2015 GMC SIERRA DENALI 4WD

Black plate (31,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Instruments and Controls 5-31Transmission Fluid Temperature
Gauge: Shows the temperature of
the automatic transmission fluid in
either degrees Celsius (°C) or
degrees Fahrenheit (°F).
Off Road: Displays vehicle pitch
and roll information, road wheel
angle, and four-wheel drive (4WD)
status.
Vehicle Messages Messages displayed on the DIC
indicate the status of the vehicle or
some action may be needed to
correct a condition. Multiple
messages may appear one after
another.
The messages that do not require
immediate action can be
acknowledged and cleared by
pressing
V .
The messages that require
immediate action cannot be cleared
until that action is performed.
All messages should be taken
seriously and clearing the message
does not correct the problem.
The following are the possible
messages and some information
about them.
If the vehicle has a diesel engine,
see the Duramax diesel
supplement. Battery Voltage and
Charging Messages BATTERY LOW START
VEHICLE When the vehicle ’ s battery is
severely discharged, this message
will display and four chimes will
sound. Start the vehicle
immediately. If the vehicle is not
started and the battery continues to
discharge, the climate controls,
heated seats, and audio systems
will shut off and the vehicle may
require a jump start. These systems
will function again after the vehicle
is started.
BATTERY SAVER ACTIVE
This message displays when the
battery voltage drops below
expected levels and features are
disabled. Turn off all unnecessary
accessory features.

Black plate (39,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Instruments and Controls 5-39If the warning comes on and stays
on, there may be a problem with the
TPMS. See your dealer.
TIRE LEARNING ACTIVE If equipped with the Tire Pressure
Monitor System (TPMS), this
message displays when the system
is relearning the tire positions on
your vehicle. The tire positions must
be relearned after rotating the tires
or after replacing a tire or sensor.
See Tire Inspection on page 10-65 ,
Tire Rotation on page 10-65 , Tire
Pressure Monitor System on
page 10-61 , and Tire Pressure on
page 10-59 . TIRE PRESSURE LOW ADD
AIR TO TIRE If equipped with the Tire Pressure
Monitor System (TPMS), this
message displays when the
pressure in one or more of the
vehicle's tires is low. This message
also displays with a vehicle picture
to indicate the location of the low
tire. The low tire pressure warning
light will also come on. See Tire
Pressure Light on page 5-25 . You
can receive more than one tire
pressure message at a time. If a tire
pressure message appears on the
DIC, stop as soon as you can. Have
the tire pressures checked and set
to those shown on the Tire and
Loading Information label. See Tires
on page 10-50 , Vehicle Load Limits
on page 9-15 , and Tire Pressure on
page 10-59 . The DIC also shows
the tire pressure values. See Driver
Information Center (DIC) on
page 5-27 . Transmission Messages 4WD OFF If equipped with four-wheel drive,
this message displays when the
four-wheel-drive system is
temporarily disabled due to an
overheated condition. The vehicle
will run in two-wheel drive when this
message is present. Once the
four-wheel-drive system cools down,
the message turns off and the
four-wheel-drive system returns to
normal operation.
4WD SHIFT IN PROGRESS This message will display while the
four-wheel-drive system is shifting.
FOR 4WD LOW SHIFT TO
NEUTRAL
If a four-wheel drive shift into 4
n is
requested, and the vehicle speed is
correct, but the transmission is not
in N (Neutral), this message will
display until the transmission is
shifted to N (Neutral).

Black plate (40,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
5-40 Instruments and Controls FOR 4WD LOW SLOW TO XXX If a four-wheel drive shift into 4
n is
requested, but the vehicle speed is
too high, this message will display
until the correct vehicle speed is
reached.
GRADE BRAKING ACTIVE This message displays when grade
braking has been activated while
driving on downhill grades. This
message will only appear the first
time the feature is activated in an
ignition cycle. See Tow/Haul Mode
on page 9-39 , Automatic
Transmission on page 9-33 , and
Cruise Control on page 9-52 .
GRADE BRAKING OFF
This message displays when grade
braking has been disabled with the
Tow/Haul Mode button on the end of
the shift lever. See Tow/Haul Mode
on page 9-39 , Automatic
Transmission on page 9-33 , and
Cruise Control on page 9-52 . GRADE BRAKING ON This message displays when grade
braking has been enabled with the
Tow/Haul Mode button on the end of
the shift lever. See Tow/Haul Mode
on page 9-39 , Automatic
Transmission on page 9-33 , and
Cruise Control on page 9-52 .
SERVICE 4WD If the vehicle has four-wheel drive,
this message may display if a
problem occurs with the
four-wheel-drive system. If this
message appears, stop as soon as
possible and turn off the vehicle.
Make sure the key is in the LOCK/
OFF position for at least
one minute, then restart the vehicle
and check for the message on the
DIC display. If the message is still
displayed or appears again when
you begin driving, the
four-wheel-drive system needs
service. See your dealer. SHIFT DENIED This message displays when the
shift lever is in M (Manual Mode)
and a transmission range has been
selected that is unavailable at the
current vehicle speed.
TO EXIT 4WD LOW SHIFT TO
NEUTRAL If a four-wheel drive shift out of 4
n is
requested, and the vehicle speed is
correct, but the transmission is not
in N (Neutral), this message will
display until the transmission is
shifted to N (Neutral).
TO EXIT 4WD LOW SLOW
TO XXX
If a four-wheel drive shift out of 4
n is
requested, but the vehicle speed is
too high, this message will display
until the correct vehicle speed is
reached.

Black plate (41,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Instruments and Controls 5-41TRANSMISSION HOT IDLE
ENGINE This message displays and a chime
may sound if the transmission fluid
in the vehicle gets hot. Driving with
the transmission fluid temperature
high can cause damage to the
vehicle. Stop the vehicle and let it
idle to allow the transmission to
cool. This message clears and the
chime stops when the fluid
temperature reaches a safe level.
When towing, use Tow/Haul Mode
to prevent damage to the engine or
transmission. See Tow/Haul Mode
on page 9-39 .
VEHICLE IN 4WD LOW This message will display if the
vehicle is driven in 4
n for about
10 minutes above 72 km/h (45 mph). Vehicle Reminder
Messages CHECK TRAILER WIRING On vehicles with the Integrated
Trailer Brake Control (ITBC) system,
this message may display and a
chime may sound when one of the
following conditions exists: .
A trailer with electric brakes
becomes disconnected from the
vehicle.
‐ If the disconnect occurs while
the vehicle is stopped, this
message clears itself after a
short time.
‐ If the disconnect occurs while
the vehicle is moving, this
message stays on until the
ignition is turned off. .
There is a short in the wiring to
the electric trailer brakes.
When this message displays, power
is no longer available to the trailer
brakes. As soon as it is safe to do so,
carefully pull the vehicle over to the
side of the road and turn the ignition
off. Check the wiring connection to
the trailer and turn the ignition back
on. This message clears if the trailer
is reconnected. This message also
clears if you acknowledge it. If this
message still displays, either the
vehicle or the trailer needs service.
See your dealer.
See “ Integrated Trailer Brake
Control System ” under Towing
Equipment on page 9-78 .
ICE POSSIBLE DRIVE
WITH CARE This message displays when ice
conditions are possible.
TRAILER CONNECTED
On vehicles with the Integrated
Trailer Brake Control (ITBC) system,
this message displays briefly when
a trailer with electric or electric over
hydraulic brakes is first connected
to the vehicle.

Black plate (73,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Driving and Operating 9-73Vehicle Axle Ratio Maximum Trailer Weight GCWR (a)
1500 Series 2WD Crew Cab Standard Box
5.3L V8 3.23 4 219 kg (9,300 lb) 6 804 kg (15,000 lb)
6.2L V8 3.23 4 128 kg (9,100 lb) 6 804 kg (15,000 lb)
1500 Series 2WD Crew Cab Short Box (b)
5.3L V8 3.42 4 264 kg (9,400 lb) 6 804 kg (15,000 lb)
6.2L V8 3.23 4 173 kg (9,200 lb) 6 804 kg (15,000 lb)
1500 Series 4WD Crew Cab Standard Box
5.3L V8 3.42 4 128 kg (9,100 lb) 6 804 kg (15,000 lb)
6.2L V8 3.23 3 992 kg (8,800 lb) 6 804 kg (15,000 lb)
1500 Series 4WD Crew Cab Short Box (b)
5.3L V8 3.42 4 173 kg (9,200 lb) 6 804 kg (15,000 lb)
6.2L V8 3.23 4 037 kg (8,900 lb) 6 804 kg (15,000 lb)
2500 Series 2WD Crew Cab Standard Box
6.0L V8 3.73 4 445 kg (9,800 lb) 7 257 kg (16,000 lb)
6.0L V8 – Conventional Trailer 4.10 5 897 kg (13,000 lb) 9 299 kg (20,500 lb)
6.0L V8 – Fifth-Wheel Trailer 4.10 6 486 kg (14,300 lb) 9 299 kg (20,500 lb)

Black plate (74,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
9-74 Driving and Operating Vehicle Axle Ratio Maximum Trailer Weight GCWR (a)
2500 Series 4WD Crew Cab Standard Box
6.0L V8 3.73 4 309 kg (9,500 lb) 7 257 kg (16,000 lb)
6.0L V8 – Conventional Trailer 4.10 5 897 kg (13,000 lb) 9 299 kg (20,500 lb)
6.0L V8 – Fifth-Wheel Trailer 4.10 6 350 kg (14,000 lb) 9 299 kg (20,500 lb)
3500 Series 2WD Crew Cab Standard Box
6.0L V8 3.73 4 355 kg (9,600 lb) 7 257 kg (16,000 lb)
6.0L V8 – Conventional Trailer 4.10 5 897 kg (13,000 lb) 9 299 kg (20,500 lb)
6.0L V8 Fifth-Wheel Trailer 4.10 6 396 kg (14,100 lb) 9 299 kg (20,500 lb)
3500 Series 2WD Crew Cab Long Box
6.0L V8 (Single Rear Wheels) 3.73 4 309 kg (9,500 lb) 7 257 kg (16,000 lb)
6.0L V8 (Single Rear Wheels)
Conventional Trailer 4.10 5 897 kg (13,000 lb) 9 299 kg (20,500 lb)
6.0L V8 (Single Rear Wheels)
Fifth-Wheel Trailer 4.10 6 350 kg (14,000 lb) 9 299 kg (20,500 lb)
6.0L V8 (Dual Rear Wheels) 3.73 4 173 kg (9,200 lb) 7 257 kg (16,000 lb)
6.0L V8 (Dual Rear Wheels) 4.10 6 214 kg (13,700 lb) 9 299 kg (20,500 lb)
3500 Series 4WD Crew Cab Standard Box
6.0L V8 3.73 4 264 kg (9,400 lb) 7 257 kg (16,000 lb)

Black plate (75,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Driving and Operating 9-75Vehicle Axle Ratio Maximum Trailer Weight GCWR (a)
6.0L V8 – Conventional Trailer 4.10 5 897 kg (13,000 lb) 9 299 kg (20,500 lb)
6.0L V8 – Fifth-Wheel Trailer 4.10 6 305 kg (13,900 lb) 9 299 kg (20,500 lb)
3500 Series 4WD Crew Cab Long Box
6.0L V8 (Single Rear Wheels) 3.73 4 173 kg (9,200 lb) 7 257 kg (16,000 lb)
6.0L V8 (Single Rear Wheels)
Conventional Trailer 4.10 5 897 kg (13,000 lb) 9 299 kg (20,500 lb)
6.0L V8 (Single Rear Wheels)
Fifth-Wheel Trailer 4.10 6 214 kg (13,700 lb) 9 299 kg (20,500 lb)
6.0L V8 (Dual Rear Wheels) 3.73 3 992 kg (8,800 lb) 7 257 kg (16,000 lb)
6.0L V8 (Dual Rear Wheels) 4.10 6 033 kg (13,300 lb) 9 299 kg (20,500 lb)
(a) The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle
and trailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not be
exceeded.
(b) This model is neither designed nor intended to tow fifth-wheel or gooseneck trailers.
Ask your dealer for trailering information or advice.

Black plate (43,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Vehicle Care 10-43Micro
J-Case
Fuses Usage
1 Trailer Brake
2 Trailer Battery
J-Case
Fuses Usage
3 Antilock Brake
System Pump
4 Instrument Panel
BEC 1
5 Spare
6 4WD Trec
7 Spare
8 Instrument Panel
BEC 2
9 Spare
10 Rear Window
Defogger
11 Starter J-Case
Fuses Usage
12 Cooling Fan 1
13 Cooling Fan 2
Mini Fuses
(2 Pin) Usage
14 Trailer Stop/Turn
Lamps, Left
15 Trailer Parking
Lamps
16 Trailer
Back-up Lamp
17 Trailer Stop/Turn
Lamps, Right
Micro Fuses
(2 Pin) Usage
18 Fuel Pump
19 Integrated Chassis
Control Module Micro Fuses
(2 Pin) Usage
20 Electronic
Suspension
Control Module
21 Fuel Pump Power
Module
22 Upfitter Switch 1
23 Upfitter 2
24 Front Wiper
25 Antilock Brake
System Valves
26 Upfitter SW 2
27 Upfitter SW 3
28 Parking Lamps,
Right
29 Parking
Lamps, Left
30 Upfitter 3
31 Upfitter SW 4
32 Upfitter 4