2015 GMC SIERRA DENALI brake

Black plate (1,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
2015 GMC Sierra Denali Owner Manual MIn Brief . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Instrument Panel . . . . . . . . . . . . . . 1-2
Initial Drive Information . . . . . . . . 1-4
Vehicle Features . . . . . . . . . . . . . 1-16
Performance and
Maintenance . . . . . . . . . . . . . . . . 1-20
Keys, Doors, and
Windows . . . . . . . . . . . . . . . . . . . . 2-1
Keys and Locks . . . . . . . . . . . . . . . 2-1
Doors . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Vehicle Security . . . . . . . . . . . . . . 2-11
Exterior Mirrors . . . . . . . . . . . . . . . 2-14
Interior Mirrors . . . . . . . . . . . . . . . . 2-19
Windows . . . . . . . . . . . . . . . . . . . . . 2-19
Roof . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
Seats and Restraints . . . . . . . . . 3-1
Head Restraints . . . . . . . . . . . . . . . 3-2
Front Seats . . . . . . . . . . . . . . . . . . . . 3-3
Rear Seats . . . . . . . . . . . . . . . . . . . . 3-9
Safety Belts . . . . . . . . . . . . . . . . . . 3-10
Airbag System . . . . . . . . . . . . . . . . 3-17
Child Restraints . . . . . . . . . . . . . . 3-30 Storage . . . . . . . . . . . . . . . . . . . . . . . 4-1
Storage Compartments . . . . . . . . 4-1
Additional Storage Features . . . 4-3
Instruments and Controls . . . . 5-1
Controls . . . . . . . . . . . . . . . . . . . . . . . 5-2
Warning Lights, Gauges, and
Indicators . . . . . . . . . . . . . . . . . . . . 5-8
Information Displays . . . . . . . . . . 5-27
Vehicle Messages . . . . . . . . . . . . 5-31
Vehicle Personalization . . . . . . . 5-42
Universal Remote System . . . . 5-49
Lighting . . . . . . . . . . . . . . . . . . . . . . . 6-1
Exterior Lighting . . . . . . . . . . . . . . . 6-1
Interior Lighting . . . . . . . . . . . . . . . . 6-6
Lighting Features . . . . . . . . . . . . . . 6-8
Infotainment System . . . . . . . . . 7-1
Introduction . . . . . . . . . . . . . . . . . . . . 7-1 Climate Controls . . . . . . . . . . . . . 8-1
Climate Control Systems . . . . . . 8-1
Air Vents . . . . . . . . . . . . . . . . . . . . . . . 8-4
Maintenance . . . . . . . . . . . . . . . . . . . 8-5
Driving and Operating . . . . . . . . 9-1
Driving Information . . . . . . . . . . . . . 9-2
Starting and Operating . . . . . . . 9-23
Engine Exhaust . . . . . . . . . . . . . . 9-32
Automatic Transmission . . . . . . 9-33
Drive Systems . . . . . . . . . . . . . . . . 9-40
Brakes . . . . . . . . . . . . . . . . . . . . . . . 9-46
Ride Control Systems . . . . . . . . 9-49
Cruise Control . . . . . . . . . . . . . . . . 9-52
Driver Assistance Systems . . . 9-55
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . 9-63
Trailer Towing . . . . . . . . . . . . . . . . 9-68
Conversions and Add-Ons . . . 9-88
Vehicle Care . . . . . . . . . . . . . . . . . 10-1
General Information . . . . . . . . . . 10-2
Vehicle Checks . . . . . . . . . . . . . . . 10-3
Headlamp Aiming . . . . . . . . . . . 10-36
Bulb Replacement . . . . . . . . . . 10-36
Electrical System . . . . . . . . . . . . 10-40
Wheels and Tires . . . . . . . . . . . 10-50

Black plate (4,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
iv Introduction
Danger, Warnings, and
Cautions Warning messages found on vehicle
labels and in this manual describe
hazards and what to do to avoid or
reduce them.
{ DangerDanger indicates a hazard with a
high level of risk which will result
in serious injury or death.
{ Warning
Warning indicates a hazard that
could result in injury or death.
{ Caution
Caution indicates a hazard that
could result in property or vehicle
damage. A circle with a slash through it is a
safety symbol which means “ Do
Not, ” “ Do not do this, ” or “ Do not let
this happen. ”
Symbols The vehicle has components and
labels that use symbols instead of
text. Symbols are shown along with
the text describing the operation or
information relating to a specific
component, control, message,
gauge, or indicator.
M : This symbol is shown when
you need to see your owner manual
for additional instructions or
information.
* : This symbol is shown when
you need to see a service manual
for additional instructions or
information. Vehicle Symbol Chart
Here are some additional symbols
that may be found on the vehicle
and what they mean. For more
information on the symbol, refer to
the Index.
0 : Adjustable Pedals
9 : Airbag Readiness Light
! : Antilock Brake System (ABS)
g : Audio Steering Wheel Controls
or OnStar ®
(if equipped)
$ : Brake System Warning Light
" : Charging System
I : Cruise Control
B : Engine Coolant Temperature
O : Exterior Lamps
# : Fog Lamps
. : Fuel Gauge
+ : Fuses
3 : Headlamp High/Low-Beam
Changer
( : Heated Steering Wheel

Black plate (1,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
In Brief 1-1
In Brief Instrument Panel Instrument Panel . . . . . . . . . . . . . . 1-2
Initial Drive Information Remote Keyless Entry (RKE)
System . . . . . . . . . . . . . . . . . . . . . . 1-4
Remote Vehicle Start . . . . . . . . . 1-5
Door Locks . . . . . . . . . . . . . . . . . . . 1-5
Windows . . . . . . . . . . . . . . . . . . . . . . 1-6
Seat Adjustment . . . . . . . . . . . . . . 1-7
Memory Features . . . . . . . . . . . . . 1-8
Heated and Cooled Front
Seats . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Head Restraint Adjustment . . . . 1-9
Safety Belts . . . . . . . . . . . . . . . . . . . 1-9
Passenger Sensing System . . . 1-9
Mirror Adjustment . . . . . . . . . . . . 1-10 Steering Wheel
Adjustment . . . . . . . . . . . . . . . . . 1-11
Throttle and Brake Pedal
Adjustment . . . . . . . . . . . . . . . . . 1-12
Interior Lighting . . . . . . . . . . . . . . 1-12
Exterior Lighting . . . . . . . . . . . . . 1-13
Windshield Wiper/Washer . . . . 1-13
Climate Controls . . . . . . . . . . . . . 1-14
Transmission . . . . . . . . . . . . . . . . 1-15
Four-Wheel Drive . . . . . . . . . . . . 1-15
Vehicle Features Infotainment System . . . . . . . . . 1-16
Steering Wheel Controls . . . . . 1-16
Cruise Control . . . . . . . . . . . . . . . 1-17
Driver Information
Center (DIC) . . . . . . . . . . . . . . . 1-17
Forward Collision Alert (FCA)
System . . . . . . . . . . . . . . . . . . . . . 1-18 Lane Departure
Warning (LDW) . . . . . . . . . . . . . 1-18
Rear Vision
Camera (RVC) . . . . . . . . . . . . . 1-18
Parking Assist . . . . . . . . . . . . . . . 1-18
Power Outlets . . . . . . . . . . . . . . . 1-18
Universal Remote System . . . 1-19
Sunroof . . . . . . . . . . . . . . . . . . . . . . 1-19
Performance and Maintenance Traction Control/Electronic
Stability Control . . . . . . . . . . . . 1-20
Tire Pressure Monitor . . . . . . . . 1-20
Engine Oil Life System . . . . . . 1-21
E85 or FlexFuel . . . . . . . . . . . . . . 1-21
Driving for Better Fuel
Economy . . . . . . . . . . . . . . . . . . . 1-21
Roadside Assistance
Program . . . . . . . . . . . . . . . . . . . . 1-22
OnStar ®
. . . . . . . . . . . . . . . . . . . . . 1-22

Black plate (3,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
In Brief 1-31. Instrument Panel Illumination
Control on page 6-6 .
2. Integrated Trailer Brake Control
(ITBC) System (If Equipped).
See Towing Equipment on
page 9-78 .
3. Exterior Lamp Controls on
page 6-1 .
Fog Lamps on page 6-5 (If
Equipped).
4. Air Vents on page 8-4 .
5. Turn Signal Lever. See Turn and
Lane-Change Signals on
page 6-4 .
Windshield Wiper/Washer on
page 5-3 .
6. Favorite Switches (Out of View).
See Steering Wheel Controls on
page 5-2 .
Volume Switches (Out of View).
See Steering Wheel Controls on
page 5-2 .
7. Instrument Cluster on page 5-9 . 8. Hazard Warning Flashers on
page 6-4
9. Shift Lever. See Automatic
Transmission on page 9-33 .
Tow/Haul Selector Button (If
Equipped). See Tow/Haul Mode
on page 9-39 .
Range Selection Mode (If
Equipped). See Manual Mode on
page 9-36 .
10. Light Sensor. See Automatic
Headlamp System on
page 6-3 .
11. Infotainment on page 7-1 .
12. Electronic Transfer Case
Control (If Equipped). See
Four-Wheel Drive on
page 9-40 .
13. Parking Brake on page 9-47 .
14. Data Link Connector (DLC)
(Out of View). See Malfunction
Indicator Lamp on page 5-18 . 15. Cruise Control on page 9-52 .
Forward Collision Alert (FCA)
System on page 9-59 (If
Equipped).
16. Steering Wheel Adjustment on
page 5-2 (Out of View).
17. Horn on page 5-3 .
18. Hood Release. See Hood on
page 10-4 .
19. Steering Wheel Controls on
page 5-2 (If Equipped).
Driver Information Center (DIC)
Controls. See Driver
Information Center (DIC) on
page 5-27 .
20. Heated and Cooled Front
Seats on page 3-7 (If
Equipped).
21. Dual Automatic Climate Control
System on page 8-1 .

Black plate (4,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
1-4 In Brief 22.
g Traction Control/Electronic
Stability Control on page 9-49 .
0 Pedal Adjust Switch (If
Equipped). See Adjustable
Throttle and Brake Pedal on
page 9-23 .
{ Cargo Lamp on page 6-6 .
X Parking Assist Button (If
Equipped). See Assistance
Systems for Parking or Backing
on page 9-56 .
@ Lane Departure Warning
(LDW) on page 9-61 (If
Equipped).
5 Hill Descent Control Switch
(If Equipped). See Hill Descent
Control (HDC) on page 9-51 .
q Exhaust Brake (If
Equipped). See “ Exhaust
Brake ” in the Duramax diesel
supplement. Auxiliary Button (If Equipped).
See Add-On Electrical
Equipment on page 9-88 .
23. USB Port. See Infotainment on
page 7-1 .
24. Power Outlets on page 5-5 .
25. Power Outlet (Alternating
Current) (If Equipped). See
Power Outlets on page 5-5 .
Initial Drive
Information Remote Keyless Entry
(RKE) System The RKE transmitter functions may
work from up to 60 m (197 ft) away
from the vehicle.
K : Press to unlock the driver door.
Press
K again within three seconds
to unlock all remaining doors.

Black plate (12,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
1-12 In Brief
Throttle and Brake Pedal
Adjustment If equipped, the position of the
throttle and brake pedals can be
changed.
The switch used to adjust the
pedals is on the center stack, below
the climate controls.
Lift the switch up to move the
pedals closer to your body. Press
the switch down to move the
pedals away. See Adjustable Throttle and Brake
Pedal on page 9-23 .
Interior Lighting Dome Lamps
There are dome lamps in the
overhead console and the headliner,
if equipped.
To change the dome lamp settings,
press the following:
OFF: Turns the lamps off, even
when a door is open. DOOR: The lamps come on
automatically when a door is
opened.
ON: Turns all dome lamps on.
Reading Lamps
There are reading lamps in the
overhead console and the headliner,
if equipped. To operate, the ignition
must be in the ACC/ACCESSORY
or ON/RUN position or using
Retained Accessory Power (RAP).

Black plate (21,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
In Brief 1-21The low tire pressure warning light
alerts to a significant loss in
pressure of one of the vehicle's
tires. If the warning light comes on,
stop as soon as possible and inflate
the tires to the recommended
pressure shown on the Tire and
Loading Information label. See
Vehicle Load Limits on page 9-15 .
The warning light will remain on until
the tire pressure is corrected.
The low tire pressure warning light
may come on in cool weather when
the vehicle is first started, and then
turn off as the vehicle is driven. This
may be an early indicator that the
tire pressures are getting low and
the tires need to be inflated to the
proper pressure.
The TPMS does not replace normal
monthly tire maintenance. Maintain
the correct tire pressures.
See Tire Pressure Monitor System
on page 10-61 . Engine Oil Life System The engine oil life system calculates
engine oil life based on vehicle use
and displays a DIC message when
it is necessary to change the engine
oil and filter. The oil life system
should be reset to 100% only
following an oil change.
Resetting the Oil Life System
1. Display OIL LIFE REMAINING
on the DIC. See Driver
Information Center (DIC) on
page 5-27 .
2. Press and hold
V for several
seconds. The oil life will change
to 100%.
The oil life system can also be reset
as follows:
1. Turn the ignition to ON/RUN with
the engine off.
2. Fully press the accelerator pedal
slowly three times within
five seconds. 3. Display the OIL LIFE
REMAINING on the DIC. If the
display shows 100%, the system
is reset.
See Engine Oil Life System on
page 10-11 .
E85 or FlexFuel Vehicles with a yellow fuel cap can
use either unleaded gasoline or
ethanol fuel containing up to 85%
ethanol (E85). See E85 or FlexFuel
on page 9-65 . For all other vehicles,
use only the unleaded gasoline
described under Fuel on page 9-63 .
Driving for Better Fuel
Economy Driving habits can affect fuel
mileage. Here are some driving tips
to get the best fuel economy
possible. .
Avoid fast starts and accelerate
smoothly. .
Brake gradually and avoid
abrupt stops.

Black plate (23,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Seats and Restraints 3-23be some smoke and dust coming
from the vents in the deflated
airbags. Airbag inflation does not
prevent the driver from seeing out of
the windshield or being able to steer
the vehicle, nor does it prevent
people from leaving the vehicle.
{ WarningWhen an airbag inflates, there
may be dust in the air. This dust
could cause breathing problems
for people with a history of
asthma or other breathing trouble.
To avoid this, everyone in the
vehicle should get out as soon as
it is safe to do so. If you have
breathing problems but cannot
get out of the vehicle after an
airbag inflates, then get fresh air
by opening a window or a door.
If you experience breathing
problems following an airbag
deployment, you should seek
medical attention. The vehicle has a feature that may
automatically unlock the doors, turn
on the interior lamps and hazard
warning flashers, and shut off the
fuel system after the airbags inflate.
The feature may also activate,
without airbag inflation, after an
event that exceeds a predetermined
threshold. You can lock the doors,
and turn off the interior lamps, and
turn off the hazard warning flashers
by using the controls for those
features.
{ WarningA crash severe enough to inflate
the airbags may have also
damaged important functions in
the vehicle, such as the fuel
system, brake and steering
systems, etc. Even if the vehicle
appears to be drivable after a
moderate crash, there may be
(Continued) Warning (Continued) concealed damage that could
make it difficult to safely operate
the vehicle.
Use caution if you should attempt
to restart the engine after a crash
has occurred.
In many crashes severe enough to
inflate the airbag, windshields are
broken by vehicle deformation.
Additional windshield breakage may
also occur from the front outboard
passenger airbag. .
Airbags are designed to inflate
only once. After an airbag
inflates, you will need some new
parts for the airbag system.
If you do not get them, the
airbag system will not be there
to help protect you in another
crash. A new system will include
airbag modules and possibly