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engine protection.
Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty. What to Do with Used Oil Used engine oil contains certain elements that can be unhealthy for your skin and could even cause cancer. Do not let used oil stay on your skin for very long. Clean your skin and nails with soap and water, or a good hand cleaner. Wash or properly dispose of clothing or rags containing used engine oil. See the manufacturer's warnings about the use and disposal of oil products. Used oil can be a threat to the environment. If you change your own oil, be sure to drain all the oil from the filter before disposal. Never dispose of oil by putting it in the trash or pouring it on the ground, into sewers, or into streams or bodies of water. Recycle it by taking it to a place that collects used oil.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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, a CHANGE ENGINE OIL SOON message comes on to indicate that an oil change is necessary. See Engine Oil Messages 0 128. 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 system may 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. Always reset the engine oil life to 100% after every oil change. It will not reset itself. To reset the engine oil life system: 1. Display the REMAINING OIL LIFE on the DIC. See Driver Information Center (DIC) 0 123.
2. Press and hold V. The oil life
will change to 100%.
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The oil life system can also be reset as follows: 1. Turn the ignition to ON/RUN
with the engine off.
2. Fully press the accelerator
pedal slowly three times within five seconds.
3. Display the REMAINING OIL
LIFE on the DIC. If the display shows 100%, the system is reset.
If the CHANGE ENGINE OIL SOON message comes back on when the vehicle is started and/or the REMAINING OIL LIFE is near 0%, the engine oil life system has not been reset. Repeat the procedure.
Automatic Transmission Fluid (6 Speed Transmission)
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
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transmission. If a small leak is suspected, then use the following checking procedures to check the fluid level. However, if there is a large leak, then it may be necessary to have the vehicle towed to a dealer service department and have it repaired before driving the vehicle further.
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 0 355.
Change the fluid and filter at the scheduled maintenance intervals listed in Maintenance Schedule 0 346. Be sure to use the transmission fluid listed in Recommended Fluids and Lubricants 0 355.
How to Check Automatic Transmission Fluid
Caution
Too much or too little fluid can damage the transmission. Too much can mean that some of the 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.
Before checking the fluid level, prepare the vehicle: 1. Start the engine and park the
vehicle on a level surface. Keep the engine running.
2. Apply the parking brake and
place the shift lever in P (Park).
3. With your foot on the brake pedal, move the shift lever through each gear range, pausing for about
three seconds in each range. Then, move the shift lever back to P (Park).
4. Allow the engine to idle (500–
800 rpm) for at least one minute. Slowly release the brake pedal.
5. Keep the engine running and
check the transmission fluid temperature on the Driver Information Center (DIC). See Driver Information Center (DIC) 0 123.
6. Using the transmission fluid
temperature reading, determine and perform the appropriate check procedure. If the transmission fluid temperature reading is not within the required temperature ranges, allow the vehicle to cool, or operate the vehicle until the appropriate transmission fluid temperature is reached.
Cold Check Procedure Use this procedure only as a reference to determine if the transmission has enough fluid to be
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
operated safely until a hot check procedure can be made. The hot check procedure is the most accurate method to check the fluid level. Perform the hot check procedure at the first opportunity. Use this cold check procedure to check fluid level when the transmission temperature is between 27 °C and 32 °C (80 °F and 90 °F).
3.
Install the dipstick by pushing it back in all the way; wait three seconds, and then pull it back out again.
4. Check both sides of the
dipstick and read the lower level. Repeat the check procedure to verify the reading.
1. Locate the transmission dipstick at the rear of the engine compartment, on the passenger side of the vehicle. See Engine Compartment Overview 0 255.
2. Flip the handle up, then pull out
the dipstick and wipe it with a clean rag or paper towel.
5.
If the fluid level is below the COLD check band, add only enough fluid as necessary to bring the level into the COLD band. It does not take much fluid, generally less than 0.5 L (1 pt). Do not overfill.
6. Perform a hot check at the first
opportunity after the transmission reaches a normal operating temperature between 71 °C to 93 °C (160 °F to 200 °F).
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7.
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.
Hot Check Procedure Use this procedure to check the transmission fluid level when the transmission fluid temperature is between 71 °C and 93 °C (160 °F and 200 °F). The hot check is the most accurate method to check the fluid level. The hot check should be performed at the first opportunity in order to verify the cold check. The fluid level rises as fluid temperature increases, so it is important to ensure the transmission temperature is within range.
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1. Locate the transmission dipstick at the rear of the engine compartment, on the passenger side of the vehicle. See Engine Compartment Overview 0 255.
2. Flip the handle up, then pull out
3.
the dipstick and wipe it with a clean rag or paper towel. Install the dipstick by pushing it back in all the way; wait three seconds, and then pull it back out again.
4. Check both sides of the
dipstick and read the lower level. Repeat the check procedure to verify the reading.
5. Safe operating level is within the HOT cross hatch band on the dipstick. If the fluid level is not within the HOT band, and
6.
the transmission temperature is between 71 °C and 93 °C (160 °F and 200 °F), add or drain fluid as necessary to bring the level into the HOT band. If the fluid level is low, add only enough fluid to bring the level into the HOT band. It does not take much fluid, generally less than 0.5 L (1 pt). Do not overfill. 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. Consistency of Readings Always check the fluid level at least twice using the procedure described previously. Consistency (repeatable readings) is important to maintaining proper fluid level. If readings are still inconsistent, contact the dealer.
Automatic Transmission Fluid (8 Speed Transmission)
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. This vehicle is not equipped with a transmission fluid level dipstick. There is a special procedure for checking and changing the transmission fluid in these vehicles. Because this procedure is difficult, this should be done at the dealer. Contact the dealer for additional information or the procedure can be found in the service manual. See Service Publications Ordering Information 0 372.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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 0 355.
Change the fluid and filter at the scheduled maintenance intervals listed in Maintenance Schedule 0 346. Be sure to use the transmission fluid listed in Recommended Fluids and Lubricants 0 355.
Engine Air Cleaner/Filter If the vehicle has a diesel engine, see “Pickup Models” under “Engine Air Cleaner/Filter” in the Duramax diesel supplement for the correct inspection and replacement procedures.
The engine air cleaner/filter is near the center of the engine compartment. See Engine Compartment Overview 0 255. When to Inspect the Engine Air Cleaner/Filter For intervals on changing and inspecting the engine air filter, see Maintenance Schedule 0 346. 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.
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To inspect or replace the engine air cleaner/filter:
1. Screws 2. Electrical Connectors 3. Air Duct Clamp
1. Locate the air cleaner/filter
assembly. See Engine Compartment Overview 0 255.
2. Disconnect the outlet duct by
loosening the air duct clamp (3).
3. Disconnect the electrical
connectors (2) and the connector harness from the cover.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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 If the vehicle has the Duramax® diesel engine, see the Duramax diesel supplement for more information. The cooling system allows the engine to maintain the correct working temperature.
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4. Remove the four screws (1) on top of the cover of the housing and lift up the cover.
5. Remove the engine air cleaner/
filter from the housing. Take care to dislodge as little dirt as possible.
6. Clean the engine air cleaner/ filter sealing surfaces and the housing. Inspect or replace the engine air cleaner/filter.
7.
8. Reverse Steps 2–4 to reinstall
the filter cover housing.
{ 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.
5.3L V8 Engine Shown, 6.2L
V8 Engine Similar
1. Coolant Surge Tank 2. Coolant Surge Tank
Pressure Cap
3. Engine Cooling Fan (Out
of View)
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
{ 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
Using coolant other than DEX-COOL® can cause premature engine, heater core, 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.
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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 0 270. 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
(Continued)
6.0L V8 Engine
1. Coolant Surge Tank 2. Coolant Surge Tank
Pressure Cap
3. Engine Cooling Fan (Out
of View)
{ Warning
An electric engine cooling fan can start even when the engine is not running. To avoid injury, always keep hands, clothing, and tools away from any engine cooling fan.
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Warning (Continued)
Caution
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.
. 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.
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 0 355.
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.
Checking Coolant The coolant surge tank is in the engine compartment on the passenger side of the vehicle. See Engine Compartment Overview 0 255. 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, do not do anything else until it cools down. If coolant is visible but the coolant level is not at or above the FULL COLD mark, add a 50/50 mixture of clean, drinkable water and DEX-COOL coolant at the coolant surge tank, but be sure the cooling system is cool before this is done.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
5.3L V8 Engine Shown, 6.2L
V8 Engine Similar
6.0L V8 Engine
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. How to Add Coolant to the Coolant Surge Tank 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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{ 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 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.
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Vehicle Care
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
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.
Engine Overheating If the vehicle has the Duramax diesel engine, see the Duramax diesel supplement. 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 0 110. 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 0 128 and Engine Power Messages 0 129. If the decision is made not to lift the hood when this warning appears, get service help right away. See Roadside Assistance Program 0 367. If the decision is made to lift the hood, make sure the vehicle is parked on a level surface.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Then check to see if the engine cooling fan is 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.
Caution
Running the engine without coolant may cause damage or a fire. Vehicle damage would not be covered by the vehicle warranty. See Overheated Engine Protection Operating Mode 0 272
for information on driving to a safe place in an emergency.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 (Continued)
Warning (Continued)
steam coming from it. 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 vehicles 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. See Overheated Engine Protection Operating Mode 0 272
for information on driving to a safe place in an emergency.If No Steam is Coming from the Engine Compartment The ENGINE OVERHEATED STOP ENGINE or the ENGINE OVERHEATED IDLE ENGINE
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271
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
0 231.
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.
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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. 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. Also, see “Overheated Engine Protection Operating Mode” following.
Overheated Engine Protection Operating Mode 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.
Caution
After driving in the overheated engine protection operating mode, the engine oil will be
(Continued)
Caution (Continued)
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 0 258.
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
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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 0 255 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.
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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.
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Vehicle Care
What to Use To determine what kind of fluid to use, see Recommended Fluids and Lubricants 0 355. 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 0 355.
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.
Open the cap with the washer symbol on it. Add washer fluid until the tank is full. See Engine Compartment Overview 0 255 for reservoir location.
Caution
. 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)
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Caution (Continued)
Caution
freezing occurs, which could damage the tank if it is completely full.
Continuing to drive with worn-out brake pads could result in costly brake repair.
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.
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 in Capacities and Specifications 0 360. 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 may be required.
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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 0 255 for the location of the reservoir.
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Vehicle Care
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. 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 0 116. Brake fluid absorbs water over time. Replace brake fluid at the specified intervals to prevent increased stopping distance. See Maintenance Schedule 0 346. Checking Brake Fluid Check brake fluid by looking at the brake fluid reservoir. See Engine Compartment Overview 0 255.
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 0 355.GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
{ 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 0 255 for battery location.
{ 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 0 252.
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 0 326 for tips on working around a battery without getting hurt.
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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.
Four-Wheel Drive
Transfer Case
When to Check Lubricant Refer to Maintenance Schedule 0 346 to determine when to check the lubricant.
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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.
When to Change Lubricant Refer to Maintenance Schedule 0 346 to determine how often to change the lubricant.
What to Use Refer to Recommended Fluids and Lubricants 0 355 to determine what kind of lubricant to use.
Front Axle
2. Drain Plug
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
1. Fill Plug
All Except 1500 Series
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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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
What to Use Refer to Recommended Fluids and Lubricants 0 355 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
All Other Series and Engines
To get an accurate reading, the vehicle should be on a level surface. . For 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 0 355 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 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 vehicle 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 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
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.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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.
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.
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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.
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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.
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
(Continued)
Warning (Continued)
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 or cracking. Replacement blades come in different types and are removed in different ways. For proper windshield wiper blade length and type, see Maintenance Replacement Parts 0 357.
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 the vehicle 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.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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.
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, contact your dealer. 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.
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Center High-Mounted Stoplamp (CHMSL) and Cargo Lamp
1. Cargo Lamp Bulbs 2. Center High-Mounted
Stoplamp (CHMSL) Bulb
To replace one of these bulbs:
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.
Replacement Bulbs For replacement bulbs, 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 headlamp wiring checked right away if the lamps go on and off or remain off.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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. 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.
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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.
A fuse puller is available in the left instrument panel fuse block. The vehicle may not be equipped with all of the fuses, relays, and features shown.
Lift the cover to access the fuse block.
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Micro J-Case Fuses
J-Case Fuses
10
11
12
13Usage
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 Cooling Fan 1
Cooling Fan 2GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
Mini Fuses
(2 Pin)
Usage
Micro Fuses
(2 Pin)
Usage
Micro Fuses
(2 Pin)
Usage
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14
15
16
17
Trailer Stop/Turn Lamps, Left Trailer Parking Lamps Trailer Back-up Lamp Trailer Stop/Turn Lamps, Right
Micro Fuses
(2 Pin)
Usage
18
1920
21
22
23
24Fuel Pump Integrated Chassis Control Module Electronic Suspension Control Module Fuel Pump Power Module Upfitter Switch 1
Upfitter 2
Front Wiper25
26
27
2829
30
31
32
33
3435
36
37
38Antilock 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 Air Conditioning Compressor Clutch Heated Mirrors Upfitter 1
Center High-Mounted Stoplamp39
40
41
42
43
4445
46
47
48
49
50
5152
53Miscellaneous Ignition Transmission Ignition Fuel Pump 2
Cooling Fan Clutch Engine Fuel Injectors A, Odd Fuel Injectors B, Even Oxygen Sensor B Throttle Control Horn Fog Lamp Oxygen Sensor A Engine Control Module Interior Heater SpareGMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
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Micro Fuses
(2 Pin)
Usage
54
55Aeroshutter Front Washer
Micro Fuses
(3 Pin)
Usage
56
57
58
59
Air Conditioning Compressor/ Battery Regulated Voltage Control Air Conditioning Compressor Module/ Battery Pack Transmission Control Module/ Engine Control Module Headlamps
Micro Relays
60
61Usage
Fuel Pump Upfitter 2
Micro Relays
Usage
Instrument Panel Fuse Block (Right)
62
63
6465
66
67
6869
Mini Relays
70
71
Upfitter 3
Upfitter 4
Trailer Parking Lamps Run/Crank Upfitter 1
Fuel Pump 2
Air Conditioning Control StarterUsage Rear Window Defogger Engine Control Module
Solid State
Relay
Usage
72
Cooling Fan Clutch
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.
GMC Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico- 9234761) - 2016 - crc - 7/24/15
The vehicle may not be equipped with all of the fuses, relays, and features shown.
Number
Usage
Accessory Power Outlet 3
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Number
Usage
10
1518
19
20
23
2627
28
32
Accessory Power Outlet 4
Body Control Module 4
Body Control Module 8
Rear Seat Entertainment Cargo Lamp
