2016 GMC Savana Owners Manual

Engine Oil Life System

When to Change Engine Oil This vehicle has a computer system that indicates when to change the engine oil and filter. This is based on a combination of factors which include engine revolutions, engine temperature, and miles driven. Based on driving conditions, the mileage at which an oil change is indicated can vary considerably. For the oil life system to work properly, the system must be reset every time the oil is changed. When the system has calculated that oil life has been diminished, it indicates that an oil change is necessary. A CHANGE ENGINE OIL SOON message comes on. See Engine Oil Messages 0 112. Change the oil as soon as possible within the next 1 000 km (600 mi). It is possible that, if driving under the best conditions, the oil life

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system might indicate that an oil change is not necessary for up to a year. The engine oil and filter must be changed at least once a year and, at this time, the system must be reset. Your dealer has trained service people who will perform this work and reset the system. It is also important to check the oil regularly over the course of an oil drain interval and keep it at the proper level. If the system is ever reset accidentally, the oil must be changed at 5 000 km (3,000 mi) since the last oil change. Remember to reset the oil life system whenever the oil is changed. How to Reset the Engine Oil Life System Reset the system whenever the engine oil is changed so that the system can calculate the next engine oil change. To reset the system: 1. Turn the ignition key to ON/

RUN with the engine off.

2. Fully press and release the

accelerator pedal slowly three times within five seconds.

3. Turn the key to LOCK/OFF. If the CHANGE ENGINE OIL SOON message comes back on when the vehicle is started, the engine oil life system has not reset. Repeat the procedure.

Automatic Transmission Fluid

When to Check and Change Automatic Transmission Fluid It is usually not necessary to check the transmission fluid level. The only reason for fluid loss is a transmission leak or overheated transmission. If a small leak is suspected, use the following procedures to check the fluid level. However, if there is a large leak, it may be necessary to have the vehicle towed to a dealer and have it repaired before driving the vehicle further.

Change the fluid and filter at the intervals listed in Maintenance Schedule 0 295, and be sure to use the transmission fluid listed in Recommended Fluids and Lubricants 0 303. How to Check Automatic Transmission Fluid Because this operation can be difficult, it is recommended to have this check done at your dealer, which can monitor the transmission temperature. The transmission fluid level increases with temperature. To obtain a highly accurate fluid level check, the transmission temperature must be measured. If it is decided to check the fluid level, be sure to follow all the instructions here, or a false reading on the dipstick may occur.

Caution

Too much or too little fluid can damage the transmission. Too much can mean that some of the

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fluid could come out and fall on hot engine parts or exhaust system parts, starting a fire. Too little fluid could cause the transmission to overheat. Be sure to get an accurate reading if checking the transmission fluid.

Wait at least 30 minutes with the engine off, before checking the transmission fluid level if the vehicle has been driven:

In hot weather, when outside temperatures are above 32 °C (90 °F).

. The vehicle is heavily loaded. . At high speed for quite a while in

hot weather. In heavy traffic and hot weather.

. While pulling a trailer. After driving under these conditions, a hot check can be performed. The fluid should be hot, which is 71 °C to 93 °C (160 °F to 200 °F).

A cold fluid level check can be performed after the vehicle has been sitting for eight hours or more with the engine off, but this is used only as a reference. Let the engine run at idle for five minutes if the outside temperature is between 15 ° C to 32 °C (60 °F to 90 °F). Should the fluid level be low during this cold check, the fluid must be checked warm or hot before adding fluid. If the outside temperature is colder than 15 °C (60 °F) or hotter than 32 ° C (90 °F), a cold check cannot be performed. A warm fluid level check can be performed by driving the vehicle under lightly loaded conditions and outside temperatures between 10 °C to 27 °C (50 °F to 80 °F). The vehicle should be driven for at least 24 km (15 mi) before performing a warm check. Checking the fluid warm or hot will give a more accurate reading of the fluid level than a cold check. Because the vehicle is equipped with a high-efficiency air-to-oil cooler, the transmission fluid temperature may not reach the

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required hot fluid level checking temperature under normal lightly loaded driving vehicle conditions.

Checking the Fluid Level Prepare the vehicle: 1. Park the vehicle on a level

place. Keep the engine running.

2. With the parking brake applied, place the shift lever in P (Park). 3. With a foot on the brake pedal,

move the shift lever through each gear range, pausing for about three seconds in each range. When M is reached, move the selector from M1
through M3. Then, position the shift lever in P (Park).

4. Let the engine run at idle for

two minutes or more.

Then, without shutting off the engine, use the steps that follow.

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The transmission dipstick is near the center of the engine compartment and will be labeled with the graphic shown. See Engine Compartment Overview 0 216 for more information on location.

1. COLD Range 2. WARM Range 3. HOT Range

1. Flip the handle up, pull out the

dipstick, and wipe it with a clean rag or paper towel.

2. Push it back in all the way, wait three seconds, and pull it back out again.

3. Check both sides of the

dipstick, and read the lower level. The fluid level must be in the COLD (1) range for a cold check, transmission temperature 27 °C to 32 °C (80 °F to 90 °F); between the COLD (1) and HOT (3) range for a WARM (2) check, 50 °C to 60 °C (122 °F to 140 °F); or in the HOT (3) cross-hatched range for a hot check, 71 °C to 93 °C (160 °F to 200 °F). Be sure to keep the dipstick pointed down to get an accurate reading. If the fluid level is in the acceptable range, push the dipstick back in all the way; then flip the handle down to lock the dipstick in place.

4.

How to Add Automatic Transmission Fluid Refer to Recommended Fluids and Lubricants 0 303 to determine what kind of transmission fluid to use.

1. WARM Range 2. HOT Range

Using a funnel, add fluid down the transmission dipstick tube only after checking the transmission fluid while it is warm or hot. A cold check is used only as a reference. If the fluid level is low, add only enough of the proper fluid to bring the level up to the middle of the WARM (1) or HOT (2) range depending on the ambient temperature and prior driving conditions. Refer to “How to Check Automatic Transmission Fluid” earlier in this section for instructions on driving to achieve warm or hot transmission fluid. It does not take much fluid, generally less than 0.5 L (1 pt). Do not overfill.

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Caution

Use of the incorrect automatic transmission fluid may damage the vehicle, and the damage may not be covered by the vehicle warranty. Always use the automatic transmission fluid listed in Recommended Fluids and Lubricants 0 303.

. After adding fluid, recheck the fluid level as described under “How to Check Automatic Transmission Fluid,” earlier in this section.

. When the correct fluid level is

obtained, push the dipstick back in all the way; then flip the handle down to lock the dipstick in place.

Engine Air Cleaner/Filter

The engine air cleaner/filter is near the center of the engine compartment. See Engine Compartment Overview 0 216. When to Inspect the Engine Air Cleaner/Filter For intervals on changing and inspecting the engine air filter, see Maintenance Schedule 0 295.

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How to Inspect the Engine Air Cleaner/Filter Do not start the engine or have the engine running with the engine air cleaner/filter housing open. Before removing the engine air cleaner/ filter, make sure that the engine air cleaner/filter housing and nearby components are free of dirt and debris. Remove the engine air cleaner/filter. Lightly tap and shake the engine air cleaner/filter (away from the vehicle), to release loose dust and dirt. Inspect the engine air cleaner/filter for damage, and replace if damaged. Do not clean the engine air cleaner/filter or components with water or compressed air. To inspect or replace the engine air cleaner/filter: 1. Unhook the retainer clips and

remove the cover.

2. Lift the filter out of the engine air cleaner/filter housing. Care should be taken to dislodge as little dirt as possible.

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3. Clean the engine air cleaner/

4.

filter housing. Inspect or replace the engine air cleaner/filter. Make sure that the filter fits properly into the housing.

5. Reinstall the cover and fasten

the retaining clips.

{ Warning

Operating the engine with the air cleaner/filter off can cause you or others to be burned. The air cleaner not only cleans the air; it helps to stop flames if the engine backfires. Use caution when working on the engine and do not drive with the air cleaner/filter off.

Caution

If the air cleaner/filter is off, dirt can easily get into the engine, which could damage it. Always have the air cleaner/filter in place when you are driving.

Cooling System The cooling system allows the engine to maintain the correct working temperature.

1. Radiator Pressure Cap 2. Coolant Recovery Tank 3. Engine Cooling Fan (Out

of View)

{ Warning

Warning (Continued)

keep hands, clothing, and tools away from any engine cooling fan.

{ Warning

Heater and radiator hoses, and other engine parts, can be very hot. Do not touch them. If you do, you can be burned. Do not run the engine if there is a leak. If you run the engine, it could lose all coolant. That could cause an engine fire, and you could be burned. Get any leak fixed before you drive the vehicle.

Caution

An electric engine cooling fan can start even when the engine is not running. To avoid injury, always

Using coolant other than DEX-COOL® can cause premature engine, heater core,

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or radiator corrosion. In addition, the engine coolant could require changing sooner. Any repairs would not be covered by the vehicle warranty. Always use DEX-COOL (silicate-free) coolant in the vehicle.

Engine Coolant The cooling system in the vehicle is 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 0 228.

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.

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.

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. 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 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 0 303.

Never dispose of engine coolant by putting it in the trash, pouring it on the ground, or into sewers, streams,

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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. Checking Coolant The vehicle must be on a level surface when checking the coolant level. Check to see if coolant is visible in the coolant recovery tank. If the coolant inside the coolant recovery tank is boiling, do not do anything else until it cools down. If coolant is visible but the coolant level is not at or above the COLD FILL mark, add a 50/50 mixture of clean, drinkable water and DEX-COOL coolant at the coolant recovery tank, but be sure the cooling system is cool before this is done.

Caution

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

If coolant is needed, add the proper DEX-COOL coolant mixture at the coolant recovery tank. How to Add Coolant to the Radiator

{ Warning

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

The coolant recovery tank cap has this symbol on it. When the engine is cold, the coolant level should be at or above the COLD FILL mark. If it is not, there could be a leak in the cooling system. If the coolant is low, add the coolant or take the vehicle to a dealer for service. How to Add Coolant to the Recovery Tank for Gasoline Engines

{ 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.

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If coolant is needed, add the proper mixture directly to the radiator, but be sure the cooling system is cool before this is done.

1. Remove the radiator pressure cap when the cooling system, including the radiator pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly counterclockwise until it first stops. Do not press down while turning the pressure cap. 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, but now push down as you turn it. Remove the pressure cap.

3. Fill the radiator with the proper DEX-COOL coolant mixture, up to the base of the filler neck. See Recommended Fluids and Lubricants 0 303 for more information about the proper coolant mixture.

4. Fill the coolant recovery tank to

the COLD FILL mark.

5. Reinstall the cap back on the

coolant recovery tank, but leave the radiator pressure cap off.

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Then check to see if the engine cooling fans are running. If the engine is overheating, the fan should be running. If it is not, do not continue to run the engine and have the vehicle serviced. See if the engine cooling fan speed increases when idle speed is doubled by pushing the accelerator pedal down. If it does not, the vehicle needs service. Turn off the engine.

Caution

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

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.

Engine Overheating If the vehicle has a diesel engine, see the Duramax diesel supplement. The vehicle has an indicator to warn of engine overheating. There is an engine coolant temperature gauge on the vehicle's instrument cluster. See Engine Coolant Temperature Gauge 0 96. If the decision is made not to lift the hood when this warning appears, but instead get service help right away, see Roadside Assistance Program 0 314. If the decision is made to lift the hood, make sure the vehicle is parked on a level surface.

6. Start the engine and let it run until the upper radiator hose can be felt getting hot. Watch out for the engine cooling fan. 7. By this time, the coolant level inside the radiator filler neck may be lower. If the level is lower, add more of the proper DEX-COOL coolant mixture through the filler neck until the level reaches the base of the filler neck.

8. Replace the pressure cap. At

any time during this procedure if coolant begins to flow out of the filler neck, reinstall the pressure cap.

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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 If an engine overheat warning is displayed but no steam can be 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 “Driving on Grades” under Trailer Towing 0 204.

If the overheat warning is displayed with no sign of steam: 1. Turn the air 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 engine coolant temperature 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

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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. If the warning continues, pull over, stop, and park the vehicle right away. If there is still no sign of steam, push down the accelerator until the engine speed is about twice as fast as normal idle speed for at least three minutes while parked. If the warning is still on, turn off the engine until it cools down. If the decision is made not to lift the hood, get service help right away.

Engine Fan 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

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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 partially disengages. This fan noise may be heard when starting the engine. It will go away as the fan clutch partially disengages.

Power Steering Fluid

The power steering fluid reservoir is in the engine compartment on the driver side of the vehicle. See Engine Compartment Overview 0 216 for reservoir location.

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. 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 at the COLD FILL mark. If necessary, add only enough fluid to bring the level up to the mark. To prevent contamination of brake fluid, never check or fill the power steering reservoir with the brake master cylinder cover off. What to Use

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 0 303.

To determine what kind of fluid to use, see Recommended Fluids and Lubricants 0 303. Always use the proper fluid. Failure to use the proper fluid can cause leaks and damage hoses and seals.

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Washer Fluid

What to Use When the vehicle needs windshield washer fluid, be sure to read the manufacturer's instructions before use. If operating the vehicle in an area where the temperature may fall below freezing, use a fluid that has sufficient protection against freezing. Adding Washer Fluid

Open the cap with the washer symbol on it. Add washer fluid until the tank is full. See Engine Compartment Overview 0 216 for reservoir location.

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Caution

Caution (Continued)

. Do not use washer fluid that

contains any type of water repellent coating. This can cause the wiper blades to chatter or skip.

. 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.

. 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

(Continued)

freezing occurs, which could damage the tank if it is completely full.

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 when 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.

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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. 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. See Capacities and Specifications 0 307. Brake pads should be replaced as complete 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 may be required.

Replacing Brake System Parts Always replace brake system parts with new, approved replacement parts. If this is not done, the brakes may not work properly. The braking performance expected can change in many other ways if the wrong replacement brake parts are installed or parts are improperly installed.

Brake Fluid

The brake master cylinder reservoir is filled with DOT 3 brake fluid. See Engine Compartment Overview 0 216 for the location of the reservoir. There are only two reasons why the brake fluid level in the reservoir may go down:

. Normal brake lining wear. When

new linings are installed, the fluid level goes back up. . A fluid leak in the brake

hydraulic system. Have the brake hydraulic system fixed. With a leak, the brakes will not work well.

Always clean the brake fluid reservoir cap and the area around the cap before removing it. 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 fluid, as necessary, only when work is done on the brake hydraulic system.

{ Warning

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.

(Continued)

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Warning (Continued)

Add brake fluid only when work is done on the brake hydraulic system.

When the brake fluid falls to a low level, the brake warning light comes on. See Brake System Warning Light 0 101. Brake fluid absorbs water over time. Replace brake fluid at the specified intervals to prevent increased stopping distance. See Maintenance Schedule 0 295. Checking Brake Fluid Check brake fluid by looking at the brake fluid reservoir. See Engine Compartment Overview 0 216.

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 GM approved DOT 3
brake fluid from a clean, sealed container. See Recommended Fluids and Lubricants 0 303.

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{ Warning

The wrong or contaminated brake fluid could result in damage to the brake system. This could result in the loss of braking leading to a possible injury. Always use the proper brake fluid.

Caution

If brake fluid is spilled on the vehicle's painted surfaces, the paint finish can be damaged. Immediately wash off any painted surface.

Battery - North America The original equipment battery is maintenance free. Do not remove the cap and do not add fluid. Refer to the replacement number shown on the original battery label when a new battery is needed. See Engine Compartment Overview 0 216 for battery location.

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{ Warning WARNING: Battery posts, terminals, and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Batteries also contain other chemicals known to the State of California to cause cancer. WASH HANDS AFTER HANDLING. See California Proposition 65 Warning 0 213.

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 - North America 0 280 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.

Rear Axle

When to Check Lubricant Refer to the Maintenance Schedule 0 295 to determine how often to check the lubricant. How to Check Lubricant To get an accurate reading, the vehicle should be on a level surface.

The proper level for the 2500 and 3500 Series is from 0 to 6 mm (1/ 4 in) below the bottom of the fill plug hole. Add only enough fluid to reach the proper level. What to Use Refer to Recommended Fluids and Lubricants 0 303 to determine what kind of lubricant to use.

Noise Control System

Noise Emission Warranty General Motors warrants to the first person who purchases this vehicle for purposes other than resale and to each subsequent purchaser that

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this vehicle as manufactured by General Motors was designed, built and equipped to conform at the time it left General Motors control with all applicable U.S. EPA Noise Control Regulations. This warranty covers this vehicle as designed, built and equipped by General Motors and is not limited to any particular part, component or system of the manufactured by General Motors. Defects in design, assembly or any part, component or system of the vehicle manufactured by General Motors, which at the time it left General Motors control caused noise emissions to exceed Federal standards, are covered by the warranty for the life of the vehicle. 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 lbs). The Maintenance Schedule provides information on maintaining the noise control system to minimize degradation of the noise emission control system during the

life of the vehicle. The noise control system warranty is given in the vehicle warranty booklet. 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

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.

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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.

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.

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Fuel Operated Heater (FOH) — Diesel Engine: . Removal of the muffler.

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

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.

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.

Ignition Transmission Lock Check 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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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.

. 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 and cracking. See Maintenance Schedule 0 295. Replacement blades come in different types and are removed in different ways. For proper type and length, see Maintenance Replacement Parts 0 304.

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

(Continued)

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237

Caution (Continued)

the vehicle warranty. Do not allow the wiper arm to touch the windshield.

1. Lift the wiper arm away from

the windshield.

2. Push the release lever (2) to

disengage the hook and push the wiper arm (1) out of the blade assembly (3).

3. Push the new blade assembly securely on the wiper arm until the release lever clicks into place.

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Vehicle Care

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.

Bulb Replacement For the proper type of replacement bulbs, see Replacement Bulbs 0 242. For any bulb-changing procedure not listed in this section, contact your dealer.

Headlamps

Composite Headlamp

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.

1. High-Beam Headlamp 2. Low-Beam Headlamp

To remove the headlamp assembly from the vehicle and access the bulbs: 1. Open the hood. See Hood

0 214.

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2. Remove the two bolts from the

5. Disconnect the electrical

headlamp assembly.

connector.

3. Lift the headlamp assembly to release the lower tabs from the radiator support.

4. Turn the headlamp forward and

7.

upward to remove it from the grille.

6. Turn the bulb counterclockwise

one-quarter turn to remove it from the headlamp assembly. Install the new bulb into the headlamp assembly and connect the electrical connector.

8. Reverse the steps to reinstall

the headlamp assembly. To prevent headlamp vibration and shortened bulb life, be sure to insert the headlamp

Vehicle Care

239

assembly tabs in the slots at the lower portion of the housing.

Sealed-Beam Headlamp

1. Headlamp Retainer Screws 2. Headlamp Retainer 3. Sealed-Beam

Headlamp Bulb

To replace one of these bulbs: 1. Remove the four screws (1)

from the headlamp retainer (2). Pull the retainer (2) out and set it aside.

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Vehicle Care

2. Pull the bulb (3) forward to gain

access to the electrical connector.

Front Turn Signal, Sidemarker, and Parking Lamps

3. Disconnect the electrical

connector (2) and remove the headlamp bulb (1).

4. Reverse Steps 1–3 to reinstall

the headlamp.

1. Front Parking and Turn

Signal Lamp

2. Front Sidemarker Lamp To replace the front turn signal, sidemarker, and/or parking lamp bulb(s):

1. Use a small tool to unlatch the

outboard clip on the lamp by pushing inboard and prying the lamp assembly forward.

2. Remove the lamp from the

grille.

3. Turn the bulb socket

counterclockwise one-quarter turn and remove it from the lamp assembly.

4. Remove the bulb from the

socket by pulling it straight out.

5. Replace the bulb. 6. Turn the bulb socket clockwise

to reinstall it in the lamp assembly.

7. Reinstall the lamp assembly

into the grille until the outboard clip snaps into place.

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Taillamps To replace a taillamp/turn signal lamp or back-up lamp bulb:

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241

1. Remove the two inboard nuts from the inside of the taillamp assembly.

2. The third nut (3) is under the applique piece (2) above the lamp. Remove the two inboard applique nuts. Pull the applique (2) straight rearward slightly to clear the studs. Then rotate the applique (2) just far enough to gain access to the outer push pins (1).

3. Carefully disconnect the push

pins (1) from the applique bracket.

4. Remove the third nut (3) from

the upper outboard side of the lamp.

5. Remove the taillamp assembly

from the vehicle.

6. Remove the taillamp/turn signal

lamp (1) or back-up lamp (2) bulb socket by turning it counterclockwise one-quarter turn and pulling it out of the lamp assembly.

7. Remove the bulb by pulling it

straight out.

8. Push the new bulb into the

socket.

9. Reinstall the bulb socket by turning it clockwise into the lamp assembly.

10. Reverse Steps 1–5 to reinstall

the taillamp assembly and applique.

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Vehicle Care

Center High-Mounted Stoplamp (CHMSL) The CHMSL is above the rear doors at the center of the vehicle. To replace a bulb:

4. Pull the old bulb straight out of

2. License Plate Bulb

the socket and push the new bulb into the socket.

Assembly

3. Screws

5. Turn the bulb socket clockwise

one-quarter turn to install it in the lamp assembly.

6. Reinstall the CHMSL assembly

and two screws.

Do not block or damage the CHMSL when items are loaded on the roof of the vehicle.

License Plate Lamp

To replace one of these bulbs: 1. Remove the screws (3) that secure the license plate bulb assembly (2).

2. Turn the bulb socket (1)

counterclockwise and pull the bulb straight out of the socket. Install the new bulb.

3. 4. Reverse Steps 1 and 2 to

reinstall the license plate bulb assembly.

Replacement Bulbs

Bulb

Number 3157KX

912LL

Exterior Lamp

Back-up, Rear Parking, Stoplamp, and Turn Signal Lamp Center High-Mounted Stoplamp (CHMSL)

1. Remove the two screws from

the CHMSL assembly.

2. Remove the CHMSL assembly. 3. Turn the bulb socket

counterclockwise one-quarter turn to remove it from the lamp assembly.

1. Bulb Socket

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Exterior Lamp

Front Parking and Turn Signal Lamp Front Sidemarker Lamp License Plate Lamp Headlamps

Composite High-Beam Headlamp Composite Low-Beam Headlamp Sealed Beam Headlamp

Bulb

Number 3157KX

194LL

194LL

9005LL

9006LL

H6054

For replacement bulbs not listed here, contact your dealer.

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243

Headlamp Wiring An electrical overload may cause the lamps to go on and off, or in some cases to remain off. Have the 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.

Electrical System

Electrical System Overload The vehicle has fuses and circuit breakers to protect against an electrical system overload. When the current electrical load is too heavy, the circuit breaker opens and closes, protecting the circuit until the current load returns to normal or the problem is fixed. This greatly reduces the chance of circuit overload and fire caused by electrical problems. Fuses and circuit breakers 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, the same amperage fuse can be borrowed. Choose some feature of the vehicle that is not needed to use and replace it as soon as possible.

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Caution

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

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Vehicle Care

Fuses and Circuit Breakers The wiring circuits in the vehicle are protected from short circuits by a combination of fuses and circuit breakers. This greatly reduces the chance of fires caused by electrical problems. 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.

Engine Compartment Fuse Block The fuse block is located in the engine compartment on the driver side of the vehicle.

Vehicles with upfitter content See www.gmupfitter.com for upfitter provisions and best practices.

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245

Mini Fuse

Usage

10
11
12

13
14
16
17
18

Spare Spare Fuel System Control Module Ignition Body Control Module 5
Body Control Module 7
Body Control Module 4
Instrument Cluster Trailer Wiring Inside Rear Vision Camera Module Spare Windshield Washer Horn Transmission Air Conditioning Compressor

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

Mini Fuse

Usage

Right Stop/Turn Trailer

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Vehicle Care

Mini Fuse

Usage

Mini Fuse

19

20
21

22
23
24
25

26

27

28
29

30

31

Engine Control Module Battery Spare Left Stop/Turn Trailer Spare Spare Fuel Pump Auxiliary Power Outlet Body Control Module 3
Special Equipment Option Airbag Steering Wheel Sensor Engine Control Module Ignition/ Glow Plug Module Transmission Control Module Ignition

32

33

34
35

36

51

52

53

54

55
56

Usage Transmission Control Module Battery Rear Parking Aid Module Spare Fuel Operated Heater Module Fuel System Control Module Battery Left High-Beam Headlamp Right High-Beam Headlamp Left Low-Beam Headlamp Right Low-Beam Headlamp Wiper Canister Vent Solenoid

Mini Fuse

58

59

61
62

63
64

65

66

67

68

69

Usage Body Control Module 2
Body Control Module 1
Spare Oxygen Sensor 2
(Post), EV Fan (Diesel) Spare Mass Air Flow/ Canister Vent Odd Ignition/ Injectors Daytime Running Lamps 2
(LOLVL-V22) (If Equipped) Daytime Running Lamps 1 (UPLVL +V22) (If Equipped) Auxiliary Stop Lamps Trailer Stop Lamps

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Mini Fuse

Usage

J-Case Fuse

Usage

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247

70
71

72

73

75
76
77

78

79

Spare Fuel Heater/Flex Fuel Sensor Body Control Module 6
Lighter/Data Link Connection V6 Fuel Injectors Spare Oxygen Sensor 2 (Pre) Engine Control Module Powertrain Even Ignition/ Injectors

J-Case Fuse

Usage

41
42
43

ABS Motor ABS Module Spare Trailer Wiring Fan High

44
45

46
47
74

Starter Solenoid Engine Control Module/Powertrain Spare Fan Lo Front Blower

Relay

Usage

15
37
38
39
40

48
49
50
57
60

Run/Crank Spare Fuel Pump Crank Air Conditioning Compressor Fan High Powertrain Spare Fan Low Fan Control

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Floor Console Fuse Block

The floor console fuse block is under the driver seat.

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

Mini-Fuse

Usage

F1
F2

F3

F4
F5
F6

F7

F8

F9

F10

F11

F12

Empty Steering Wheel Sensor Auxiliary Parking Lamps (Cut-Away) Front Park Lamps Trailer Park Lamps Upfitter Park Lamps Right Rear Park Lamp Left Rear Park Lamp Outside Rearview Mirror Switch