
GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-12460267) - 2019 - crc - 9/11/18
Driving and Operating 287
safety chains may be provided by
the hitch manufacturer or by the
trailer manufacturer.
Cross the safety chains under the
tongue of the trailer to help prevent
the tongue from contacting the road
if it becomes separated from the
hitch. Always leave just enough
slack so the combination can turn.
Never allow safety chains to drag on
the ground.
Trailer Brakes
Loaded trailers over 900 kg
(2,000 lb) must be equipped with
brake systems and with brakes for
each axle. Trailer braking equipment
conforming to Canadian Standards
Association (CSA) requirement
CAN3-D313, or its equivalent, is
recommended.
State or local regulations may
require trailers to have their own
braking system if the loaded weight
of the trailer exceeds certain
minimums that can vary from state
to state. Read and follow the
instructions for the trailer brakes so
they are installed, adjusted, andmaintained properly. Never attempt
to tap into your vehicle's hydraulic
brake system. If you do, both the
vehicle anti-lock brakes and the
trailer brakes may not function,
which could result in a crash.
Trailer Wiring Harness
The seven-pin trailer connector is
mounted in the bumper. This
connector can be plugged into a
seven-pin universal heavy-duty
trailer connector available through
your dealer.
Use only a round, seven-wire
connector with flat blade terminals
meeting SAE J2863 specifications
for proper electrical connectivity.
The seven-wire harness contains
the following trailer circuits:
.
Yellow/Grey: Left Stop/Turn
Signal
. Green/Violet: Right Stop/Turn
Signal
. Grey/Brown: Taillamps
. White: Ground
. White/Green: Back-up Lamps .
Red/Green: Battery Feed
. Dark Blue: Trailer Brake
To help charge a remote
(non-vehicle) battery, press the Tow/
Haul Mode button at the end of the
shift lever. If the trailer is too light for
Tow/Haul Mode, turn on the
headlamps to help charge the
battery.
Electric Brake Control Wiring
Provisions
These wiring provisions are
included with the vehicle as part of
the trailer wiring package. These
provisions are for an electric brake
controller.
The harness should be installed by
your dealer or a qualified service
center.
Refer to the aftermarket electric
trailer brake controller owner's
manual to determine wire color
coding of the electric trailer brake
controller. The wire colors on the
brake controller may be different
from the vehicle.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
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294 Driving and Operating
Trailer tires deteriorate over time.
The trailer tire sidewall will show the
week and year the tire was
manufactured. Many trailer tire
manufacturers recommend
replacing tires more than six
years old.
Overloading is another leading
cause of trailer tire blow-outs. Never
load your trailer with more weight
than the tires are designed to
support. The load rating is located
on the trailer tire sidewall.
Always know the maximum speed
rating for the trailer tires before
driving. This may be significantly
lower than the vehicle tire speed
rating. The speed rating may be on
the trailer tire sidewall. If the speed
rating is not shown, the default
trailer tire speed rating is 105 km/h
(65 mph).Conversions and
Add-Ons
Add-On Electrical
Equipment
{Warning
The Data Link Connector (DLC) is
used for vehicle service and
Emission Inspection/Maintenance
testing. SeeMalfunction
Indicator Lamp (Check Engine
Light) 0153. A device connected
to the DLC —such as an
aftermarket fleet or
driver-behavior tracking device —
may interfere with vehicle
systems. This could affect vehicle
operation and cause a crash.
Such devices may also access
information stored in the vehicle’s
systems.
Caution
Some electrical equipment can
damage the vehicle or cause
components to not work and
would not be covered by the
vehicle warranty. Always check
with your dealer before adding
electrical equipment.
Add-on equipment can drain the
vehicle's 12-volt battery, even if the
vehicle is not operating.
The vehicle has an airbag system.
Before attempting to add anything
electrical to the vehicle, see
Servicing the Airbag-Equipped
Vehicle 0102 andAdding
Equipment to the Airbag-Equipped
Vehicle 0103.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
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Vehicle Care 295
Vehicle Care
General Information
General Information . . . . . . . . . . 296
California Proposition65 Warning . . . . . . . . . . . . . . . . . 296
California Perchlorate Materials Requirements . . . . . 297
Accessories and Modifications . . . . . . . . . . . . . . . . 297
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . 297
Hood . . . . . . . . . . . . . . . . . . . . . . . . . 298
Engine Compartment Overview . . . . . . . . . . . . . . . . . . . . 299
Engine Oil . . . . . . . . . . . . . . . . . . . . 302
Engine Oil Life System . . . . . . . 304
Automatic Transmission Fluid (6-Speed Transmission) . . . . . 305
Automatic Transmission Fluid (10 Speed Transmission) . . . 308
Engine Air Cleaner/Filter . . . . . . 309
Cooling System . . . . . . . . . . . . . . 310
Engine Overheating . . . . . . . . . . 313
Engine Fan . . . . . . . . . . . . . . . . . . . 315
Washer Fluid . . . . . . . . . . . . . . . . . 315
Brakes . . . . . . . . . . . . . . . . . . . . . . . 316 Brake Fluid . . . . . . . . . . . . . . . . . . . 317
Battery - North America . . . . . . 318
Four-Wheel Drive . . . . . . . . . . . . . 318
Front Axle . . . . . . . . . . . . . . . . . . . . 319
Rear Axle . . . . . . . . . . . . . . . . . . . . 320
Noise Control System . . . . . . . . 320
Starter Switch Check . . . . . . . . . 321
Automatic Transmission Shift
Lock Control Function
Check . . . . . . . . . . . . . . . . . . . . . . . 322
Ignition Transmission Lock Check . . . . . . . . . . . . . . . . . . . . . . . 322
Park Brake and P (Park) Mechanism Check . . . . . . . . . . 322
Wiper Blade Replacement . . . . 323
Glass Replacement . . . . . . . . . . 324
Windshield Replacement . . . . . 324
Gas Strut(s) . . . . . . . . . . . . . . . . . . 324
Headlamp Aiming
Headlamp Aiming . . . . . . . . . . . . 325
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . 326
High Intensity Discharge (HID) Lighting . . . . . . . . . . . . . . . . . . . . . 326
LED Lighting . . . . . . . . . . . . . . . . . 326
Fog Lamps . . . . . . . . . . . . . . . . . . . 326
Back-Up Lamps . . . . . . . . . . . . . . 327
License Plate Lamp . . . . . . . . . . 328
Electrical System
Electrical System Overload . . . 329
Fuses and Circuit Breakers . . . 329
Engine Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 330
Instrument Panel Fuse Block
(Right) . . . . . . . . . . . . . . . . . . . . . . 334
Instrument Panel Fuse Block (Left) . . . . . . . . . . . . . . . . . 337
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 339
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 341
All-Season Tires . . . . . . . . . . . . . . 342
Winter Tires . . . . . . . . . . . . . . . . . . 342
Low-Profile Tires . . . . . . . . . . . . . 342
All-Terrain Tires . . . . . . . . . . . . . . . 343
Tire Sidewall Labeling . . . . . . . . 343
Tire Designations . . . . . . . . . . . . . 344
Tire Terminology andDefinitions . . . . . . . . . . . . . . . . . . 345
Tire Pressure . . . . . . . . . . . . . . . . . 348
Tire Pressure for High-Speed Operation . . . . . . . . . . . . . . . . . . . 349
Tire Pressure Monitor System . . . . . . . . . . . . . . . . . . . . . . 349
Tire Pressure Monitor Operation . . . . . . . . . . . . . . . . . . . 350
Tire Inspection . . . . . . . . . . . . . . . . 354

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
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296 Vehicle Care
Tire Rotation . . . . . . . . . . . . . . . . . 355
When It Is Time for NewTires . . . . . . . . . . . . . . . . . . . . . . . . 356
Buying New Tires . . . . . . . . . . . . . 357
Different Size Tires and Wheels . . . . . . . . . . . . . . . . . . . . . . 358
Uniform Tire Quality Grading . . . . . . . . . . . . . . . . . . . . . 359
Wheel Alignment and Tire Balance . . . . . . . . . . . . . . . . . . . . . 360
Wheel Replacement . . . . . . . . . . 360
Tire Chains . . . . . . . . . . . . . . . . . . . 361
If a Tire Goes Flat . . . . . . . . . . . . 362
Tire Changing . . . . . . . . . . . . . . . . 363
Full-Size Spare Tire . . . . . . . . . . 373
Jump Starting
Jump Starting - North America . . . . . . . . . . . . . . . . . . . . . 374
Towing the Vehicle
Towing the Vehicle . . . . . . . . . . . 378
Recreational VehicleTowing . . . . . . . . . . . . . . . . . . . . . . 378
Appearance Care
Exterior Care . . . . . . . . . . . . . . . . . 383
Interior Care . . . . . . . . . . . . . . . . . . 388
Floor Mats . . . . . . . . . . . . . . . . . . . . 391
General Information
For service and parts needs, visit
your dealer. You will receive
genuine GM parts and GM-trained
and supported service people.
Genuine GM parts have one of
these marks:
California Proposition
65 Warning
{Warning
Most motor vehicles, including
this one, as well as many of its
service parts and fluids, contain
and/or emit chemicals known to
the State of California to cause
cancer and birth defects or other
reproductive harm. Engine
exhaust, many parts and
systems, many fluids, and some
component wear by-products
contain and/or emit these
chemicals. For more information
go to www.P65Warnings.ca.gov/
passenger-vehicle.
See Battery - North America 0318
and Jump Starting - North America
0 374 and the back cover.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
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300 Vehicle Care
1. Positive (+) Terminal. SeeJump Starting - North America
0374.
2. Battery - North America 0318.
3. Coolant Surge Tank and Pressure Cap. See Cooling
System 0310.
4. Engine Air Cleaner/Filter 0309.
5. Automatic Transmission Dipstick. See “How to Check
Automatic Transmission Fluid”
under Automatic Transmission
Fluid (6-Speed Transmission)
0 305 orAutomatic
Transmission Fluid (10 Speed
Transmission) 0308.
6. Remote Negative (–) Location (Out of View). See Jump
Starting - North America 0374.
7. Engine Cooling Fans (Out of View). See Cooling System
0 310.
8. Engine Oil Fill Cap. See “When
to Add Engine Oil” under
Engine Oil 0302. 9. Engine Oil Dipstick. See
“Checking Engine Oil” under
Engine Oil 0302.
10. Windshield Washer Fluid Reservoir. See “Adding Washer
Fluid” under Washer Fluid
0 315.
11. Brake Fluid Reservoir. See Brake Fluid 0317.
12. Engine Compartment Fuse
Block 0330.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
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302 Vehicle Care
1. Positive (+) Terminal. SeeJump Starting - North America
0374.
2. Battery - North America 0318.
3. Coolant Surge Tank and Pressure Cap. See Cooling
System 0310.
4. Engine Air Cleaner/Filter 0309.
5. Remote Negative (–) Location (Out of View). See Jump
Starting - North America 0374.
6. Engine Cooling Fans (Out of View). See Cooling System
0 310.
7. Engine Oil Fill Cap. See “When
to Add Engine Oil” under
Engine Oil 0302.
8. Engine Oil Dipstick. See “Checking Engine Oil” under
Engine Oil 0302.
9. Windshield Washer Fluid Reservoir. See “Adding Washer
Fluid” under Washer Fluid
0 315.
10. Brake Fluid Reservoir. See Brake Fluid 0317. 11.
Engine Compartment Fuse
Block 0330.
Engine Oil
To ensure proper engine
performance and long life, careful
attention must be paid to engine oil.
Following these simple, but
important steps will help protect
your investment:
.
Use engine oil approved to the
proper specification and of the
proper viscosity grade. See
“Selecting the Right Engine Oil”
in this section.
. Check the engine oil level
regularly and maintain the
proper oil level. See “Checking
Engine Oil” and“When to Add
Engine Oil” in this section.
. Change the engine oil at the
appropriate time. See Engine Oil
Life System 0304.
. Always dispose of engine oil
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.
Check the oil level before filling to
the recommended level. If the oil is
not low and this message remains
on, see your dealer.
Check the engine oil level regularly,
every 650 km (400 mi), especially
prior to a long trip. The engine oil
dipstick handle is a loop. See
Engine Compartment Overview
0299 for the location.
{Warning
The engine oil dipstick handle
may be hot; it could burn you.
Use a towel or glove to touch the
dipstick handle.
Follow these guidelines:
. To get an accurate reading, park
the vehicle on level ground.
Check the engine oil level after
the engine has been off for at
least two hours. Checking the

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
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318 Vehicle Care
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
0299 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
(Continued)
Warning (Continued)
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. For more information
go to www.P65Warnings.ca.gov/
passenger-vehicle.
See California Proposition
65 Warning 0296 and the back
cover.
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 0374 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.
Four-Wheel Drive
Transfer Case
When to Check Lubricant
Refer to
Maintenance Schedule
0 395 to determine when to check
the lubricant.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
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332 Vehicle Care
FusesUsage
4 Passenger motorized seat belt
5 Suspension leveling
compressor
6 4WD transfer case electronic control
7 –
8 –
10 Electric parking brake/–
11 –
12 –
13 Interior BEC LT2
14 Rear BEC 1
15 –
16 –
17 Driver motorized seat belt
18 –
19 –
20 – Fuses
Usage
21 Automatic headlamp leveling/
Exhaust solenoid
22 Fuel pump
23 Integrated chassis control module
24 Real time dampening
25 Fuel pump power module
26 Active Hydraulic Assist/ Battery
regulated voltage
control
27 –
28 Upfitter 2
30 Wiper
31 Trailer interface module
32 –
33 –
34 Reverse lamps Fuses
Usage
35 Antilock brake system valve
36 Trailer brakes
38 –
39 Right trailer stoplamp/Turn
signal lamp
40 Left trailer stoplamp/turn
signal lamp
41 Trailer parking lamps
42 Right parking lamps
43 Left parking lamps
44 Upfitter 3
45 Automatic level control/Run/Crank
46 –
47 Upfitter 4
49 Reverse lamps
50 –