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properly. See “What to Do with Used Oil” in this section.
Checking Engine Oil If equipped, the ENGINE OIL LOW ADD OIL message displays when the engine oil level may be too low. See Engine Oil Messages on page 5-34. Check the oil level before filling to the recommended level. If the oil is not low and this message remains on, see your dealer. It is also a good idea to check the engine oil level at each fuel fill. In order to get an accurate reading, the vehicle must be on level ground. The engine oil dipstick handle is a loop. See Engine Compartment Overview on page 10-5 for the location of the engine oil dipstick.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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Obtaining an accurate oil level reading is essential: 1.
If the engine has been running recently, turn off the engine and allow several minutes for the oil to drain back into the oil pan. Checking the oil level too soon after engine shutoff will not provide an accurate oil level reading.
{ Warning
The engine oil dipstick handle may be hot; it could burn you. Use a towel or glove to touch the dipstick handle.
2. Pull out the dipstick and wipe it
with a clean paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level.
When to Add Engine Oil
If the oil is below the cross-hatched area at the tip of the dipstick, add 1 L (1 qt) of the recommended oil and then recheck the level. See “Selecting the Right Engine Oil” in this section for an explanation of what kind of oil to use. For engine oil crankcase capacity, see Capacities and Specifications on page 12-2.
{ Caution
Do not add too much oil. Oil levels above or below the acceptable operating range shown on the dipstick are harmful to the engine. If you find that you
(Continued)
Vehicle Care
10-7
Caution (Continued)
have an oil level above the operating range, i.e., the engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, the engine could be damaged. You should drain out the excess oil or limit driving of the vehicle and seek a service professional to remove the excess amount of oil.
See Engine Compartment Overview on page 10-5 for the location of the engine oil fill cap. Add enough oil to put the level somewhere in the proper operating range. Push the dipstick all the way back in when through.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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Vehicle Care
Selecting the Right Engine Oil Selecting the right engine oil depends on both the proper oil specification and viscosity grade. See Recommended Fluids and Lubricants on page 11-12.
Specification Ask for and use engine oils that meet the dexos1™ specification. Engine oils that have been approved by GM as meeting the dexos1 specification are marked with the dexos1 approved logo. See www.gmdexos.com.
{ Caution
Failure to use the recommended engine oil can result in engine damage not covered by the vehicle warranty. Check with your dealer or service provider on whether the oil is approved to the dexos1 specification.
Viscosity Grade Use SAE 0W-20 viscosity grade engine oil. When selecting an oil of the appropriate viscosity grade, always select an oil of the correct specification. See “Specification” earlier in this section for more information.
Engine Oil Additives/Engine Oil Flushes Do not add anything to the oil. The recommended oils meeting the dexos1 specification are all that is needed for good performance and 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
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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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.
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. On some vehicles, 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 on page 5-34. 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 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. For vehicles without the CHANGE ENGINE OIL SOON message, an oil change is needed when the OIL LIFE REMAINING percentage is near 0%. 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.
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10-9
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 OIL LIFE
REMAINING on the DIC. If the vehicle does not have DIC buttons, the vehicle must be in P (Park) to access this display. See Driver Information Center (DIC) on page 5-28.
2. Press and hold V, or the trip
odometer reset stem if the vehicle does not have DIC buttons, for several seconds. The oil life will change to 100%. The oil life system can also be reset as follows: 1. Turn the ignition to ON/RUN with
the engine off.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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Vehicle Care
2. Fully press the accelerator pedal
slowly three times within five seconds.
3. Display the OIL LIFE
REMAINING on the DIC. If the display shows 100%, the system is reset.
If the vehicle has a CHANGE ENGINE OIL SOON message and it comes back on when the vehicle is started and/or the OIL LIFE REMAINING is near 0%, the engine oil life system has not been 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, 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 on page 11-12.
Change the fluid and filter at the scheduled maintenance intervals listed in Maintenance Schedule on page 11-2. Be sure to use the transmission fluid listed in Recommended Fluids and Lubricants on page 11-12.
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,
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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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) on page 5-28.
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.
Vehicle Care
10-11
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.
Cold Check Procedure Use this procedure only as a reference to determine if the transmission has enough fluid to be 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).
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.1. Locate the transmission dipstick
at the rear of the engine compartment, on the passenger side of the vehicle. See Engine Compartment Overview on page 10-5.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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Vehicle Care
6. Perform a hot check at the first
7.
opportunity after the transmission reaches a normal operating temperature between 71°C to 93°C (160°F to 200°F). 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.
1. Locate the transmission dipstick
at the rear of the engine compartment, on the passenger side of the vehicle. See Engine Compartment Overview on page 10-5.
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.
6.
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 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.GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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How to Inspect the Engine Air Cleaner/Filter To inspect the air cleaner/filter, remove the engine air cleaner/filter from the vehicle by following Steps 1-8. When the engine air cleaner/filter is removed, lightly shake it to release loose dust and dirt. If the engine air cleaner/filter remains covered with dirt, a new filter is required. Never use compressed air to clean the filter.
Replacing the Engine Air Cleaner/ Filter
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.
Engine Air Cleaner/Filter See Engine Compartment Overview on page 10-5 for the location of the engine air cleaner/filter. When to Inspect the Engine Air Cleaner/Filter Inspect the air cleaner/filter at the scheduled maintenance intervals and replace it at the first oil change after each 80 000 km (50,000 mi) interval. See Maintenance Schedule on page 11-2. If driving in dusty/dirty conditions, inspect the filter at each engine oil change.
Vehicle Care
10-13
1. Screws (4) 2. Electrical Connector 3. Air Duct Clamp
1. Locate the air cleaner/filter
assembly. See Engine Compartment Overview on page 10-5.
2. Disconnect the outlet duct by
loosening the air duct clamp (3).
3. Disconnect the electrical
connector (2) and the connector harness from the cover.
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.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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Vehicle Care
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.
{ 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. Coolant Surge Tank 2. Coolant Surge Tank
Pressure Cap
3. Engine Electric Cooling Fan(s)
{ 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.
{ 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.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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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.
{ 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.
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 on page 10-18.
Vehicle Care
10-15
Use a 50/50 mixture of clean, drinkable water and DEX-COOL coolant. If using this mixture, nothing else needs to be added. This mixture: . Gives freezing protection down
to −37°C (−34°F), outside temperature.
. Gives boiling protection up to
129°C (265°F), engine temperature.
. Protects against rust and
corrosion.
. Will not damage aluminum parts. . Helps keep the proper engine
temperature.
{ Caution
If improper coolant mixture, inhibitors, or additives are used in the vehicle cooling system, the engine could overheat and be damaged. Too much water in the
(Continued)
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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Vehicle Care
Caution (Continued)
mixture can freeze and crack engine cooling parts. The repairs would not be covered by the vehicle warranty. Use only the proper mixture of engine coolant for the cooling system. See Recommended Fluids and Lubricants on page 11-12.
Never dispose of engine coolant by putting it in the trash, or by pouring it on the ground, or into sewers, streams, or bodies of water. Have the coolant changed by an authorized service center, familiar with legal requirements regarding used coolant disposal. This will help protect the environment and your health.
Checking Coolant The coolant surge tank is in the engine compartment on the passenger side of the vehicle. See Engine Compartment Overview on page 10-5. The vehicle must be on a level surface when checking the coolant level. Check to see if coolant is visible in the coolant surge tank. If the coolant inside the coolant surge tank is boiling, wait until it cools down. The coolant level should be at or above the FULL COLD mark. If it is not, there may be a leak in the cooling system. If coolant is visible but the coolant level is not at or above the FULL COLD mark, see “How to Add Coolant to the Coolant Surge Tank,” following.
How to Add Coolant to the Coolant Surge Tank
{ 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.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (17,1)
{ 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.
If no coolant is visible in the surge tank, add coolant.
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.
Vehicle Care
10-17
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.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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Vehicle Care
{ 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
{ Caution
Running the engine without coolant may cause damage or a fire. Vehicle damage would not be covered by the vehicle warranty.
The vehicle has several indicators to warn of engine overheating. There is a coolant temperature gauge in the vehicle's instrument cluster. See Engine Coolant Temperature Gauge on page 5-16.
In addition, there are ENGINE OVERHEATED STOP ENGINE, ENGINE OVERHEATED IDLE ENGINE, and ENGINE POWER IS REDUCED messages in the Driver Information Center (DIC). See Engine Cooling System Messages on page 5-33 and Engine Power Messages on page 5-35. If the decision is made not to lift the hood when this warning appears, get service help right away. If the decision is made to lift the hood, make sure the vehicle is parked on a level surface. Check to see if the engine cooling fan(s) are running. If the engine is overheating, the fans should be running. If they are not, do not continue to run the engine and have the vehicle serviced.
If Steam is Coming from the Engine Compartment { Warning
Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming from it. Just turn it off and get everyone away from the vehicle until it cools down. Wait until there is no sign of steam or coolant before you open the hood. If you keep driving when the engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop the engine if it overheats, and get out of the vehicle until the engine is cool.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (19,1)
If No Steam is Coming from the Engine Compartment The ENGINE OVERHEATED STOP ENGINE or the ENGINE OVERHEATED IDLE ENGINE message, along with a low coolant condition, can indicate a serious problem. If there is an engine overheat warning, but no steam is seen or heard, the problem may not be too serious. Sometimes the engine can get a little too hot when the vehicle: . Climbs a long hill on a hot day. . Stops after high-speed driving. Idles for long periods in traffic. Tows a trailer; see Trailer Towing on page 9-77.
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.
Vehicle Care
10-19
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.
Engine Fan 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
2. Turn the heater on to the highest
temperature and to the highest fan speed. Open the windows as necessary.
3. When it is safe to do so, pull off
the road, shift to P (Park) or N (Neutral), and let the engine idle.
If the temperature overheat gauge is no longer in the overheat zone or an overheat warning no longer displays, the vehicle can be driven. Continue to drive the vehicle slowly for about 10 minutes. Keep a safe vehicle distance from the vehicle in front. If the warning does not come back on, continue to drive normally and have the cooling system checked for proper fill and function. 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
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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Vehicle Care
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.
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 on page 10-5 for reservoir location.
{ Caution
. Do not use engine coolant
(antifreeze) in the windshield washer. It can damage the windshield washer system and paint.
. Do not mix water with
ready-to-use washer fluid. Water can cause the solution
(Continued)
Caution (Continued)
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 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.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (21,1)
{ Warning
The brake wear warning sound means that soon the brakes will not work well. That could lead to a crash. When the brake wear warning sound is heard, have the vehicle serviced.
{ Caution
Continuing to drive with worn-out brake pads could result in costly brake repair.
Some driving conditions or climates can cause a brake squeal when the brakes are first applied or lightly applied. This does not mean something is wrong with the brakes. 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 on page 12-2. 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.
Vehicle Care
10-21
Brake Fluid
The brake master cylinder reservoir is filled with DOT 3 brake fluid. See Engine Compartment Overview on page 10-5 for the location of the reservoir. There are only two reasons why the brake fluid level in the reservoir might go down:
The brake fluid level goes down because of normal brake lining wear. When new linings are installed, the fluid level goes back up.
. A fluid leak in the brake
hydraulic system can also cause a low fluid level. Have the brake hydraulic system fixed, since a leak means that sooner or later the brakes will not work well.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
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Vehicle Care
Do not top off the brake fluid. Adding fluid does not correct a leak. If fluid is added when the linings are worn, there will be too much fluid when new brake linings are installed. Add or remove brake fluid, as necessary, only when work is done on the brake hydraulic system.
{ Warning
Refer to the Maintenance Schedule to determine when to check the brake fluid. See Maintenance Schedule on page 11-2. Checking Brake Fluid Check brake fluid by looking at the brake fluid reservoir. See Engine Compartment Overview on page 10-5.
If too much brake fluid is added, it can spill on the engine and burn, if the engine is hot enough. You or others could be burned, and the vehicle could be damaged. Add brake fluid only when work is done on the brake hydraulic system. See “Checking Brake Fluid” in this section.
When the brake fluid falls to a low level, the brake warning light comes on. See Brake System Warning Light on page 5-22.
The fluid level should be above MIN. If it is not, have the brake hydraulic system checked to see if there is a leak.
After work is done on the brake hydraulic system, make sure the level is above MIN but not over the MAX mark.
What to Add Use only new DOT 3 brake fluid from a sealed container. See Recommended Fluids and Lubricants on page 11-12. Always clean the brake fluid reservoir cap and the area around the cap before removing it. This helps keep dirt from entering the reservoir.
{ Warning
With the wrong kind of fluid in the brake hydraulic system, the brakes might not work well. This could cause a crash. Always use the proper brake fluid.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (23,1)
{ Caution
. Using the wrong fluid can
badly damage brake hydraulic system parts. For example, just a few drops of mineral-based oil, such as engine oil, in the brake hydraulic system can damage brake hydraulic system parts so badly that they will have to be replaced. Do not let someone put in the wrong kind of fluid.
. If brake fluid is spilled on the
vehicle's painted surfaces, the paint finish can be damaged. Be careful not to spill brake fluid on the vehicle. If you do, wash it off immediately.
Battery The original equipment battery is maintenance free. Do not remove the cap and do not add fluid. Refer to the replacement number on the original battery label when a new battery is needed. See Engine Compartment Overview on page 10-5 for battery location.
{ Warning
Battery posts, terminals, and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm. Wash hands after handling.
Vehicle Care
10-23
Vehicle Storage
{ Warning
Batteries have acid that can burn you and gas that can explode. You can be badly hurt if you are not careful. See Jump Starting on page 10-78 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.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (24,1)
10-24
Vehicle Care
Four-Wheel Drive
Transfer Case
When to Check Lubricant Refer to Maintenance Schedule on page 11-2 to determine when to check the lubricant.
How to Check Lubricant
Automatic Transfer Case
1. Fill Plug 2. Drain Plug
Front Axle
When to Check and Change Lubricant It is not necessary to regularly check front axle fluid unless a leak is suspected, or an unusual noise is heard. A fluid loss could indicate a problem. Have it inspected and repaired.
How to Check Lubricant To get an accurate reading, the vehicle should be on a level surface.
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 on page 11-2 to determine how often to change the lubricant.
What to Use Refer to Recommended Fluids and Lubricants on page 11-12 to determine what kind of lubricant to use.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (25,1)
What to Use Refer to Recommended Fluids and Lubricants on page 11-12 to determine what kind of lubricant to use.
Rear Axle
When to Check Lubricant It is not necessary to regularly check rear axle fluid unless a leak is suspected or an unusual noise is heard. A fluid loss could indicate a problem. Have it inspected and repaired. All axle assemblies are filled by volume of fluid during production. They are not filled to reach a certain level. When checking the fluid level on any axle, variations in the readings can be caused by factory fill differences between the minimum and the maximum fluid volume. Also, if a vehicle has just been driven before checking the fluid level, it may appear lower than normal because fluid has traveled
Vehicle Care
10-25
out along the axle tubes and has not drained back to the sump area. Therefore, a reading taken five minutes after the vehicle has been driven will appear to have a lower fluid level than a vehicle that has been stationary for an hour or two. The rear axle assembly must be supported on a flat, level surface to get a true reading. How to Check Lubricant
To get an accurate reading, the vehicle should be on a level surface.
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.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (26,1)
10-26
Vehicle Care
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. What to Use Refer to Recommended Fluids and Lubricants on page 11-12 to determine what kind of lubricant to use.
Noise Control System The following information relates to compliance with federal noise emission standards for vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 4 536 kg (10,000 lb). The noise control system warranty is given in your warranty manual. These standards apply only to vehicles sold in the United States.
Federal law prohibits the following acts or the causing thereof: 1. The removal or rendering
inoperative by any person, other than for purposes of maintenance, repair or replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control, prior to its sale or delivery to the ultimate purchaser or while it is in use; or 2. The use of the vehicle after such device or element of design has been removed or rendered inoperative by any person. Among those acts presumed to constitute tampering are the acts listed below.
Insulation: Removal of the noise shields or any underhood insulation.
Engine: Removal or rendering engine speed governor, if the vehicle has one, inoperative so as to allow engine speed to exceed manufacturer specifications.
Fan and Drive: . Removal of fan clutch, if the
vehicle has one, or rendering clutch inoperative.
. Removal of the fan shroud, if the
vehicle has one.
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.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (27,1)
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
Vehicle Care
10-27
normal effort. If the shift lever moves out of P (Park), contact your dealer for service.
Ignition Transmission Lock Check If equipped with a key type ignition, while parked and with the parking brake set, try to turn the ignition to LOCK/OFF in each shift lever position.
The ignition should turn to LOCK/OFF only when the shift lever is in P (Park). The ignition key should come out only in LOCK/OFF.
Contact your dealer if service is required.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (28,1)
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Vehicle Care
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 or cracking. For the proper type and size, see Maintenance Replacement Parts on page 11-13. Front Wiper Blade Replacement To replace the wiper blade assembly: 1. Pull the windshield wiper assembly away from the windshield.
2. Lift up on the latch in the middle
of the wiper blade where the wiper arm attaches.
3. With the latch open, pull the wiper blade down toward the windshield far enough to release it from the J-hooked end of the wiper arm.
4. Remove the wiper blade.
Allowing the wiper blade 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
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (29,1)
Vehicle Care
10-29
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.
warranty. Do not allow the wiper blade arm to touch the windshield.
5. Reverse Steps 1–3 for wiper
blade replacement.
Rear Wiper Blade Replacement To replace the rear wiper blade: 1. Pull the wiper blade assembly
away from the backglass. The rear wiper blade will not lock in a vertical position so care should be used when pulling it away from the vehicle.
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 in the wiper arm hook until the release lever clicks into place.
4. Return the wiper arm and blade assembly to the rest position on the glass.
Glass Replacement If the windshield or front side glass must be replaced, see your dealer to determine the correct replacement glass.
Windshield Replacement The windshield is part of the HUD system. If the vehicle has to have the windshield replaced, get one that is designed for HUD or the HUD image may look out of focus.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (30,1)
10-30
Vehicle Care
Bulb Replacement For the proper type of replacement bulbs, see Replacement Bulbs on page 10-33. For any bulb‐changing procedure not listed in this section, contact your dealer.
High Intensity Discharge (HID) Lighting
{ Warning
The high intensity discharge lighting system operates at a very high voltage. If you try to service any of the system components, you could be seriously injured. Have your dealer or a qualified technician service them.
After an HID headlamp bulb has been replaced, the beam might be a slightly different shade than it was originally. This is normal.
LED Lighting This vehicle has several LED lamps. For replacement of any LED lighting assembly, contact your dealer.
Headlamps
Driver Side 1. Low-Beam Headlamp 2. High-Beam Headlamp See your dealer for passenger side replacement.
Headlamp 1. Open the hood. See Hood on
page 10-4
2. Remove the headlamp bulb assembly cover by turning it counterclockwise.
3. Turn the bulb socket
counterclockwise to remove it from the headlamp assembly and pull it straight out.
4. Unplug the electrical connector
from the old bulb by releasing the clip on the bulb socket.
Front Turn Signal Lamps 1. Open the hood. See Hood on
page 10-4
2. Reach in and access the bulb socket from inside the engine compartment.
3. Turn the bulb socket
counterclockwise to remove it from the headlamp assembly and pull it straight out.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (31,1)
Vehicle Care
10-31
The taillamp on this vehicle is an LED. For replacement, contact your dealer. To replace one of these bulbs: 1. Open the liftgate. See Liftgate
on page 2-19.
4. Remove the bulb by pulling it straight out of the socket bulb socket.
5. Replace it with a new bulb. 6. Reinstall the new bulb socket
into the headlamp assembly and turn it clockwise to secure.
Taillamps, Turn Signal, Stoplamps, and Back-Up Lamps
2. Remove the taillamp closeout cover from the lamp assembly by pulling rearward from the top and bottom at the same time to unfasten the snap tabs.
1. Back-up Lamp 2. Stoplamp/Turn Signal Lamp
3. Remove the two screws from the
taillamp assembly.
4. Pull the taillamp assembly
straight back to remove.
5. Turn the bulb socket
counterclockwise to remove it from the taillamp assembly.
6. Pull the bulb straight out from
the socket.
7. Press a new bulb into the
socket, insert it into the taillamp assembly, and turn the bulb socket clockwise until it clicks.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (32,1)
10-32
Vehicle Care
8. Reinstall the taillamp assembly
and tighten the screws.
9. Reinstall the taillamp cover by
snapping it into place.
License Plate Lamp
Passenger Side Shown, Driver
Side Similar
1. Bulb Socket 2. Bulb 3. Lamp Assembly
To replace one of these bulbs: 1. Push the lamp assembly (3)
toward the center of the vehicle. 2. Pull the lamp assembly down to
remove.
3. Turn the bulb socket (1)
counterclockwise to remove it from the lamp assembly (3).
4. Pull the bulb (2) straight out of
the bulb socket (1).
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (33,1)
5. Push the replacement bulb
straight into the bulb socket and turn the bulb socket clockwise to install it into the lamp assembly.
6. Push the lamp assembly back
into position until the release tab locks into place.
Replacement Bulbs
Exterior Lamp
Back-up Lamp High-Beam Headlamp Low-Beam Headlamp License Plate Lamp
Bulb
Number
921
9005 LL
H11 LL
W5W
For replacement bulbs not listed here, contact your dealer.
Electrical System
Electrical System Overload The vehicle has fuses to protect against an electrical system overload. Fuses also protect power devices in the vehicle. Replace a bad fuse with a new one of the identical size and rating. If there is a problem on the road and a fuse needs to be replaced, there are some spare fuses and a fuse puller in the Instrument Panel Fuse Block. The same amperage fuse can also be borrowed. Choose some feature of the vehicle that is not needed to use and replace it as soon as possible. Headlamp Wiring An electrical overload may cause the lamps to go on and off, or in some cases to remain off. Have the
Vehicle Care
10-33
headlamp wiring checked right away if the lamps go on and off or remain off. Windshield Wipers If the wiper motor overheats due to heavy snow or ice, the windshield wipers will stop until the motor cools and will then restart. Although the circuit is protected from electrical overload, overload due to heavy snow or ice may cause wiper linkage damage. Always clear ice and heavy snow from the windshield before using the windshield wipers. If the overload is caused by an electrical problem and not snow or ice, be sure to get it fixed.
Fuses The wiring circuits in the vehicle are protected from short circuits by fuses. This greatly reduces the chance of fires caused by electrical problems.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (34,1)
10-34
Vehicle Care
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 The engine compartment fuse block is in the engine compartment, on the driver side of the vehicle.
Lift the cover to access the fuse block.
{ Caution
Spilling liquid on any electrical component on the vehicle may damage it. Always keep the covers on any electrical component.
A fuse puller is available in the left instrument panel fuse block.
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (35,1)
Vehicle Care
10-35
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (36,1)
10-36
Vehicle Care
Item
Usage
10
13
14
17
2123
Electric Running Boards Antilock Brake System Pump Interior BEC LT1
MBS Passenger Suspension Leveling Compressor 4WD Transfer Case Electronic Control Electric Parking Brake Interior BEC LT2
Rear BEC 1
MBS Driver ALC Exhaust Solenoid Integrated Chassis Control ModuleItem 24
25
26
28
29
30
31
34
3536
37
3940
Usage
Real Time Dampening Fuel Pump Power Module Spare/Battery Regulated Voltage Control Upfitter 2
Upfitter 2 Relay Wiper TIM Back-up Lamps Antilock Brake System Valve Trailer Brakes Upfitter 3 Relay Trailer Stop/Turn Right Trailer Stop/ Turn LeftItem 41
4243
44
4547
48
49
5159
6063
67
69
70Usage
Trailer Park Lamps Right Parking Lamps Left Parking Lamps Upfitter 3
Automatic Level Control Run/Crank Upfitter 4
Upfitter 4 Relay Reverse Lamps Parking Lamp Relay Euro Trailer Air Conditioning Control Upfitter 1
Trailer Battery RC Upfitter 3 and 4
VBAT Upfitter 3 and 4GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (37,1)
Vehicle Care
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Item 109
112
114115
116
121122
123Usage Police Upfitter Starter Relay Front Windshield Washer Rear Window Washer Cooling Fan Left Right HID Headlamp Left HID Headlamp Cooling Fan Right
Item 72
7475
76
77
7883
84
87
88
89
90
91Usage
Upfitter 1 Relay Engine Control Module Ignition Miscellaneous Ignition Spare Transmission Ignition RC Upfitter 1 and 2
VBAT Upfitter 1 and 2
Euro Trailer RC Run/Crank Relay Engine Injector A – Odd Injector B – Even Oxygen Sensor B Throttle ControlItem 92
93
94
95100
101102
103
104
107Usage
Engine Control Module Relay Horn Fog Lamps High-Beam Headlamps Oxygen Sensor A Engine Control Module Engine Control Module/ Transmission Control Module Auxiliary Interior Heater Starter Aero Shutter
GMC 2015i Yukon/Yukon XL Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8431503) - 2015 - crc - 8/11/14
Black plate (38,1)
10-38
Vehicle Care
Instrument Panel Fuse Block (Left)
The left instrument panel fuse block access door is on the driver side edge of the instrument panel. Pull off the cover to access the fuse block.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
Number
Usage
