
GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 5/3/16
424 Vehicle Care
{Warning
Shifting a four-wheel-drive
vehicle's transfer case into
N (Neutral) can cause the vehicle
to roll even if the transmission is
in P (Park). You or others could
be injured. Set the parking brake
before shifting the transfer case
to N (Neutral).
To dinghy tow: 1. Position the vehicle being towed behind the tow vehicle,
facing forward and on a level
surface.
2. Securely attach the vehicle being towed to the tow vehicle.
3. Apply the parking brake and start the engine.
4. Shift the transfer case to N (Neutral). See “Shifting into
N (Neutral)” underFour-Wheel
Drive 0274. Check that the
vehicle is in N (Neutral) by
shifting the transmission to
R (Reverse) and then to D (Drive). There should be no
movement of the vehicle while
shifting.
5. Turn the engine off.
Caution
Failure to disconnect the negative
battery cable or to have it contact
the terminals can cause damage
to the vehicle.
6. Disconnect the negative battery cable at the battery and
secure the nut and bolt. Cover
the negative battery post with a
non-conductive material to
prevent any contact with the
negative battery terminal.
7. Shift the transmission to P (Park).
Caution
If the steering column is locked,
vehicle damage may occur. 8. Move the steering wheel to
make sure the steering column
is unlocked.
9. With a foot on the brake pedal, release the parking brake.
Keep the ignition key in the
towed vehicle in ACC/
ACCESSORY to prevent the
steering column from locking.
Disconnecting the Towed Vehicle
Before disconnecting the towed
vehicle: 1. Park on a level surface.
2. Set the parking brake, then shift the transmission to
P (Park), and move the ignition
key to OFF.
3. Connect the battery.
4. Apply the brake pedal.
5. Turn the ignition to ON/RUN with the engine off. Shift the
transfer case out of N (Neutral)
to Two-Wheel Drive High. See
“Shifting out of N (Neutral)”
under Four-Wheel Drive 0274.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 5/3/16
432 Vehicle Care
Caution
Lubrication of applicable steering/
suspension points should not be
done unless the temperature is
−12 °C (10 °F) or higher,
or damage could result.
For an eAssist vehicle, see the
Silverado/Sierra eAssist
supplement.
Body Component Lubrication
Lubricate all key lock cylinders,
hood hinges, liftgate hinges, and the
steel fuel door hinge unless the
components are plastic. Applying
silicone grease on weatherstrips
with a clean cloth will make them
last longer, seal better, and not stick
or squeak.
Underbody Maintenance
At least twice a year, spring and fall,
use plain water to flush any
corrosive materials from the
underbody. Take care to thoroughly
clean any areas where mud and
other debris can collect. If equipped with power assist steps, extend
them and then use a high pressure
wash to clean all joints and gaps.
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 fluid. Contaminated
fluid will decrease the life of the
transfer case and/or axles and
should be replaced.
Sheet Metal Damage
If the vehicle is damaged and
requires sheet metal repair or
replacement, make sure the body
repair shop applies anti-corrosion
material to parts repaired or
replaced to restore corrosion
protection.
Original manufacturer replacement
parts will provide the corrosion
protection while maintaining the
vehicle warranty.
Finish Damage
Quickly repair minor chips and
scratches with touch-up materials
available from your dealer to avoid
corrosion. Larger areas of finish
damage can be corrected in your
dealer's body and paint shop.
Chemical Paint Spotting
Airborne pollutants can fall upon
and attack painted vehicle surfaces
causing blotchy, ring-shaped
discolorations, and small, irregular
dark spots etched into the paint
surface. Refer to
“Finish Care”
previously in this section.
Interior Care
To prevent dirt particle abrasions,
regularly clean the vehicle's interior.
Immediately remove any soils.
Newspapers or dark garments can
transfer color to the vehicle’s
interior.
Use a soft bristle brush to remove
dust from knobs and crevices on the
instrument cluster. Using a mild
soap solution, immediately remove
hand lotions, sunscreen, and insect
repellent from all interior surfaces or
permanent damage may result.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 5/3/16
440 Service and Maintenance
.Lubricate body components. See
Exterior Care 0427.
. Check starter switch. See Starter
Switch Check 0371.
. Check automatic transmission
shift lock control function. See
Automatic Transmission Shift
Lock Control Function
Check 0371.
. Check ignition transmission lock.
See Ignition Transmission Lock
Check 0371.
. Check parking brake and
automatic transmission park
mechanism. See Park Brake and
P (Park) Mechanism
Check 0371.
. Check accelerator pedal for
damage, high effort, or binding.
Replace if needed.
. Visually inspect gas strut for
signs of wear, cracks, or other
damage. Check the hold open
ability of the strut. See your
dealer if service is required.
. Inspect sunroof track and seal,
if equipped. See Sunroof048. .
Verify spare tire key lock
operation and lubricate as
needed. See Tire
Changing 0408.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 5/3/16
448 Service and Maintenance
UsageFluid/Lubricant
Front Axle Driveshaft Splines (All
1500/2500/3500 Series) and Rear
Axle Driveshaft Splines (All 1500 Series) Spline Lubricant, Special Lubricant (GM Part No. 19257121, in
Canada 19257122).
Front Axle –Four-Wheel Drive SAE 75W-90 Synthetic Axle Lubricant (GM Part No. 88900401, in
Canada 89021678).
Hydraulic Brake System DOT 3 Hydraulic Brake Fluid (GM Part No. 19299818, in Canada 19299819).
Hydraulic Power Steering System (2500/3500 Series Only) GM Power Steering Fluid (GM Part No. 19329450, in Canada 19329451).
Key Lock Cylinders, Hood Hinges, Body Door Hinge Pins, Tailgate
Hinge and Linkage, Fuel Door Hinge,
Tailgate Handle Pivot Points, Hinges, Latch Bolt, and Linkage Multi-Purpose Lubricant, Superlube (GM Part No. 12346241, in
Canada 10953474).
Rear Axle (1500 Series) SAE 75W-85 Synthetic Axle Lubricant (GM Part No. 19300457, in Canada 19300458).
Rear Axle (2500/3500 Series) SAE 75W-90 Synthetic Axle Lubricant (GM Part No. 88900401, in Canada 89021678).
Transfer Case (Four-Wheel Drive) DEXRON
®-VI Automatic Transmission Fluid.
Weatherstrip Conditioning Weatherstrip Lubricant (GM Part No. 3634770, in Canada 10953518) or Dielectric Silicone Grease (GM Part No. 12345579, in Canada 10953481).

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 5/3/16
472 OnStar
.Obtain and customize the Wi-Fi®
hotspot name or SSID and
password, if equipped.
Press
Qto connect to an
Advisor to:
. Verify account information or
update contact information.
. Get driving directions.
. Receive a Diagnostic check of
the vehicle's key operating
systems.
. Receive Roadside Assistance.
. Manage Wi-Fi Settings,
if equipped.
Press
>to get a priority connection
to an OnStar Advisor available
24/7 to:
. Get help for an emergency.
. Be a Good Samaritan or
respond to an AMBER Alert.
. Get assistance in severe
weather or other crisis situations
and find evacuation routes.
OnStar Services
Emergency
Emergency Services require an
active, OnStar service plan
(excludes Basic Plan). With
Automatic Crash Response, built-in
sensors can automatically alert a
specially trained OnStar Advisor
who is immediately connected in to
the vehicle to help.
Press
>for a priority connection to
an OnStar Advisor who can contact
emergency service providers, direct
them to your exact location, and
relay important information.
With OnStar Crisis Assist, specially
trained Advisors are available
24 hours a day, 7 days a week, to
provide a central point of contact,
assistance, and information during a
crisis.
With Roadside Assistance, Advisors
can locate a nearby service provider
to help with a flat tire, a battery
jump, or an empty gas tank.
Security
If equipped, OnStar provides these
services:
. With Stolen Vehicle Assistance,
OnStar Advisors can use GPS to
pinpoint the vehicle and help
authorities quickly recover it.
. With Remote Ignition Block™,
if equipped, OnStar can block
the engine from being restarted.
. With Stolen Vehicle Slowdown
®,
if equipped, OnStar can work
with law enforcement to
gradually slow the vehicle down.
Theft Alarm Notification
If equipped, if the doors are locked
and the vehicle alarm sounds, a
notification by text, e-mail, or phone
call will be sent. If the vehicle is
stolen, an OnStar Advisor can work
with authorities to recover the
vehicle.
Navigation
OnStar navigation requires a
specific OnStar service plan.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 5/3/16
OnStar 475
OnStar Hands-Free Calling
Make and receive calls with the
built-in wireless calling service,
which requires available minutes.
Make a Call1. Press
=. System responds:
“OnStar ready.”
2. Say “Call.”System responds:
“Call. Please say the name or
number to call.”
3. Say the entire number without pausing, including a “1”and the
area code. System responds:
“OK, calling.”
Calling 911 Emergency
1. Press=. System responds:
“OnStar ready.”
2. Say “Call.”System responds:
“Call. Please say the name or
number to call.”
3. Say “911”without pausing.
System responds: “911.”
4. Say “Call.”System responds:
“OK, dialing 911.”
Retrieve My Number
1. Press=. System responds:
“OnStar ready.”
2. Say “My number.” System
responds: “Your OnStar
Hands-Free Calling number is,”
then says the number.
End a Call
Press=. System responds: “Call
ended.”
Verify Minutes and Expiration
Press=and say “Minutes” then
“Verify” to check how many minutes
remain and their expiration date.
Diagnostics
Advanced Diagnostics provides a
status of the vehicle’ s key systems
with a monthly e-mail, or by
pressing
Q. If equipped, Diagnostic
Alerts can be received in real-time
via e-mail or text. The Proactive
Alerts feature (if available) can help
predict and alert of potential upcoming maintenance issues with
select components on the vehicle,
before they become a problem.
OnStar can also monitor and report
tire pressure, if the vehicle is
equipped with a Tire Pressure
Monitoring System.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 5/3/16
486 Index
General Information (cont'd)Towing . . . . . . . . . . . . . . . . . . . . . . . . 304
Vehicle Care . . . . . . . . . . . . . . . . . . 340
Glass Replacement . . . . . . . . . . . . . 372
Glove Box . . . . . . . . . . . . . . . . . . . . . . 108
GM Mobility Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . . 461
H
Halogen Bulbs . . . . . . . . . . . . . . . . . . 373
Hazard Warning Flashers . . . . . . . 170
Head Restraints . . . . . . . . . . . . . . . . . 51
HeadlampsAiming . . . . . . . . . . . . . . . . . . . . . . . . 373
Automatic . . . . . . . . . . . . . . . . . . . . . 169
Bulb Replacement . . . . . . . . . . . . 373
Daytime Running
Lamps (DRL) . . . . . . . . . . . . . . . . 169
Flash-to-Pass . . . . . . . . . . . . . . . . . 169
High Intensity Discharge
(HID) Lighting . . . . . . . . . . . . . . . 373
High-Beam On Light . . . . . . . . . . 140
High/Low Beam Changer . . . . . 168
Lamps On Reminder . . . . . . . . . 140
Heated Steering Wheel . . . . . . . . . . . . . . . .114
Heated and Ventilated Front Seats . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Heated Mirrors . . . . . . . . . . . . . . . . . . . 43 Heater
Engine Coolant . . . . . . . . . . . . . . . 262
High Voltage Devices and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 376
High-Beam On Light . . . . . . . . . . . . 140
High-Speed Operation . . . . . . . . . . 393
Hill and Mountain Roads . . . . . . . . 247
Hill Descent Control (HDC) . . . . . 286
Hill Descent Control Light . . . . . . . 136
Hill Start Assist (HSA) . . . . . . . . . . 283
Home Page . . . . . . . . . . . . . . . . 181, 183
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . 342
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
How to Wear Safety Belts Properly . . . . . . . . . . . . . . . . . . . . . . . . 60
I
Idle SystemFast . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Ignition Positions . . . . . . . . . . . . . . . 259
Ignition Transmission Lock Check . . . . . . . . . . . . . . . . . . . . . . . . . 371
Immobilizer . . . . . . . . . . . . . . . . . . . . . . 40
Indicator Vehicle Ahead . . . . . . . . . . . . . . . . 137
Infants and Young Children,
Restraints . . . . . . . . . . . . . . . . . . . . . . 83
Infotainment . . . . . . . . . . . . . . . . . . . . 176
Infotainment System . . . . . . . . . . . . 470 Instrument Cluster . . . . . . . . . . . . . . 121
Instrument Panel
Storage Area . . . . . . . . . . . . . . . . . 108
Interior Rearview Mirrors . . . . . . . . . 45
Introduction . . . . . . . . . . . . . . . . . . . . . . . 2
J
Jack Auxiliary . . . . . . . . . . . . . . . . . . . . . . 202
Jump Starting - North America . . . . . . . . . . . . . . . . . . . . . . . 418
K
Key and Lock Messages . . . . . . . . 148
Keyless EntryRemote (RKE) System . . . . . . . . . 31
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
L
Labeling, Tire Sidewall . . . . . . . . . . 385
Lamps
Auxiliary RoofMounted Lamp . . . . . . . . . . . . . . 171
Cargo . . . . . . . . . . . . . . . . . . . . . . . . . 172
Daytime Running (DRL) . . . . . . 169
Dome . . . . . . . . . . . . . . . . . . . . . . . . . 173
Exterior Controls . . . . . . . . . . . . . . 166
Exterior Lamps Off Reminder . . . . . . . . . . . . . . . . . . . 168
Malfunction Indicator . . . . . . . . . 133

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 5/3/16
488 Index
Memory Seats . . . . . . . . . . . . . . . . . . . 54
MessagesAirbag System . . . . . . . . . . . . . . . . 150
Battery Voltage andCharging . . . . . . . . . . . . . . . . . . . . 145
Brake System . . . . . . . . . . . . . . . . 145
Compass . . . . . . . . . . . . . . . . . . . . . 146
Door Ajar . . . . . . . . . . . . . . . . . . . . . 146
Engine Cooling System . . . . . . . 146
Engine Oil . . . . . . . . . . . . . . . . . . . . 147
Engine Power . . . . . . . . . . . . . . . . 147
Fuel System . . . . . . . . . . . . . . . . . . 147
Key and Lock . . . . . . . . . . . . . . . . . 148
Lamp . . . . . . . . . . . . . . . . . . . . . . . . . 148
Object Detection System . . . . . 148
Ride Control System . . . . . . . . . . 149
Safety Belt . . . . . . . . . . . . . . . . . . . . 150
Security . . . . . . . . . . . . . . . . . . . . . . 150
Steering System . . . . . . . . . . . . . . 151
Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Transmission . . . . . . . . . . . . . . . . . 152
Vehicle . . . . . . . . . . . . . . . . . . . . . . . 144
Vehicle Reminder . . . . . . . . . . . . . 153
Vehicle Speed . . . . . . . . . . . . . . . . 154
Washer Fluid . . . . . . . . . . . . . . . . . 154
Mirrors Automatic Dimming . . . . . . . . . . . . . 44 Mirrors (cont'd)
Automatic Dimming
Rearview . . . . . . . . . . . . . . . . . . . . . . 45
Blind Spot . . . . . . . . . . . . . . . . . . . . . . 44
Convex . . . . . . . . . . . . . . . . . . . . . . . . . 41
Folding . . . . . . . . . . . . . . . . . . . . . . . . . 43
Heated . . . . . . . . . . . . . . . . . . . . . . . . . 43
Manual . . . . . . . . . . . . . . . . . . . . . . . . . 41
Manual Rearview . . . . . . . . . . . . . . . 45
Power . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Tilt in Reverse . . . . . . . . . . . . . . . . . . 45
Trailer Tow . . . . . . . . . . . . . . . . . . . . . . 41
Mirrors, Interior Rearview . . . . . . . . 45
Monitor System, Tire Pressure . . . . . . . . . . . . . . . . . . . . . . 393
Multi-band Antenna . . . . . . . . . . . . . 190
N
Navigation OnStar®. . . . . . . . . . . . . . . . . . . . . . 472
New Vehicle Break-In . . . . . . . . . . . 258
Noise Control System . . . . . . . . . . 370
O
Object Detection System Messages . . . . . . . . . . . . . . . . . . . . . 148
Odometer . . . . . . . . . . . . . . . . . . . . . . . 125 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Off-Road . . . . . . . . . . . . . . . . . . . . . . . 242 Off-Road (cont'd)
Driving . . . . . . . . . . . . . . . . . . . . . . . . 242
Recovery . . . . . . . . . . . . . . . . . . . . . 241
Oil
Engine . . . . . . . . . . . . . . . . . . . . . . . . 348
Engine Oil Life System . . . . . . . 351
Engine Oil Pressure Gauge . . . 126
Messages . . . . . . . . . . . . . . . . . . . . 147
Pressure Light . . . . . . . . . . . . . . . . 139
Older Children, Restraints . . . . . . . 81
Online Owner Center . . . . . . . . . . . 460
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . 470
OnStar
®Additional
Information . . . . . . . . . . . . . . . . . . . . 476
OnStar
®Connections . . . . . . . . . . . 473
OnStar®Diagnostics . . . . . . . . . . . . 475
OnStar®Emergency . . . . . . . . . . . . 472
OnStar®Navigation . . . . . . . . . . . . . 472
OnStar®Overview . . . . . . . . . . . . . . 471
OnStar®Security . . . . . . . . . . . . . . . 472
Operating Mode Overheated EngineProtection . . . . . . . . . . . . . . . . . . . 362
Operation Fog Lamps . . . . . . . . . . . . . . . . . . . 171
Ordering Service Publications . . . . . . . . . . 466