2021 GMC YUKON check engine light

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13690468) - 2021 - crc - 8/14/20
Vehicle Care 369
If they are, it could cause an unwanted
ground connection. You would not be
able to start your vehicle, and the bad
grounding could damage the electrical
systems.
To avoid the possibility of the vehicles
rolling, set the parking brake firmly on
both vehicles involved in the jump start
procedure. Put an automatic transmission
in P (Park) or a manual transmission in
Neutral before setting the parking brake.
If you have a four-wheel-drive vehicle, be
sure the transfer case is in a drive gear,
not in N (Neutral).
Caution
If any accessories are left on or plugged
in during the jump starting procedure,
they could be damaged. The repairs
would not be covered by the vehicle
warranty. Whenever possible, turn off or
unplug all accessories on either vehicle
when jump starting.
4. Turn the ignition off on both vehicles. Unplug unnecessary accessories plugged
into the accessory power outlets. Turn
off the radio and all the lamps that are not needed. This will avoid sparks and
help save both batteries. And it could
save the radio!
5. Open the hood on the other vehicle and locate the positive (+) and negative (−)
terminal locations on that vehicle.
The positive (+) terminal is under a red
plastic cover at the positive battery post.
To uncover the positive (+) terminal,
open the red plastic cover.
For more information on the location of
the remote positive (+) and remote
negative (−) terminals, see Engine
Compartment Overview 0312.{Warning
An electric fan can start up even when
the engine is not running and can injure
you. Keep hands, clothing, and tools
away from any underhood electric fan.
{Warning
Using a match near a battery can cause
battery gas to explode. People have been
hurt doing this, and some have been
blinded. Use a flashlight if you need
more light.
Battery fluid contains acid that can burn
you. Do not get it on you. If you
accidentally get it in your eyes or on
your skin, flush the place with water and
get medical help immediately.
{Warning
Fans or other moving engine parts can
injure you badly. Keep your hands away
from moving parts once the engine is
running.
6. Check that the jumper cables do not have loose or missing insulation. If they
do, you could get a shock. The vehicles
could be damaged too.
Before you connect the cables, here are
some basic things you should know.
Positive (+) will go to positive (+) or to a
remote positive (+) terminal if the

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13690468) - 2021 - crc - 8/14/20
376 Vehicle Care
.Use only approved cleaning solutions for
aluminum, chrome or stainless steel.
Some cleaners are highly acidic or contain
alkaline substances and can damage the
moldings.
.Always dilute a concentrated cleaner
according to the manufacturer’s
instructions.
.Do not use cleaners that are not intended
for automotive use.
.Use a nonabrasive wax on the vehicle
after washing to protect and extend the
molding finish.
Cleaning Exterior Lamps/Lenses,
Emblems, Decals, and Stripes
Use only lukewarm or cold water, a soft
cloth, and a car washing soap to clean
exterior lamps, lenses, emblems, decals, and
stripes. Follow instructions under "Washing
the Vehicle" previously in this section.
Lamp covers are made of plastic, and some
have a UV protective coating. Do not clean
or wipe them when dry.
Do not use any of the following on lamp
covers:
.Abrasive or caustic agents.
.Washer fluids and other cleaning agents
in higher concentrations than suggested
by the manufacturer.
.Solvents, alcohols, fuels, or other harsh
cleaners.
.Ice scrapers or other hard items.
.Aftermarket appearance caps or covers
while the lamps are illuminated, due to
excessive heat generated.
Caution
Failure to clean lamps properly can cause
damage to the lamp cover that would
not be covered by the vehicle warranty.
Caution
Using wax on low gloss black finish
stripes can increase the gloss level and
create a non-uniform finish. Clean low
gloss stripes with soap and water only.
Air Intakes
Clear debris from the air intakes, between
the hood and windshield, when washing the
vehicle.
Shutter System
The vehicle may have a shutter system
designed to help improve fuel economy.
Keep the shutter system clear of debris,
snow and ice. If the check engine light is
activated, please check to see if the shutter
system is clear of debris, snow or ice.
Windshield and Wiper Blades
Clean the outside of the windshield with
glass cleaner.
Clean rubber blades using a lint-free cloth or
paper towel soaked with windshield washer
fluid or a mild detergent. Wash the
windshield thoroughly when cleaning the

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13690468) - 2021 - crc - 8/14/20
Service and Maintenance 391
.Trained dealer technicians have access to
tools and equipment to inspect the brakes
and recommend quality parts engineered
for the vehicle.
Fluids
Proper fluid levels and approved fluids
protect the vehicle’s systems and
components. See Recommended Fluids and
Lubricants 0392 for GM approved fluids.
.Engine oil and windshield washer fluid
levels should be checked at every fuel fill.
.Instrument cluster lights may come on to
indicate that fluids may be low and need
to be filled.
Hoses
Hoses transport fluids and should be
regularly inspected to ensure that there are
no cracks or leaks. With a multi-point
inspection, your dealer can inspect the hoses
and advise if replacement is needed.
Lamps
Properly working headlamps, taillamps, and
brake lamps are important to see and be
seen on the road.
.Signs that the headlamps need attention
include dimming, failure to light, cracking,
or damage. The brake lamps need to be
checked periodically to ensure that they
light when braking.
.With a multi-point inspection, your dealer
can check the lamps and note any
concerns.
Shocks and Struts
Shocks and struts help aid in control for a
smoother ride.
.Signs of wear may include steering wheel
vibration, bounce/sway while braking,
longer stopping distance, or uneven
tire wear.
.As part of the multi-point inspection,
trained dealer technicians can visually
inspect the shocks and struts for signs of
leaking, blown seals, or damage, and can
advise when service is needed.
Tires
Tires need to be properly inflated, rotated,
and balanced. Maintaining the tires can save
money and fuel, and can reduce the risk of
tire failure.
.Signs that the tires need to be replaced
include three or more visible treadwear
indicators; cord or fabric showing through
the rubber; cracks or cuts in the tread or
sidewall; or a bulge or split in the tire.
.Trained dealer technicians can inspect and
recommend the right tires. Your dealer
can also provide tire/wheel balancing
services to ensure smooth vehicle
operation at all speeds. Your dealer sells
and services name brand tires.
Vehicle Care
To help keep the vehicle looking like new,
vehicle care products are available from your
dealer. For information on how to clean and
protect the vehicle’s interior and exterior,
see Interior Care 0378 and
Exterior Care 0374.
Wheel Alignment
Wheel alignment is critical for ensuring that
the tires deliver optimal wear and
performance.
.Signs that the alignment may need to be
adjusted include pulling, improper vehicle
handling, or unusual tire wear.
.Your dealer has the required equipment
to ensure proper wheel alignment.

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-13690468) - 2021 - crc - 8/14/20
418 Index
IndexA
Accessories and Modifications . . . . . . . . . . . 309
Accessory Power . . . . . . . . . . . . . . . . . . . . . . . . . 229
Adaptive Cruise Control . . . . . . . . . . . . . . . . . . 253
Add-On Electrical Equipment . . . . . . . . . . . . . 306
Additional InformationOnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
Additional Maintenance and Care . . . . . . . . 390
Adjustments Lumbar, Front Seats . . . . . . . . . . . . . . . . . . . . 40
Agreements Trademarks and License . . . . . . . . . . . . . . . 196
Air Cleaner/Filter, Engine . . . . . . . . . . . . . . . . .318
Air Conditioning . . . . . . . . . . . . . . . . . . . . 204, 207
Air Filter Life System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318
Air Filter, Passenger Compartment . . . . . . . 209
Air Suspension Four Corner . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248
Air Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Airbag System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
How Does an Airbag Restrain? . . . . . . . . . . 64
Passenger Sensing System . . . . . . . . . . . . . . 66
What Makes an Airbag Inflate? . . . . . . . . . 64
What Will You See after an AirbagInflates? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
When Should an Airbag Inflate? . . . . . . . . 63 Airbag System (cont'd)
Where Are the Airbags? . . . . . . . . . . . . . . . . 62
Airbags Adding Equipment to the Vehicle . . . . . . . 69
Passenger Status Indicator . . . . . . . . . . . . . 110
Readiness Light . . . . . . . . . . . . . . . . . . . . . . . . 109
Servicing Airbag-Equipped Vehicles . . . . . . 69
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Alarm Vehicle Security . . . . . . . . . . . . . . . . . . . . . . . . 25
Alert Lane Change . . . . . . . . . . . . . . . . . . . . . . . . . . . 272
Rear Pedestrian . . . . . . . . . . . . . . . . . . . . . . . . 266
Side Blind Zone (SBZA) . . . . . . . . . . . . . . . . . 272
All-Season Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 340
All-Terrain Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 340
AM-FM Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Antenna Multi-band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Antilock Brake System (ABS) . . . . . . . . . . . . . 240 Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Appearance Care Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378
Apple CarPlay and Android Auto . . . . . . . . . 186
Armrest Storage . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Assistance Program, Roadside . . . . . . . . . . . . 402
Assistance Systems for Driving . . . . . . . . . . 267

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-13690468) - 2021 - crc - 8/14/20
Index 419
Assistance Systems for Parking andBacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
Audio Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
Auto Stop Stop/Start System . . . . . . . . . . . . . . . . . . . . . 229
Automatic
Dimming Mirrors . . . . . . . . . . . . . . . . . . . . . . . 30
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Emergency Braking (AEB) . . . . . . . . . . . . . . 269
Headlamp System . . . . . . . . . . . . . . . . . . . . . 136
Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
Transmission Fluid . . . . . . . . . . . . . . . . . . . . . . 317
Automatic Transmission Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . 235
Avoiding Untrusted Media Devices . . . . . . . . 151
Axle, Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328
Axle, Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328
B
Battery
Exterior Lighting Battery Saver . . . . . . . . . 141
Load Management . . . . . . . . . . . . . . . . . . . . . 140
Power Protection . . . . . . . . . . . . . . . . . . . . . . . 141
Battery - North America . . . . . . . . . . . . .327, 367
Blade Replacement, Wiper . . . . . . . . . . . . . . . 329
Bluetooth Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 181, 182 Bluetooth Audio . . . . . . . . . . . . . . . . . . . . . . . . . .154
Brake
Electric Boost . . . . . . . . . . . . . . . . . . . . . . . . . . 240
Parking, Electric . . . . . . . . . . . . . . . . . . . . . . . . 240
System Warning Light . . . . . . . . . . . . . . . . . . 112
Brake Pad Life System . . . . . . . . . . . . . . . . . . . 325
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324 Antilock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
Pad Life System . . . . . . . . . . . . . . . . . . . . . . . 325
Braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214 Automatic Emergency (AEB) . . . . . . . . . . . 269
Braking System Front Pedestrian (FPB) . . . . . . . . . . . . . . . . . 270
Break-In, New Vehicle . . . . . . . . . . . . . . . . . . . . 226
Bulb Replacement
Headlamp Aiming . . . . . . . . . . . . . . . . . . . . . . 331
Buying New Tires . . . . . . . . . . . . . . . . . . . . . . . . . 351C
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 California
Perchlorate Materials
Requirements . . . . . . . . . . . . . . . . . . . . . . . . 309
California Proposition 65 Warning . . . . . . . . . . . . . . . . . . 309, 327, 367, Back Cover
Canadian Vehicle Owners . . . . . . . . . . . . . . . . . . .2
Capacities and Specifications . . . . . . . . . . . . . 396
Carbon Monoxide
Engine Exhaust . . . . . . . . . . . . . . . . . . . . . . . . 231
Liftgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Winter Driving . . . . . . . . . . . . . . . . . . . . . . . . . 221
Cargo Tie-Downs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Caution, Danger, and Warning . . . . . . . . . . . . . .2
Center Console Storage . . . . . . . . . . . . . . . . . . . .91
Chains, Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355
Charging Wireless . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Charging System Light . . . . . . . . . . . . . . . . . . . . 111
Check Engine Light (Malfunction Indicator) . . . . 111
Child Restraints Infants and Young Children . . . . . . . . . . . . . 72
Lower Anchors and Tethers forChildren . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Older Children . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Securing . . . . . . . . . . . . . . . . . . . . . . . . 84, 86, 88

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-13690468) - 2021 - crc - 8/14/20
Index 421
Driving (cont'd)Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Hill and Mountain Roads . . . . . . . . . . . . . . 220
If the Vehicle is Stuck . . . . . . . . . . . . . . . . . 221
Impaired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Loss of Control . . . . . . . . . . . . . . . . . . . . . . . . 216
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Off-Road Recovery . . . . . . . . . . . . . . . . . . . . . 215
Vehicle Load Limits . . . . . . . . . . . . . . . . . . . . 222
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Dual Automatic Climate Control
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Dynamic Fuel Management . . . . . . . . . . . . . . . 231
E
Electric Brake Boost . . . . . . . . . . . . . . . . . . . . . . 240
Electric Parking Brake . . . . . . . . . . . . . . . . . . . . 240
Electric Parking Brake Light . . . . . . . . . . . . . . . 113
Electrical Equipment, Add-On . . . . . . . . . . . . 306
Electrical System Engine Compartment Fuse Block . . . . . . . 332
Fuses and Circuit Breakers . . . . . . . . . . . . . 331
Instrument Panel Fuse Block . . . . . . . . . . . 335
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331
Rear Compartment Fuse Block . . . . . . . . . 337
Electronic Stability Control (ESC) Off Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 Emergency
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . . . . . . 318
Check Light (Malfunction Indicator) . . . . . 111
Compartment Overview . . . . . . . . . . . . . . . . 312
Coolant Temperature Gauge . . . . . . . . . . . 108
Coolant Temperature Warning Light . . . . 116
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . 319
Drive Belt Routing . . . . . . . . . . . . . . . . . . . . . 398
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324
Oil Life System . . . . . . . . . . . . . . . . . . . . . . . . 316
Oil Pressure Gauge . . . . . . . . . . . . . . . . . . . . 107
Oil Pressure Light . . . . . . . . . . . . . . . . . . . . . . . 118
Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
Power Messages . . . . . . . . . . . . . . . . . . . . . . . 125
Running While Parked . . . . . . . . . . . . . . . . . 232
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
Engine Air Filter Life System . . . . . . . . . . . . . .318
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Equipment, Towing . . . . . . . . . . . . . . . . . . . . . . 287
Event Data Recorders . . . . . . . . . . . . . . . . . . . . 409
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Extended Parking . . . . . . . . . . . . . . . . . . . . . . . . . 231
Extender, Seat Belt . . . . . . . . . . . . . . . . . . . . . . . 59
Exterior Lamp Controls . . . . . . . . . . . . . . . . . . . .134
Exterior Lamps Off Reminder . . . . . . . . . . . . 136 Exterior Lighting Battery Saver . . . . . . . . . . . 141
F
Fan
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324
Filter, Engine Air Cleaner . . . . . . . . . . . . . . . . . . . . . 318
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Flashers, Hazard Warning . . . . . . . . . . . . . . . . . 137
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355 Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356
Floor Console Storage . . . . . . . . . . . . . . . . . . . . . 92
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .381
Fluid
Automatic Transmission . . . . . . . . . . . . . . . . 317
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
Four-Wheel Drive Transfer Case . . . . . . . . 236
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324
Fog Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Forward Collision Alert (FCA) System . . . . 267
Four Corner Air Suspension Light . . . . . . . . . 117
Four Corner Air Suspension System . . . . . . 248
Four-Wheel Drive . . . . . . . . . . . . . . . . . . . .236, 327
Four-Wheel-Drive Light . . . . . . . . . . . . . . . . . . . . 114
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407
Front Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-13690468) - 2021 - crc - 8/14/20
Index 423
HVAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204, 207
I
If the System Needs Service . . . . . . . . . . . . . . 175
Ignition Positions . . . . . . . . . . . . . . . . . . . . . . . . 226
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
IndicatorPedestrian Ahead . . . . . . . . . . . . . . . . . . . . . . . 115
Vehicle Ahead . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Infants and Young Children, Restraints . . . . .72
Information Publication Ordering . . . . . . . . . . . . . . . . . . . 406
Infotainment System . . . . . . . . . . . . . . . . . . . . 409 Rear Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Instrument Cluster . . . . . . . . . . . . . . . . . . . . . . . 104
Instrument Panel Storage Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Instrument Panel Overview . . . . . . . . . . . . . . . . 4
Interior Rearview Mirrors . . . . . . . . . . . . . . . . . 30
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 1, 142
J
Jump Starting - North America . . . . . . . . . . . 367
K
Keyless Entry Remote (RKE) System . . . . . . . . . . . . . . . . . . . . 8
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
L
Labeling, Tire Sidewall . . . . . . . . . . . . . . . . . . . .341
Lamps
Daytime Running (DRL) . . . . . . . . . . . . . . . . 136
Dome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Exterior Controls . . . . . . . . . . . . . . . . . . . . . . . 134
Exterior Lamps Off Reminder . . . . . . . . . . 136
Exterior Lighting Battery Saver . . . . . . . . . 141
Malfunction Indicator (CheckEngine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
On Reminder . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Lane Change Alert (LCA) . . . . . . . . . . . . . . . . . 272
Lane Keep Assist (LKA) . . . . . . . . . . . . . . . . . . . 275
Lane Keep Assist Light . . . . . . . . . . . . . . . . . . . . 114
Lap-Shoulder Belt . . . . . . . . . . . . . . . . . . . . . . . . . 56
LATCH System Replacing Parts after a Crash . . . . . . . . . . . 83
LATCH, Lower Anchors and Tethers for
Children . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
LED Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331
Liftgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Lighting Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Illumination Control . . . . . . . . . . . . . . . . . . . 139
LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331 Lights
Airbag Readiness . . . . . . . . . . . . . . . . . . . . . . 109
Antilock Brake System (ABS)
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Brake System Warning . . . . . . . . . . . . . . . . . 112
Charging System . . . . . . . . . . . . . . . . . . . . . . . 111
Check Engine (Malfunction Indicator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Cruise Control . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Door Ajar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Driver Mode Control . . . . . . . . . . . . . . . . . . . . 116
Electric Parking Brake . . . . . . . . . . . . . . . . . . . 113
Electronic Stability Control (ESC), Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Engine Coolant Temperature Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Engine Oil Pressure . . . . . . . . . . . . . . . . . . . . . 118
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Four Corner Air Suspension . . . . . . . . . . . . . 117
Four-Wheel-Drive . . . . . . . . . . . . . . . . . . . . . . . 114
Front Fog Lamp . . . . . . . . . . . . . . . . . . . . . . . . . 119
High-Beam On . . . . . . . . . . . . . . . . . . . . . . . . . . 119
High/Low Beam Changer . . . . . . . . . . . . . . 136
Hill Descent Control . . . . . . . . . . . . . . . . . . . . 114
Lane Keep Assist . . . . . . . . . . . . . . . . . . . . . . . . 114
Low Fuel Warning . . . . . . . . . . . . . . . . . . . . . . 118
Seat Belt Reminders . . . . . . . . . . . . . . . . . . . 109
Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-13690468) - 2021 - crc - 8/14/20
426 Index
Reclining Seatbacks . . . . . . . . . . . . . . . . . . . . . . . .41
RecognitionVoice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Recommended Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
Recommended Fluids and Lubricants . . . . . 392
Records Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 395
Recreational Vehicle Towing . . . . . . . . . . . . . . 371
Reimbursement Program, GM Mobility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402
Remote Keyless Entry (RKE) System . . . . . . . 8
Remote Vehicle Start . . . . . . . . . . . . . . . . . . . . . .14
Replacement Glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
Replacement Parts
Airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
Replacing Airbag System . . . . . . . . . . . . . . . . . . 70
Replacing LATCH System Parts after a Crash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Replacing Seat Belt System Parts after a Crash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Reporting Safety Defects Canadian Government . . . . . . . . . . . . . . . . . 407
General Motors . . . . . . . . . . . . . . . . . . . . . . . . 408
U.S. Government . . . . . . . . . . . . . . . . . . . . . . . 407 Restraints
Where to Put . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Retained Accessory Power (RAP) . . . . . . . . . 229
Reverse Tilt Mirrors . . . . . . . . . . . . . . . . . . . . . . . 30
Ride Control Systems Magnetic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
Roads
Driving, Wet . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Roadside Assistance Program . . . . . . . . . . . . 402
Roof Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Roof Rack System . . . . . . . . . . . . . . . . . . . . . . . . . 93
Rotation, Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Routing, Engine Drive Belt . . . . . . . . . . . . . . . 398
Running the Vehicle While Parked . . . . . . . 232
S
Safety Defects Reporting Canadian Government . . . . . . . . . . . . . . . . . 407
General Motors . . . . . . . . . . . . . . . . . . . . . . . . 408
U.S. Government . . . . . . . . . . . . . . . . . . . . . . . 407
Safety Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Safety System Check . . . . . . . . . . . . . . . . . . . . . 59
Satellite Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Scheduling Appointments . . . . . . . . . . . . . . . . 403
Seat Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Extender . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Seat Belts (cont'd)
How to Wear Seat Belts Properly . . . . . . . 54
Lap-Shoulder Belt . . . . . . . . . . . . . . . . . . . . . . . 56
Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Replacing after a Crash . . . . . . . . . . . . . . . . . 60
Use During Pregnancy . . . . . . . . . . . . . . . . . . 59
Seats
Head Restraints . . . . . . . . . . . . . . . . . . . . . . . . . 37
Heated and Ventilated Front . . . . . . . . . . . . 44
Heated, Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Lumbar Adjustment, Front . . . . . . . . . . . . . . 40
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Power Adjustment, Front . . . . . . . . . . . . . . . 40
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Reclining Seatbacks . . . . . . . . . . . . . . . . . . . . . 41
Second Row . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Third Row Seat . . . . . . . . . . . . . . . . . . . . . . . . . 50
Second Row Seats . . . . . . . . . . . . . . . . . . . . . . . . 46
Securing Child Restraints . . . . . . . . . . 84, 86, 88
Security Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Vehicle Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210 Accessories and Modifications . . . . . . . . . 309
Doing Your Own Work . . . . . . . . . . . . . . . . . 310
Maintenance Records . . . . . . . . . . . . . . . . . . 395