GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-14632426) - 2021 - CRC - 11/5/20
Driving and Operating 283
When the System Does Not Seem to
Work Properly
The system performance may be
affected by:
.Close vehicles ahead.
.Sudden lighting changes, such as when
driving through tunnels.
.Banked roads.
.Roads with poor lane markings, such as
two-lane roads.
If the LKA system is not functioning
properly when lane markings are clearly
visible, cleaning the windshield may help.
A camera blocked message may display if
the camera is blocked. Some driver
assistance systems may have reduced
performance or not work at all. An LKA or
LDW unavailable message may display if the
systems are temporarily unavailable. This
message could be due to a blocked camera.
The LKA system does not need service. Clean
the outside of the windshield behind the
rearview mirror.
LKA assistance and/or LDW alerts may occur
due to tar marks, shadows, cracks in the
road, temporary or construction lane
markings, or other road imperfections. This is normal system operation; the vehicle does
not need service. Turn LKA off if these
conditions continue.
Fuel
Top Tier Fuel
GM recommends the use of TOP TIER
Detergent Gasoline to keep the engine clean,
reduce engine deposits, and maintain
optimal vehicle performance. Look for the
TOP TIER Logo or see www.toptiergas.com
for a list of TOP TIER Detergent Gasoline
marketers and applicable countries.
Recommended Fuel (Except 6.2L
V8 Engine)
For diesel engine vehicles, see
“Fuel for
Diesel Engines” in the Duramax diesel
supplement.
If the vehicle has a yellow fuel cap or a
yellow sticker on the fuel door, E85 or
FlexFuel can be used. If the vehicle does not
have a yellow fuel cap or yellow sticker, do
not use gasoline with ethanol levels greater
than 15% by volume. See E85 or FlexFuel
0 284.
Use regular unleaded gasoline meeting
ASTM specification D4814 with a posted
octane rating of 87 —(R+M)/2 —or higher.
Do not use gasoline with a posted octane
rating of less than 87, as this may cause
engine knock and will lower fuel economy.
GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
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Driving and Operating 289
Warning (Continued)
trailer only if all the steps in this section
have been followed. Ask your dealer for
advice and information about towing a
trailer with the vehicle.
Driving with a Trailer
Trailering is different than just driving the
vehicle by itself. Trailering means changes in
handling, acceleration, braking, durability,
and fuel economy. Successful, safe trailering
takes correct equipment, and it has to be
used properly.
The following information has many
time-tested, important trailering tips and
safety rules. Many of these are important
for your safety and that of your passengers.
Read this section carefully before pulling a
trailer.
When towing a trailer:
.Become familiar with and follow all state
and local laws that apply to trailer
towing. These requirements vary from
state to state.
.State laws may require the use of
extended side view mirrors. Even if not
required, you should install extended side
view mirrors if your visibility is limited or
restricted while towing.
.Do not tow a trailer during the first
800 km (500 mi) of vehicle use to prevent
damage to the engine, axle, or other
parts.
.It is recommended to perform the first oil
change before heavy towing.
.During the first 800 km (500 mi) of trailer
towing, do not drive over 80 km/h
(50 mph) and do not make starts at full
throttle.
.Vehicles can tow in D (Drive). Tow/Haul
Mode is recommended for heavier trailers.
SeeTow/Haul Mode 0242. If the
transmission downshifts too often, a
lower gear may be selected using Manual
Mode. See Manual Mode 0241.
If equipped, the following driver assistance
features should be turned off when towing
a trailer:
.Adaptive Cruise Control (ACC)
.Super Cruise Control
.Lane Keep Assist (LKA)
.Park Assist
.Automatic Parking Assist (APA)
.Reverse Automatic Braking (RAB)
If equipped, the following driver assistance
features should be turned to alert or off
when towing a trailer:
.Automatic Emergency Braking (AEB)
.Intelligent Brake Assist (IBA)
.Front Pedestrian Braking (FPB)
If equipped with Lane Change Alert (LCA),
the LCA detection zones that extend back
from the side of the vehicle do not move
further back when a trailer is towed. Use
caution while changing lanes when towing a
trailer.
If equipped with Rear Cross Traffic Alert
(RCTA), use caution while backing up when
towing a trailer, as the RCTA detection zones
that extend out from the back of the vehicle
do not move further back when a trailer is
towed.
GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./
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318 Driving and Operating
If Tow/Haul Mode is off and this setting is
on for a Trailer Profile, each time the
ignition is turned on a reminder will appear
to turn on Tow/Haul Mode when the Trailer
Profile is active.
If Tow/Haul Mode is on and this setting is
on for a Trailer Profile, the reminder will not
appear when the Trailer Profile is active.
Trailer Length Indicator
Touch Trailer Length Indicator to view the
Trailer Length Indicator settings page. If this
setting is ON a guideline is displayed in the
side mirror camera view to indicate the rear
of the attached trailer. If this setting is OFF
the guideline will not be displayed.
This setting will default to OFF if the trailer
length indicator feature is not set up. See
"Towing Assistance" for details on the setup.
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) 0115.
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 069 and
Adding Equipment to the Airbag-Equipped
Vehicle 069.
For information on wiring auxiliary switches,
see www.gmupfitter.com or contact your
dealer.
Adding a Snow Plow or Similar
Equipment
Caution
Do not exceed 72 km/h (45 mph) with a
snow plow mounted to the vehicle. The
vehicle could overheat and be damaged.
Before installing a snow plow on the vehicle,
follow these guidelines:
Caution
If the vehicle does not have the snow
plow prep package, RPO VYU, adding a
plow can damage the vehicle, and the
repairs would not be covered by the
vehicle warranty. Unless the vehicle was
built to carry a snow plow, do not add
(Continued)
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Index 449
Assistance Program, Roadside . . . . . . . . . . . . .431
Assistance Systems for Driving . . . . . . . . . . 274
Assistance Systems for Parking andBacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
Audio Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Auto Stop
Stop/Start System . . . . . . . . . . . . . . . . . . . . . 233
Automatic Dimming Mirrors . . . . . . . . . . . . . . . . . . . . . . . 37
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Emergency Braking (AEB) . . . . . . . . . . . . . . 277
Headlamp System . . . . . . . . . . . . . . . . . . . . . 142
Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Transmission Fluid . . . . . . . . . . . . . . . . . . . . . 333
Automatic Transmission
Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . 241
Shift Lock Control Function Check . . . . . . 347
Auxiliary Roof Mounted Lamp . . . . . . . . . . . . . . . . . . . 144
Auxiliary Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Avoiding Untrusted Media Devices . . . . . . . .158
Axle, Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
Axle, Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346B
Battery
Exterior Lighting Battery Saver . . . . . . . . 147
Load Management . . . . . . . . . . . . . . . . . . . . . 146
Power Protection . . . . . . . . . . . . . . . . . . . . . . 147
Battery - North America . . . . . . . . . . . . .343, 391
Blade Replacement, Wiper . . . . . . . . . . . . . . . 348
Blind Spot Mirrors . . . . . . . . . . . . . . . . . . . . . . . . .37
Bluetooth Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 180, 181
Bluetooth Audio . . . . . . . . . . . . . . . . . . . . . . . . . 162
Brake Electric Boost . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Parking, Electric . . . . . . . . . . . . . . . . . . . . . . . . 247
System Warning Light . . . . . . . . . . . . . . . . . . 117
Brake Pad Life System . . . . . . . . . . . . . . . . . . . 342
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .341 Antilock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248
Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
Pad Life System . . . . . . . . . . . . . . . . . . . . . . . 342
Braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213 Automatic Emergency (AEB) . . . . . . . . . . . 277
Braking System
Front Pedestrian (FPB) . . . . . . . . . . . . . . . . . 278
Break-In, New Vehicle . . . . . . . . . . . . . . . . . . . . 228 Bulb Replacement
Center High-Mounted Stoplamp
(CHMSL) and Cargo Lamp . . . . . . . . . . . . 352
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . 350
Headlamp Aiming . . . . . . . . . . . . . . . . . . . . . . 350
Headlamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Headlamps, Front Turn Signal, Sidemarker, and Parking Lamps . . . . . . 350
License Plate Lamps . . . . . . . . . . . . . . . . . . . 352
Taillamps, Turn Signal, Stoplamps, and Back-up Lamps . . . . . . . . . . . . . . . . . . 351
Buying New Tires . . . . . . . . . . . . . . . . . . . . . . . . 376
C
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
California Perchlorate Materials Requirements . . . 322
California Proposition 65 Warning . . . . . . . . . . . . . . . . . . .322, 343, 391, Back Cover
Canadian Vehicle Owners . . . . . . . . . . . . . . . . . . .2
Capacities and Specifications . . . . . . . . . . . . . 424
Carbon Monoxide
Engine Exhaust . . . . . . . . . . . . . . . . . . . . . . . . 238
Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Winter Driving . . . . . . . . . . . . . . . . . . . . . . . . . 220
Cargo Tie-Downs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
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Index 453
H
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Hazard Warning Flashers . . . . . . . . . . . . . . . . .142
HD Radio Technology . . . . . . . . . . . . . . . . . . . . 156
Head Restraints . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Head-up Display . . . . . . . . . . . . . . . . . . . . . . . . . .128
HeadlampsAiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . 350
Daytime Running Lamps (DRL) . . . . . . . . . . 141
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Headlamps, Front Turn Signal,Sidemarker, and Parking Lamps . . . . . . 350
High-Beam On Light . . . . . . . . . . . . . . . . . . . 123
High/Low Beam Changer . . . . . . . . . . . . . . . 141
Lamps On Reminder . . . . . . . . . . . . . . . . . . . 123
Heated Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Steering Wheel . . . . . . . . . . . . . . . . . . . . . . . . 100
Heated and Ventilated Front Seats . . . . . . . .52
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Heater Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204, 206
High-Beam On Light . . . . . . . . . . . . . . . . . . . . . . 123
Hill and Mountain Roads . . . . . . . . . . . . . . . . 219
Hill Descent Control (HDC) . . . . . . . . . . . . . . . 250 Hill Descent Control Light . . . . . . . . . . . . . . . . . 119
Hill Start Assist (HSA) . . . . . . . . . . . . . . . . . . . . 248
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
How to Wear Seat Belts Properly . . . . . . . . . .55
HVAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204, 206
I
If the System Needs Service . . . . . . . . . . . . . . 175
Ignition Positions . . . . . . . . . . . . . . . . . . . 229, 230
Ignition Transmission Lock Check . . . . . . . . 347
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Indicator
Pedestrian Ahead . . . . . . . . . . . . . . . . . . . . . . . 119
Vehicle Ahead . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Infants and Young Children, Restraints . . . . .72
Information Publication Ordering . . . . . . . . . . . . . . . . . . . 435
Infotainment System . . . . . . . . . . . . . . . . . . . . 439
Instrument Cluster . . . . . . . . . . . . . . . . . . . . . . . 106
Instrument Panel Overview . . . . . . . . . . . . . . . . 4
Interior Rearview Mirrors . . . . . . . . . . . . . . . . . 38
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 1, 148
J
Jack Auxiliary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Jump Starting - North America . . . . . . . . . . . 391
K
Keyless Entry Remote (RKE) System . . . . . . . . . . . . . . . . 10, 13
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7, 9
L
Labeling, Tire Sidewall . . . . . . . . . . . . . . . . . . . 362
Lamps Auxiliary Roof Mounted Lamp . . . . . . . . . 144
Daytime Running (DRL) . . . . . . . . . . . . . . . . . 141
Dome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Exterior Cargo . . . . . . . . . . . . . . . . . . . . . . . . . 144
Exterior Controls . . . . . . . . . . . . . . . . . . . . . . . 139
Exterior Lamps Off Reminder . . . . . . . . . . . 141
Exterior Lighting Battery Saver . . . . . . . . 147
License Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . 352
Malfunction Indicator (CheckEngine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
On Reminder . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Lane Change Alert (LCA) . . . . . . . . . . . . . . . . . 280
Lane Keep Assist (LKA) . . . . . . . . . . . . . . . . . . . .281
Lane Keep Assist Light . . . . . . . . . . . . . . . . . . . . 119
Lap-Shoulder Belt . . . . . . . . . . . . . . . . . . . . . . . . . .57
LATCH System Replacing Parts after a Crash . . . . . . . . . . . 88
LATCH, Lower Anchors and Tethers for Children . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
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454 Index
LED Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
LightingEntry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Illumination Control . . . . . . . . . . . . . . . . . . . 145
LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Lights Airbag Readiness . . . . . . . . . . . . . . . . . . . . . . . 114
Antilock Brake System (ABS)Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Brake System Warning . . . . . . . . . . . . . . . . . 117
Charging System . . . . . . . . . . . . . . . . . . . . . . . 115
Check Engine (Malfunction Indicator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Cruise Control . . . . . . . . . . . . . . . . . . . . . . . . . 123
Door Ajar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Driver Mode Control . . . . . . . . . . . . . . . . . . . . 121
Electric Parking Brake . . . . . . . . . . . . . . . . . . . 117
Electronic Stability Control (ESC), Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Engine Coolant Temperature Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Engine Oil Pressure . . . . . . . . . . . . . . . . . . . . 122
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Four-Wheel-Drive . . . . . . . . . . . . . . . . . . . . . . . 118
Front Fog Lamp . . . . . . . . . . . . . . . . . . . . . . . . 123
High-Beam On . . . . . . . . . . . . . . . . . . . . . . . . . 123 Lights (cont'd)
High/Low Beam Changer . . . . . . . . . . . . . . . 141
Hill Descent Control . . . . . . . . . . . . . . . . . . . . 119
Lane Keep Assist . . . . . . . . . . . . . . . . . . . . . . . . 119
Low Fuel Warning . . . . . . . . . . . . . . . . . . . . . 122
Seat Belt Reminders . . . . . . . . . . . . . . . . . . . . 113
Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Service Electric Parking Brake . . . . . . . . . . . 118
Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Tow/Haul Mode . . . . . . . . . . . . . . . . . . . . . . . . 119
Traction Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Limited-Slip Differential . . . . . . . . . . . . . . . . . . 254
Lock
Steering Column . . . . . . . . . . . . . . . . . . . . . . . . 32
Locking Rear Axle . . . . . . . . . . . . . . . . . . . . . . . . 254
Locks Automatic Door . . . . . . . . . . . . . . . . . . . . . . . . . 22
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . 22
Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Lockout Protection . . . . . . . . . . . . . . . . . . . . . . 22
Power Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Loss of Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Low Fuel Warning Light . . . . . . . . . . . . . . . . . . 122
Lower Anchors and Tethers for Children (LATCH System) . . . . . . . . . . . . . . . . .77
Lumbar Adjustment . . . . . . . . . . . . . . . . . . . . . . . 48 Front Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48M
MaintenanceRecords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422
Maintenance and Care Additional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
Maintenance Schedule . . . . . . . . . . . . . . . . . . . 409 Recommended Fluids andLubricants . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
Transfer Case . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Malfunction Indicator Lamp . . . . . . . . . . . . . . . 115
Manual Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . .241
Manual Windows . . . . . . . . . . . . . . . . . . . . . . . . . .41
Map Data Updates . . . . . . . . . . . . . . . . . . . . . . . . 175
Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Media
Avoiding Untrusted Devices . . . . . . . . . . . . 158
Memory Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Messages Engine Power . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Vehicle Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Mirror Rear Camera . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Mirrors Automatic Dimming . . . . . . . . . . . . . . . . . . . . 37
Automatic Dimming Rearview . . . . . . . . . . 38
Blind Spot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
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Index 455
Mirrors (cont'd)Convex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Folding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Manual Rearview . . . . . . . . . . . . . . . . . . . . . . . 38
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Tilt in Reverse . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Trailer Tow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Mirrors, Interior Rearview . . . . . . . . . . . . . . . . . 38
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 Driver Control . . . . . . . . . . . . . . . . . . . . . . . . . 251
Monitor System, Tire Pressure . . . . . . . . . . . 368
Multi-band Antenna . . . . . . . . . . . . . . . . . . . . . .158
N
Navigation Connected Services . . . . . . . . . . . . . . . . . . . . 445
Destination . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Using the System . . . . . . . . . . . . . . . . . . . . . . 163
Navigation Symbols . . . . . . . . . . . . . . . . . . . . . 166
New Vehicle Break-In . . . . . . . . . . . . . . . . . . . . 228
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214 Oil
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
Engine Oil Life System . . . . . . . . . . . . . . . . . 332
Engine Oil Pressure Gauge . . . . . . . . . . . . . . 111
Pressure Light . . . . . . . . . . . . . . . . . . . . . . . . . 122
Older Children, Restraints . . . . . . . . . . . . . . . . . . 71
Online Owner Center . . . . . . . . . . . . . . . . . . . . 430
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439
OnStar Additional Information . . . . . . . . . . . 441
OnStar Emergency . . . . . . . . . . . . . . . . . . . . . . . 441
OnStar Overview . . . . . . . . . . . . . . . . . . . . . . . . . 440
OnStar Security . . . . . . . . . . . . . . . . . . . . . . . . . . 441
OnStar System . . . . . . . . . . . . . . . . . . . . . . 162, 173
Operating Mode Overheated Engine Protection . . . . . . . . . 340
Operation
Fog Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Overheated Engine Protection Operating Mode . . . . . . . . . . . . . . . . . . . . . . . 340
Overheating, Engine . . . . . . . . . . . . . . . . . . . . . 338
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149 Instrument Panel . . . . . . . . . . . . . . . . . . . . . . . . 4
P
ParkShifting Into . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
Shifting Out of . . . . . . . . . . . . . . . . . . . . . . . . 237
Park Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
Parking
Brake and P (Park) MechanismCheck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
Over Things That Burn . . . . . . . . . . . . . . . . . 237
Parking or Backing Assistance Systems . . . . . . . . . . . . . . . . . . . . 266
Passenger Airbag Status Indicator . . . . . . . . . 114
Passenger Compartment Air Filter . . . . . . . 209
Passenger Sensing System . . . . . . . . . . . . . . . . 66
Pedestrian Ahead Indicator . . . . . . . . . . . . . . . 119
Perchlorate Materials Requirements, California . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
Personalization
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Phone Apple CarPlay and Android Auto . . . . . . . 185
Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . 180, 181
Pickup Conversion to Chassis Cab . . . . . . . . 320
Port
USB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Positioning Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
GMC Sierra/Sierra Denali 1500 Owner Manual (GMNA-Localizing-U.S./Cana-
da/Mexico-14632426) - 2021 - CRC - 11/5/20
456 Index
PowerDoor Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Protection, Battery . . . . . . . . . . . . . . . . . . . . . 147
Retained Accessory (RAP) . . . . . . . . . . . . . . 236
Seat Adjustment . . . . . . . . . . . . . . . . . . . . . . . . 47
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Power Assist Steps . . . . . . . . . . . . . . . . . . . . . . . . 30
Pregnancy, Using Seat Belts . . . . . . . . . . . . . . 59
Privacy Vehicle Data Recording . . . . . . . . . . . . . . . . 437
Problems with Route Guidance . . . . . . . . . . .174
Program Courtesy Transportation . . . . . . . . . . . . . . . 433
Prohibited Fuels . . . . . . . . . . . . . . . . . . . . . . . . . 284
Proposition 65 Warning,
California . . . . . . . . . . . . . . . . . . . . .322, 343, 391, Back Cover
Publication Ordering Information . . . . . . . . 435
R
Radio HD Radio Technology . . . . . . . . . . . . . . . . . . 156
Radio Data System (RDS) . . . . . . . . . . . . . . . . . 157
Radio Frequency Statement . . . . . . . . . . . . . . 436
Radio Reception . . . . . . . . . . . . . . . . . . . . . . . . . .158 Radios
AM-FM Radio . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Satellite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Reading Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Rear Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346 Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
Rear Camera Mirror . . . . . . . . . . . . . . . . . . . . . . . 38
Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Rear Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Rear Vision Camera (RVC) . . . . . . . . . . . . . . . . 266
Rear Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Rearview Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . 38 Automatic Dimming . . . . . . . . . . . . . . . . . . . . 38
Reclining Seatbacks . . . . . . . . . . . . . . . . . . . . . . . 48
Recognition Voice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Recommended Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283, 284
Recommended Fluids and Lubricants . . . . . 418
Records Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 422
Recreational Vehicle Towing . . . . . . . . . . . . . 395
Reimbursement Program, GM Mobility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .431
Remote Keyless Entry (RKE) System . . . 10, 13
Remote Vehicle Start . . . . . . . . . . . . . . . . . . . . . 20 Replacement
Glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348
Replacement Parts Airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 419
Replacing Airbag System . . . . . . . . . . . . . . . . . . . 71
Replacing LATCH System Parts after a Crash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Replacing Seat Belt System Parts after a Crash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Reporting Safety Defects
Canadian Government . . . . . . . . . . . . . . . . . 437
General Motors . . . . . . . . . . . . . . . . . . . . . . . . 437
U.S. Government . . . . . . . . . . . . . . . . . . . . . . . 436
Restraints Where to Put . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Retained Accessory Power (RAP) . . . . . . . . . 236
Reverse Tilt Mirrors . . . . . . . . . . . . . . . . . . . . . . . 38
Ride Control Systems Enhanced Traction System (ETS) . . . . . . . 254
Roads
Driving, Wet . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Roadside Assistance Program . . . . . . . . . . . . .431
Roof Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Rotation, Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
Routing, Engine Drive Belt . . . . . . . . . . . . . . . 427
Running the Vehicle While Parked . . . . . . . 238