2016 GMC SIERRA 1500 lock

GMC Sierra Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9234758) - 2016 - crc - 11/9/15
Driving and Operating 321
The fuel cap is behind a hinged fuel
door on the driver side of the
vehicle. Vehicles that have a
FlexFuel badge and a yellow fuel
cap can use either unleaded
gasoline or ethanol fuel containing
up to 85% ethanol (E85). SeeE85
or FlexFuel 0319.
To remove the fuel cap, turn it
slowly counterclockwise.
If the vehicle is a dual fuel tank
chassis cab model, and it runs out
of fuel, refuel the front fuel tank first
to ensure a quick restart.
{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.
. Potential fuel fires. Be careful not to spill fuel. Wait a
few seconds after you have finished
pumping before removing the
nozzle. Clean fuel from painted
surfaces as soon as possible. See
Exterior Care
0444.
When replacing the fuel cap, turn it
clockwise until it clicks. It will require
more effort to turn the fuel cap on
the last turn as you tighten it. Make
sure the cap is fully installed. The
diagnostic system can determine if
the fuel cap has been left off or
improperly installed. This would
allow fuel to evaporate into the
atmosphere. See Malfunction
Indicator Lamp (Check Engine
Light) 0141.
The TIGHTEN GAS CAP message
displays on the Driver Information
Center (DIC) if the fuel cap is not
properly installed. See Fuel System
Messages 0156 for more
information.
{Warning
If a fire starts while you are
refueling, do not remove the
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, be
sure to get the right type of cap
from your dealer. The wrong type
of fuel cap may not fit properly,
may cause the malfunction
indicator lamp to light, and could
damage the fuel tank and
emissions system. See
Malfunction Indicator Lamp
(Check Engine Light) 0141.

GMC Sierra Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9234758) - 2016 - crc - 11/9/15
344 Driving and Operating
selection of Tow/Haul when the
vehicle is unloaded. Such a
selection when unloaded may result
in unpleasant engine and
transmission driving characteristics
and reduced fuel economy. Tow/
Haul is recommended only when
pulling a heavy trailer or a large or
heavy load.
Integrated Trailer Brake
Control System
The vehicle may have an Integrated
Trailer Brake Control (ITBC) system
for use with electric trailer brakes or
most electric over hydraulic trailer
brakes.
This symbol is on the Trailer Brake
Control Panel on vehicles with an
ITBC system. The power output to
the trailer brakes is based on the
amount of brake pressure being
applied by the vehicle’s brakesystem, and on the type of trailer
brakes detected. This available
power output to the trailer brakes
can be adjusted to a wide range of
trailering situations.
The ITBC system is integrated with
the vehicle’
s brake, antilock brake,
and StabiliTrak systems. In trailering
conditions that cause the vehicle’s
antilock brake or StabiliTrak
systems to activate, power sent to
the trailer's brakes will be
automatically adjusted to minimize
trailer wheel lock-up. This does not
imply that the trailer has StabiliTrak.
If the vehicle’s brake, antilock brake,
or StabiliTrak systems are not
functioning properly, the ITBC
system may not be fully functional
or may not function at all. Make sure
all of these systems are fully
operational to ensure full
functionality of the ITBC system.
The ITBC system is powered
through the vehicle's electrical
system. Turning the ignition off will
also turn off the ITBC system. The
ITBC system is fully functional only
when the ignition is in ON/RUN.
{Warning
Connecting a trailer that has an
air brake system may result in
reduced or complete loss of trailer
braking. There may be an
increase in stopping distance or
trailer instability which could
result in personal injury or
damage to the vehicle, trailer,
or other property. Use the ITBC
system only with electric or
electric over hydraulic trailer
brakes.

GMC Sierra Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9234758) - 2016 - crc - 11/9/15
346 Driving and Operating
.There is a fault present in the
wiring to the trailer brakes (a
CHECK TRAILER WIRING
message will also display on
the DIC).
. The ITBC system is not working
due to a fault (a SERVICE
TRAILER BRAKE SYSTEM
message will also display in
the DIC).
Manual Trailer Brake Apply
The Manual Trailer Brake Apply
Lever is used to apply the trailer ’s
electric brakes independent of the
vehicle’s brakes. Sliding the lever to
the left will apply only the trailer
brakes. Use this lever to adjust
Trailer Gain to properly adjust the
power output to the trailer brakes.
The trailer's and the vehicle's brake
lamps will come on when either
vehicle brakes or manual trailer
brakes are applied. Trailer Gain Adjustment Procedure
Trailer Gain should be set for a
specific trailering condition and must
be adjusted anytime vehicle loading,
trailer loading, or road surface
conditions change.
{Warning
Trailer brakes that are
over-gained or under-gained may
not stop the vehicle and the trailer
as intended and can result in a
crash. Always follow the
instructions to set the Trailer Gain
for the proper trailer stopping
performance.
Use the following to adjust Trailer
Gain for each towing condition: 1. Drive the vehicle with the trailer attached on a level road
surface representative of the
towing condition and free of
traffic at about 32 to 40 km/h
(20 to 25 mph) and fully apply
the Manual Trailer Brake Apply
Lever. Adjusting Trailer Gain at
speeds lower than 32 to
40 km/h (20 to 25 mph) may
result in an incorrect gain
setting.
2. Adjust the Trailer Gain, using the Trailer Gain Adjustment
Buttons, to just below the point
of trailer wheel lock-up,
indicated by trailer wheel
squeal or tire smoke when a
trailer wheel locks.
Trailer wheel lock-up may not
occur if towing a heavily loaded
trailer. In this case, adjust the
Trailer Gain to the highest
allowable setting for the towing
condition.
3. Readjust Trailer Gain anytime vehicle loading, trailer loading,
or road surface conditions
change or if trailer wheel
lock-up is noticed at any time
while towing.

GMC Sierra Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9234758) - 2016 - crc - 11/9/15
354 Vehicle Care
Vehicle Care
General Information
General Information . . . . . . . . . . 355
California Proposition65 Warning . . . . . . . . . . . . . . . . . 355
California Perchlorate Materials Requirements . . . . . 356
Accessories and Modifications . . . . . . . . . . . . . . . . 356
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . 357
Hood . . . . . . . . . . . . . . . . . . . . . . . . . 357
Engine Compartment Overview . . . . . . . . . . . . . . . . . . . . 358
Engine Oil . . . . . . . . . . . . . . . . . . . . 363
Engine Oil Life System . . . . . . . 366
Automatic Transmission Fluid (6 Speed Transmission) . . . . . 367
Automatic Transmission Fluid (8 Speed Transmission) . . . . . 370
Engine Air Cleaner/Filter . . . . . . 370
Cooling System . . . . . . . . . . . . . . 371
Engine Coolant . . . . . . . . . . . . . . . 373
Engine Overheating . . . . . . . . . . 375
Overheated Engine Protection Operating Mode . . . . . . . . . . . . . 377
Engine Fan . . . . . . . . . . . . . . . . . . . 377 Power Steering Fluid (1500
Series) . . . . . . . . . . . . . . . . . . . . . . 378
Power Steering Fluid (2500/ 3500 Series) . . . . . . . . . . . . . . . . 378
Washer Fluid . . . . . . . . . . . . . . . . . 379
Brakes . . . . . . . . . . . . . . . . . . . . . . . 380
Brake Fluid . . . . . . . . . . . . . . . . . . . 380
Battery - North America . . . . . . 382
Four-Wheel Drive . . . . . . . . . . . . . 382
Front Axle . . . . . . . . . . . . . . . . . . . . 383
Rear Axle . . . . . . . . . . . . . . . . . . . . 384
Noise Control System . . . . . . . . 385
Starter Switch Check . . . . . . . . . 386
Automatic Transmission Shift
Lock Control Function
Check . . . . . . . . . . . . . . . . . . . . . . . 386
Ignition Transmission Lock Check . . . . . . . . . . . . . . . . . . . . . . . 387
Park Brake and P (Park) Mechanism Check . . . . . . . . . . 387
Wiper Blade Replacement . . . . 387
Glass Replacement . . . . . . . . . . 388
Headlamp Aiming
Headlamp Aiming . . . . . . . . . . . . 388
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . 388
Halogen Bulbs . . . . . . . . . . . . . . . . 388
High Intensity Discharge (HID) Lighting . . . . . . . . . . . . . . . . . . . . . 388 LED Lighting . . . . . . . . . . . . . . . . . 389
Taillamps, Turn Signal,
Stoplamps, and Back-Up
Lamps . . . . . . . . . . . . . . . . . . . . . . 389
Center High-Mounted
Stoplamp (CHMSL) and
Cargo Lamp . . . . . . . . . . . . . . . . . 390
Replacement Bulbs . . . . . . . . . . . 391
Electrical System
High Voltage Devices and Wiring . . . . . . . . . . . . . . . . . . . . . . . 391
Electrical System Overload . . . 391
Fuses . . . . . . . . . . . . . . . . . . . . . . . . 392
Engine Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . 392
Instrument Panel Fuse Block
(Right) . . . . . . . . . . . . . . . . . . . . . . 395
Instrument Panel Fuse Block (Left) . . . . . . . . . . . . . . . . . 397
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 399
All-Season Tires . . . . . . . . . . . . . . 400
Winter Tires . . . . . . . . . . . . . . . . . . 400
Low-Profile Tires . . . . . . . . . . . . . 401
All-Terrain Tires . . . . . . . . . . . . . . . 401
Tire Sidewall Labeling . . . . . . . . 401
Tire Designations . . . . . . . . . . . . . 404
Tire Terminology andDefinitions . . . . . . . . . . . . . . . . . . 405

GMC Sierra Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9234758) - 2016 - crc - 11/9/15
356 Vehicle Care
harm. Engine exhaust, many parts
and systems, many fluids, and
some component wear by-products
contain and/or emit these
chemicals.
SeeBattery - North America 0382
and Jump Starting - North
America 0434.
California Perchlorate
Materials Requirements
Certain types of automotive
applications, such as airbag
initiators, safety belt pretensioners,
and lithium batteries contained in
Remote Keyless Entry transmitters,
may contain perchlorate materials.
Special handling may be necessary.
For additional information, see
www.dtsc.ca.gov/hazardouswaste/
perchlorate.
Accessories and
Modifications
Adding non-dealer accessories or
making modifications to the vehicle
can affect vehicle performance and
safety, including such things as
airbags, braking, stability, ride and
handling, emissions systems,
aerodynamics, durability, and
electronic systems like antilock
brakes, traction control, and stability
control. These accessories or
modifications could even cause
malfunction or damage not covered
by the vehicle warranty.
Damage to suspension components
caused by modifying vehicle height
outside of factory settings will not be
covered by the warranty. Damage to vehicle components
resulting from modifications or the
installation or use of non-GM
certified parts, including control
module or software modifications, is
not covered under the terms of the
vehicle warranty and may affect
remaining warranty coverage for
affected parts.
GM Accessories are designed to
complement and function with other
systems on the vehicle. See your
dealer to accessorize the vehicle
using genuine GM Accessories
installed by a dealer technician.
Also, see
Adding Equipment to the
Airbag-Equipped Vehicle 085.

GMC Sierra Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9234758) - 2016 - crc - 11/9/15
Vehicle Care 359
1. Positive (+) Terminal. SeeJump Starting - North
America 0434.
2. Battery - North America 0382.
3. Coolant Surge Tank and Pressure Cap. See Cooling
System 0371.
4. Engine Air Cleaner/Filter 0370.
5. Automatic Transmission Dipstick (If Equipped). See
“How to Check Automatic
Transmission Fluid” under
Automatic Transmission Fluid
(6 Speed Transmission) 0367
or Automatic Transmission
Fluid (8 Speed
Transmission) 0370.
6. Remote Negative (–) Location. See Jump Starting - North
America 0434.
7. Engine Cooling Fans (Out of View). See Cooling
System 0371.
8. Engine Oil Fill Cap. See “When
to Add Engine Oil” under
Engine Oil 0363. 9. Engine Oil Dipstick. See
“Checking Engine Oil” under
Engine Oil 0363.
10. Brake Fluid Reservoir. See Brake Fluid 0380.
11. Windshield Washer Fluid Reservoir. See “Adding Washer
Fluid” under Washer
Fluid 0379.
12. Engine Compartment Fuse
Block 0392.

GMC Sierra Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9234758) - 2016 - crc - 11/9/15
Vehicle Care 361
1. Positive (+) Terminal. SeeJump Starting - North
America 0434.
2. Battery - North America 0382.
3. Coolant Surge Tank and Pressure Cap. See Cooling
System 0371.
4. Engine Air Cleaner/Filter 0370.
5. Automatic Transmission Dipstick (If Equipped). See
“How to Check Automatic
Transmission Fluid” under
Automatic Transmission Fluid
(6 Speed Transmission) 0367
or Automatic Transmission
Fluid (8 Speed
Transmission) 0370.
6. Remote Negative (–) Location (Out of View). See Jump
Starting - North America 0434.
7. Engine Cooling Fans (Out of View). See Cooling
System 0371.
8. Engine Oil Fill Cap. See “When
to Add Engine Oil” under
Engine Oil 0363. 9. Engine Oil Dipstick. See
“Checking Engine Oil” under
Engine Oil 0363.
10. Windshield Washer Fluid Reservoir. See “Adding Washer
Fluid” under Washer
Fluid 0379.
11. Brake Fluid Reservoir. See Brake Fluid 0380.
12. Engine Compartment Fuse
Block 0392.

GMC Sierra Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
9234758) - 2016 - crc - 11/9/15
Vehicle Care 363
1. Positive (+) Terminal. SeeJump Starting - North
America 0434.
2. Battery - North America 0382.
3. Coolant Surge Tank and Pressure Cap. See Cooling
System 0371.
4. Engine Air Cleaner/Filter 0370.
5. Automatic Transmission Dipstick (If Equipped). See
“How to Check Automatic
Transmission Fluid” under
Automatic Transmission Fluid
(6 Speed Transmission) 0367
or Automatic Transmission
Fluid (8 Speed
Transmission) 0370.
6. Engine Oil Dipstick. See “Checking Engine Oil” under
Engine Oil 0363.
7. Engine Oil Fill Cap. See “When
to Add Engine Oil” under
Engine Oil 0363.
8. Engine Cooling Fan (Out of View). See Cooling
System 0371. 9. Remote Negative (–) Location.
See Jump Starting - North
America 0434.
10. Power Steering Fluid Reservoir. See Power Steering
Fluid (1500 Series) 0378 or
Power Steering Fluid (2500/
3500 Series) 0378.
11. Windshield Washer Fluid Reservoir. See “Adding Washer
Fluid” under Washer
Fluid 0379.
12. Brake Fluid Reservoir. See Brake Fluid 0380.
13. Auxiliary Battery (If Equipped). SeeBattery - North
America 0382.
14. Engine Compartment Fuse
Block 0392.
If the vehicle has a diesel engine
and/or an Allison Transmission, see
the Duramax diesel supplement.
For an eAssist vehicle, see the
Silverado/Sierra supplement.Engine Oil
For diesel engine vehicles, see
“Engine Oil” in the Duramax diesel
supplement.
To ensure proper engine
performance and long life, careful
attention must be paid to engine oil.
Following these simple, but
important steps will help protect
your investment:
. Use engine oil approved to the
proper specification and of the
proper viscosity grade. See
“Selecting the Right Engine Oil”
in this section.
. Check the engine oil level
regularly and maintain the
proper oil level. See “Checking
Engine Oil” and“When to Add
Engine Oil” in this section.
. Change the engine oil at the
appropriate time. See Engine Oil
Life System 0366.
. Always dispose of engine oil
properly. See “What to Do with
Used Oil” in this section.