brake light GMC SIERRA 2023 Service Manual

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/18/22
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 the automatic
transmission in P (Park) 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.
{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
vehicle has one. Negative (–) will go to a
heavy, unpainted metal engine part or to
a remote negative (–) terminal if the
vehicle has one.
Do not connect positive (+) to negative
(–) or you will get a short that would
damage the battery and maybe other
parts too. And do not connect the
negative (–) cable to the negative (–)
terminal on the dead battery because
this can cause sparks.
7. Connect one end of the red positive (+) cable to the discharged battery
positive (+) terminal.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/18/22
Vehicle Care 373
5. With the engine running, release theparking brake and verify that the
transfer case is in N (Neutral) by shifting
the transmission to D (Drive) and then to
R (Reverse). There should be no
movement while shifting the
transmission.
6. Shift the transmission to D (Drive).
7. If equipped with an ignition key, turn the ignition to ACC/ACCESSORY.
If equipped with Keyless Access, turn the
engine off. Disregard the Shift to P (Park)
DIC message. See Ignition Positions (Key
Access) 0221 or
Ignition Positions (Keyless Access) 0223.
{Warning
To avoid death, serious injury,
or property damage, before dinghy
towing the vehicle, always disconnect and
secure the negative battery cable and
cover the negative battery post and cable
with a non-conductive material. If the
battery is left connected or the battery
cable contacts the post, the Electric
Parking Brake may activate during
towing, which could cause a crash. 8. Disconnect the negative (–) battery
cable. See “Negative Battery Cable
Disconnection” inBattery - North
America 0319.
9. Shift the transmission to P (Park).
Caution
If the steering column is locked, vehicle
damage may occur.
10. Move the steering wheel to make sure the steering column is unlocked.
11. If the vehicle has an ignition key, keep it in the towed vehicle in ACC/ACCESSORY
to prevent the steering column from
locking. If the vehicle is equipped with
Keyless Access, keep the RKE transmitter
outside of the vehicle and manually lock
the doors. Access the vehicle by using
the key in the door lock. See Door Locks
0 23.
Disconnecting the Towed Vehicle
Before disconnecting from the tow vehicle: 1. Park on a level surface. Secure the vehicle with wheel blocks.
2. Re-connect the negative (–) battery. See Battery - North America 0319. 3. Turn on the ignition with the engine off.
For vehicles with a key, turn the ignition
to ON/RUN with the engine off. If the
vehicle is equipped with Keyless Access,
with your foot off the brake pedal, press
and hold ENGINE START/STOP for
five seconds until the green light comes
on in the button. See Ignition Positions
(Key Access) 0221 or
Ignition Positions (Keyless Access) 0223.
4. Set the parking brake. See Electric
Parking Brake 0239.
5. Disconnect from the tow vehicle.
6. Shift the transmission to N (Neutral).
7. Shift the transfer case to 2
m(Two-Wheel
Drive High). When the shift to 2
m
(Two-Wheel Drive High) is complete, the
light in the instrument cluster will stop
flashing and stay lit. See
Four-Wheel-Drive Light 0123.
8. Start the engine. Check that the vehicle is in 2
m(Two-Wheel Drive High) by
starting the engine and shifting the
transmission to D (Drive) and then to
R (Reverse). There should be movement
of the vehicle while shifting.
9. Shift the transmission to P (Park) and turn off the ignition.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/18/22
374 Vehicle Care
10. Release the parking brake and removethe wheel blocks.
11. Reset any lost presets. The outside temperature display will
default to 0 °C (32 °F) but will reset with
normal usage.
Dolly Towing
Caution
Do not tow this vehicle with two wheels
on the ground, or vehicle damage could
occur. This damage would not be covered
by the vehicle warranty.
Dolly towing this vehicle is not allowed with
either the front or the rear tires on the
ground for two-wheel drive or four-wheel
drive, regardless of transfer case.
Appearance Care
Exterior Care
Locks
Locks are lubricated at the factory. Use a
de-icing agent only when absolutely
necessary, and have the locks greased after
using. See Recommended Fluids and
Lubricants 0389.
Washing the Vehicle
To preserve the vehicle's finish, wash it
often and out of direct sunlight.
{Warning
Do not power wash any part of the
vehicle’s interior, including the vinyl floor
covering. This could damage safety and
other systems in the vehicle, which
would not be covered by the vehicle
warranty.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Service and Maintenance 387
* Footnote: Under extreme driving
conditions listed above, it may be
necessary to replace your spark plugs at
more frequent intervals. For further
assistance in determining the most
suitable service maintenance intervals for
your vehicle, please contact your
authorized GM Dealer.
Extreme service is for vehicles mainly
driven off-road in four-wheel drive or used
in farming, mining, forestry, or snow
plowing.
Additional Required Services—Severe
Service
Every 40 000 km (25,000 mi)
.Change transfer case fluid, if equipped
with 4WD. 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. Every 72 000 km (45,000 mi)
.Change automatic transmission fluid and
filter.
Owner Checks and Services
Every Five Years
.Replace brake fluid.
Every Seven Years
.Replace Air Conditioning Desiccant every
seven years. The air conditioning system
requires maintenance every seven years.
This service requires replacement of the
desiccant to help the longevity and
efficient operation of the air conditioning
system. This service can be complex. See
your dealer.
Multi-Point Vehicle
Inspection (MPVI)
A Multi Point Vehicle Inspection (MPVI)
completed by a GM dealer technician is a
maintenance assessment of your vehicle.
The benefit of the MPVI is to identify and
inform the customer of service items that
require immediate attention and those that
may require attention in the future. The technician will perform the following
checks on your vehicle. For a complete list
of checks, inspections, and services, see your
dealer.
Some items may not apply to your vehicle
and/or region.
Diagnostics
.OnStar active, if equipped
.Service history/recall check
Engine Oil and Filter
.Engine oil
.Oil life monitor
‐
Reset oil life monitor
Exterior Lights
.Visual inspection
Windshield and Wipers
.Visual inspection
Battery
.Battery visual inspection
.Battery test results
.Battery cables and connections

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
416 Index
IndexA
Accessories and Modifications . . . . . . . . . . . 302
Accessory Power . . . . . . . . . . . . . . . . . . . . . . . . . 227
Add-On Electrical Equipment . . . . . . . . . . . . . 297
Adding a Snow Plow or SimilarEquipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
Additional OnStar Information . . . . . . . . . . . . . . . . . . . . 410
Adjustments Lumbar, Front Seats . . . . . . . . . . . . . . . . . . . . 53
Agreements Trademarks and License . . . . . . . . . . . . . . . 189
Air Cleaner/Filter, Engine . . . . . . . . . . . . . . . . . . 310
Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Filter Life System . . . . . . . . . . . . . . . . . . . . . . 309
Filter, Passenger Compartment . . . . . . . . 201
Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Air Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . 196
Airbag System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
How Does an Airbag Restrain? . . . . . . . . . . 69
Passenger Sensing System . . . . . . . . . . . . . . 70
What Makes an Airbag Inflate? . . . . . . . . . 68
What Will You See after an AirbagInflates? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
When Should an Airbag Inflate? . . . . . . . . 68
Where Are the Airbags? . . . . . . . . . . . . . . . . 67 Airbags
Adding Equipment to the Vehicle . . . . . . . 74
Passenger Status Indicator . . . . . . . . . . . . . . 119
Readiness Light . . . . . . . . . . . . . . . . . . . . . . . . . 119
Replacing System Parts after a
Crash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Servicing Airbag-Equipped Vehicles . . . . . . 73
Alarm Vehicle Security . . . . . . . . . . . . . . . . . . . . . . . . 34
Alert Lane Change . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Rear Cross Traffic . . . . . . . . . . . . . . . . . . . . . . 257
Side Blind Zone (SBZA) . . . . . . . . . . . . . . . . . 260
All-Season Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 338
All-Terrain Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 338
AM-FM Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . .154
Antenna Fixed Mast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Multi-band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Antilock Brake System (ABS) . . . . . . . . . . . . . 238 Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . 123
Appearance Care Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
Apple CarPlay and Android Auto . . . . . . . . . . 181
Assistance Program, Roadside . . . . . . . . . . . . 399
Assistance Systems
Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Index 417
Assistance Systems (cont'd)Parking and Backing . . . . . . . . . . . . . . . . . . . 248
Audio Bluetooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Automatic Dimming Mirrors . . . . . . . . . . . . . . . . . . . . . . . 39
Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Emergency Braking (AEB) . . . . . . . . . . . . . . 259
Headlamp System . . . . . . . . . . . . . . . . . . . . . . 141
Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Transmission Fluid . . . . . . . . . . . . . . . . . . . . . 309
Transmission Shift Lock ControlFunction Check . . . . . . . . . . . . . . . . . . . . . . . 322
Automatic Transmission Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . 232
Auxiliary
Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Roof Mounted Lamp . . . . . . . . . . . . . . . . . . . 144
Avoiding Untrusted Media Devices . . . . . . . .158
Axle Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
B
BatteryExterior Lighting Battery Saver . . . . . . . . 147
Load Management . . . . . . . . . . . . . . . . . . . . . 147 Battery (cont'd)
Power Protection . . . . . . . . . . . . . . . . . . . . . . 147
Battery - North America . . . . . . . . . . . . .319, 367
Blade Replacement, Wiper . . . . . . . . . . . . . . . 323
Blind Spot Mirrors . . . . . . . . . . . . . . . . . . . . . . . . 39
Bluetooth Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 176, 177
Brake Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318
Pad Life System . . . . . . . . . . . . . . . . . . . . . . . . 317
System Warning Light . . . . . . . . . . . . . . . . . 122
Brake Pad Life System . . . . . . . . . . . . . . . . . . . . 317
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317 Antilock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238
Brake Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
Electric Parking Brake . . . . . . . . . . . . . . . . . . 239
Braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 Automatic Emergency (AEB) . . . . . . . . . . . 259
Break-In, New Vehicle . . . . . . . . . . . . . . . . . . . . . 221
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . . . 325 Center High-Mounted Stoplamp(CHMSL) and Cargo Lamp . . . . . . . . . . . . 327
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . 325
Headlamp Aiming . . . . . . . . . . . . . . . . . . . . . . 325
Headlamps, Front Turn Signal, Sidemarker, and Parking Lamps . . . . . . 325
License Plate Lamps . . . . . . . . . . . . . . . . . . . 327 Bulb Replacement (cont'd)
Taillamps, Turn Signal, Stoplamps,
and Back-up Lamps . . . . . . . . . . . . . . . . . . 326
Buying New Tires . . . . . . . . . . . . . . . . . . . . . . . . 352
C
Calibration Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
California Perchlorate MaterialsRequirements . . . . . . . . . . . . . . . . . . . . . . . . 302
California Proposition 65 Warning . . . . . 1, 367
Camera
Rear Vision (RVC) . . . . . . . . . . . . . . . . . . . . . . 248
Truck Bed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Canadian Vehicle Owners . . . . . . . . . . . . . . . . . . .2
Capacities and Specifications . . . . . . . . . . . . . 393
Carbon Monoxide Engine Exhaust . . . . . . . . . . . . . . . . . . . . . . . . 229
Tailgate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Winter Driving . . . . . . . . . . . . . . . . . . . . . . . . . 212
Cargo
Tie-Downs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Caution, Danger, and Warning . . . . . . . . . . . . . .2
Center High-Mounted Stoplamp (CHMSL)
and Cargo Lamp . . . . . . . . . . . . . . . . . . . . . 327
Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Index 419
DoorAjar Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . 24
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Drive Belt Routing, Engine . . . . . . . . . . . . . . . 395
Drive Systems Four-Wheel Drive . . . . . . . . . . . . . . . . . . . . . . 321
Driver Assistance Systems . . . . . . . . . . . . . . . . . . . . 246
Information Center (DIC) . . . . . . . . . . . 128, 130
Mode Control . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Mode Control Light . . . . . . . . . . . . . . . . . . . . 125
Teen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Driving Assistance Systems . . . . . . . . . . . . . . . . . . . . 257
Better Fuel Economy . . . . . . . . . . . . . . . . . . . 204
Characteristics and Towing Tips . . . . . . . . 268
Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Distracted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Hill and Mountain Roads . . . . . . . . . . . . . . 212
If the Vehicle is Stuck . . . . . . . . . . . . . . . . . 214
Impaired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Loss of Control . . . . . . . . . . . . . . . . . . . . . . . . 207
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Off-Road Recovery . . . . . . . . . . . . . . . . . . . . . 207
Vehicle Load Limits . . . . . . . . . . . . . . . . . . . . 215
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211 Driving (cont'd)
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
Dual Automatic Climate Control System . . . . 197
E
E85 or FlexFuel . . . . . . . . . . . . . . . . . . . . . . . . . . 264
ElectricParking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Parking Brake Light . . . . . . . . . . . . . . . . . . . . 122
Electrical Equipment, Add-On . . . . . . . . . . . . . . . . . . . . 297
System Overload . . . . . . . . . . . . . . . . . . . . . . 327
Electrical System Engine Compartment Fuse Block . . . . . . . 329
Fuses and Circuit Breakers . . . . . . . . . . . . . 329
Instrument Panel Fuse Block . . . . . . 333, 334
Electronic Stability Control (ESC) Off Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409
Engine
Air Cleaner/Filter . . . . . . . . . . . . . . . . . . . . . . 310
Air Filter Life System . . . . . . . . . . . . . . . . . . 309
Check Light (Malfunction Indicator) . . . . 120
Compartment Overview . . . . . . . . . . . . . . . . 305
Coolant Temperature Gauge . . . . . . . . . . . . 117
Coolant Temperature Warning Light . . . 125 Engine (cont'd)
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . 311
Drive Belt Routing . . . . . . . . . . . . . . . . . . . . . 395
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Oil Life System . . . . . . . . . . . . . . . . . . . . . . . . 308
Oil Pressure Gauge . . . . . . . . . . . . . . . . . . . . . 116
Oil Pressure Light . . . . . . . . . . . . . . . . . . . . . . 126
Overheated Protection
Operating Mode . . . . . . . . . . . . . . . . . . . . . 315
Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
Power Messages . . . . . . . . . . . . . . . . . . . . . . . 135
Running While Parked . . . . . . . . . . . . . . . . . 230
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Equipment, Towing . . . . . . . . . . . . . . . . . . . . . . 276
Event Data Recorders . . . . . . . . . . . . . . . . . . . . 406
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Extended Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . .37
Extended Parking . . . . . . . . . . . . . . . . . . . . . . . . 229
Extender, Seat Belt . . . . . . . . . . . . . . . . . . . . . . . 64
Exterior
Cargo Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Lamp Controls . . . . . . . . . . . . . . . . . . . . . . . . . 139
Lamps Off Reminder . . . . . . . . . . . . . . . . . . . . 141
Lighting Battery Saver . . . . . . . . . . . . . . . . . 147

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
420 Index
F
FanEngine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
Filter Engine Air Cleaner . . . . . . . . . . . . . . . . . . . . . 310
Fixed Mast Antenna . . . . . . . . . . . . . . . . . . . . . .158
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Flashers, Hazard Warning . . . . . . . . . . . . . . . . .142
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356 Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357
Floor Console Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382
Fluid Automatic Transmission . . . . . . . . . . . . . . . 309
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318
Power Steering . . . . . . . . . . . . . . . . . . . . . . . . 315
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316
Fog Lamp Light
Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Fog Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Forward Collision Alert (FCA) System . . . . . . . . . . . 257 Four-Wheel Drive . . . . . . . . . . . . . . . . . . . . 234, 321
Four-Wheel-Drive
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404
Front Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
Heated and Ventilated Seats . . . . . . . . . . . . 56
Front Seats Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Fuel
Additives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
E85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
Economy, Driving for Better . . . . . . . . . . . 204
Filling a Portable Fuel Container . . . . . . . 268
Filling the Tank . . . . . . . . . . . . . . . . . . . 265, 266
Foreign Countries . . . . . . . . . . . . . . . . . . . . . . 264
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Low Fuel Warning Light . . . . . . . . . . . . . . . . 127
Prohibited Fuels . . . . . . . . . . . . . . . . . . . . . . . 264
Recommended . . . . . . . . . . . . . . . . . . . . . . . . . 263
Top Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Full-Size Spare Tire . . . . . . . . . . . . . . . . . . . . . . . 367
Fuses Engine Compartment Fuse Block . . . . . . . 329
Fuses and Circuit Breakers . . . . . . . . . . . . . 329
Instrument Panel Fuse Block . . . . . . 333, 334
G
Garage Door Opener . . . . . . . . . . . . . . . . . . . . . . 135
Programming . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324
Gauges Engine Coolant Temperature . . . . . . . . . . . . 117
Engine Oil Pressure . . . . . . . . . . . . . . . . . . . . . 116
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Speedometer . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Trip Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Warning Lights and Indicators . . . . . . . . . . 111
General Information Service and Maintenance . . . . . . . . . . . . . . 384
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
Glass Replacement . . . . . . . . . . . . . . . . . . . . . . . 323
Global Positioning System (GPS) . . . . . . . . . 170
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
GM Mobility Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399
Guidance
Problems with the Route . . . . . . . . . . . . . . 170

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
422 Index
Lamps (cont'd)Malfunction Indicator (Check
Engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
On Reminder . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Lane Change Alert (LCA) . . . . . . . . . . . . . . . . . . . . . 261
Departure Warning (LDW) . . . . . . . . . . . . . 262
Departure Warning Light . . . . . . . . . . . . . . 124
Lap-Shoulder Belt . . . . . . . . . . . . . . . . . . . . . . . . . .61
LATCH System Replacing Parts after a Crash . . . . . . . . . . . 92
LATCH, Lower Anchors and Tethers for Children . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
LED Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
Lighting Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Exit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Illumination Control . . . . . . . . . . . . . . . . . . . 145
LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Lights Airbag Readiness . . . . . . . . . . . . . . . . . . . . . . . 119
Antilock Brake System (ABS)Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Brake System Warning . . . . . . . . . . . . . . . . 122
Charging System . . . . . . . . . . . . . . . . . . . . . . 120 Lights (cont'd)
Check Engine (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Cruise Control Light . . . . . . . . . . . . . . . . . . . . 128
Door Ajar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Driver Mode Control . . . . . . . . . . . . . . . . . . . 125
Electric Parking Brake . . . . . . . . . . . . . . . . . . 122
Electronic Stability Control (ESC), Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Engine Coolant Temperature Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Engine Oil Pressure . . . . . . . . . . . . . . . . . . . . 126
Four-Wheel-Drive . . . . . . . . . . . . . . . . . . . . . . 123
Front Fog Lamp . . . . . . . . . . . . . . . . . . . . . . . . 128
Gauges and Indicators . . . . . . . . . . . . . . . . . . 111
High-Beam On . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Hill Descent Control . . . . . . . . . . . . . . . . . . . 123
Lane Departure Warning . . . . . . . . . . . . . . . 124
Low Fuel Warning . . . . . . . . . . . . . . . . . . . . . . 127
Seat Belt Reminders . . . . . . . . . . . . . . . . . . . . 118
Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Service Electric Parking Brake . . . . . . . . . . 122
Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Traction Control System
(TCS)/Electronic Stability Control
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Traction Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 Lock
Steering Column . . . . . . . . . . . . . . . . . . . . . . . . 35
Locking Rear Axle . . . . . . . . . . . . . . . . . . . . . . . . 244
Locks Automatic Door . . . . . . . . . . . . . . . . . . . . . . . . . 24
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . 24
Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Lockout Protection . . . . . . . . . . . . . . . . . . . . . . 25
Power Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Loss of Control . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Low Fuel Warning Light . . . . . . . . . . . . . . . . . . 127
Lower Anchors and Tethers for
Children (LATCH System) . . . . . . . . . . . . . . . . 82
Lumbar Adjustment . . . . . . . . . . . . . . . . . . . . . . . .53 Front Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
M
Maintenance
Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391
Maintenance Schedule . . . . . . . . . . . . . . . . . . . 385
Recommended Fluids andLubricants . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389
Malfunction Indicator Lamp . . . . . . . . . . . . . . 120
Manual Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
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Index 423
Map Data Updates . . . . . . . . . . . . . . . . . . . . . . . . 171
Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
MediaAvoiding Untrusted Devices . . . . . . . . . . . . 158
Memory Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Messages Engine Power . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Vehicle Speed . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Mirrors Automatic Dimming . . . . . . . . . . . . . . . . . . . . 39
Automatic Dimming Rearview . . . . . . . . . . 41
Blind Spot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Convex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Folding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Interior Rearview . . . . . . . . . . . . . . . . . . . . . . . 40
Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Manual Rearview . . . . . . . . . . . . . . . . . . . . . . . 41
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Rear Camera . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Tilt in Reverse . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Trailer Tow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Mode Driver Control . . . . . . . . . . . . . . . . . . . . . . . . . 243
Monitor System, Tire Pressure . . . . . . . . . . . 343
Multi-band Antenna . . . . . . . . . . . . . . . . . . . . . .158
Multi-Point Vehicle Inspection (MPVI) . . . . 387N
Navigation Connected Services . . . . . . . . . . . . . . . . . . . . 413
Destination . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Using the System . . . . . . . . . . . . . . . . . . . . . . 160
New Vehicle Break-In . . . . . . . . . . . . . . . . . . . . . 221
Noise Control System . . . . . . . . . . . . . . . . . . . . . 321
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Off-Road Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306
Engine Oil Life System . . . . . . . . . . . . . . . . . 308
Engine Oil Pressure Gauge . . . . . . . . . . . . . . 116
Pressure Light . . . . . . . . . . . . . . . . . . . . . . . . . 126
Older Children, Restraints . . . . . . . . . . . . . . . . . .75
Online Account . . . . . . . . . . . . . . . . . . . . . . . . . . 398
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407 Additional Information . . . . . . . . . . . . . . . . . 410
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408
OnStar Emergency . . . . . . . . . . . . . . . . . . . . . . . 409
OnStar Security . . . . . . . . . . . . . . . . . . . . . . . . . . 409 Operating Mode
Overheated Engine Protection . . . . . . . . . 315
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Overheated Engine Protection Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . 315
Overheating, Engine . . . . . . . . . . . . . . . . . . . . . . 313
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Instrument Panel . . . . . . . . . . . . . . . . . . . . . . . . 5P
ParkAssist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248, 256
Shifting Into . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
Shifting Out of . . . . . . . . . . . . . . . . . . . . . . . . 228
Parking Brake and P (Park) Mechanism
Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229
Over Things That Burn . . . . . . . . . . . . . . . . . 229
Parking or Backing
Assistance Systems . . . . . . . . . . . . . . . . . . . . 248
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . 119
Compartment Air Filter . . . . . . . . . . . . . . . . 201
Sensing System . . . . . . . . . . . . . . . . . . . . . . . . . 70
Perchlorate Materials Requirements, California . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302