2018 GMC TERRAIN Exhaust

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-10664916) - 2018 - crc - 9/15/17
168 Driving and Operating
Driving and
Operating
Driving Information
Driver Behavior . . . . . . . . . . . . . . . 169
Driving Environment . . . . . . . . . . 170
Vehicle Design . . . . . . . . . . . . . . . 170
Distracted Driving . . . . . . . . . . . . 170
Defensive Driving . . . . . . . . . . . . . 171
Drunk Driving . . . . . . . . . . . . . . . . . 171
Control of a Vehicle . . . . . . . . . . . 171
Braking . . . . . . . . . . . . . . . . . . . . . . . 171
Steering . . . . . . . . . . . . . . . . . . . . . . 172
Off-Road Recovery . . . . . . . . . . . 173
Loss of Control . . . . . . . . . . . . . . . 173
Off-Road Driving . . . . . . . . . . . . . 174
Driving on Wet Roads . . . . . . . . 178
Hill and Mountain Roads . . . . . 179
Winter Driving . . . . . . . . . . . . . . . . 179
If the Vehicle Is Stuck . . . . . . . . 180
Vehicle Load Limits . . . . . . . . . . . 181
Starting and Operating
New Vehicle Break-In . . . . . . . . . 185
Ignition Positions . . . . . . . . . . . . . 186
Starting the Engine . . . . . . . . . . . 188
Engine Heater . . . . . . . . . . . . . . . . 191Retained Accessory
Power (RAP) . . . . . . . . . . . . . . . . 192
Shifting Into Park . . . . . . . . . . . . . 192
Shifting out of Park . . . . . . . . . . . 193
Parking over Things That Burn . . . . . . . . . . . . . . . . . . . 196
Extended Parking . . . . . . . . . . . . 196
Engine Exhaust
Engine Exhaust . . . . . . . . . . . . . . 196
Running the Vehicle While Parked . . . . . . . . . . . . . . . . . . . . . . 197
Diesel Particulate Filter
Diesel Particulate Filter . . . . . . . 197
Diesel Exhaust Fluid
Diesel Exhaust Fluid . . . . . . . . . . 198
Automatic Transmission
Automatic Transmission . . . . . . 204
Manual Mode . . . . . . . . . . . . . . . . . 208
Tow/Haul Mode . . . . . . . . . . . . . . . 209
Drive Systems
All-Wheel Drive . . . . . . . . . . . . . . . 209
Brakes
Antilock BrakeSystem (ABS) . . . . . . . . . . . . . . . 210
Electric Parking Brake . . . . . . . . 210
Brake Assist . . . . . . . . . . . . . . . . . . 212 Hill Start Assist (HSA) . . . . . . . . 212
Ride Control Systems
Traction Control/Electronic
Stability Control . . . . . . . . . . . . . 213
Hill Descent Control (HDC) . . . 216
Driver Mode Control . . . . . . . . . . 216
Cruise Control
Cruise Control . . . . . . . . . . . . . . . . 220
Driver Assistance Systems
Driver Assistance Systems . . . 222
Assistance Systems for Parking or Backing . . . . . . . . . . 223
Assistance Systems for Driving . . . . . . . . . . . . . . . . . . . . . . 228
Forward Collision Alert (FCA) System . . . . . . . . . . . . . . . . . . . . . . 228
Forward Automatic Braking (FAB) . . . . . . . . . . . . . . . 231
Side Blind Zone Alert (SBZA) . . . . . . . . . . . . . . . . 232
Lane Change Alert (LCA) . . . . . 232
Lane Departure Warning (LDW) . . . . . . . . . . . . . 234
Lane Keep Assist (LKA) . . . . . . 234
Fuel
Fuel (Gasoline) . . . . . . . . . . . . . . . 236
California Fuel Requirements (Gasoline) . . . . . . . . . . . . . . . . . . . 237

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-10664916) - 2018 - crc - 9/15/17
Driving and Operating 177
.If an incline must be driven
across, and the vehicle starts to
slide, turn downhill. This should
help straighten out the vehicle
and prevent the side slipping.
{Warning
Getting out of the vehicle on the
downhill side when stopped
across an incline is dangerous.
If the vehicle rolls over, you could
be crushed or killed. Always get
out on the uphill side of the
vehicle and stay well clear of the
rollover path.
Driving in Mud, Sand, Snow,
or Ice
Use a low gear when driving in
mud —the deeper the mud, the
lower the gear. Keep the vehicle
moving to avoid getting stuck.
Traction changes when driving on
sand. On loose sand, such as on
beaches or sand dunes, the tires
tend to sink into the sand. This
affects steering, accelerating, and braking. Drive at a reduced speed
and avoid sharp turns or abrupt
maneuvers.
Traction is reduced on hard packed
snow and ice and it is easy to lose
control. Reduce vehicle speed when
driving on hard packed snow
and ice.
{Warning
Driving on frozen lakes, ponds,
or rivers can be dangerous. Ice
conditions vary greatly and the
vehicle could fall through the ice;
you and your passengers could
drown. Drive your vehicle on safe
surfaces only.
Driving in Water
{Warning
Driving through rushing water can
be dangerous. Deep water can
sweep your vehicle downstream
and you and your passengers
(Continued)
Warning (Continued)
could drown. If it is only shallow
water, it can still wash away the
ground from under your tires.
Traction could be lost, and the
vehicle could roll over. Do not
drive through rushing water.
Caution
Do not drive through standing
water if it is deep enough to cover
the wheel hubs, axles, or exhaust
pipe. Deep water can damage the
axle and other vehicle parts.
If the standing water is not too deep,
drive through it slowly. At faster
speeds, water can get into the
engine and cause it to stall. Stalling
can occur if the exhaust pipe is
under water. Do not turn off the
ignition when driving through water.
If the exhaust pipe is under water,
the engine will not start. When going

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-10664916) - 2018 - crc - 9/15/17
178 Driving and Operating
through water, the brakes get wet
and it may take longer to stop. See
Driving on Wet Roads0178.
After Off-Road Driving
Remove any brush or debris that
has collected on the underbody or
chassis, or under the hood. These
accumulations can be a fire hazard.
After operation in mud or sand,
have the brake linings cleaned and
checked. These substances can
cause glazing and uneven braking.
Check the body structure, steering,
suspension, wheels, tires, and
exhaust system for damage and
check the fuel lines and cooling
system for any leakage.
More frequent maintenance service
is required. See the Maintenance
Schedule 0353.
Driving on Wet Roads
Rain and wet roads can reduce
vehicle traction and affect your
ability to stop and accelerate.
Always drive slower in these types of driving conditions and avoid
driving through large puddles and
deep-standing or flowing water.
{Warning
Wet brakes can cause crashes.
They might not work as well in a
quick stop and could cause
pulling to one side. You could
lose control of the vehicle.
After driving through a large
puddle of water or a car/vehicle
wash, lightly apply the brake
pedal until the brakes work
normally.
Flowing or rushing water creates
strong forces. Driving through
flowing water could cause the
vehicle to be carried away. If this
happens, you and other vehicle
occupants could drown. Do not
ignore police warnings and be
very cautious about trying to drive
through flowing water.
Hydroplaning
Hydroplaning is dangerous. Water
can build up under the vehicle's
tires so they actually ride on the
water. This can happen if the road is
wet enough and you are going fast
enough. When the vehicle is
hydroplaning, it has little or no
contact with the road.
There is no hard and fast rule about
hydroplaning. The best advice is to
slow down when the road is wet.
Other Rainy Weather Tips
Besides slowing down, other wet
weather driving tips include:
.
Allow extra following distance.
. Pass with caution.
. Keep windshield wiping
equipment in good shape.
. Keep the windshield washer fluid
reservoir filled.
. Have good tires with proper
tread depth. See Tires0300.
. Turn off cruise control.

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-10664916) - 2018 - crc - 9/15/17
180 Driving and Operating
.Allow greater following distance
and watch for slippery spots. Icy
patches can occur on otherwise
clear roads in shaded areas.
The surface of a curve or an
overpass can remain icy when
the surrounding roads are clear.
Avoid sudden steering
maneuvers and braking while
on ice.
. Turn off cruise control.
Blizzard Conditions
Stop the vehicle in a safe place and
signal for help. Stay with the vehicle
unless there is help nearby.
If possible, use Roadside
Assistance. See Roadside
Assistance Program 0373. 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.
If the vehicle is stuck in snow:
. Clear snow from the base of
the vehicle, especially any
blocking the exhaust pipe.
. Open a window about 5 cm
(2 in) on the vehicle side
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 circulate the air
inside the vehicle and set
(Continued)
Warning (Continued)
the fan speed to the highest
setting. See“Climate
Control Systems.”
For more information about CO,
see Engine Exhaust 0196.
To save fuel, run the engine for
short periods to warm the vehicle
and then shut the engine off and
partially close the window. Moving
about to keep warm also helps.
If it takes time for help to arrive,
when running the engine, push the
accelerator pedal slightly so the
engine runs faster than the idle
speed. This keeps the battery
charged to restart the vehicle and to
signal for help with the headlamps.
Do this as little as possible, to
save fuel.
If the Vehicle Is Stuck
Slowly and cautiously spin the
wheels to free the vehicle when
stuck in sand, mud, ice, or snow.

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-10664916) - 2018 - crc - 9/15/17
196 Driving and Operating
Parking over Things
That Burn
{Warning
Things that can burn could touch
hot exhaust parts under the
vehicle and ignite. Do not park
over papers, leaves, dry grass,
or other things that can burn.
Extended Parking
It is best not to park with the vehicle
running. If the vehicle is left running,
be sure it will not move and there is
adequate ventilation.
SeeShifting Into Park 0192 and
Engine Exhaust 0196. If the vehicle is left parked and
running with the RKE transmitter
outside the vehicle, it will turn off
after one hour.
If the vehicle is left parked and
running with the RKE transmitter
inside the vehicle, it will turn off after
two hours.
The vehicle could turn off sooner if it
is parked on a hill, due to lack of
available fuel.
The timer will reset if the vehicle is
taken out of P (Park) while it is
running.
Engine Exhaust
{Warning
Engine exhaust contains carbon
monoxide (CO), which cannot be
seen or smelled. Exposure to CO
can cause unconsciousness and
even death.
Exhaust may enter the vehicle if:
. The vehicle idles in areas
with poor ventilation
(parking garages, tunnels,
deep snow that may block
underbody airflow or tail
pipes).
. The exhaust smells or
sounds strange or different.
. The exhaust system leaks
due to corrosion or damage.
. The vehicle exhaust system
has been modified,
damaged, or improperly
repaired.
(Continued)

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-10664916) - 2018 - crc - 9/15/17
Driving and Operating 197
Warning (Continued)
.There are holes or openings
in the vehicle body from
damage or aftermarket
modifications that are not
completely sealed.
If unusual fumes are detected or
if it is suspected that exhaust is
coming into the vehicle: . Drive it only with the
windows completely down.
. Have the vehicle repaired
immediately.
Never park the vehicle with the
engine running in an enclosed
area such as a garage or a
building that has no fresh air
ventilation.
Running the Vehicle
While Parked
It is better not to park with the
engine running.
If the vehicle is left with the engine
running, follow the proper steps to
be sure the vehicle will not move.
See Shifting Into Park 0192 and
Engine Exhaust 0196.
If parking on a hill and pulling a
trailer, see Driving Characteristics
and Towing Tips 0251.
Diesel Particulate
Filter
The Diesel Particulate Filter (DPF)
system filters soot particles out of
the exhaust gases. The DPF is
under the vehicle in the exhaust
system.
Depending on a number of factors
monitored by the engine computer,
the DPF will need to be cleaned of
accumulated solids. When a
cleaning is needed, the engine
computer will initiate a self-cleaning
function that runs automatically
during driving without any
notification. The filter is cleaned by
periodically burning off the soot
particles at high temperature. This
process takes place automatically
under set driving conditions and
may take up to 25 minutes. Fuel
consumption may be higher during
this period.
While the DPF cleaning is
automatically controlled by the
engine computer, the vehicle will
need to operate continuously for
approximately 25 minutes and at

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-10664916) - 2018 - crc - 9/15/17
198 Driving and Operating
speeds greater than 50 km/h
(30 mph) to clean the DPF
effectively.
If the vehicle is used for numerous
short trips or extended slow-speed
operation, the engine computer may
not be able to adequately heat up
the exhaust system to clean the
DPF effectively. The engine
computer has been designed to
continuously monitor the condition
of the DPF. When the engine
computer detects that the DPF is
nearly full of particulates and that
the vehicle is not being operated in
a manner that would allow effective
automatic DPF cleaning, a Driver
Information Center (DIC) message
will display. Start the cleaning
process as soon as possible.
Cleaning Process
To activate the cleaning process,
continue driving safely, and keep
vehicle speed above 50 km/h (30
mph) until the warning message in
the DIC turns off.If the vehicle continues to be driven
with the DPF warning message on,
and the exhaust filter is not cleaned
as required, the malfunction
indicator lamp and the ENGINE
POWER IS REDUCED message
will come on. Dealer service is
necessary.
See
Malfunction Indicator Lamp
(Check Engine Light) 0127.
{Warning
During DPF self cleaning or
during extended idling while
parked, the exhaust system and
exhaust gases are very hot.
Things that burn could touch hot
exhaust parts under the vehicle
and ignite. You or others could be
burned. Do not park, or idle for an
extended period of time, near or
over papers, leaves, dry grass,
or other things that can burn.
Keep the exhaust area clear of
material that could ignite or burn.
See Parking over Things That
Burn 0196 for more information.
Diesel Exhaust Fluid
{Warning
Diesel Exhaust Fluid (DEF) is
corrosive. Do not allow it to come
in contact with your skin, eyes,
or the finished surfaces of the
vehicle. If exposed, it may cause
skin and eye irritation. Wear skin
and eye protection when
handling. Inhalation may cause
irritation to the upper respiratory
tract. Store in a cool,
well-ventilated area. For more
safety and storage information,
see the label of the Diesel
Exhaust Fluid container.
DEF is used with diesel engines to
reduce the amount of regulated
emissions produced. The fluid level
in the DEF tank must be maintained
for the vehicle to run correctly. The
capacity of the DEF tank is 18.5 L
(4.9 gal).

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-10664916) - 2018 - crc - 9/15/17
Driving and Operating 199
It is normal to hear the DEF system
purge fluid back into the tank after
the vehicle is shut off.
Locating Diesel Exhaust Fluid
DEF can be purchased at a GMC
dealer. It can also be purchased at
authorized vehicle dealerships.
Additionally, some diesel fueling
stations or retailers may have DEF
for purchase. For vehicles with an
active OnStar service plan, OnStar
can help locate a DEF retailer. See
Customer Assistance Offices0371
for phone numbers to assist in
contacting a GM dealer. See
Recommended Fluids and
Lubricants 0361. Filling the DEF Tank
Caution
Use only DEF that is GM
approved, or fluid containing the
API certified or ISO 22241 label.
The use of other fluids could
damage the system, requiring
costly repairs that will not be
covered by the vehicle warranty.
When adding DEF to an empty or
very low tank, always add at least
7.6 L (2 gal) of fluid to release the
vehicle from speed limitation. To prevent damage to the system,
do not overfill the DEF tank. When
fluid reaches the top of the fill pipe,
stop filling. Do not top off the
DEF tank.
If you spill DEF during filling, wipe
any affected surface with a damp
cloth.
For information on how to fill the
DEF tank, see
Filling the Tank
(Gasoline) 0247 orFilling the Tank
(Diesel) 0248.
Exhaust Fluid Low
A full DEF tank will last for several
thousand kilometers (miles),
depending on vehicle usage. As the
exhaust fluid level drops, warnings
will automatically be displayed in the
Driver Information Center (DIC).
Exhaust fluid level status is
available on the DIC under the
Vehicle Information menu. See
“Diesel Exhaust Fluid (DEF)” in
Driver Information Center (DIC)
0 136.
To avoid vehicle speed limitations,
the DEF tank should be refilled at
the first opportunity after a low