child lock GMC SIERRA 2023 Owner's Manual

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Storage 101
Underseat Storage
There may be storage under the rear
passenger seat. Lift up on the seat bench to
access. Push the seat bench toward the floor
to close.
Rear Storage
There may be storage in the rear seat. Pull
the tab to access.
Push the storage door to close. The storage
door must be closed before installing child
restraints.
Center Console Storage
Bench Seat
Pull the strap on the side of the center
seatback to access the storage area and
cupholders. Do not use the center seatback
as a seating position when the seatback is
folded down.
To raise the seatback, push the seatback
rearward until it locks in the upright
position. Push and pull on the seatback to
make sure it is locked.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
256 Driving and Operating
.The accessory trailer camera(s) are not
installed according to the installation
instructions.
A feature may be unavailable or not
activating as expected if:
.The customization is disabled. Check the
customization settings where applicable.
.The accessory trailer cameras are
swapped at the hitch connector. Ensure
that the accessory camera(s) are
connected to the correct camera input.
A view may switch automatically if:
.The vehicle is shifted to another gear.
Park Assist
If the vehicle has Rear Park Assist (RPA) or
Front and Rear Park Assist (FRPA), as the
vehicle moves at speeds of less than 8 km/h
(5 mph) the sensors on the bumpers may
detect objects up to 1.2 m (4 ft) in front and
2.5 m (8 ft) behind the vehicle within a zone
25 cm (10 in) high off the ground and below
bumper level. These detection distances may
be shorter during warmer or humid weather.
Blocked sensors will not detect objects and
can also cause false detections. Keep the
sensors clean of mud, dirt, snow, ice, and
slush; and clean sensors after a car wash in
freezing temperatures.
{Warning
The Park Assist system does not detect
children, pedestrians, bicyclists, animals,
or objects located below the bumper or
that are too close or too far from the
vehicle. It is not available at speeds
greater than 8 km/h (5 mph). To prevent
injury, death, or vehicle damage, even
with Park Assist, always check the area
around the vehicle and check all mirrors
before moving forward or backing.
The instrument cluster may have a Park
Assist display with bars that show “distance
to object” and object location information
for the Front and Rear Park Assist system.
As the object gets closer, more bars light up
and the bars change color from yellow to
amber to red. When an object is first detected in the rear,
one beep will be heard from the rear,
or both sides of the Safety Alert Seat will
pulse two times. When an object is very
close
—<0.4 m (1.5 ft) in the vehicle rear or
<0.3 m (1 ft) in the vehicle front —five
beeps will sound from the rear or front
depending on object location, or both sides
of the Safety Alert Seat will pulse five times.
Beeps for FPA are higher pitched than
for RPA.
Turning the Features On or Off
PressXon the center stack to turn on or
off the Front and Rear Park Assist. The
indicator light next to the button comes on
when the features are on and turns off
when the features have been disabled.
Front and Rear Park Assist can be turned
Off, On, or On with Towbar. If Park Assist is
turned off through vehicle personalization,
the Park Assist button will be disabled. To
turn Park Assist on again, select On in

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Driving and Operating 267
{Warning
Fuel vapors and fuel fires burn violently
and can cause injury or death.
Follow these guidelines to help avoid
injuries to you and others:
.Read and follow all the instructions on
the fuel pump island.
.Turn off the engine when refueling.
.Keep sparks, flames, and smoking
materials away from fuel.
.Do not leave the fuel pump
unattended.
.Avoid using electronic devices while
refueling.
.Do not re-enter the vehicle while
pumping fuel.
.Keep children away from the fuel
pump and never let children
pump fuel.
.Before touching the fill nozzle, touch a
metallic object to discharge static
electricity from your body.(Continued)
Warning (Continued)
.Fuel can spray out if the fuel cap is
opened too quickly. This spray can
happen if the tank is nearly full, and is
more likely in hot weather. Open the
fuel cap slowly and wait for any hiss
noise to stop, then unscrew the cap all
the way.
Turn the fuel cap counterclockwise to
remove. Fully insert and latch the fill nozzle,
begin fueling. For models with dual fuel
tanks, the fuel gauge shows an average of
both tanks. When refueling, refuel the
primary front tank first, then add fuel to the
auxiliary rear tank.
{Warning
Overfilling the fuel tank by more than
three clicks of a standard fill nozzle may
cause:
.Vehicle performance issues, including
engine stalling and damage to the fuel
system.
.Fuel spills.
.Under certain conditions, fuel fires. Be careful not to spill fuel. Wait five seconds
after you have finished pumping before
removing the fill nozzle. Clean fuel from
painted surfaces as soon as possible. See
Exterior Care
0374. Reinstall the cap by
turning it clockwise until it clicks.
{Warning
If a fire starts while you are refueling, do
not remove the fill nozzle. Shut off the
flow of fuel by shutting off the pump or
by notifying the station attendant. Leave
the area immediately.
Caution
If a new fuel cap is needed, get the right
type of cap from your dealer. The wrong
type of fuel cap may not fit properly,
may turn on the malfunction indicator
lamp, and could damage the fuel system
and emissions system. See Malfunction
Indicator Lamp (Check Engine Light)
0 120.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
418 Index
Center ConsoleStorage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Chains, Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355
Charging System Light . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Wireless . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Check Engine Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Child Restraints Infants and Young Children . . . . . . . . . . . . . 77
Lower Anchors and Tethers forChildren . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Older Children . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Securing . . . . . . . . . . . . . . . . . . . . . . . . 92, 96, 99
Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Child Safety Locks . . . . . . . . . . . . . . . . . . . . . . . . .25
Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . 329
Cleaning
Exterior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
Interior Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
Climate Control Systems . . . . . . . . . . . . . . . . . 196
Air Conditioning . . . . . . . . . . . . . . . . . . . . . . . 196
Dual Automatic . . . . . . . . . . . . . . . . . . . . . . . . 197
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Cluster, Instrument . . . . . . . . . . . . . . . . . . . . . . . 111
Collision Damage Repair . . . . . . . . . . . . . . . . . 402 Compartments
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Connected Services Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
Navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
Connections Connected Services . . . . . . . . . . . . . . . . . . . . 413
Control Hill Descent . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Traction and Electronic Stability . . . . . . . 241
Control Light Hill Descent . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Control of a Vehicle . . . . . . . . . . . . . . . . . . . . . 205
Controls Steering Wheel . . . . . . . . . . . . . . . . . . . . . . . . . 151
Convex Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Coolant Engine Temperature Gauge . . . . . . . . . . . . . 117
Engine Temperature Warning Light . . . . 125
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196, 197
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
Courtesy Transportation Program . . . . . . . . 401
Coverage Explanations . . . . . . . . . . . . . . . . . . . . 171
Cruise Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 244 Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Cupholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Customer Assistance
Offices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 398
Text Telephone (TTY) Users . . . . . . . . . . . . 398
Customer Information Publications Ordering Information . . . . . 404
Customer Satisfaction Procedure . . . . . . . . . 396
Cybersecurity . . . . . . . . . . . . . . . . . . . . . . . . . . . . 406
D
Damage Repair, Collision . . . . . . . . . . . . . . . . . 402
Danger, Warning, and Caution . . . . . . . . . . . . . .2
Dashboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Data Collection Infotainment System . . . . . . . . . . . . . . . . . . 407
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407
Data Recorders, Event . . . . . . . . . . . . . . . . . . . 406
Database Coverage Explanations . . . . . . . . . . 171
Daytime Running Lamps (DRL) . . . . . . . . . . . . 141
Defensive Driving . . . . . . . . . . . . . . . . . . . . . . . . 205
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Destination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Diagnostics Connected Services . . . . . . . . . . . . . . . . . . . . 415
Disabled Vehicle Transporting . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
Distracted Driving . . . . . . . . . . . . . . . . . . . . . . . . 204
Dome Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145

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-
Localizing-U.S./Canada-16504257) - 2023 - CRC - 5/9/22
Index 425
RestraintsWhere to Put . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Retained Accessory Power (RAP) . . . . . . . . . 227
Reverse Tilt Mirrors . . . . . . . . . . . . . . . . . . . . . . . 40
Roads Driving, Wet . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Roadside Assistance Program . . . . . . . . . . . . 399
Roof
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Rotation, Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
Routing, Engine Drive Belt . . . . . . . . . . . . . . . 395
Running Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Running the Vehicle While Parked . . . . . . . 230
S
Safety Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Safety Defects Reporting Canadian Government . . . . . . . . . . . . . . . . . 405
General Motors . . . . . . . . . . . . . . . . . . . . . . . . 405
U.S. Government . . . . . . . . . . . . . . . . . . . . . . . 404
Safety System Check . . . . . . . . . . . . . . . . . . . . . 64
Satellite Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Scheduling Appointments . . . . . . . . . . . . . . . . 401
Seat Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Extender . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
How to Wear Seat Belts Properly . . . . . . . 59 Seat Belts (cont'd)
Lap-Shoulder Belt . . . . . . . . . . . . . . . . . . . . . . . 61
Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Replacing after a Crash . . . . . . . . . . . . . . . . . 65
Use During Pregnancy . . . . . . . . . . . . . . . . . . 64
Seats Adjustment, Front . . . . . . . . . . . . . . . . . . . . . . 50
Center Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Head Restraints . . . . . . . . . . . . . . . . . . . . . . . . . 49
Heated and Ventilated, Front . . . . . . . . . . . 56
Heated, Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Lumbar Adjustment, Front . . . . . . . . . . . . . . 53
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Power Adjustment, Front . . . . . . . . . . . . . . . . 51
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Reclining Seatbacks . . . . . . . . . . . . . . . . . . . . . 52
Underseat Storage . . . . . . . . . . . . . . . . . . . . . 101
Securing Child Restraints . . . . . . . . . . 92, 96, 99
Security Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Vehicle Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202 Accessories and Modifications . . . . . . . . . 302
Climate Control System . . . . . . . . . . . . . . . . 196
Doing Your Own Work . . . . . . . . . . . . . . . . . 303
Electric Parking Brake Light . . . . . . . . . . . . 122 Service (cont'd)
Maintenance Records . . . . . . . . . . . . . . . . . . 391
Maintenance, General Information . . . . . 384
Parts Identification . . . . . . . . . . . . . . . . . . . . . 392
Scheduling Appointments . . . . . . . . . . . . . . 401
Services Special Application . . . . . . . . . . . . . . . . . . . . . 388
Servicing System . . . . . . . . . . . . . . . . . . . . . . . . . 171
Servicing the Airbag . . . . . . . . . . . . . . . . . . . . . . .73
Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
Shift Lock Control Function Check, Automatic Transmission . . . . . . . . . . . . . . . . 322
Shifting Into Park . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
Out of Park . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
Side Blind Zone Alert (SBZA) . . . . . . . . . . . . . 260
Signals, Turn and Lane-Change . . . . . . . . . . . .143
Snow Plow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
Software Updates . . . . . . . . . . . . . . . . . . . . . . . . .154
Special Application Services . . . . . . . . . . . . . . 388
Specifications and Capacities . . . . . . . . . . . . . 393
Speedometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Start Assist, Hill . . . . . . . . . . . . . . . . . . . . . . . . . . 240
Start Vehicle, Remote . . . . . . . . . . . . . . . . . . . . . .22
Starting the Engine . . . . . . . . . . . . . . . . . . . . . . 225
Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Column Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Fluid, Power . . . . . . . . . . . . . . . . . . . . . . . . . . . 315