2015 GMC SIERRA DENALI ECU

Black plate (49,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Instruments and Controls 5-49Turn Display Off
Select to turn the display off. Press
anywhere on the display area or any
faceplate button to turn the
display on.
Rear Camera Select and the following may
display: .
Guidance Lines .
Rear Park Assist Symbols
Guidance Lines
Select to turn Off or On. See
Assistance Systems for Parking or
Backing on page 9-56 .
Rear Park Assist Symbols
Select to turn Off or On. See
Assistance Systems for Parking or
Backing on page 9-56 .
Return to Factory Settings
Select and the following may
display: .
Restore Vehicle Settings .
Clear All Private Data .
Restore Radio Settings
Restore Vehicle Settings
This allows selection of restoring
vehicle settings.
Select Restore or Cancel.
Clear All Private Data
This allows selection to clear all
private information from the vehicle.
Select Delete or Cancel.
Restore Radio Settings
This allows selection to restore
radio settings.
Select Restore or Cancel.
Software Information
Select to view the infotainment
system current software information. Universal Remote
System See Radio Frequency Statement on
page 13-12 .
Universal Remote System
Programming
If equipped, these buttons are in the
overhead console.
This system can replace up to three
remote control transmitters used to
activate devices such as garage
door openers, security systems, and
home automation devices. These
instructions refer to a garage door
opener, but can be used for other
devices.

Black plate (6,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
8-6 Climate Controls
3. Close the lower glove box door
and pull it from its frame to
remove the entire unit. 4. Release the two tabs holding the
service door. Open the service
door and remove the old filter.
5. Install the new air filter.
6. Close the service door and
secure the tabs.
7. Reverse the steps to reinstall the
glove box.
See your dealer if additional
assistance is needed. Service All vehicles have a label underhood
that identifies the refrigerant used in
the vehicle. The refrigerant system
should only be serviced by trained
and certified technicians. The air
conditioning evaporator should
never be repaired or replaced by
one from a salvage vehicle.
It should only be replaced by a new
evaporator to ensure proper and
safe operation.
During service, all refrigerants
should be reclaimed with proper
equipment. Venting refrigerants
directly to the atmosphere is harmful
to the environment and may also
create unsafe conditions based on
inhalation, combustion, frostbite,
or other health-based concerns.

Black plate (7,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Driving and Operating 9-7
{ CautionOperating the vehicle for
extended periods without the front
fascia lower air dam installed can
cause improper air flow to the
engine. Re-attach the front fascia
air dam after off-road driving.
Loading the Vehicle for
Off-Road Driving
{ Warning .
Unsecured cargo on the load
floor can be tossed about
when driving over rough
terrain. You or your
passengers can be struck by
flying objects. Secure the
cargo properly.
(Continued) Warning (Continued) .
Keep cargo in the cargo area
as far forward and as low as
possible. The heaviest things
should be on the floor,
forward of the rear axle. .
Heavy loads on the roof raise
the vehicle's center of gravity,
making it more likely to roll
over. You can be seriously or
fatally injured if the vehicle
rolls over. Put heavy loads
inside the cargo area, not on
the roof.
For more information about loading
the vehicle, see Vehicle Load Limits
on page 9-15 and Tires on
page 10-50 .
Environmental Concerns .
Always use established trails,
roads, and areas that have been
set aside for public off-road
recreational driving and obey all
posted regulations. .
Do not damage shrubs, flowers,
trees, or grasses or disturb
wildlife. .
Do not park over things that
burn. See Parking over Things
That Burn on page 9-32 .
Driving on Hills Driving safely on hills requires good
judgment and an understanding of
what the vehicle can and cannot do.
{ WarningMany hills are simply too steep
for any vehicle. Driving up hills
can cause the vehicle to stall.
Driving down hills can cause loss
of control. Driving across hills can
cause a rollover. You could be
injured or killed. Do not drive on
steep hills.
Before driving on a hill, assess the
steepness, traction, and
obstructions. If the terrain ahead

Black plate (18,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
9-18 Driving and Operating of the driver, passengers, and
cargo should never exceed the
vehicle's capacity weight. Certification/Tire Label
A vehicle-specific Certification/
Tire label is label is attached to
the center pillar (B-pillar). The
label shows the size of the
vehicle's original tires and the
inflation pressures needed to
obtain the gross weight capacity
of the vehicle. This is called
Gross Vehicle Weight Rating (GVWR). The GVWR
includes the weight of the
vehicle, all occupants, fuel, and
cargo.
The Certification/Tire label also
tells you the maximum weights
for the front and rear axles,
called Gross Axle Weight
Rating (GAWR). To find out the
actual loads on the front and
rear axles, you need to go to a
weigh station and weigh the
vehicle. Your dealer can help
you with this. Be sure to spread
out the load equally on both
sides of the centerline.
Never exceed the GVWR for the
vehicle, or the GAWR for either
the front or rear axle.
The Certification/Tire label also
contains important information
about the Front Axle Reserve
Capacity. See Adding a Snow
Plow or Similar Equipment on
page 9-88 . { Warning
In the case of a sudden stop
or collision, things carried in
the bed of your truck could
shift forward and come into
the passenger area, injuring
you and others. If you put
things in the bed of your truck,
you should make sure they
are properly secured.
{ Warning
Do not load the vehicle any
heavier than the Gross
Vehicle Weight Rating
(GVWR), or either the
maximum front or rear Gross
Axle Weight Rating (GAWR).
This can cause systems to
break and change the way the
vehicle handles. This could
(Continued)

Black plate (19,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Driving and Operating 9-19Warning (Continued)
cause loss of control and a
crash. Overloading can also
shorten the life of the vehicle.
{ CautionOverloading the vehicle may
cause damage. Repairs would not
be covered by the vehicle
warranty. Do not overload the
vehicle.
Using heavier suspension
components to get added
durability might not change the
weight ratings. Ask your dealer
to help load the vehicle the
right way.
If you put things inside the
vehicle — like suitcases, tools,
packages, or anything
else — they go as fast as the vehicle goes. If you have to stop
or turn quickly, or if there is a
crash, they will keep going.
{ Warning
Things you put inside the
vehicle can strike and injure
people in a sudden stop or
turn, or in a crash. .
Put things in the cargo
area of the vehicle. Try to
spread the weight evenly. .
Never stack heavier
things, like suitcases,
inside the vehicle so that
some of them are above
the tops of the seats. .
Do not leave an
unsecured child restraint
in the vehicle.
(Continued) Warning (Continued) .
When you carry something
inside the vehicle, secure
it whenever you can. .
Do not leave a seat folded
down unless you need to.
There is also important loading
information for off-road driving in
this manual. See “ Loading the
Vehicle for Off-Road Driving “
under Off-Road Driving on
page 9-6 .
Two-Tiered Loading
Depending on the model of the
pickup, an upper load platform
can be created by positioning
three or four 5 cm (2 in) by
15 cm (6 in) wooden planks
across the width of the pickup
box. The planks must be
inserted in the pickup box
depressions.

Black plate (20,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
9-20 Driving and Operating When using this upper load
platform, be sure the load is
securely tied down to prevent it
from shifting. The load's center
of gravity should be positioned
in a zone over the rear axle. The
zone is located in the area
between the front of each wheel
well and the rear of each wheel
well. The center of gravity height
must not extend above the top
of the pickup box flareboard.
Any load that extends beyond
the vehicle's taillamp area must
be properly marked according to
local laws and regulations.
Remember not to exceed the
Gross Axle Weight
Rating (GAWR) of the front or
rear axle.
Add-On Equipment
When carrying removable items,
a limit on how many people
carried inside the vehicle may be necessary. Be sure to weigh
the vehicle before buying and
installing the new equipment.
{ CautionOverloading the vehicle may
cause damage. Repairs would not
be covered by the vehicle
warranty. Do not overload the
vehicle.
Remember not to exceed the
Gross Axle Weight
Rating (GAWR) of the front or
rear axle.
* Equipment Maximum
Weight
Ladder Rack
and Cargo 340 kg (750 lb)
Cross Toolbox
and Cargo 181 kg (400 lb) * Equipment Maximum
Weight
Side Boxes
and Cargo 113 kg per
side (250 lb
per side)
* The combined weight for all
rail-mounted equipment should
not exceed 454 kg (1,000 lb). Loading Points
1. Primary Load Points
2. Secondary Load Areas

Black plate (22,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
9-22 Driving and Operating is concentrated and,
if suspended at that point, would
balance the front and rear.
Here is an example of proper
truck and camper match:
1.
Camper Center of Gravity2.
Recommended Center of
Gravity Location Zone
When the truck is used to carry
a slide-in camper, the total cargo
load of the truck consists of the
manufacturer's camper weight
figure, the weight of installed additional camper equipment not
included in the manufacturer's
camper weight figure, the weight
of camper cargo, and the weight
of passengers in the camper.
The total cargo load should not
exceed the truck's cargo weight
rating, and the camper's center
of gravity (1) should fall within
the truck's recommended center
of gravity zone (2) when
installed.
Any accessories or other
equipment that are added to the
vehicle must be weighed. Then,
subtract this extra weight from
the CWR. This extra weight may
shorten the center of gravity
zone of the vehicle.
If the slide-in camper and its
load weighs less than the CWR,
the center of gravity zone for the
vehicle may be larger. Secure loose items to prevent
weight shifts that could affect the
balance of the vehicle. When the
truck-camper is loaded, drive to
a scale and weigh on the front
and on the rear wheels
separately to determine axle
loads. Individual axle loads
should not exceed either of the
gross axle weight ratings
(GAWR). The total axle loads
should not exceed the vehicle's
gross vehicle weight rating
(GVWR). These ratings are
given on the Certification/Tire
label attached to the B-pillar.
See “ Certification/Tire Label ”
under Vehicle Load Limits on
page 9-15 . If weight ratings are
exceeded, move or remove
items to bring all weights below
the ratings.

Black plate (28,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
9-28 Driving and Operating
Engine Heater The engine heater can provide
easier starting and better fuel
economy during engine warm-up in
cold weather conditions at or below
− 18°C (0°F). Vehicles with an
engine heater should be plugged in
at least four hours before starting.
An internal thermostat in the
plug-end of the cord may exist,
which will prevent engine coolant
heater operation at temperatures
above − 18°C (0°F).
If the vehicle has a diesel engine,
see the Duramax diesel
supplement.
To Use the Engine Coolant
Heater
1. Turn off the engine. 2. Open the hood and unwrap the
electrical cord. The cord is
secured to the driver side fender
with a clip, next to the engine
compartment fuse block.
Carefully remove the wire tie
that bundles the electrical plug.
Do not cut the electrical cord.
Check the heater cord for
damage. If it is damaged, do not
use it. See your dealer for a
replacement. Inspect the cord for
damage yearly.
3. Plug the cord into a normal,
grounded 110-volt AC outlet.
{ Warning
Improper use of the heater cord
or an extension cord can damage
the cord and may result in
overheating and fire. .
Plug the cord into a
three-prong electrical utility
receptacle that is protected
(Continued) Warning (Continued) by a ground fault detection
function. An ungrounded
outlet could cause an electric
shock. .
Use a weatherproof,
heavy-duty, 15 amp-rated
extension cord if needed.
Failure to use the
recommended extension cord
in good operating condition,
or using a damaged heater or
extension cord, could make it
overheat and cause a fire,
property damage, electric
shock, and injury. .
Do not operate the vehicle
with the heater cord
permanently attached to the
(Continued)