OFF.

Four‐Wheel‐Drive Vehicles Use the following procedure to dolly tow a four-wheel-drive vehicle from the rear:

1. Attach the dolly to the tow vehicle following the

dolly manufacturer's instructions.

2. Drive the rear wheels onto the dolly. 3. Firmly set the parking brake. See Parking Brake

on page 3‑50 .

4. Put the transmission in P (Park). 5. Secure the vehicle to the dolly following the

manufacturer's instructions.

6. Use an adequate clamping device designed for

towing to ensure that the front wheels are locked into the straight position.

{ WARNING:

{ WARNING:

Shifting a four-wheel-drive vehicle's transfer case into N (Neutral) can cause the vehicle to roll even if the transmission is in P (Park). The driver or others could be injured. Make sure the parking brake is firmly set before the transfer case is shifted to N (Neutral).

7. Shift the transfer case to N (Neutral). See “Shifting

into Neutral” under Four-Wheel Drive on page 3‑36 for the proper procedure to select the neutral position for the vehicle. 8. Turn the ignition to LOCK/OFF.

After towing, see “Shifting Out of Neutral” under Four-Wheel Drive on page 3‑36. Towing a Trailer If the vehicle has a diesel engine, see the DURAMAX® Diesel manual for more information. If the vehicle has a two–mode hybrid engine, see the Two–mode Hybrid manual for more information. Do not tow a trailer during break‐in. See New Vehicle Break-In on page 3‑21 for more information.

The driver can lose control when pulling a trailer if the correct equipment is not used or the vehicle is not driven properly. For example, if the trailer is too heavy, the brakes may not work well or even at all. The driver and passengers could be seriously injured. The vehicle may also be damaged; the resulting repairs would not be covered by the vehicle warranty. Pull a trailer only if all the steps in this section have been followed. Ask your dealer/retailer for advice and information about towing a trailer with the vehicle.

Notice: Pulling a trailer improperly can damage the vehicle and result in costly repairs not covered by the vehicle warranty. To pull a trailer correctly, follow the advice in this section and see your dealer/retailer for important information about towing a trailer with the vehicle. To identify the trailering capacity of the vehicle, read the information in “Weight of the Trailer” that appears later in this section.

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Trailering is different than just driving the vehicle by itself. Trailering means changes in handling, acceleration, braking, durability and fuel economy. Successful, safe trailering takes correct equipment, and it has to be used properly. The following information has many time-tested, important trailering tips and safety rules. Many of these are important for your safety and that of your passengers. So please read this section carefully before pulling a trailer. Pulling A Trailer Here are some important points:

There are many different laws, including speed limit restrictions, having to do with trailering. Make sure the rig will be legal, not only where you live but also where you will be driving. A good source for this information can be state or provincial police.

. Consider using a sway control. See “Hitches” later

in this section.

. Do not tow a trailer at all during the first 500 miles

(800 km) the new vehicle is driven. The engine, axle or other parts could be damaged.

. During the first 500 miles (800 km) that a trailer is

towed, do not drive over 50 mph (80 km/h) and do not make starts at full throttle. This helps the engine and other parts of the vehicle wear in at the heavier loads.

. Vehicles can tow in D (Drive). Shift the

transmission to a lower gear if the transmission shifts too often under heavy loads and/or hilly conditions.

Important considerations that have to do with weight:

The weight of the trailer The weight of the trailer tongue The weight on the vehicle's tires

. And the weight of the trailering combination Weight of the Trailer How heavy can a trailer safely be? It depends on how the rig is used. Speed, altitude, road grades, outside temperature and how much the vehicle is used to pull a trailer are all important. It can depend on any special equipment on the vehicle, and the amount of tongue weight the vehicle can carry. See “Weight of the Trailer Tongue” later in this section for more information.

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Trailer weight rating (TWR) is calculated assuming the tow vehicle has only the driver but all required trailering equipment. Weight of additional optional equipment, passengers and cargo in the tow vehicle must be subtracted from the trailer weight rating.

Vehicle 1500 Series 2WD Regular Cab Standard Box (b)

Axle Ratio

Use the following chart to determine how much the vehicle can weigh, based upon the vehicle model and options. Weights listed apply for conventional trailers and fifth-wheel trailers unless otherwise noted.

Maximum Trailer Weight

GCWR (a)

4.3L V6 (c) 4.3L V6 (c) 4.8L V8 (c) 4.8L V8
5.3L LMG V8
5.3L LMG V8, K5L HD Cooling Pkg 5.3L LMG V8 K5L HD Cooling Pkg

1500 Series 2WD Extended Cab Standard Box (b)

4.3L V6 (c) 4.8L V8 (c) 4.8L V8
5.3L V8
5.3L V8 K5L HD Cooling Pkg 5.3L V8 K5L HD Cooling Pkg — Fifth-Wheel Trailer 5.3L V8 K5L HD Cooling Pkg — Conventional Trailer

3.23
3.73
3.23
3.73
3.08
3.08
3.42

3.23
3.23
3.73
3.08
3.08

3.42

3.42

4,800 lbs (2 177 kg) 5,400 lbs (2 449 kg) 4,700 lbs (2 132 kg) 7,200 lbs (3 266 kg) 6,600 lbs (2 994 kg) 7,400 lbs (3 357 kg) 9,100 lbs (4 128 kg)

4,400 lbs (1 996 kg) 4,700 lbs (2 132 kg) 6,700 lbs (3 039 kg) 6,200 lbs (2 812 kg) 6,900 lbs (3 130 kg)

9,500 lbs (4 309 kg) 10,000 lbs (4 536 kg) 9,500 lbs (4 309 kg) 12,000 lbs (5 443 kg) 11,500 lbs (5 216 kg) 12,200 lbs (5 534 kg) 14,000 lbs (6 350 kg)

9,500 lbs (4 309 kg) 10,000 lbs (4 536 kg) 12,000 lbs (5 443 kg) 11,500 lbs (5 216 kg) 12,200 lbs (5 534 kg)

9,200 lbs (4 173 kg)

15,000 lbs (6 804 kg)

9,700 lbs (4 400 kg)

15,000 lbs (6 804 kg)

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Vehicle

Axle Ratio

Maximum Trailer Weight

GCWR (a)

6.2L V8
6.2L V8 K5L HD Cooling Pkg — Fifth-Wheel Trailer 6.2L V8 K5L HD Cooling Pkg — Conventional Trailer 6.2L V8 NHT Max Trailering Pkg — Fifth-Wheel Trailer 6.2L V8 NHT Max Trailering Pkg — Conventional Trailer

1500 Series 2WD Crew Cab Short Box (c)

4.8L V8
4.8L V8
5.3L V8 (LMG) 5.3L V8 (LMG) K5L HD Cooling Pkg 5.3L V8 K5L HD Cooling Pkg (XFE) 5.3L V8 K5L HD Cooling Pkg 6.2L V8
6.2L V8 K5L HD Cooling Pkg 6.2L V8 NHT Max Trailering Pkg

1500 Series 2WD Regular Cab Long Box (b)

4.3L V6 (c) 4.3L V6 (c)

5-52

3.42

3.42

3.42

3.73

3.73

3.23
3.73
3.08
3.08
3.08
3.42
3.42
3.42
3.73

3.23
3.73

6,700 lbs (3 039 kg)

12,000 lbs (5 443 kg)

9,300 lbs (4 218 kg)

15,000 lbs (6 804 kg)

9,700 lbs (4 400 kg)

15,000 lbs (6 804 kg)

10,200 lbs (4 627 kg)

16,000 lbs (7 257 kg)

10,700 lbs (4 853 kg)

16,000 lbs (7 257 kg)

4,700 lbs (2 132 kg) 6,700 lbs (3 039 kg) 6,100 lbs (2 767 kg) 6,800 lbs (3 084 kg) 7,000 lbs (3 175 kg) 9,600 lbs (4 355 kg) 6,600 lbs (2 994 kg) 9,600 lbs (4 355 kg) 10,600 lbs (4 808 kg)

10,000 lbs (4 536 kg) 12,000 lbs (5 443 kg) 11,500 lbs (5 216 kg) 12,200 lbs (5 534 kg) 12,200 lbs (5 534 kg) 15,000 lbs (6 804 kg) 12,000 lbs (5 443 kg) 15,000 lbs (6 804 kg) 16,000 lbs (7 257 kg)

4,700 lbs (2 132 kg) 5,200 lbs (2 359 kg)

9,500 lbs (4 309 kg) 10,000 lbs (4 536 kg)

Vehicle

Axle Ratio

Maximum Trailer Weight

GCWR (a)

4.8L V8 (c) 4.8L V8
5.3L V8
5.3L V8 K5L HD Cooling Pkg 5.3L V8 6 Speed Automatic 5.3L V8 K5L HD Cooling Pkg — Fifth-Wheel Trailer 5.3L V8 K5L HD Cooling Pkg — Conventional Trailer

1500 Series 2WD Extended Cab Long Box (b)

5.3L V8
5.3L V8 K5L HD Cooling Pkg 5.3L V8 K5L HD Cooling Pkg — Fifth-Wheel Trailer 5.3L V8 K5L HD Cooling Pkg — Conventional Trailer

1500 Series 4WD Regular Cab Standard Box (b)

4.3L V6 (c) 4.8L V8 (c) 5.3L V8 — Fifth-Wheel Trailer 5.3L V8 — Conventional Trailer 5.3L V8 K5L HD Cooling Pkg

3.23
3.73
3.08
3.08
3.42

3.42

3.42

3.08
3.08

3.42

3.42

3.73
3.42
3.08
3.08
3.08

5,100 lbs (2 313 kg) 7,100 lbs (3 221 kg) 6,500 lbs (2 948 kg) 7,200 lbs (3 266 kg) 6,500 lbs (2 948 kg)

10,000 lbs (4 536 kg) 12,000 lbs (5 443 kg) 11,500 lbs (5 216 kg) 12,200 lbs (5 534 kg) 11,500 lbs (5 216 kg)

8,800 lbs (3 992 kg)

15,000 lbs (6 804 kg)

10,000 lbs (4 536 kg)

15,000 lbs (6 804 kg)

6,000 lbs (2 722 kg) 6,700 lbs (3 039 kg)

11,500 lbs (5 216 kg) 12,200 lbs (5 534 kg)

8,900 lbs (4 037 kg)

15,000 lbs (6 804 kg)

9,500 lbs (4 309 kg)

15,000 lbs (6 804 kg)

5,100 lbs (2 313 kg) 6,000 lbs (2 722 kg) 6,400 lbs (2 903 kg) 6,400 lbs (2 903 kg) 7,100 lbs (3 221 kg)

10,000 lbs (4 536 kg) 11,000 lbs (4 990 kg) 11,500 lbs (5 216 kg) 11,500 lbs (5 216 kg) 12,200 lbs (5 534 kg)

5-53

Vehicle

Axle Ratio

Maximum Trailer Weight

GCWR (a)

5.3L V8 K5L HD Cooling Pkg — Fifth-Wheel Trailer 5.3L V8 K5L HD Cooling Pkg — Conventional Trailer

1500 Series 4WD Extended Cab Standard Box (b)

4.8L V8 (c) 5.3L V8 — Fifth-Wheel Trailer 5.3L V8 — Conventional Trailer 5.3L V8 K5L HD Cooling Pkg 5.3L V8 K5L HD Cooling Pkg 6.2L V8 (c) 6.2L V8 K5L HD Cooling Pkg — Fifth-Wheel Trailer 6.2L V8 K5L HD Cooling Pkg — Conventional Trailer 6.2L V8 NHT Max Trailering Pkg — Fifth-Wheel Trailer 6.2L V8 NHT Max Trailering Pkg — Conventional Trailer

1500 Series 4WD Crew Cab Short Box (c)

4.8L V8
5.3L V8
5.3L V8 K5L HD Cooling Pkg

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3.42

3.42

3.42
3.08
3.08
3.08
3.42
3.42

3.42

3.42

3.73

3.73

3.42
3.08
3.08

8,100 lbs (3 674 kg)

14,000 lbs (6 350 kg)

8,900 lbs (4 037 kg)

14,000 lbs (6 350 kg)

5,500 lbs (2 495 kg) 6,100 lbs (2 767 kg) 6,100 lbs (2 767 kg) 6,800 lbs (3 084 kg) 9,600 lbs (4 354 kg) 6,400 lbs (2 903 kg)

11,000 lbs (4 990 kg) 11,500 lbs (5 216 kg) 11,500 lbs (5 216 kg) 12,200 lbs (5 534 kg) 15,000 lbs (6 804 kg) 12,000 lbs (5 443 kg)

8,900 lbs (4 037 kg)

15,000 lbs (6 804 kg)

9,400 lbs (4 264 kg)

15,000 lbs (6 804 kg)

9,900 lbs (4 491 kg)

16,000 lbs (7 257 kg)

10,400 lbs (4 717 kg)

16,000 lbs (7 257 kg)

5,500 lbs (2 495 kg) 6,000 lbs (2 722 kg) 6,700 lbs (3 039 kg)

11,000 lbs (4 990 kg) 11,500 lbs (5 216 kg) 12,200 lbs (5 534 kg)

Vehicle

Axle Ratio

Maximum Trailer Weight

GCWR (a)

5.3L V8 K5L HD Cooling Pkg 6.2L V8
6.2L V8 K5L HD Cooling Pkg 6.2L V8 NHT Max Trailering Pkg — Conventional Trailer

1500 Series 4WD Regular Cab Long Box (b)

4.3L V6 (c) 4.8L V8 (c) 5.3L V8
5.3L V8 K5L HD Cooling Pkg 5.3L V8 K5L HD Cooling Pkg — Fifth-Wheel Trailer 5.3L V8 K5L HD Cooling Pkg — Conventional Trailer

1500 Series 4WD Extended Cab Long Box (b)

5.3L V8 (c) 5.3L V8 K5L HD Cooling Pkg 5.3L V8 K5L HD Cooling Pkg — Fifth-Wheel Trailer 5.3L V8 K5L HD Cooling Pkg — Conventional Trailer

3.42
3.42
3.42

3.73

3.73
3.42
3.08
3.08

3.42

3.42

3.08
3.08

3.42

3.42

9,500 lbs (4 309 kg) 6,400 lbs (2 903 kg) 9,400 lbs (4 264 kg)

15,000 lbs (6 804 kg) 12,000 lbs (5 443 kg) 15,000 lbs (6 804 kg)

10,400 lbs (4 717 kg)

16,000 lbs (7 257 kg)

5,000 lbs (2 268 kg) 5,800 lbs (2 631 kg) 6,300 lbs (2 858 kg) 7,000 lbs (3 175 kg)

10,000 lbs (4 536 kg) 11,000 lbs (4 990 kg) 11,500 lbs (5 216 kg) 12,200 lbs (5 534 kg)

9,700 lbs (4 400 kg)

15,000 lbs (6 804 kg)

9,800 lbs (4 445 kg)

15,000 lbs (6 804 kg)

5,800 lbs (2 631 kg) 6,500 lbs (2 948 kg)

11,500 lbs (5 216 kg) 12,200 lbs (5 534 kg)

8,000 lbs (3 629 kg)

15,000 lbs (6 804 kg)

9,300 lbs (4 218 kg)

15,000 lbs (6 804 kg)

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Vehicle 2500 Series 2WD Extended Cab Standard Box HD (d) 3.73
4.10

6.0L V8

Axle Ratio

2500 Series 2WD Crew Cab Standard Box HD (d)

6.0L V8

2500 Series 2WD Regular Cab Long Box HD (d)

6.0L V8

2500 Series 2WD Extended Cab Long Box HD (d)

6.0L V8

2500 Series 2WD Crew Cab Long Box HD (d)

3.73
4.10

3.73
4.10

3.73
4.10

6.0L V8

3.73
4.10
2500 Series 4WD Extended Cab Standard Box HD (d) 3.73
4.10

6.0L V8

Maximum Trailer Weight

GCWR (a)

10,200 lbs (4 627 kg) 12,700 lbs (5 761 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

10,000 lbs (4 536 kg) 12,500 lbs (5 670 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

10,500 lbs (4 763 kg) 13,000 lbs (5 897 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

10,000 lbs (4 536 kg) 12,500 lbs (5 670 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

9,900 lbs (4 491 kg) 12,400 lbs (5 625 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

9,900 lbs (4 491 kg) 12,400 lbs (5 625 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

2500 Series 4WD Crew Cab Standard Box HD (d)

6.0L V8

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3.73
4.10

9,800 lbs (4 445 kg) 12,300 lbs (5 579 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

Vehicle 2500 Series 4WD Regular Cab Long Box HD (d)

Axle Ratio

Maximum Trailer Weight

GCWR (a)

6.0L V8

2500 Series 4WD Extended Cab Long Box HD (d)

6.0L V8

2500 Series 4WD Crew Cab Long Box HD (d)

6.0L V8

3500 Series 2WD Extended Cab (e)

6.0L V8 (Single Rear Wheels)

6.0L V8 (Dual Rear Wheels)

3500 Series 2WD Crew Cab (e)

6.0L V8 (Single Rear Wheels)

6.0L V8 (Dual Rear Wheels)

3.73
4.10

3.73
4.10

3.73
4.10

3.73
4.10
3.73
4.10

3.73
4.10
3.73
4.10

10,200 lbs (4 627 kg) 12,700 lbs (5 761 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

9,800 lbs (4 445 kg) 12,300 lbs (5 579 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

9,600 lbs (4 355 kg) 12,100 lbs (5 489 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

9,900 lbs (4 491 kg) 12,400 lbs (5 625 kg) 9,500 lbs (4 309 kg) 12,000 lbs (5 443 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg) 16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

9,700 lbs (4 400 kg) 12,200 lbs (5 534 kg) 9,300 lbs (4 218 kg) 11,800 lbs (5 352 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg) 16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

5-57

Vehicle 3500 Series 4WD Regular Cab (e)

6.0L V8 (Single Rear Wheels)

6.0L V8 (Dual Rear Wheels)

3500 Series 4WD Extended Cab (e)

6.0L V8 (Single Rear Wheels)

6.0L V8 (Dual Rear Wheels)

3500 Series 4WD Crew Cab (e)

Axle Ratio

Maximum Trailer Weight

GCWR (a)

3.73
4.10
3.73
4.10

3.73
4.10
3.73
4.10

10,000 lbs (4 536 kg) 12,500 lbs (5 670 kg) 9,700 lbs (4 400 kg) 12,200 lbs (5 534 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg) 16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

9,600 lbs (4 355 kg) 12,100 lbs (5 489 kg) 9,200 lbs (4 173 kg) 11,700 lbs (5 307 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg) 16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg)

3.73
4.10
3.73
4.10

6.0L V8 (Dual Rear Wheels)

6.0L V8 (Single Rear Wheels)

9,400 lbs (4 264 kg) 11,900 lbs (5 398 kg) 9,100 lbs (4 128 kg) 11,600 lbs (5 262 kg)

16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg) 16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg) (a) The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo, equipment and conversions. The GCWR for the vehicle should not be exceeded. (b) Fifth-wheel or gooseneck kingpin weight 15 percent to 25 percent of trailer weight up to 1,500 lbs (680 kg) maximum. (c) This model is neither designed nor intended to tow fifth-wheel or gooseneck trailers. (d) Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 3,000 lbs (1 361 kg) maximum. (e) Fifth-wheel or gooseneck kingpin weight should be 15 percent to 25 percent of trailer weight up to 3,500 lbs (1 587 kg) maximum.

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Ask your dealer/retailer for trailering information or advice, or write us at our Customer Assistance Offices. See Customer Assistance Offices on page 8‑6 for more information. Weight of the Trailer Tongue The tongue load (A) of any trailer is very important because it is also part of the vehicle weight. The Gross Vehicle Weight (GVW) includes the curb weight of the vehicle, any cargo carried in it, and the people who will be riding in the vehicle as well as trailer tongue weight. Vehicle options, equipment, passengers and cargo in the vehicle reduce the amount of tongue weight the vehicle can carry, which will also reduce the trailer weight the vehicle can tow. See “Loading the Vehicle” for more information about the vehicle's maximum load capacity.

Trailer tongue weight (A) should be 10 percent to 15 percent and fifth wheel or gooseneck kingpin weight should be 15 to 25 percent of the loaded trailer weight up to the maximums for vehicle series and hitch type shown below:

Maximum

Vehicle Series 1500
2500HD/3500
1500
2500HD/3500

1500

Hitch Type

Weight Carrying Weight Carrying

Tongue Weight 272 kg (600 lbs) 453 kg (1,000 lbs) Weight Distributing 499 kg (1,100 lbs) Weight Distributing 680 kg (1,500 lbs)

Fifth Wheel Gooseneck

680 kg (1,500 lbs)

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Total Weight on the Vehicle's Tires Be sure the vehicle's tires are inflated to the inflation pressures found on the Certification label on the drivers door or see Loading the Vehicle on page 5‑29 for more information. Make sure not to exceed the GVWR limit for the vehicle, or the RGAWR, with the tow vehicle and trailer fully loaded for the trip including the weight of the trailer tongue. If using a weight distributing hitch, make sure not to exceed the RGAWR before applying the weight distribution spring bars. Weight of the Trailering Combination It is important that the combination of the tow vehicle and trailer does not exceed any of its weight ratings — GCWR, GVWR, RGAWR, Trailer Weight Rating or Tongue Weight. The only way to be sure it is not exceeding any of these ratings is to weigh the tow vehicle and trailer combination, fully loaded for the trip, getting individual weights for each of these items.

Vehicle Series

2500HD

3500 Single Rear Wheels 3500 Dual Rear Wheels

Hitch Type Fifth Wheel Gooseneck Fifth Wheel Gooseneck Fifth Wheel Gooseneck

Maximum

Tongue Weight

1 134 kg (2,500 lbs) 1 360 kg (3,000 lbs) 1 587 kg (3,500 lbs)

Do not exceed the maximum allowable tongue weight for the vehicle. Choose the shortest hitch extension that will position the hitch ball closest to the vehicle. This will help reduce the effect of trailer tongue weight on the rear axle. Trailering may be limited by the vehicle's ability to carry tongue weight. Tongue or kingpin weight cannot cause the vehicle to exceed the GVWR (Gross Vehicle Weight Rating) or the RGAWR (Rear Gross Axle Weight Rating). See “Total Weight on the Vehicle's Tires” later in this section for more information. After loading the trailer, weigh the trailer and then the tongue, separately, to see if the weights are proper. If they are not, adjustments might be made by moving some items around in the trailer.

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Hitches The correct hitch equipment helps maintain combination control. Most small-to-medium trailers can be towed with a weight carrying hitch which simply features a coupler latched to the hitch ball. Larger trailers may require a weight distributing hitch that uses spring bars to distribute the trailer tongue weight among the two vehicle and trailer axles. Fifth wheel and gooseneck hitches may also be used. See “Weight of the Trailer Tongue” earlier in this section for rating limits with various hitch types. If a step-bumper hitch will be used, the bumper could be damaged in sharp turns. Make sure there is ample room when turning to avoid contact between the trailer and the bumper. Consider using sway controls with any trailer. Ask a trailering professional about sway controls or refer to the trailer manufacturer's recommendations and instructions.

Weight‐Distributing Hitch Adjustment

A : Body to Ground Distance B : Front of Vehicle When using a weight-distributing hitch, the spring bars should be adjusted so the distance (A) is the same after coupling the trailer to the tow vehicle and adjusting the hitch.

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Safety Chains Always attach chains between the vehicle and the trailer. Cross the safety chains under the tongue of the trailer to help prevent the tongue from contacting the road if it becomes separated from the hitch. Instructions about safety chains may be provided by the hitch manufacturer or by the trailer manufacturer. If the trailer being towed weighs up to 5,000 lbs (2 271 kg) with a factory-installed step bumper, safety chains may be attached to the attaching points on the bumper, otherwise, safety chains should be attached to holes on the trailer hitch platform. Always leave just enough slack so the combination can turn. Never allow safety chains to drag on the ground. Tow/Haul Mode

Pressing this button at the end of the shift lever turns on and off the tow/ haul mode.

Fifth Wheel and Gooseneck Trailering Fifth wheel and gooseneck trailers can be used with many pickup models. These trailers place a larger percentage of the weight (kingpin weight) on the tow vehicle than conventional trailers. Make sure this weight does not cause the vehicle to exceed GAWR or GVWR. Fifth wheel or gooseneck kingpin weight should be 15 to 25 percent of the trailer weight up to the maximum amount specified in the trailering chart for the vehicle. See “Weight of the Trailer” in this section for more information. The hitch should be located in the pickup bed so that its centerline is over or slightly in front of the rear axle. Take care that it is not so far forward that it will contact the back of the cab in sharp turns. This is especially important for short box pickups. Trailer pin box extensions and sliding fifth wheel hitch assemblies can help this condition. There should be at least six inches of clearance between the top of the pickup box and the bottom of the trailer shelf that extends over the box. Make sure the hitch is attached to the tow vehicle frame rails. Do not use the pickup box for support.

5-62

This indicator light on the instrument panel cluster comes on when the tow/ haul mode is on.

Tow/Haul is a feature that assists when pulling a heavy trailer or a large or heavy load. See Tow/Haul Mode on page 3‑34 for more information. Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75 percent of the vehicle's Gross Combined Weight Rating (GCWR). See “Weight of the Trailer” later in the section. Tow/Haul is most useful under the following driving conditions:

. When pulling a heavy trailer or a large or heavy

load through rolling terrain.

. When pulling a heavy trailer or a large or heavy

load in stop and go traffic.

. When pulling a heavy trailer or a large or heavy

load in busy parking lots where improved low speed control of the vehicle is desired.

Operating the vehicle in Tow/Haul when lightly loaded or with no trailer at all will not cause damage. However, there is no benefit to the selection of Tow/Haul when the

vehicle is unloaded. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy. Tow/Haul is recommended only when pulling a heavy trailer or a large or heavy load. Trailer Brakes A loaded trailer that weighs more than 2,000 lbs (900 kg) needs to have its own brake system that is adequate for the weight of the trailer. Be sure to read and follow the instructions for the trailer brakes so they are installed, adjusted and maintained properly. If the vehicle is equipped with StabiliTrak®, the trailer cannot tap into the vehicle's hydraulic brake system. The trailer brake system can tap into the vehicle's hydraulic brake system only if:

The trailer parts can withstand 3,000 psi (20 650 kPa) of pressure. The trailer's brake system will use less than 0.02 cubic inch (0.3 cc) of fluid from the vehicle's master cylinder. Otherwise, both braking systems will not work well or at all.

If everything checks out this far, make the brake tap at the port on the master cylinder that sends the fluid to the rear brakes. Use only steel brake tubing to make the tap.

5-63

Integrated Trailer Brake Control System

The vehicle may have an Integrated Trailer Brake Control (ITBC) system for electric trailer brakes.

This symbol is located on the Trailer Brake Control Panel on vehicles with an Integrated Trailer Brake Control System. The power output to the trailer brakes is based on the amount of brake pressure being applied by the vehicle’s brake system. This available power output to the trailer brakes can be adjusted to a wide range of trailering situations. The ITBC system is integrated with the vehicle’s brake, anti‐lock brake and StabiliTrak (if equipped) systems. In trailering conditions that cause the vehicle’s anti‐lock brake or StabiliTrak systems to activate, power sent to the trailer's brakes will be automatically adjusted to minimize trailer wheel lock-up. This does not imply that the trailer has the StabiliTrak system.

If the vehicle’s brake, anti‐lock brake or StabiliTrak systems are not functioning properly, the ITBC system may not be fully functional or may not function at all. Make sure all of these systems are fully operational to ensure full functionality of the ITBC system. The ITBC system is powered through the vehicle's electrical system. Turning the ignition off will also turn off the ITBC system. The ITBC system is fully functional only when the ignition is in ON or in RUN. The ITBC system can only be used with trailers with electric brakes.

{ WARNING:

Connecting a trailer that is not compatible with the ITBC system may result in reduced or complete loss of trailer braking. There may be an increase in stopping distance or trailer instability which could result in personal injury or damage to the vehicle, trailer, or other property. An aftermarket controller may be available for use with trailers with surge, air or electric‐over‐hydraulic trailer brake systems. To determine the type of brakes on the trailer and the availability of controllers, check with your trailer manufacturer or dealer/ retailer.

5-64

When trailering, make sure of the following:

Trailer Brake Control Panel

The ITBC system is used only with trailers that are equipped with electric brakes.

. All applicable local and federal laws and

regulations are followed.

. All electrical and mechanical connections to the

trailer are made correctly. The trailer’s brakes are in proper working condition. The trailer and vehicle are properly loaded for the towing condition.

The ITBC system is a factory installed item. Out‐of‐factory installation of this system should not be attempted. GM is not responsible for warranty or performance of the system resulting from out‐of‐factory installation.

A. Manual Trailer Brake Apply Lever B. Trailer Gain Adjustment Buttons

The ITBC system has a control panel located on the instrument panel to the left of the steering column. See Instrument Panel (Base/Uplevel Version) on page 1‑2
or Instrument Panel (Premium Version) on page 1‑4 .

5-65

The control panel allows adjustment to the amount of output, referred to as trailer gain, available to the electric trailer brakes and allows manual application of the trailer brakes. The Trailer Brake Control Panel is used along with the Trailer Brake Display Page on the DIC to adjust and display power output to the trailer brakes. Trailer Brake DIC Display Page The ITBC system displays messages into the vehicle’s Driver Information Center (DIC). See DIC Warnings and Messages on page 4‑63 for more information. The display page indicates Trailer Gain setting, power output to the electric trailer brakes, trailer connection and system operational status. The Trailer Brake Display Page can be displayed by performing any of the following actions:

. Scrolling through the DIC menu pages using the

odometer trip stem or the DIC Vehicle Information button (if equipped).

. Pressing a Trailer Gain button – If the Trailer Brake Display Page is not currently displayed, pressing a Trailer Gain button will first recall the current Trailer Gain setting. After the Trailer Brake Display Page is displayed, each press and release of the gain buttons will then cause the Trailer Gain setting to change.

5-66

. Activating the Manual Trailer Brake Apply lever . Connecting a trailer equipped with electric trailer

brakes

All DIC warning and service messages must first be acknowledged by the driver by pressing the odometer trip stem or the DIC Vehicle Information button (if equipped) before the Trailer Brake Display Page can be displayed and Trailer Gain can be adjusted. TRAILER GAIN – This setting is displayed anytime the Trailer Brake Display Page is active. This setting can be adjusted from 0.0 to 10.0 with either a trailer connected or disconnected. To adjust the Trailer Gain, press one of the Trailer Gain adjustment buttons located on the Trailer Brake Control Panel. Press and hold a gain button to cause the Trailer Gain to continuously adjust. To turn the output to the trailer off, adjust the Trailer Gain setting to 0.0 (zero). 0.0 (zero) gain is the factory default setting. To properly adjust trailer gain, see the Trailer Gain Adjustment Procedure later in this section. TRAILER OUTPUT – This is displayed any time a trailer with electric brakes is connected. Output to the electric brakes is based on the amount of vehicle braking present and relative to the Trailer Gain setting. Output is displayed from 0 to 10 bars for each gain setting.

The Trailer Output will indicate “- - - - - -“ on the Trailer Brake Display Page whenever the following occur:

. No trailer is connected. . A trailer without electric brakes is connected (no

DIC message is displayed).

. A trailer with electric brakes has become

disconnected (a CHECK TRAILER WIRING message will also be displayed on the DIC). There is a fault present in the wiring to the electric trailer brakes (a CHECK TRAILER WIRING message will also be displayed on the DIC). There is a fault in the ITBC system (a SERVICE TRAILER BRAKE SYSTEM message will also be displayed in the DIC).

Manual Trailer Brake Apply The Manual Trailer Brake Apply Lever is located on the Trailer Brake Control Panel and is used to apply the trailer’s electric brakes independent of the vehicle’s brakes. This lever is used in the Trailer Gain Adjustment Procedure to properly adjust the power output to the trailer brakes. Sliding the lever to the left will apply only the trailer brakes. The power output to the trailer is indicated in the Trailer Brake Display Page in the DIC. If the vehicle’s service brakes are applied while using the Manual Trailer Brake Apply Lever, the trailer output power will be the greater of the two.

The trailer and the vehicle's brake lamps will come on when either vehicle braking or manual trailer brakes are applied. Trailer Gain Adjustment Procedure Trailer Gain should be set for a specific trailering condition and must be adjusted any time vehicle loading, trailer loading or road surface conditions change. Setting the Trailer Gain properly is needed for the best trailer stopping performance. A trailer that is over-gained may result in locked trailer brakes. A trailer that is under-gained may result in not enough trailer braking. Both of these conditions may result in poorer stopping and stability of the vehicle and trailer. Use the following procedure to correctly adjust Trailer Gain for each towing condition:

1. Make sure the trailer brakes are in proper working

condition.

2. Connect a properly loaded trailer to the vehicle

and make all necessary mechanical and electrical connections. See Loading the Vehicle on page 5‑29 for more information.

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3. After the electrical connection is made to a trailer

6. Adjust the Trailer Gain to just below the point of

equipped with electric brakes: . A TRAILER CONNECTED message will be

briefly displayed on the DIC display. The Trailer Brake Display Page will appear on the DIC showing TRAILER GAIN and TRAILER OUTPUT. In the Trailer Output display on the DIC, “- - - - - -“ will disappear if there is no error present. Connecting a trailer without electric brakes will not clear the six dashed lines.

4. Adjust the Trailer Gain by using the gain

adjustment (+ / -) buttons on the Trailer Brake Control Panel.

5. Drive the vehicle with the trailer attached on a level road surface representative of the towing condition and free of traffic at about 20 to 25 mph (32 to 40 km/h) and fully apply the Manual Trailer Brake Apply lever. Adjusting trailer gain at speeds lower than 20 to 25 mph (32 to 40 km/h) may result in an incorrect gain setting.

trailer wheel lock-up, indicated by trailer wheel squeal or tire smoke when a trailer wheel locks. Trailer wheel lock-up may not occur if towing a heavily loaded trailer. In this case, adjust the Trailer Gain to the highest allowable setting for the towing condition.

7. Re-adjust Trailer Gain any time vehicle loading,

trailer loading or road surface conditions change or if trailer wheel lock-up is noticed at any time while towing.

Other ITBC Related DIC Messages In addition to displaying TRAILER GAIN and TRAILER OUTPUT through the DIC, trailer connection and ITBC system status is displayed in the DIC. TRAILER CONNECTED – This message will be briefly displayed when a trailer with electric brakes is first connected to the vehicle. This message will automatically turn off in about ten seconds. The driver can also acknowledge this message before it automatically turns off.

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CHECK TRAILER WIRING – This message will be displayed if:

1. The ITBC system first determines connection to a trailer with electric brakes and then the trailer harness becomes disconnected from the vehicle. If the disconnect occurs while the vehicle is stationary, this message will automatically turn off in about thirty seconds. This message will also turn off if the driver acknowledges this message off or if the trailer harness is re-connected. If the disconnect occurs while the vehicle is moving, this message will continue until the ignition is turned off. This message will also turn off if the driver acknowledges this message off or if the trailer harness is re-connected.

2. There is an electrical fault in the wiring to the

electric trailer brakes. This message will continue as long as there is an electrical fault in the trailer wiring. This message will also turn off if the driver acknowledges this message off.

To determine if the electrical fault is on the vehicle side or trailer side of the trailer wiring harness connection, do the following:

1. Disconnect the trailer wiring harness from the

vehicle.

2. Turn the ignition OFF.

3. Wait ten seconds, then turn the ignition back

4.

to RUN. If the CHECK TRAILER WIRING message re-appears, the electrical fault is on the vehicle side. If the CHECK TRAILER WIRING message only re-appears when connecting the trailer wiring harness to the vehicle, the electrical fault is on the trailer side.

SERVICE TRAILER BRAKE SYSTEM – This message will be displayed when there is a problem with the ITBC system. If this message persists over multiple ignition cycles there is a problem with the ITBC system. Take the vehicle to an authorized GM dealer to have the ITBC system diagnosed and repaired. If either the CHECK TRAILER WIRING or SERVICE TRAILER BRAKE SYSTEM message is displayed while driving the vehicle, power is no longer available to the trailer brakes. When traffic conditions allow, carefully pull the vehicle over to the side of the road and turn the ignition off. Check the wiring connection to the trailer and turn the ignition back on. If either of these messages continues, either the vehicle or trailer needs service.

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An authorized GM dealer may be able to diagnose and repair problems with the trailer. However, any diagnosis and repair of the trailer is not covered under the vehicle warranty. Please contact your trailer dealer for assistance with trailer repairs and trailer warranty information. Driving with a Trailer

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