2014 GMC Sierra Owners Manual

filled with DEX-COOL® engine coolant. This coolant is designed to remain in the vehicle for 5 years or 240 000 km (150,000 mi), whichever occurs first. The following explains the cooling system and how to check and add coolant when it is low. If there is a problem with engine overheating, see Engine Overheating on page 10-23.

What to Use

{ Warning

Adding only plain water or some other liquid to the cooling system can be dangerous. Plain water and other liquids, can boil before the proper coolant mixture will. The coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, the engine could get too hot but you would not get the overheat warning. The engine could catch fire and you or others could be burned. Use a 50/ 50 mixture of clean, drinkable water and DEX-COOL coolant.

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Caution (Continued)

mixture can freeze and crack engine cooling parts. The repairs would not be covered by the vehicle warranty. Use only the proper mixture of engine coolant for the cooling system. See Recommended Fluids and Lubricants on page 11-12.

Never dispose of engine coolant by putting it in the trash, or by pouring it on the ground, or into sewers, streams, or bodies of water. Have the coolant changed by an authorized service center, familiar with legal requirements regarding used coolant disposal. This will help protect the environment and your health.

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10-21

Checking Coolant The coolant surge tank is located in the engine compartment on the passenger side of the vehicle. See Engine Compartment Overview on page 10-5. The vehicle must be on a level surface when checking the coolant level. Check to see if coolant is visible in the coolant surge tank. If the coolant inside the coolant surge tank is boiling, wait until it cools down. The coolant level should be at or above the FULL COLD mark. If it is not, there may be a leak in the cooling system. If coolant is visible but the coolant level is not at or above the FULL COLD mark, see “How to Add Coolant to the Coolant Surge Tank for Gasoline Engines,” following.

Use a 50/50 mixture of clean, drinkable water and DEX-COOL coolant. If using this mixture, nothing else needs to be added. This mixture: . Gives freezing protection down

to −37°C (−34°F), outside temperature.

. Gives boiling protection up to

129°C (265°F), engine temperature.

. Protects against rust and

corrosion.

. Will not damage aluminum parts. . Helps keep the proper engine

temperature.

{ Caution

If improper coolant mixture, inhibitors, or additives are used in the vehicle cooling system, the engine could overheat and be damaged. Too much water in the

(Continued)

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Vehicle Care

Warning (Continued)

the cap when the cooling system, including the surge tank pressure cap, is hot. Wait for the cooling system and surge tank pressure cap to cool.

If no coolant is visible in the surge tank, add coolant.

Light-Duty

Heavy-Duty

Coolant Surge

Coolant Surge

Tank

Tank

Pressure Cap

Pressure Cap

{ Warning

You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine.

{ Caution

This vehicle has a specific coolant fill procedure. Failure to follow this procedure could cause the engine to overheat and be severely damaged.

{ Warning

Steam and scalding liquids from a hot cooling system can blow out and burn you badly. Never turn

(Continued)

5.3L V8 Shown, 4.3L V6, 6.0L V8,

and 6.2L V8 Similar

How to Add Coolant to the Coolant Surge Tank for Gasoline Engines If the vehicle has a diesel engine, see “Cooling System” in the Duramax diesel supplement for the proper coolant fill procedure.

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1. Remove the coolant surge tank pressure cap when the cooling system, including the coolant surge tank pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly counterclockwise about one full turn. If a hiss is heard, wait for that to stop. A hiss means there is still some pressure left.

2. Keep turning the pressure cap

slowly, and remove it.

3. Fill the coolant surge tank with the proper mixture to the FULL COLD mark.

4. With the coolant surge tank

pressure cap off, start the engine and let it run until the engine coolant temperature gauge indicates approximately 90°C (195°F).

By this time, the coolant level inside the coolant surge tank may be lower. If the level is lower, add more of the proper mixture to the coolant surge tank until the level reaches the FULL COLD mark.

5. Replace the pressure cap tightly. 6. Verify coolant level after the

engine is shut off and the coolant is cold. If necessary, repeat coolant fill procedure Steps 1–6.

{ Caution

If the pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured.

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10-23

Engine Overheating If the vehicle has the Duramax diesel engine, see the Duramax diesel supplement.

{ Caution

Running the engine without coolant may cause damage or a fire. Vehicle damage would not be covered by the vehicle warranty.

The vehicle has several indicators to warn of engine overheating. There is a coolant temperature gauge in the vehicle's instrument cluster. See Engine Coolant Temperature Gauge on page 5-16.

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Vehicle Care

In addition, there are ENGINE OVERHEATED STOP ENGINE, ENGINE OVERHEATED IDLE ENGINE, and ENGINE POWER IS REDUCED messages in the Driver Information Center (DIC). See Engine Cooling System Messages on page 5-36 and Engine Power Messages on page 5-38. If the decision is made not to lift the hood when this warning appears, get service help right away. See Roadside Assistance Program on page 13-5. If the decision is made to lift the hood, make sure the vehicle is parked on a level surface.

4.3L V6, 5.3L V8, and 6.2L V8 Engines Check to see if the engine cooling fans are running. If the engine is overheating, the fans should be running. If they are not, do not continue to run the engine and have the vehicle serviced.

If Steam is Coming from the Engine Compartment { Warning

Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming from it. Just turn it off and get everyone away from the vehicle until it cools down. Wait until there is no sign of steam or coolant before you open the hood. If you keep driving when the engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop the engine if it overheats, and get out of the vehicle until the engine is cool.

If No Steam is Coming from the Engine Compartment The ENGINE OVERHEATED STOP ENGINE or the ENGINE OVERHEATED IDLE ENGINE message, along with a low coolant condition, can indicate a serious problem. If there is an engine overheat warning, but no steam is seen or heard, the problem may not be too serious. Sometimes the engine can get a little too hot when the vehicle: . Climbs a long hill on a hot day. . Stops after high-speed driving. Idles for long periods in traffic. Tows a trailer; see Trailer Towing on page 9-77.

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If the warning continues, pull over, stop, and park the vehicle right away. If there is still no sign of steam and the vehicle is equipped with an engine driven cooling fan, push down the accelerator until the engine speed is about twice as fast as normal idle speed for at least five minutes while the vehicle is parked. If the warning is still there, turn off the engine and get everyone out of the vehicle until it cools down. If there is no sign of steam, idle the engine for five minutes while parked. If the warning is still displayed, turn off the engine until it cools down.

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10-25

Overheated Engine Protection Operating Mode (6.0L V8 Engine Only) If an overheated engine condition exists and the ENGINE POWER IS REDUCED message displays, an overheat protection mode which alternates firing groups of cylinders helps to prevent engine damage. In this mode, a loss in power and engine performance will be noticed. This operating mode allows the vehicle to be driven to a safe place in an emergency. Driving extended distances and/or towing a trailer in the overheat protection mode should be avoided.

If the ENGINE OVERHEATED STOP ENGINE or the ENGINE OVERHEATED IDLE ENGINE message appears with no sign of steam, try this for a minute or so: 1. Turn the air conditioning off. 2. Turn the heater on to the highest

temperature and to the highest fan speed. Open the windows as necessary.

3. When it is safe to do so, pull off

the road, shift to P (Park) or N (Neutral) and let the engine idle.

If the temperature overheat gauge is no longer in the overheat zone or an overheat warning no longer displays, the vehicle can be driven. Continue to drive the vehicle slowly for about 10 minutes. Keep a safe vehicle distance from the vehicle in front. If the warning does not come back on, continue to drive normally and have the cooling system checked for proper fill and function.

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Vehicle Care

{ Caution

After driving in the overheated engine protection operating mode, the engine oil will be severely degraded. Any repairs performed before the engine is cool may cause engine damage. Allow the engine to cool before attempting any repair. Repair the cause of coolant loss, change the oil, and reset the oil life system. See Engine Oil on page 10-10.

Engine Fan If the vehicle has a clutched engine cooling fan, when the clutch is engaged, the fan spins faster to provide more air to cool the engine. In most everyday driving conditions, the fan is spinning slower and the clutch is not fully engaged. This improves fuel economy and reduces fan noise. Under heavy vehicle loading, trailer towing, and/or high outside temperatures, the fan speed

increases as the clutch more fully engages, so an increase in fan noise may be heard. This is normal and should not be mistaken as the transmission slipping or making extra shifts. It is merely the cooling system functioning properly. The fan will slow down when additional cooling is not required and the clutch disengages. This fan noise may also be heard when starting the engine. It will go away as the fan clutch partially disengages. If the vehicle has electric cooling fans, the fans may be heard spinning at low speed during most everyday driving. The fans may turn off if no cooling is required. Under heavy vehicle loading, trailer towing, high outside temperatures, or operation of the air conditioning system, the fans may change to high speed and an increase in fan noise may be heard. This is normal and indicates that the cooling system is functioning properly. The

fans will change to low speed when additional cooling is no longer required. The electric engine cooling fans may run after the engine has been turned. off. This is normal and no service is required.

Power Steering Fluid (1500 Series) The vehicle has electric power steering and does not use power steering fluid.

Power Steering Fluid (2500/3500 Series)

See Engine Compartment Overview on page 10-5 for reservoir location.

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When to Check Power Steering Fluid It is not necessary to regularly check power steering fluid unless there is a leak suspected in the system or an unusual noise is heard. A fluid loss in this system could indicate a problem. Have the system inspected and repaired. Wait for the power steering system to cool, with the engine off, before checking the fluid. How to Check Power Steering Fluid To check the power steering fluid: 1. Turn the key off and let the

engine compartment cool down. 2. Wipe the cap and the top of the

reservoir clean.

3. Unscrew the cap and wipe the

dipstick with a clean rag.

4. Replace the cap and completely

tighten it.

5. Remove the cap again and look at the fluid level on the dipstick.

The level should be between the ADD and FULL marks. If necessary, add only enough fluid to bring the level up to the hashed area between the ADD and FULL marks. What to Use To determine what kind of fluid to use, see Recommended Fluids and Lubricants on page 11-12. Always use the proper fluid.

{ Caution

Use of the incorrect fluid may damage the vehicle and the damages may not be covered by the vehicle warranty. Always use the correct fluid listed in Recommended Fluids and Lubricants on page 11-12.

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10-27

Washer Fluid

What to Use When windshield washer fluid needs to be added, be sure to read the manufacturer's instructions before use. Use a fluid that has sufficient protection against freezing in an area where the temperature may fall below freezing. Adding Washer Fluid The vehicle has a low washer fluid message on the DIC that comes on when the washer fluid is low. The message is displayed for 15 seconds at the start of each ignition cycle. When the WASHER FLUID LOW ADD FLUID message displays, washer fluid will need to be added to the windshield washer fluid reservoir.

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10-28

Vehicle Care

Open the cap with the washer symbol on it. Add washer fluid until the tank is full. See Engine Compartment Overview on page 10-5 for reservoir location.

{ Caution

. Do not use engine coolant

(antifreeze) in the windshield washer. It can damage the windshield washer system and paint.

. Do not mix water with

ready-to-use washer fluid. Water can cause the solution to freeze and damage the washer fluid tank and other parts of the washer system.

(Continued)

Caution (Continued)

. When using concentrated

washer fluid, follow the manufacturer instructions for adding water.

. Fill the washer fluid tank only

three-quarters full when it is very cold. This allows for fluid expansion if freezing occurs, which could damage the tank if it is completely full.

Brakes This vehicle has front and rear disc brakes. Disc brake pads have built-in wear indicators that make a high-pitched warning sound when the brake pads are worn and new pads are needed. The sound can come and go or be heard all the time the vehicle is moving, except when applying the brake pedal firmly.

{ Warning

The brake wear warning sound means that soon the brakes will not work well. That could lead to a crash. When the brake wear warning sound is heard, have the vehicle serviced.

{ Caution

Continuing to drive with worn-out brake pads could result in costly brake repair.

Some driving conditions or climates can cause a brake squeal when the brakes are first applied or lightly applied. This does not mean something is wrong with the brakes.

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Properly torqued wheel nuts are necessary to help prevent brake pulsation. When tires are rotated, inspect brake pads for wear and evenly tighten wheel nuts in the proper sequence to torque specifications in Capacities and Specifications on page 12-2. Brake linings should always be replaced as complete axle sets. Brake Pedal Travel See your dealer if the brake pedal does not return to normal height, or if there is a rapid increase in pedal travel. This could be a sign that brake service might be required. Brake Adjustment Every time the brakes are applied, with or without the vehicle moving, the brakes adjust for wear.

Replacing Brake System Parts The braking system on a vehicle is complex. Its many parts have to be of top quality and work well together if the vehicle is to have really good braking. The vehicle was designed and tested with top-quality brake parts. When parts of the braking system are replaced, be sure to get new, approved replacement parts. If this is not done, the brakes might not work properly. For example, installing disc brake pads that are wrong for the vehicle, can change the balance between the front and rear brakes — for the worse. The braking performance expected can change in many other ways if the wrong replacement brake parts are installed.

Vehicle Care

10-29

Brake Fluid

The brake master cylinder reservoir is filled with DOT 3 brake fluid. See Engine Compartment Overview on page 10-5 for the location of the reservoir. There are only two reasons why the brake fluid level in the reservoir might go down:

The brake fluid level goes down because of normal brake lining wear. When new linings are installed, the fluid level goes back up.

. A fluid leak in the brake

hydraulic system can also cause a low fluid level. Have the brake hydraulic system fixed, since a leak means that sooner or later the brakes will not work well.

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10-30

Vehicle Care

Do not top off the brake fluid. Adding fluid does not correct a leak. If fluid is added when the linings are worn, there will be too much fluid when new brake linings are installed. Add or remove brake fluid, as necessary, only when work is done on the brake hydraulic system.

{ Warning

Refer to the Maintenance Schedule to determine when to check the brake fluid. See Maintenance Schedule on page 11-3. Checking Brake Fluid Check brake fluid by looking at the brake fluid reservoir. See Engine Compartment Overview on page 10-5.

If too much brake fluid is added, it can spill on the engine and burn, if the engine is hot enough. You or others could be burned, and the vehicle could be damaged. Add brake fluid only when work is done on the brake hydraulic system. See “Checking Brake Fluid” in this section.

When the brake fluid falls to a low level, the brake warning light comes on. See Brake System Warning Light on page 5-24.

The fluid level should be above MIN. If it is not, have the brake hydraulic system checked to see if there is a leak.

After work is done on the brake hydraulic system, make sure the level is above MIN but not over the MAX mark.

What to Add Use only new DOT 3 brake fluid from a sealed container. See Recommended Fluids and Lubricants on page 11-12. Always clean the brake fluid reservoir cap and the area around the cap before removing it. This helps keep dirt from entering the reservoir.

{ Warning

With the wrong kind of fluid in the brake hydraulic system, the brakes might not work well. This could cause a crash. Always use the proper brake fluid.

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Battery Refer to the replacement number shown on the original battery label when a new battery is needed. See Engine Compartment Overview on page 10-5 for battery location.

{ Warning

Battery posts, terminals, and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm. Wash hands after handling.

{ Caution

. Using the wrong fluid can

badly damage brake hydraulic system parts. For example, just a few drops of mineral-based oil, such as engine oil, in the brake hydraulic system can damage brake hydraulic system parts so badly that they will have to be replaced. Do not let someone put in the wrong kind of fluid.

. If brake fluid is spilled on the

vehicle's painted surfaces, the paint finish can be damaged. Be careful not to spill brake fluid on the vehicle. If you do, wash it off immediately.

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10-31

Vehicle Storage

{ Warning

Batteries have acid that can burn you and gas that can explode. You can be badly hurt if you are not careful. See Jump Starting on page 10-89 for tips on working around a battery without getting hurt.

Infrequent Usage: Remove the black, negative (−) cable from the battery to keep the battery from running down. Extended Storage: Remove the black, negative (−) cable from the battery or use a battery trickle charger.

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10-32

Vehicle Care

Four-Wheel Drive

Transfer Case

When to Check Lubricant Refer to Maintenance Schedule on page 11-3 to determine when to check the lubricant.

How to Check Lubricant

Electronic Transfer Case

1. Fill Plug 2. Drain Plug

Manual Transfer Case

Automatic Transfer Case

1. Fill Plug 2. Drain Plug

1. Fill Plug 2. Drain Plug To get an accurate reading, the vehicle should be on a level surface. If the level is below the bottom of the fill plug (1) hole, located on the transfer case, some lubricant will need to be added. Add enough lubricant to raise the level to the bottom of the fill plug (1) hole. Use care not to overtighten the plug.

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Vehicle Care

10-33

When to Change Lubricant Refer to Maintenance Schedule on page 11-3 to determine how often to change the lubricant.

What to Use Refer to Recommended Fluids and Lubricants on page 11-12 to determine what kind of lubricant to use.

Front Axle

When to Check and Change Lubricant It is not necessary to regularly check front axle fluid unless a leak is suspected, or an unusual noise is heard. A fluid loss could indicate a problem. Have it inspected and repaired.

How to Check Lubricant To get an accurate reading, the vehicle should be on a level surface.

1500 Series

All Except 1500 Series

1. Fill Plug 2. Drain Plug

1. Fill Plug 2. Drain Plug . When the differential is cold, add

enough lubricant to raise the level from 0 mm (0 in) to 3.2 mm (1/8 in) below the fill plug (1) hole.

. When the differential is at

operating temperature (warm), add enough lubricant to raise the level to the bottom of the fill plug (1) hole.

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10-34

Vehicle Care

What to Use Refer to Recommended Fluids and Lubricants on page 11-12 to determine what kind of lubricant to use.

Rear Axle

When to Check Lubricant It is not necessary to regularly check rear axle fluid unless a leak is suspected or an unusual noise is heard. A fluid loss could indicate a problem. Have it inspected and repaired. All axle assemblies are filled by volume of fluid during production. They are not filled to reach a certain level. When checking the fluid level on any axle, variations in the readings can be caused by factory fill differences between the minimum and the maximum fluid volume. Also, if a vehicle has just been driven before checking the fluid level, it may appear lower than normal because fluid has traveled

out along the axle tubes and has not drained back to the sump area. Therefore, a reading taken five minutes after the vehicle has been driven will appear to have a lower fluid level than a vehicle that has been stationary for an hour or two. The rear axle assembly must be supported on a flat, level surface to get a true reading. How to Check Lubricant

2500HD with 6.0L

All Other Series and Engines

To get an accurate reading, the vehicle should be on a level surface.

For all 4.3L and 5.3L 1500
Series applications, the proper level is 1.0 mm to 19.0 mm (0.04 in to 0.7 in) below the bottom of the fill hole, located on the rear axle. Add only enough fluid to reach the proper level. For 6.2L 1500 Series applications, the proper level is from 15 mm to 40 mm (0.6 in to 1.6 in) below the bottom of the

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fill plug hole, located on the rear axle. Add only enough fluid to reach the proper level. For all 6.0L 2500HD Series applications, the proper level is from 0 mm to 13 mm (0 to 0.5 in) below the bottom of the fill plug hole, located on the rear axle. Add only enough fluid to reach the proper level. For all 6.6L Duramax Diesel 2500HD Series applications and all 3500 Series applications, the proper level is from 17 mm to 21 mm (0.6 in to 0.8 in) below the bottom of the fill plug hole, located on the rear axle. Add only enough fluid to reach the proper level.

What to Use Refer to Recommended Fluids and Lubricants on page 11-12 to determine what kind of lubricant to use.

Noise Control System The following information relates to compliance with federal noise emission standards for vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 4 536 kg (10,000 lb). The noise control system warranty is given in your warranty manual. These standards apply only to vehicles sold in the United States. Federal law prohibits the following acts or the causing thereof: 1. The removal or rendering

inoperative by any person, other than for purposes of maintenance, repair or replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control, prior to its sale or delivery to the ultimate purchaser or while it is in use; or

Vehicle Care

10-35

2. The use of the vehicle after such device or element of design has been removed or rendered inoperative by any person. Among those acts presumed to constitute tampering are the acts listed below.

Insulation: Removal of the noise shields or any underhood insulation.

Engine: Removal or rendering engine speed governor, if the vehicle has one, inoperative so as to allow engine speed to exceed manufacturer specifications.

Fan and Drive: . Removal of fan clutch, if the

vehicle has one, or rendering clutch inoperative.

. Removal of the fan shroud, if the

vehicle has one.

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Vehicle Care

Air Intake: . Removal of the air cleaner

silencer.

. Modification of the air cleaner.

Exhaust: . Removal of the muffler and/or

resonator.

. Removal of the exhaust pipes

and exhaust pipe clamps.

Starter Switch Check

{ Warning When you are doing this inspection, the vehicle could move suddenly. If the vehicle moves, you or others could be injured.

1. Before starting this check, be

sure there is enough room around the vehicle.

2. Apply both the parking brake

1. Before starting this check, be

sure there is enough room around the vehicle. It should be parked on a level surface.

2. Apply the parking brake. Be

ready to apply the regular brake immediately if the vehicle begins to move.

3. With the engine off, turn the

ignition on, but do not start the engine. Without applying the regular brake, try to move the shift lever out of P (Park) with normal effort. If the shift lever moves out of P (Park), contact your dealer for service.

and the regular brake. Do not use the accelerator pedal, and be ready to turn off the engine immediately if it starts.

3. Try to start the engine in each gear. The vehicle should start only in P (Park) or N (Neutral). If the vehicle starts in any other position, contact your dealer for service.

Automatic Transmission Shift Lock Control Function Check

{ Warning When you are doing this inspection, the vehicle could move suddenly. If the vehicle moves, you or others could be injured.

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Ignition Transmission Lock Check If equipped with a key type ignition, while parked and with the parking brake set, try to turn the ignition to LOCK/OFF in each shift lever position.

The ignition should turn to LOCK/OFF only when the shift lever is in P (Park). The ignition key should come out only in LOCK/OFF.

Contact your dealer if service is required.

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10-37

To check the P (Park) mechanism's holding ability: With the engine running, shift to P (Park). Then release the parking brake followed by the regular brake.

Contact your dealer if service is required.

Wiper Blade Replacement Windshield wiper blades should be inspected for wear or cracking. See Maintenance Schedule on page 11-3. Replacement blades come in different types and are removed in different ways. For proper windshield wiper blade length and type, see Maintenance Replacement Parts on page 11-14.

Park Brake and P (Park) Mechanism Check { Warning

When you are doing this check, the vehicle could begin to move. You or others could be injured and property could be damaged. Make sure there is room in front of the vehicle in case it begins to roll. Be ready to apply the regular brake at once should the vehicle begin to move.

Park on a fairly steep hill, with the vehicle facing downhill. Keeping your foot on the regular brake, set the parking brake.

To check the parking brake's holding ability: With the engine running and the transmission in N (Neutral), slowly remove foot pressure from the regular brake pedal. Do this until the vehicle is held by the parking brake only.

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Headlamp Aiming Headlamp aim has been preset and should need no further adjustment. If the vehicle is damaged in a crash, the headlamp aim may be affected. If adjustment to the headlamps is necessary, see your dealer.

10-38

Vehicle Care

{ Caution

Allowing the wiper arm to touch the windshield when no wiper blade is installed could damage the windshield. Any damage that occurs would not be covered by your warranty. Do not allow the wiper arm to touch the windshield.

To replace the windshield wiper blade: 1. Pull the windshield wiper assembly away from the windshield.

2. Press the button (2) in the

middle of the wiper arm connector, and pull the wiper blade away from the arm connector (1).

3. Remove the wiper blade. 4. Reverse Steps 1–3 for wiper

blade replacement.

Glass Replacement If the windshield or front side glass must be replaced, see your dealer to determine the correct replacement glass.

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Bulb Replacement For the proper type of replacement bulbs, see Replacement Bulbs on page 10-42. For any bulb‐changing procedure not listed in this section, contact your dealer.

Halogen Bulbs

{ Warning

Halogen bulbs have pressurized gas inside and can burst if you drop or scratch the bulb. You or others could be injured. Be sure to read and follow the instructions on the bulb package.

LED Lighting This vehicle has several LED lamps. For replacement of any LED lighting assembly, contact your dealer.

Headlamps, Front Turn Signal, Sidemarker, and Parking Lamps

Driver Side 1. Front Turn Signal/Sidemarker/

Parking Lamp

2. High/Low-Beam Headlamp See your dealer for passenger side replacement.

Vehicle Care

10-39

Headlamp 1. Open the hood. 2. Remove the headlamp bulb assembly cover by turning it counterclockwise.

3. Turn the bulb socket

counterclockwise to remove it from the headlamp assembly and pull it straight out.

4. Unplug the electrical connector

from the old bulb by releasing the clip on the bulb socket.

Turn Signal/Sidemarker/ Parking Lamp 1. Open the hood. 2.

If replacing a bulb on the passenger side, remove the engine air cleaner.

3. Turn the bulb socket

counterclockwise to remove it from the headlamp assembly and pull it straight out.

4. Remove the bulb by pulling it straight out of the bulb socket.

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Vehicle Care

Fog Lamps To replace the front fog lamp bulb: 1. Locate the fog lamp under the

front bumper.

2. Disconnect the electrical

connector from the fog lamp bulb assembly by pressing the connector release.

3. Remove the bulb from the

housing by squeezing the two release tabs and pulling it straight out of the assembly.

Taillamps (Chassis Cab Models)

Taillamps, Turn Signal, Stoplamps, and Back-Up Lamps

1. Back-Up Lamp 2. Stoplamp/Taillamp/Turn

Signal Lamp

To replace one of these bulbs: 1. Remove the four screws. 2. Lift the lens off the lamp

assembly.

3. Turn the old bulb

counterclockwise and pull it straight out from the socket.

Single Rear Wheel Lamp Shown, Dual Rear Wheel Lamp Similar

1. Stoplamp/Taillamp/Turn

Signal Lamp

2. Back-Up Lamp 3. Sidemarker Lamp

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To replace one of these bulbs: 1. Open the tailgate.

Center High-Mounted Stoplamp (CHMSL) and Cargo Lamp

Vehicle Care

10-41

To replace one of these bulbs:

1. Cargo Lamps 2. Center High-Mounted Stoplamp

(CHMSL) Bulb

1. Remove the two screws and lift

off the lamp assembly.

2. Turn the bulb socket

counterclockwise and pull it straight out.

3. Pull the bulb straight out from

the socket.

2. Remove the two rear lamp assembly screws and pull rearward until disengaging the two outer pins on the taillamp assembly from the vehicle.

3. Turn the bulb socket

counterclockwise to remove it from the taillamp assembly.

4. Pull the bulb straight out from

the socket.

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Vehicle Care

License Plate Lamp To replace one of these bulbs: 1. Locate the license plate lamp

under the rear bumper.

2. Turn the bulb socket

counterclockwise and pull it straight out.

3. Pull the bulb straight out of the

socket.

Replacement Bulbs

Exterior Lamp

Back-Up Lamp Back-Up Lamp* Cargo Lamp Center High-Mounted Stoplamp (CHMSL) Fog Lamp

Bulb

Number

921 (W16W)

1156

921 (W16W)

921LL

PS24W

Bulb

Number 7443 LL

HIR–2

(9012 LL) W5W LL

194

7444 LL

1157

Exterior Lamp

Front Turn Signal Lamp and Parking Lamp High/Low-Beam Headlamp License Plate Lamp Rear Sidemarker Lamp Stoplamp/Taillamp/ Turn Signal Lamp Stoplamp/Turn Signal Lamp/ Taillamp* * Chassis Cab Models

For replacement bulbs not listed here, contact your dealer.

Electrical System

Electrical System Overload The vehicle has fuses to protect against an electrical system overload. Fuses also protect power devices in the vehicle. Replace a bad fuse with a new one of the identical size and rating. If there is a problem on the road and a fuse needs to be replaced, there are some spare fuses and a fuse puller in the Instrument Panel Fuse Block. The same amperage fuse can also be borrowed. Choose some feature of the vehicle that is not needed to use and replace it as soon as possible. Headlamp Wiring An electrical overload may cause the lamps to go on and off, or in some cases to remain off. Have the

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Look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure you replace a bad fuse with a new one of the identical size and rating. Fuses of the same amperage can be temporarily borrowed from another fuse location, if a fuse goes out. Replace the fuse as soon as you can.

Engine Compartment Fuse Block If the vehicle has a diesel engine, see the Duramax diesel supplement. The engine compartment fuse block is in the engine compartment, on the driver side of the vehicle.

headlamp wiring checked right away if the lamps go on and off or remain off. Windshield Wipers If the wiper motor overheats due to heavy snow or ice, the windshield wipers will stop until the motor cools and will then restart. Although the circuit is protected from electrical overload, overload due to heavy snow or ice may cause wiper linkage damage. Always clear ice and heavy snow from the windshield before using the windshield wipers. If the overload is caused by an electrical problem and not snow or ice, be sure to get it fixed.

Fuses The wiring circuits in the vehicle are protected from short circuits by fuses. This greatly reduces the chance of fires caused by electrical problems.

Lift the cover to access the fuse block.

{ Caution

Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.

A fuse puller is available in the left instrument panel fuse block.

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Vehicle Care

Micro J-Case Fuses

J-Case Fuses

10

11

Usage

Trailer Brake Trailer Battery

Usage

Antilock Brake System Pump Instrument Panel BEC 1
Spare 4WD Trec Spare Instrument Panel BEC 2
Spare Rear Window Defogger Starter

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J-Case Fuses

12
13

Usage

Cooling Fan 1
Cooling Fan 2

Mini Fuses

(2 Pin)

Usage

14

15
16

17

Trailer Stop/Turn Lamps, Left Trailer Park Lamps Trailer Back-up Lamp Trailer Stop/Turn Lamps, Right

Micro Fuses

(2 Pin)

Usage

18
19

20

Fuel Pump Integrated Chassis Control Module Electronic Suspension Control Module

Vehicle Care

10-45

Micro Fuses

(2 Pin)

Usage

Micro Fuses

(2 Pin)

Usage

21

22
23
24
25

26
27
28

29

30
31
32
33
34

Fuel Pump Power Module Upfitter Switch 1
Upfitter 2
Front Wiper Antilock Brake System Valves Upfitter SW 2
Upfitter SW 3
Parking Lamps, Right Parking Lamps, Left Upfitter 3
Upfitter SW 4
Upfitter 4
Back-up Lamps Engine Control Module Ignition

35

36
37
38

39

40

41
42
43
44

45

46
47

Air Conditioning Compressor Clutch Heated Mirrors Upfitter 1
Center High-Mounted Stoplamp Miscellaneous Ignition Transmission Ignition Fuel Pump 2
Cooling Fan Clutch Engine Fuel Injectors A, Odd Fuel Injectors B, Even Oxygen Sensor B Throttle Control

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Vehicle Care

Micro Fuses

(2 Pin)

Usage

Micro Fuses

(3 Pin)

Usage

48
49
50
51

52
53
54
55

Micro Fuses

(3 Pin)

56

Horn Fog Lamp Oxygen Sensor A Engine Control Module Interior Heater Spare Aeroshutter Front Washer

Usage

Air Conditioning Compressor/ Battery Regulated Voltage Control

57

58

59

Air Conditioning Compressor Module/ Battery Pack Transmission Control Module/ Engine Control Module Headlamps

Micro Relays

Usage

60
61
62
63
64
65
66
67

Fuel Pump Upfitter 2
Upfitter 3
Upfitter 4
Trailer Park Lamps Run/Crank Upfitter 1
Fuel Pump 2

Micro Relays

68

69

Mini Relays

70

71

Usage

Air Conditioning Control Starter

Usage Rear Window Defogger Engine Control Module

Solid State

Relay

Usage

72

Cooling Fan Clutch

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Instrument Panel Fuse Block (Left)

The left instrument panel fuse block access door is on the driver side edge of the instrument panel. Pull off the cover to access the fuse block.

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Vehicle Care

The vehicle may not be equipped with all of the fuses, relays, and features shown.

Number

Usage

10

11

Accessory Power Outlet 2
SEO Retained Accessory Power Universal Garage Door Opener/Inside Rearview Mirror Body Control Module 3
Body Control Module 5
Driver Window Switch/Mirror Switch Body Control Module 7
Accessory Power Outlet Retained Accessory Power Accessory Power Outlet Battery

Number

Usage

Number

12

13

14
17

19
20
22

23

24
25

Retained Accessory Power/Accessory Discrete Logic Ignition Switch Switch Backlighting Body Control Module 1
Spare Spare Heater, Ventilation and Air Conditioning/ Auxiliary Heater, Ventilation and Air Conditioning Ignition Instrument Cluster Ignition/Sensing Diagnostic Module Ignition Spare Airbag/Info

26

27
28
29

30
31
32

33
34
36
37
40
41

Usage Passive Entry Passive Start/Heater, Ventilation and Air Conditioning Spare Spare Park Enable/ Electrically Adjustable Pedals SEO Accessory/Run Crank Heated Steering Wheel Spare Instrument Cluster Spare Spare Left Doors Driver Power Seat

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Instrument Panel Fuse Block (Right)

Number

Usage

43

44
45
49

50

Left Front Heated/ Cooled Seat Amplifier Spare Accessory Power Outlet 1/Cigarette Lighter Run/Crank

The right instrument panel fuse block access door is on the passenger side edge of the instrument panel. Pull off the cover to access the fuse block.

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Vehicle Care

The vehicle may not be equipped with all of the fuses, relays, and features shown.

Number

Usage

10
15

18
19
20
23

Accessory Power Outlet 3
Accessory Power Outlet 4
Body Control Module 4
Body Control Module 8
Rear Seat Entertainment Cargo Lamp Steering Wheel Controls Radio Spare Sunroof Data Link Connector/ Driver Seat Module

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Number

Usage

Number

Usage

44
45

46
47
50

51

52

TPIM2/SEO Body Control Module 6
Spare Passenger Seat Retained Accessory Power/Accessory Rear Sliding Window Open Rear Sliding Window Close

26

27

28

32
35
36

37
39
42

43

Export/Power Take Off/SEO Battery 1
Obstacle Detection/ USB Ports Body Control Module 2
SEO Battery 2
AC Inverter Right Front Heated/ Cooled Seat Spare Rear Sliding Window Right Door Window Motor Front Blower

Vehicle Care

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Wheels and Tires

Tires Every new GM vehicle has high-quality tires made by a leading tire manufacturer. See the warranty manual for information regarding the tire warranty and where to get service. For additional information refer to the tire manufacturer.