
GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-11349177) - 2018 - CRC - 10/17/17
414 Vehicle Care If a front tire fails, the flat tire
creates a drag that pulls the vehicle
toward that side. Take your foot off
the accelerator pedal and grip the
steering wheel firmly. Steer to
maintain lane position, and then
gently brake to a stop, well off the
road, if possible.
A rear blowout, particularly on a
curve, acts much like a skid and
may require the same correction as
used in a skid. Stop pressing the
accelerator pedal and steer to
straighten the vehicle. It may be
very bumpy and noisy. Gently brake
to a stop, well off the road,
if possible.
{ Warning
Driving on a flat tire will cause
permanent damage to the tire.
Re-inflating a tire after it has been
driven on while severely
underinflated or flat may cause a
blowout and a serious crash.
Never attempt to re-inflate a tire
(Continued) Warning (Continued) that has been driven on while
severely underinflated or flat.
Have your dealer or an authorized
tire service center repair or
replace the flat tire as soon as
possible.
{ WarningLifting a vehicle and getting under
it to do maintenance or repairs is
dangerous without the
appropriate safety equipment and
training. If a jack is provided with
the vehicle, it is designed only for
changing a flat tire. If it is used for
anything else, you or others could
be badly injured or killed if the
vehicle slips off the jack. If a jack
is provided with the vehicle, only
use it for changing a flat tire. If a tire goes flat, avoid further tire
and wheel damage by driving slowly
to a level place, well off the road,
if possible. Turn on the hazard
warning flashers. See Hazard
Warning Flashers 0 180 .
{ WarningChanging a tire can be
dangerous. The vehicle can slip
off the jack and roll over or fall
causing injury or death. Find a
level place to change the tire. To
help prevent the vehicle from
moving:
1. Set the parking brake firmly.
2. Put an automatic
transmission in P (Park) or a
manual transmission in
1 (First) or R (Reverse).
3. For four-wheel-drive
vehicles, be sure the
transfer case is in a drive
gear – not in N (Neutral).
(Continued) 

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-11349177) - 2018 - CRC - 10/17/17
Vehicle Care 415Warning (Continued) 4. Turn off the engine and do
not restart while the vehicle
is raised.
5. Do not allow passengers to
remain in the vehicle.
6. Place wheel blocks,
if equipped, on both sides of
the tire at the opposite
corner of the tire being
changed.
When the vehicle has a flat tire (2),
use the following example as a
guide to assist in the placement of
the wheel blocks (1), if equipped.
1. Wheel Block (If Equipped) 2. Flat Tire
The following information explains
how to use the jack and change
a tire.
Tire Changing Removing the Spare Tire and
Tools
Crew Cab
1. Wheel Blocks
2. Wing Nut Retaining Wheel
Blocks
3. Tool Kit
4. Wing Nut Retaining Tool Kit
5. Jack 6. Jack Knob
Regular Cab
1. Wing Nut Retaining Wheel
Blocks
2. Wheel Blocks
3. Wing Nut Retaining Tool Kit
4. Tool Kit
5. Jack
6. Jack Knob 

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-11349177) - 2018 - CRC - 10/17/17
Service and Maintenance 453(2) Visually check all fuel and vapor
lines and hoses for proper
attachment, connection, routing, and
condition.
(3) Or every four years, whichever
comes first. If driving in dusty
conditions, inspect the filter at each
oil change or more often as needed.
(4) Do not directly power wash the
transfer case and/or front/rear axle
output seals. High pressure water
can overcome the seals and
contaminate the transfer case fluid.
Contaminated fluid will decrease the
life of the transfer case and/or axles
and should be replaced.
(5) Or every five years, whichever
comes first. See Cooling System
0 359 .
(6) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage;
replace, if needed.
(7) Replace brake fluid every five
years. See Brake Fluid 0 368 .Special Application
Services .
Vehicles with Dual Wheels:
Check dual wheel nut torque at
160, 1 600, and 10 000 km (100,
1,000, and 6,000 mi) of driving.
Repeat this service whenever a
tire/wheel is serviced or
removed.
.
Severe Commercial Use
Vehicles Only: Lubricate chassis
components every oil change.
.
Have underbody flushing service
performed. See “ Underbody
Maintenance ” in Exterior Care
0 435 .Additional
Maintenance and Care Your vehicle is an important
investment and caring for it properly
may help to avoid future costly
repairs. To maintain vehicle
performance, additional
maintenance services may be
required.
It is recommended that your dealer
perform these services — their
trained dealer technicians know
your vehicle best. Your dealer can
also perform a thorough
assessment with a multi-point
inspection to recommend when your
vehicle may need attention.
The following list is intended to
explain the services and conditions
to look for that may indicate
services are required. 

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-11349177) - 2018 - CRC - 10/17/17
Customer Information 469
GM Mobility
Reimbursement Program
This program is available to
qualified applicants for cost
reimbursement, up to certain limits,
of eligible aftermarket adaptive
equipment required for the vehicle,
such as hand controls or a
wheelchair/scooter lift for the
vehicle.
To learn about the GM Mobility
program, see www.gmmobility.com
or call the GM Mobility Assistance
Center at 1-800-323-9935. Text
Telephone (TTY) users, call
1-800-833-9935.
General Motors of Canada also has
a Mobility program. See www.gm.ca
or call 1-800-GM-DRIVE
(800-463-7483) for details. TTY
users call 1-800-263-3830. Roadside Assistance
Program For U.S.-purchased vehicles, call
1-888-881-3302; (Text Telephone
(TTY): 1-888-889-2438).
For Canadian-purchased vehicles,
call 1-800-268-6800.
Service is available 24 hours a day,
365 days a year.
Calling for Assistance When calling Roadside Assistance,
have the following information
ready:
.
Your name, home address, and
home telephone number
.
Telephone number of your
location
.
Location of the vehicle
.
Model, year, color, and license
plate number of the vehicle
.
Odometer reading, Vehicle
Identification Number (VIN), and
delivery date of the vehicle
.
Description of the problem Coverage Services are provided for the
duration of the vehicle's powertrain
warranty.
In the U.S., anyone driving the
vehicle is covered. In Canada, a
person driving the vehicle without
permission from the owner is not
covered.
Roadside Assistance is not a part of
the New Vehicle Limited Warranty.
General Motors North America and
GMC reserve the right to make any
changes or discontinue the
Roadside Assistance program at
any time without notification.
General Motors North America and
GMC reserve the right to limit
services or payment to an owner or
driver if they decide the claims are
made too often, or the same type of
claim is made many times.
Services Provided
.
Emergency Fuel Delivery:
Delivery of enough fuel for the
vehicle to get to the nearest
service station. 

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-11349177) - 2018 - CRC - 10/17/17
496 Index General Information (cont'd)
Vehicle Care . . . . . . . . . . . . . . . . . . 342
Glove Box . . . . . . . . . . . . . . . . . . . . . . 124
GM Mobility Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . . 469
H Halogen Bulbs . . . . . . . . . . . . . . . . . . 378
Hazard Warning Flashers . . . . . . . 180
Head Restraints . . . . . . . . . . . . . . . . . 58
Headlamps
Aiming . . . . . . . . . . . . . . . . . . . . . . . . 377
Automatic . . . . . . . . . . . . . . . . . . . . . 179
Bulb Replacement . . . . . . . . . . . . 378
Daytime Running
Lamps (DRL) . . . . . . . . . . . . . . . . 179
Flash-to-Pass . . . . . . . . . . . . . . . . . 179
High Intensity Discharge
(HID) Lighting . . . . . . . . . . . . . . . 378
High-Beam On Light . . . . . . . . . . 157
High/Low Beam Changer . . . . . 179
Lamps On Reminder . . . . . . . . . 157
Heated
Steering Wheel . . . . . . . . . . . . . . . 130
Heated and Ventilated Front
Seats . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Heated Mirrors . . . . . . . . . . . . . . . . . . . 50 Heater
Engine Coolant . . . . . . . . . . . . . . . 260
Heating . . . . . . . . . . . . . . .224, 226, 228
High Voltage Devices and
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 380
High-Beam On Light . . . . . . . . . . . . 157
High-Speed Operation . . . . . . . . . . 399
Hill and Mountain Roads . . . . . . . . 245
Hill Descent Control (HDC) . . . . . 284
Hill Descent Control Light . . . . . . . 153
Hill Start Assist (HSA) . . . . . . . . . . 282
Home Page . . . . . . . . . . . . . . . . . . . . . 189
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
How to Wear Seat Belts
Properly . . . . . . . . . . . . . . . . . . . . . . . . 70
HVAC . . . . . . . . . . . . . . . . .224, 226, 228
I Idle System
Fast . . . . . . . . . . . . . . . . . . . . . . . . . . 259
Ignition Positions . . . . . . . . . . . . . . . 256
Ignition Transmission Lock
Check . . . . . . . . . . . . . . . . . . . . . . . . . 374
Immobilizer . . . . . . . . . . . . . . . . . . . . . . 46
Indicator
Vehicle Ahead . . . . . . . . . . . . . . . . 154 Infants and Young Children,
Restraints . . . . . . . . . . . . . . . . . . . . . . 94
Infotainment . . . . . . . . . . . . . . . . . . . . 186
Infotainment System . . . . . . . . . . . . 478
Instrument Cluster . . . . . . . . . . . . . . 138
Instrument Panel
Storage Area . . . . . . . . . . . . . . . . . 124
Interior Rearview Mirrors . . . . . . . . . 51
Introduction . . . . . . . . . . . . . . . . . . . . . . . 2
J Jack
Auxiliary . . . . . . . . . . . . . . . . . . . . . . 203
Jump Starting - North
America . . . . . . . . . . . . . . . . . . . . . . . 426
K Keyless Entry
Remote (RKE) System . . . . . . . . . 37
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
L Labeling, Tire Sidewall . . . . . . . . . . 391
Lamps
Auxiliary Roof
Mounted Lamp . . . . . . . . . . . . . . 182
Cargo . . . . . . . . . . . . . . . . . . . . . . . . . 183
Daytime Running (DRL) . . . . . . 179
Dome . . . . . . . . . . . . . . . . . . . . . . . . . 183 

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-11349177) - 2018 - CRC - 10/17/17
Index 497Lamps (cont'd)
Exterior Controls . . . . . . . . . . . . . . 176
Exterior Lamps Off
Reminder . . . . . . . . . . . . . . . . . . . 178
Exterior Lighting Battery
Saver . . . . . . . . . . . . . . . . . . . . . . . 185
Malfunction Indicator
(Check Engine) . . . . . . . . . . . . . 150
On Reminder . . . . . . . . . . . . . . . . . 157
Reading . . . . . . . . . . . . . . . . . . . . . . 183
Lane Departure
Warning (LDW) . . . . . . . . . . . . . . . . 295
Lane Departure Warning
Light . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Lane Keep Assist (LKA) . . . . . . . . 297
Lane Keep Assist Light . . . . . . . . . 154
Lap Belt . . . . . . . . . . . . . . . . . . . . . . . . . 75
Lap-Shoulder Belt . . . . . . . . . . . . . . . 71
LATCH System
Replacing Parts after a
Crash . . . . . . . . . . . . . . . . . . . . . . . . 111
LATCH, Lower Anchors and
Tethers for Children . . . . . . . . . . . . 99
LED Lighting . . . . . . . . . . . . . . . . . . . . 378
Lighting
Entry . . . . . . . . . . . . . . . . . . . . . . . . . 184
Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Illumination Control . . . . . . . . . . . 182 Lighting (cont'd)
LED . . . . . . . . . . . . . . . . . . . . . . . . . . 378
Lights
Airbag On-Off . . . . . . . . . . . . . . . . . 147
Airbag Readiness . . . . . . . . . . . . . 147
Antilock Brake System
(ABS) Warning . . . . . . . . . . . . . . 152
Brake System Warning . . . . . . . 152
Charging System . . . . . . . . . . . . . 149
Check Engine (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . 150
Cruise Control . . . . . . . . . . . . . . . . 158
Door Ajar . . . . . . . . . . . . . . . . . . . . . 158
Engine Coolant
Temperature Warning . . . . . . . 155
Engine Oil Pressure . . . . . . . . . . 156
Flash-to-Pass . . . . . . . . . . . . . . . . . 179
Four-Wheel-Drive . . . . . . . . . . . . . 153
Front Fog Lamp . . . . . . . . . . . . . . 157
High-Beam On . . . . . . . . . . . . . . . . 157
High/Low Beam Changer . . . . . 179
Hill Descent Control . . . . . . . . . . 153
Lane Departure Warning . . . . . . 153
Lane Keep Assist . . . . . . . . . . . . . 154
Low Fuel Warning . . . . . . . . . . . . 156
Seat Belt Reminders . . . . . . . . . . 146
Security . . . . . . . . . . . . . . . . . . . . . . 157
StabiliTrak OFF . . . . . . . . . . . . . . . 154 Lights (cont'd)
Tire Pressure . . . . . . . . . . . . . . . . . 156
Tow/Haul Mode . . . . . . . . . . . . . . . 153
Traction Control System
(TCS)/StabiliTrak . . . . . . . . . . . . 155
Traction Off . . . . . . . . . . . . . . . . . . . 154
Locking Rear Axle . . . . . . . . . . . . . . 285
Locks
Automatic Door . . . . . . . . . . . . . . . . . 41
Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Lockout Protection . . . . . . . . . . . . . . 42
Power Door . . . . . . . . . . . . . . . . . . . . . 41
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Loss of Control . . . . . . . . . . . . . . . . . 238
Low Fuel Warning Light . . . . . . . . . 156
Low-Profile Tires . . . . . . . . . . . . . . . . 390
Lower Anchors and Tethers
for Children (LATCH
System) . . . . . . . . . . . . . . . . . . . . . . . . 99
Lumbar Adjustment . . . . . . . . . . . . . . 60
Front Seats . . . . . . . . . . . . . . . . . . . . . 60
M Maintenance
Records . . . . . . . . . . . . . . . . . . . . . . 459
Maintenance and Care
Additional . . . . . . . . . . . . . . . . . . . . . 453
Maintenance Schedule . . . . . . . . . 448 

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-11349177) - 2018 - CRC - 10/17/17
502 Index Towing (cont'd)
Trailer . . . . . . . . . . . . . . . . . . . . . . . . 307
Trailer Sway Control (TSC) . . . 334
Vehicle . . . . . . . . . . . . . . . . . . . . . . . 430
Traction
Control System (TCS)/
StabiliTrak Light . . . . . . . . . . . . . 155
Off Light . . . . . . . . . . . . . . . . . . . . . . 154
Traction Control/Electronic
Stability Control . . . . . . . . . . . . . . . 282
Trademarks and License
Agreements . . . . . . . . . . . . . . . . . . . 218
Trailer
Sway Control (TSC) . . . . . . . . . . 334
Tow Mirrors . . . . . . . . . . . . . . . . . . . . . 48
Towing . . . . . . . . . . . . . . . . . . . . . . . . 307
Transfer Case . . . . . . . . . . . . . . . . . . 272
Transmission
Automatic . . . . . . . . . . . . . . . . . . . . . 265
Fluid, Automatic . . . . . . . . . 354, 357
Temperature Gauge . . . . . . . . . . 145
Transportation Program,
Courtesy . . . . . . . . . . . . . . . . . . . . . . 471
Trip Odometer . . . . . . . . . . . . . . . . . . 142
Truck-Camper Loading
Information . . . . . . . . . . . . . . . . . . . . 253
Turn and Lane-Change
Signals . . . . . . . . . . . . . . . . . . . . . . . . 181 Turn Signal
Bulb Replacement . . . . . . . . . . . . 378
U Uniform Tire Quality Grading . . . 410
Universal Remote System . . . . . . 172
Operation . . . . . . . . . . . . . . . . . . . . . 174
Programming . . . . . . . . . . . . . . . . . 172
Updates
Software . . . . . . . . . . . . . . . . . . . . . . 189
USB Port . . . . . . . . . . . . . . . . . . . . . . . 197
Using This Manual . . . . . . . . . . . . . . . . 2
V Vehicle
Alarm System . . . . . . . . . . . . . . . . . . 44
Canadian Owners . . . . . . . . . . . . . . . 2
Control . . . . . . . . . . . . . . . . . . . . . . . 236
Identification Number (VIN) . . . 460
Load Limits . . . . . . . . . . . . . . . . . . . 248
Messages . . . . . . . . . . . . . . . . . . . . 164
Personalization . . . . . . . . . . . . . . . 165
Remote Start . . . . . . . . . . . . . . . . . . . 39
Security . . . . . . . . . . . . . . . . . . . . . . . . 44
Speed Messages . . . . . . . . . . . . . 164
Towing . . . . . . . . . . . . . . . . . . . . . . . . 430
Vehicle Ahead Indicator . . . . . . . . 154 Vehicle Care
Tire Pressure . . . . . . . . . . . . . . . . . 397
Vehicle Data Recording and
Privacy . . . . . . . . . . . . . . . . . . . . . . . . 477
Ventilation, Air . . . . . . . . . . . . . . . . . . 231
Visors . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Voice Recognition . . . . . . . . . . . . . . 205
Voltage Devices and Wiring . . . . 380
Voltmeter Gauge . . . . . . . . . . . . . . . 145
W Warning
Brake System Light . . . . . . . . . . . 152
Caution and Danger . . . . . . . . . . . . . 3
Lane Departure (LDW) . . . . . . . 295
Warning Lights, Gauges, and
Indicators . . . . . . . . . . . . . . . . . . . . . 137
Warnings
Hazard Flashers . . . . . . . . . . . . . . 180
Washer Fluid . . . . . . . . . . . . . . . . . . . 366
Wheels
Alignment and Tire Balance . . .411
Different Size . . . . . . . . . . . . . . . . . 409
Replacement . . . . . . . . . . . . . . . . . 412
When It Is Time for New
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 407
Where to Put the Restraint . . . . . . 98
Wi-Fi . . . . . . . . . . . . . . . . . . . . . . . . . . . 482