check engine GMC ACADIA 2011 User Guide

Black plate (34,1)GMC Acadia/Acadia Denali Owner Manual - 2011
5-34 Instruments and Controls
The following indicator lights come
on the instrument panel when
activated and also appear on
the HUD:
.Turn Signal Indicators
.High-Beam Indicator Symbol
The HUD temporarily displays
CHECK GAGES and ICE
POSSIBLE when these messages
are on the DIC trip computer.
The HUD also displays the following
messages on vehicles with these
systems, when they are active:
.TRACTION CONTROL ACTIVE
.STABILITRAK ACTIVE
Notice: If you try to use the
HUD image as a parking aid, you
may misjudge the distance and
damage your vehicle. Do not use
the HUD image as a parking aid.
When the HUD is on, the
speedometer reading is continually
displayed. The current radio station or CD track number will display
for a short period of time after
the radio or CD track status
changes. This happens whenever
radio information is changed.
The speedometer size is reduced
when radio, CD information,
warnings, or turn-by-turn navigation
information are displayed on
the HUD.
The HUD control is located to the
right of the steering wheel.
To adjust the HUD image so that
items are properly displayed, do the
following:
1. Adjust the driver's seat to a
comfortable position.
2. Start the engine.
3. Adjust the HUD controls.
Use the following settings to adjust
the HUD.
9 (Off): To turn HUD off, rotate the
dimming knob fully counterclockwise
until the HUD display turns off.
Brightness : Turn the knob
on the HUD control clockwise or
counterclockwise to brighten or
dim the display.
w (Up) : x(Down) : Press the up
or down arrows to center the HUD
image in your view. The HUD image
can only be adjusted up and down,
not side to side.

Black plate (39,1)GMC Acadia/Acadia Denali Owner Manual - 2011
Instruments and Controls 5-39
PASSENGER DOOR OPEN
This message displays and a chime
sounds if the passenger door is
not fully closed and the vehicle is
shifted out of P (Park). Stop and turn
off the vehicle, check the door for
obstructions, and close the door
again. Check to see if the message
still appears on the DIC.
POWER LIFTGATE OFF
This message displays when the
power liftgate has been turned off
by pressing the power liftgate button
on the center console.
RIGHT REAR DOOR OPEN
This message displays and a chime
sounds if the passenger side rear
door is not fully closed and the
vehicle is shifted out of P (Park).
Stop and turn off the vehicle, check
the door for obstructions, and close
the door again. Check to see if the
message still appears on the DIC.
Engine Cooling System
Messages
ENGINE HOT A/C
(Air Conditioning) OFF
This message displays when the
engine coolant becomes hotter than
the normal operating temperature.
SeeEngine Coolant Temperature
Gauge on page 5‑14. To avoid
added strain on a hot engine,
the air conditioning compressor
automatically turns off. When
the coolant temperature returns
to normal, the air conditioning
compressor turns back on.
You can continue to drive
your vehicle.
If this message continues to appear,
have the system repaired by your
dealer as soon as possible to avoid
damage to the engine.
ENGINE OVERHEATED IDLE
ENGINE
Notice: If you drive the vehicle
while the engine is overheating,
severe engine damage may
occur. If an overheat warning
appears on the instrument panel
cluster and/or DIC, stop the
vehicle as soon as possible.
Do not increase the engine
speed above normal idling speed.
See Engine Overheating on
page 10‑19 for more information.
This message displays when the
engine coolant temperature is too
hot. Stop and allow the vehicle to
idle until it cools down. See Engine
Coolant Temperature Gauge on
page 5‑14.
See Overheated Engine Protection
Operating Mode on page 10‑22 for
information on driving to a safe
place in an emergency.

Black plate (40,1)GMC Acadia/Acadia Denali Owner Manual - 2011
5-40 Instruments and Controls
ENGINE OVERHEATED STOP
ENGINE
Notice:If you drive the vehicle
while the engine is overheating,
severe engine damage may
occur. If an overheat warning
appears on the instrument panel
cluster and/or DIC, stop the
vehicle as soon as possible.
Do not increase the engine speed
above normal idling speed.
See Engine Overheating on
page 10‑19 for more information.
This message displays and a
continuous chime sounds if the
engine cooling system reaches
unsafe temperatures for operation.
Stop and turn off the vehicle as
soon as it is safe to do so to avoid
severe damage. This message
clears when the engine has cooled
to a safe operating temperature.
Engine Oil Messages
CHANGE ENGINE OIL SOON
This message displays when the
engine oil needs to be changed.
When you change the engine oil,
be sure to reset the CHANGE
ENGINE OIL SOON message.
See Engine Oil Life System on
page 10‑11 for information on how
to reset the message. See Engine
Oil on page 10‑8 andScheduled
Maintenance on page 11‑2 for
more information.
OIL PRESSURE LOW STOP
ENGINE
Notice: If you drive the vehicle
while the engine oil pressure
is low, severe engine damage
may occur. If a low oil pressure
warning appears on the
instrument panel cluster and/or
DIC, stop the vehicle as soon
as possible. Do not drive the
vehicle until the cause of the
low oil pressure is corrected.
See Engine Oil on page 10‑8
for more information.
This message displays if low oil
pressure levels occur. Stop the
vehicle as soon as safely possible
and do not operate it until the cause
of the low oil pressure has been
corrected. Check the oil as soon
as possible and have your vehicle
serviced by your dealer. See Engine
Oil on page 10‑8.

Black plate (41,1)GMC Acadia/Acadia Denali Owner Manual - 2011
Instruments and Controls 5-41
Engine Power Messages
ENGINE POWER IS REDUCED
This message displays and a
chime sounds when the cooling
system temperature gets too hot
and the engine further enters the
engine coolant protection mode.
SeeEngine Overheating on
page 10‑19 for further information.
This message also displays when
the vehicle's engine power is
reduced. Reduced engine power
can affect the vehicle's ability
to accelerate. If this message
is on, but there is no reduction
in performance, proceed to your
destination. The performance
may be reduced the next time
the vehicle is driven. The vehicle
may be driven at a reduced speed
while this message is on, but
acceleration and speed may be
reduced. Anytime this message
stays on, the vehicle should be
taken to your dealer for service
as soon as possible.
Fuel System Messages
FUEL LEVEL LOW
This message displays and a
chime sounds if the fuel level is
low. Refuel as soon as possible.
See Fuel Gauge on page 5‑13
and Fuel on page 9‑42 for more
information.
TIGHTEN GAS CAP
This message may display along
with the check engine light on
the instrument panel cluster if the
vehicle's fuel cap is not tightened
properly. See Malfunction Indicator
Lamp on page 5‑18. Reinstall the
fuel cap fully. See Filling the Tank
on page 9‑44. The diagnostic
system can determine if the fuel
cap has been left off or improperly
installed. A loose or missing fuel
cap allows fuel to evaporate into the
atmosphere. A few driving trips with
the cap properly installed should
turn this light and message off.
Key and Lock Messages
REPLACE BATTERY IN
REMOTE KEY
This message displays if a Remote
Keyless Entry (RKE) transmitter
battery is low. The battery needs
to be replaced in the transmitter.
See “Battery Replacement” under
Remote Keyless Entry (RKE)
System Operation on page 2‑3.
Lamp Messages
AUTOMATIC LIGHT
CONTROL OFF
This message displays when the
automatic headlamps are turned
off. This message clears itself after
10 seconds.
AUTOMATIC LIGHT
CONTROL ON
This message displays when the
automatic headlamps are turned
on. This message clears itself after
10 seconds.

Black plate (8,1)GMC Acadia/Acadia Denali Owner Manual - 2011
9-8 Driving and Operating
Highway Hypnosis
Always be alert and pay attention
to your surroundings while driving.
If you become tired or sleepy, find
a safe place to park the vehicle
and rest.
Other driving tips include:
.Keep the vehicle well ventilated.
.Keep interior temperature cool.
.Keep your eyes moving—scan
the road ahead and to the sides.
.Check the rearview mirror and
vehicle instruments often.
Hill and Mountain Roads
Driving on steep hills or through
mountains is different than driving
on flat or rolling terrain. Tips for
driving in these conditions include:
.Keep the vehicle serviced and in
good shape.
.Check all fluid levels and brakes,
tires, cooling system, and
transmission.
.Shift to a lower gear when going
down steep or long hills.
{WARNING
If you do not shift down, the
brakes could get so hot that they
would not work well. You would
then have poor braking or even
none going down a hill. You could
crash. Shift down to let the engine
assist the brakes on a steep
downhill slope.
{WARNING
Coasting downhill in N (Neutral)
or with the ignition off is
dangerous. The brakes will
have to do all the work of slowing
down and they could get so hot
(Continued)

Black plate (10,1)GMC Acadia/Acadia Denali Owner Manual - 2011
9-10 Driving and Operating
Blizzard Conditions
Being stuck in snow can be a
serious situation. Stay with the
vehicle unless there is help nearby.
If possible, use theRoadside
Assistance Program (U.S. and
Canada) on page 13‑8 orRoadside
Assistance Program (Mexico) on
page 13‑10. To get help and keep
everyone in the vehicle safe:
.Turn on the hazard warning
flashers.
.Tie a red cloth to an outside
mirror.
{WARNING
Snow can trap engine exhaust
under the vehicle. This may
cause exhaust gases to get
inside. Engine exhaust contains
Carbon Monoxide (CO) which
cannot be seen or smelled. It can
cause unconsciousness and even
death.
(Continued)
WARNING (Continued)
If the vehicle is stuck in the snow:
.Clear away snow from around
the base of your vehicle,
especially any that is blocking
the exhaust pipe.
.Check again from time to
time to be sure snow does
not collect there.
.Open a window about
5 cm (2 in) on the side of
the vehicle that is away from
the wind to bring in fresh air.
.Fully open the air outlets
on or under the instrument
panel.
.Adjust the climate control
system to a setting that
circulates the air inside
the vehicle and set the fan
speed to the highest setting.
See Climate Control System
in the Index.(Continued)
WARNING (Continued)
For more information about
carbon monoxide, see Engine
Exhaust on page 9‑24.
Snow can trap exhaust gases
under your vehicle. This can
cause deadly CO (Carbon
Monoxide) gas to get inside.
CO could overcome you and kill
you. You cannot see it or smell it,
so you might not know it is in your
vehicle. Clear away snow from
around the base of your vehicle,
especially any that is blocking the
exhaust.
Run the engine for short periods
only as needed to keep warm, but
be careful.

Black plate (20,1)GMC Acadia/Acadia Denali Owner Manual - 2011
9-20 Driving and Operating
To prevent gear damage, this
system also prevents cranking
if the engine is already running.
Engine cranking can be stopped
by turning the ignition switch
to the ACC/ACCESSORY or
LOCK/OFF position.
Notice: Cranking the engine for
long periods of time, by returning
the key to the START position
immediately after cranking has
ended, can overheat and damage
the cranking motor, and drain the
battery. Wait at least 15 seconds
between each try, to let the
cranking motor cool down.
2. If the engine does not start
after 5‐10 seconds, especially in
very cold weather (below 0°F or
−18°C), it could be flooded with
too much gasoline. Try pushing
the accelerator pedal all the
way to the floor and holding it
there as you hold the key in
START for up to a maximum
of 15 seconds. Wait at least 15 seconds between each try,
to allow the cranking motor to
cool down. When the engine
starts, let go of the key and
accelerator. If the vehicle starts
briefly but then stops again,
repeat these steps. This clears
the extra gasoline from the
engine. Do not race the engine
immediately after starting it.
Operate the engine and
transmission gently until the
oil warms up and lubricates
all moving parts.
Notice: The engine is designed
to work with the electronics in
the vehicle. If you add electrical
parts or accessories, you could
change the way the engine
operates. Before adding electrical
equipment, check with your
dealer. If you do not, the engine
might not perform properly. Any
resulting damage would not be
covered by the vehicle warranty.Engine Heater
The engine coolant heater
can provide easier starting
and better fuel economy during
engine warm-up in cold weather
conditions at or below 0°F (−18°C).
Vehicles with an engine coolant
heater should be plugged in at
least four hours before starting.
Some models may have an internal
thermostat in the cord which will
prevent engine coolant heater
operation at temperatures above
0°F (−18°C).
To Use the Engine Coolant
Heater
1. Turn off the engine.
2. Open the hood and unwrap the electrical cord. The cord is
located on the driver side of the
engine compartment. It is routed
around the windshield washer
fluid reservoir.
3. Plug the cord into a normal, grounded 110-volt AC outlet.

Black plate (29,1)GMC Acadia/Acadia Denali Owner Manual - 2011
Driving and Operating 9-29
Brakes
Antilock Brake
System (ABS)
This vehicle has the Antilock
Brake System (ABS), an advanced
electronic braking system that helps
prevent a braking skid.
When the engine is started and the
vehicle begins to drive away, ABS
checks itself. A momentary motor or
clicking noise might be heard while
this test is going on, and it might
even be noticed that the brake
pedal moves a little. This is normal.
If there is a problem with ABS, this
warning light stays on. SeeAntilock
Brake System (ABS) Warning Light
on page 5‑21. If driving safely on a wet road and
it becomes necessary to slam on
the brakes and continue braking
to avoid a sudden obstacle, a
computer senses that the wheels
are slowing down. If one of the
wheels is about to stop rolling,
the computer will separately work
the brakes at each wheel.
ABS can change the brake pressure
to each wheel, as required, faster
than any driver could. This can help
the driver steer around the obstacle
while braking hard.
As the brakes are applied, the
computer keeps receiving updates
on wheel speed and controls
braking pressure accordingly.
Remember: ABS does not
change the time needed to get
a foot up to the brake pedal or
always decrease stopping distance.
If you get too close to the vehicle
in front of you, there will not be
enough time to apply the brakes
if that vehicle suddenly slows or
stops. Always leave enough room
up ahead to stop, even with ABS.
Using ABS
Do not pump the brakes. Just hold
the brake pedal down firmly and let
ABS work. You might hear the ABS
pump or motor operating and feel
the brake pedal pulsate, but this is
normal.
Braking in Emergencies
ABS allows the driver to steer and
brake at the same time. In many
emergencies, steering can help
more than even the very best
braking.

Black plate (43,1)GMC Acadia/Acadia Denali Owner Manual - 2011
Driving and Operating 9-43
California Fuel
Requirements
If the vehicle is certified to meet
California Emissions Standards,
it is designed to operate on fuels
that meet California specifications.
See the underhood emission control
label. If this fuel is not available in
states adopting California Emissions
Standards, the vehicle will operate
satisfactorily on fuels meeting
federal specifications, but emission
control system performance might
be affected. The malfunction
indicator lamp could turn on and the
vehicle might fail a smog‐check test.
SeeMalfunction Indicator Lamp on
page 5‑18. If this occurs, return to
your authorized dealer for diagnosis.
If it is determined that the condition
is caused by the type of fuel used,
repairs might not be covered by the
vehicle warranty.
Fuels in Foreign
Countries
Never use leaded gasoline or any
other fuel not recommended in the
previous text on fuel. Costly repairs
caused by use of improper fuel
would not be covered by the vehicle
warranty.
To check the fuel availability, ask
an auto club, or contact a major oil
company that does business in the
country where you will be driving.
Fuel Additives
To provide cleaner air, all gasolines
in the United States are now
required to contain additives that
help prevent engine and fuel system
deposits from forming, allowing the
emission control system to work
properly. In most cases, nothing
should have to be added to the
fuel. However, some gasolines
contain only the minimum amount
of additive required to meet U.S. Environmental Protection Agency
regulations. To help keep fuel
injectors and intake valves clean
and avoid problems due to dirty
injectors or valves, look for gasoline
that is advertised as TOP TIER
Detergent Gasoline. Look for the
TOP TIER label on the fuel pump
to ensure gasoline meets enhanced
detergency standards developed
by the auto companies. A list of
marketers providing TOP TIER
Detergent Gasoline can be found
at www.toptiergas.com.
For customers who do not use
TOP TIER Detergent Gasoline
regularly, one bottle of GM Fuel
System Treatment PLUS, added
to the fuel tank at every engine oil
change, can help clean deposits
from fuel injectors and intake
valves. GM Fuel System Treatment
PLUS is the only gasoline additive
recommended by General Motors.
It is available at your dealer.

Black plate (48,1)GMC Acadia/Acadia Denali Owner Manual - 2011
9-48 Driving and Operating
Pulling a Trailer
Here are some important points:
.There are many laws, including
speed limit restrictions that apply
to trailering. Check for legal
requirements.
.Consider using sway control.
SeeTowing Equipment on
page 9‑54.
.Do not tow a trailer at all during
the first 800 km (500 miles)
the new vehicle is driven.
The engine, axle or other
parts could be damaged.
.During the first 800 km
(500 miles) that a trailer is
towed, do not drive over 80 km/h
(50 mph) and do not make starts
at full throttle. This reduces wear
on the vehicle.
.The vehicle can tow in
D (Drive). Use a lower gear if
the transmission shifts too often.
See “Tow/Haul Mode” later in
this section.
.Obey speed limit restrictions
when towing a trailer.
.The vehicle is designed
primarily as a passenger and
load carrying vehicle. If a trailer
is towed, the vehicle will require
more frequent maintenance due
to the additional load.
Driving with a Trailer
Towing a trailer requires experience.
Get familiar with handling and
braking with the added trailer
weight. The vehicle is now longer
and not as responsive as the
vehicle is by itself.
Check all trailer hitch parts
and attachments, safety chains,
electrical connectors, lamps, tires
and mirror adjustments. If the trailer
has electric brakes, start the vehicle
and trailer moving and then apply
the trailer brake controller by hand
to be sure the brakes are working.
During the trip, check regularly to be
sure that the load is secure, and the
lamps and trailer brakes are working
properly.