2020 GMC TERRAIN Trailer towing

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13556230) - 2020 - CRC - 9/4/19
116 Instruments and Controls
Caution (Continued)
costly repairs not covered by the
vehicle warranty. This could also
affect the vehicle’s ability to pass
an Emissions Inspection/
Maintenance test. See
Accessories and Modifications
0275.
Light Flashing (Gasoline
Engine Only)
If the light is flashing : A
malfunction has been detected that
could damage the emission control
system and increase vehicle
emissions. Diagnosis and service
may be required.
To help prevent damage, reduce
vehicle speed and avoid hard
accelerations and uphill grades.
If towing a trailer, reduce the
amount of cargo being hauled as
soon as possible.
If the light continues to flash, find a
safe place to park. Turn the vehicle
off and wait at least 10 seconds before restarting the engine. If the
light is still flashing, follow the
previous guidelines and see your
dealer for service as soon as
possible.
Light on Steady (All Engines)
If the light is on steady :
A
malfunction has been detected.
Diagnosis and service may be
required.
Check the following:
. If fuel has been added to the
vehicle using the capless funnel
adapter, make sure that it has
been removed. See “Filling the
Tank with a Portable Gas Can”
under Filling the Tank (Gasoline)
0 257 or
Filling the Tank (Diesel) 0258.
The diagnostic system can
detect if the adapter has been
left installed in the vehicle,
allowing fuel to evaporate into
the atmosphere. A few driving
trips with the adapter removed
may turn off the light. .
Poor fuel quality can cause
inefficient engine operation and
poor driveability, which may go
away once the engine is warmed
up. If this occurs, change the
fuel brand. It may require at
least one full tank of the proper
fuel to turn the light off. See
Recommended Fuel (LYX - 1.5L
L4 Turbo Engine) 0248 or
Recommended Fuel (LTG - 2.0L
L4 Turbo Engine) 0249 or
Fuel for Diesel Engines 0250.
If the light remains on, see your
dealer.
Emissions Inspection and
Maintenance Programs
If the vehicle requires an Emissions
Inspection/Maintenance test, the
test equipment will likely connect to
the vehicle's Data Link
Connector (DLC).

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13556230) - 2020 - CRC - 9/4/19
162 Driving and Operating
Lane Change Alert (LCA) . . . . . 243
Lane Keep Assist (LKA) . . . . . . 245
Fuel
Top Tier Fuel (Gasoline) . . . . . . 248
Top Tier Fuel (Diesel) . . . . . . . . . 248
Recommended Fuel (LYX -1.5L L4 Turbo Engine) . . . . . . 248
Recommended Fuel (LTG - 2.0L L4 Turbo Engine) . . . . . . 249
Prohibited Fuels (Gasoline) . . . 249
Fuels in Foreign Countries . . . 249
Fuel Additives (Gasoline) . . . . . 250
Fuel Additives (Diesel) . . . . . . . 250
Fuel for Diesel Engines . . . . . . . 250
Biodiesel . . . . . . . . . . . . . . . . . . . . . 251
Cold Weather Operation (Diesel) . . . . . . . . . . . . . . . . . . . . . 252
Water in Fuel (Diesel) . . . . . . . . 252
Running Out of Fuel (Diesel) . . . . . . . . . . . . . . . . . . . . . 256
Fuel Filter Replacement (Diesel) . . . . . . . . . . . . . . . . . . . . . 256
Filling the Tank (Gasoline) . . . . 257
Filling the Tank (Diesel) . . . . . . . 258
Filling a Portable Fuel Container (Gasoline) . . . . . . . . 260
Filling a Portable Fuel Container (Diesel) . . . . . . . . . . . 261
Trailer Towing
General TowingInformation . . . . . . . . . . . . . . . . . . 262
Driving Characteristics and Towing Tips . . . . . . . . . . . . . . . . . 262
Trailer Towing . . . . . . . . . . . . . . . . 266
Towing Equipment . . . . . . . . . . . . 269
Conversions and Add-Ons
Add-On Electrical
Equipment . . . . . . . . . . . . . . . . . . 271
Driving Information
Driver Behavior
Driving is an important
responsibility. Driver behavior, the
driving environment, and the
vehicle's design all affect how well a
vehicle performs.
Being aware of these factors can
help in understanding how the
vehicle handles and what can be
done to avoid many types of
crashes, including a rollover crash.
Most serious injuries and fatalities to
unbelted occupants can be reduced
or prevented by the use of seat
belts. In a rollover crash, an
unbelted person is significantly
more likely to die than a person
wearing a seat belt. In addition,
avoiding excessive speed, sudden
or abrupt turns, and drunken or
aggressive driving can help make
trips safer and avoid the possibility
of a crash.

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13556230) - 2020 - CRC - 9/4/19
176 Driving and Operating
tires (3) and the recommended
cold tire inflation pressures (4).
For more information on tires
and inflation seeTires0314
and
Tire Pressure 0321.
There is also important loading
information on the vehicle
Certification/Tire label. It may
show the Gross Vehicle Weight
Rating (GVWR) and the Gross
Axle Weight Rating (GAWR) for
the front and rear axle. See
“Certification/Tire Label” later in
this section.
“Steps for Determining Correct
Load Limit–
1.
Locate the statement "The
combined weight of
occupants and cargo should
never exceed XXX kg or
XXX lbs." on your vehicle’s
placard.
2.Determine the combined
weight of the driver and
passengers that will be
riding in your vehicle.
3.Subtract the combined
weight of the driver and
passengers from XXX kg or
XXX lbs.
4.The resulting figure equals
the available amount of
cargo and luggage load
capacity. For example, if the
"XXX" amount equals
1400 lbs. and there will be
five 150 lb passengers in
your vehicle, the amount of
available cargo and luggage
load capacity is 650 lbs.
(1400-750 (5 x 150) =
650 lbs.)
5.Determine the combined
weight of luggage and cargo
being loaded on the vehicle.
That weight may not safely
exceed the available cargo
and luggage load capacity
calculated in Step 4.
6.If your vehicle will be towing
a trailer, load from your
trailer will be transferred to
your vehicle. Consult this
manual to determine how
this reduces the available
cargo and luggage load
capacity of your vehicle.”
See Trailer Towing 0266 for
important information on towing
a trailer, towing safety rules and
trailering tips.

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13556230) - 2020 - CRC - 9/4/19
Driving and Operating 185
Winter Cover
If equipped, the winter cover can be
used to enhance heater
performance in extremely cold
conditions below−0 °C (32 °F). The
winter cover installs over the grille
and restricts airflow to the engine
compartment.
Usage Guidelines
The winter cover should only be
used while operating the vehicle in
extremely cold temperatures or in
heavy snow for extended periods. In
these temperatures, the vehicle
does not need a large amount of air
to properly cool the engine. When
more airflow is required to cool the
vehicle, the winter cover should not
be used. The following usage
guidelines will allow adequate
airflow for proper radiator and air
cooler performance:
. Do not use the winter cover if
towing a trailer. The vehicle may
overheat if the radiator is
covered while towing. .
Do not modify the cover. The
winter cover does not cover
some sections of the front of the
vehicle to provide enough
airflow.
. Keep the underside of the winter
cover as clean as possible.
Remove monthly or as
necessary and clean away dust
and debris.
. Do not use the winter cover
above −0 °C (32 °F).
Use only a mild soap to clean. Do
not use harsh soap, strong
detergents, or vinyl protectant/
sealant type products as they may
damage the special finish. Allow the
winter cover to dry completely
before reinstalling.
Installation Instructions
When first trying to fit the cover, it
may appear to be undersized but
will stretch during installation to
ensure a tight fit. The initial
installation of the cover is best
performed when the winter cover
is warm.
1. Center grille cover and make sure that it is positioned
correctly.

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13556230) - 2020 - CRC - 9/4/19
Driving and Operating 187
Warning (Continued)
.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
vehicle. Possible heater
cord and thermostat
damage could occur.
. While in use, do not let the
heater cord touch vehicle
parts or sharp edges. Never
close the hood on the
heater cord.
(Continued)
Warning (Continued)
.Before starting the vehicle,
unplug the cord, reattach
the cover to the plug, and
securely fasten the cord.
Keep the cord away from
any moving parts.
The length of time the heater should
remain plugged in depends on
several factors. Ask a dealer in the
area where you will be parking the
vehicle for the best advice on this.
Retained Accessory
Power (RAP)
When the ignition is turned from on
to off, the following features (if
equipped) will continue to function
for up to 10 minutes, or until the
driver door is opened. These
features will also work when the
ignition is in RUN or ACC/
ACCESSORY:
. Infotainment System .
Power Windows (during RAP
this functionality will be lost
when any door is opened)
. Sunroof (during RAP this
functionality will be lost when
any door is opened)
. Auxiliary Power Outlet
. Audio System
. OnStar System
Shifting Into Park
{Warning
It can be dangerous to get out of
the vehicle if the vehicle is not in
P (Park) with the parking brake
set. The vehicle can roll. If you
have left the engine running, the
vehicle can move suddenly. You
or others could be injured. To be
sure the vehicle will not move,
even when you are on fairly level
ground, use the steps that follow.
If you are pulling a trailer, see
Driving Characteristics and
Towing Tips 0262.

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13556230) - 2020 - CRC - 9/4/19
188 Driving and Operating
To shift into P (Park):1. Hold the brake pedal down and set the parking brake. See
Electric Parking Brake 0207.
2. Press P (Park).
3. Turn the ignition off.
Leaving the Vehicle with the
Engine Running
{Warning
It can be dangerous to leave the
vehicle with the engine running.
It could overheat and catch fire.
It is dangerous to get out of the
vehicle if the vehicle is not in
P (Park) with the parking brake
set. The vehicle can roll.
Do not leave the vehicle when the
engine is running. If you have left
the engine running, the vehicle
can move suddenly. You or others
could be injured. To be sure the
vehicle will not move, even when
you are on fairly level ground, (Continued)
Warning (Continued)
always set the parking brake and
shift the vehicle to P (Park). See
Shifting Into Park0187. If you
are towing a trailer, see Driving
Characteristics and Towing Tips
0 262.
If you have to leave the vehicle with
the engine running, the vehicle must
be in P (Park) with the parking
brake set.
Confirm that the vehicle is in
P (Park).
Torque Lock
Torque lock is when the weight of
the vehicle puts too much force on
the parking pawl in the
transmission. This happens when
parking on a hill and shifting the
transmission into P (Park) is not
done properly and then it is difficult
to shift out of P (Park). To prevent
torque lock, set the parking brake and then shift into P (Park). To find
out how, see
“Shifting Into Park”
listed previously.
On certain steep grades, the
transmission will automatically set
the parking brake to prevent
torque lock.
If torque lock does occur, the
vehicle may need to be pushed
uphill by another vehicle to relieve
the parking pawl pressure, so you
can shift out of P (Park).
Shifting out of Park
This vehicle is equipped with an
electronic transmission. If the
vehicle has an uncharged battery or
a battery with low voltage, try
charging or jump starting the
battery. See Jump Starting - North
America 0349.
To shift out of P (Park): 1. Ensure the engine is running.
2. Apply the brake pedal.
3. Press or pull the desired shift switch on the center stack.

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13556230) - 2020 - CRC - 9/4/19
192 Driving and Operating
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.
SeeShifting Into Park 0187 and
Engine Exhaust 0191.
If parking on a hill and pulling a
trailer, see Driving Characteristics
and Towing Tips 0262.
Diesel Particulate
Filter
The exhaust system has a Diesel
Particulate Filter (DPF) to reduce
vehicle emissions. On some
exhaust systems with a DPF, the
exhaust cooler mixes air with the
exhaust to lower the temperature
before it leaves the tailpipe.
The DPF, the tailpipe, and other
exhaust system components must
not be altered. Inspect regularly and
clean any mud or dirt from the
exhaust cooler, especially where the
exhaust cooler connects to the
tailpipe and the openings where
fresh air enters the cooler.
The DPF will clean itself as part of
normal operation. Several factors
including fuel consumed, hours of
engine operation, and miles driven
are monitored by the Engine Control
Module (ECM). The self-cleaning
occurs approximately once per tank
of fuel. Vehicles with the DPF have specific
fuel and engine oil requirements.
See
Fuel for Diesel Engines 0250
and
Engine Oil 0283.
Caution
Damage can occur to the DPF
components if the required Ultra
Low Sulfur Diesel (15 ppm sulfur
maximum) fuel and either CJ-4 or
CK-4 engine oil are not used.
This damage would not be
covered by the vehicle warranty.
Under certain conditions, such as
idling or very short trips, the
self-cleaning process has less
efficiency and cannot be completed.
To resolve this, continue driving
safely at a steady speed as close to
the posted speed limit as possible,
preferably without stopping, until the
message turns off. This can take up
to 30 minutes.

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-13556230) - 2020 - CRC - 9/4/19
Driving and Operating 205
Manual Mode
Electronic Range Select
(ERS) Mode
ERS or manual mode allows for the
selection of the range of gear
positions. Use this mode when
driving downhill or towing a trailer to
limit the top gear and vehicle speed.
The shift position indicator within the
Driver Information Center (DIC) will
display a number next to the L
indicating the highest available gear
under manual mode and the driving
conditions when manual mode was
selected.To use this feature:
1. With the vehicle in D (Drive), press the L (Low) button.
2. Press the plus or minus button on the center stack to increase
or decrease the gear range
available.
When shifting to L (Low), the
transmission will shift to a preset
lower gear range. For this preset
range, the highest gear available is
displayed next to the L in the DIC.
See Driver Information Center (DIC)
(Base and Midlevel) 0124 or
Driver Information Center (DIC)
(Uplevel) 0130. All gears below that
number are available to use. For
example, when 4 (Fourth) is shown
next to the L, 1 (First) through
4 (Fourth) gears are shifted
automatically. To shift to 5 (Fifth)
gear, press the + (Plus) button or
shift into D (Drive). L (Low) will prevent shifting to a
lower gear range if the engine
speed is too high. If vehicle speed is
not reduced within the time allowed,
the lower gear range shift will not be
completed. Slow the vehicle, then
press the
−(Minus) button to the
desired lower gear range.
While using ERS, cruise control can
be used.
Tow/Haul Mode
For information on the Tow/Haul
Mode, see Driver Mode Control
0 214.
Automatic Engine Grade
Braking
Automatic Engine Grade Braking
assists when driving downhill.
It maintains vehicle speed by
automatically implementing a shift
pattern that uses the engine and the
transmission to slow the vehicle.