2021 GMC CANYON Owner's Manual

GMC Canyon/Canyon Denali Owner Manual (GMNA-Localizing-U.S./Canada-
14430430) - 2021 - CRC - 9/9/20
192 Driving and Operating
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.
.There are holes or openings in the
vehicle body from damage or
aftermarket modifications that are not
completely sealed. (Continued)
Warning (Continued)
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
0 190 and
Engine Exhaust 0192.
If parking on a hill and pulling a trailer, see
Driving Characteristics and Towing Tips
0 217.
Automatic Transmission
If equipped, there is an electronic shift lever
position indicator within the instrument
cluster. This display comes on when the
ignition key is in ACC/ACCESSORY or
ON/RUN.
P : This position locks the drive wheels. Use
P (Park) when starting the engine because
the vehicle cannot move easily. When
parked on a hill, especially when the vehicle
has a heavy load, you might notice an
increase in the effort to shift out of P (Park).
See “Torque Lock” underShifting Into Park
0 190.

GMC Canyon/Canyon Denali Owner Manual (GMNA-Localizing-U.S./Canada-
14430430) - 2021 - CRC - 9/9/20
Driving and Operating 193
{Warning
It is dangerous to get out of the vehicle
if the shift lever is not fully in P (Park)
with the parking brake firmly 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,
always set the parking brake and move
the shift lever to P (Park). SeeShifting
Into Park 0190 and
Driving Characteristics and Towing Tips
0 217.
{Warning
If you have four-wheel drive, the vehicle
will be free to roll —even if the shift
lever is in P (Park) —if the transfer case
is in N (Neutral). So, be sure the transfer
case is in a drive gear, Two-Wheel Drive (Continued)
Warning (Continued)
High or Four-Wheel Drive High or
Four-Wheel Drive Low—not in
N (Neutral). See Shifting Into Park 0190.
R : Use this gear to back up.
Caution
Shifting to R (Reverse) while the vehicle is
moving forward could damage the
transmission. The repairs would not be
covered by the vehicle warranty. Shift to
R (Reverse) only after the vehicle is
stopped.
To rock the vehicle back and forth to get
out of snow, ice, or sand without damaging
the transmission, see If the Vehicle Is Stuck
0 179.
N : In this position, the engine does not
connect with the wheels. To restart the
engine when the vehicle is already moving,
use N (Neutral) only.
{Warning
Shifting into a drive gear while the
engine is running at high speed is
dangerous. Unless your foot is firmly on
the brake pedal, the vehicle could move
very rapidly. You could lose control and
hit people or objects. Do not shift into a
drive gear while the engine is running at
high speed.
Caution
Shifting out of P (Park) or N (Neutral) with
the engine running at high speed may
damage the transmission. The repairs
would not be covered by the vehicle
warranty. Be sure the engine is not
running at high speed when shifting the
vehicle.
Caution
A transmission hot message may display
if the automatic transmission fluid is too
hot. Driving under this condition can
damage the vehicle. Stop and idle the
engine to cool the automatic
(Continued)

GMC Canyon/Canyon Denali Owner Manual (GMNA-Localizing-U.S./Canada-
14430430) - 2021 - CRC - 9/9/20
194 Driving and Operating
Caution (Continued)
transmission fluid. This message clears
when the transmission fluid has cooled
sufficiently.
D : This position is for normal driving.
If more power is needed for passing, press
the accelerator pedal down.
D (Drive) can be used when towing a trailer,
carrying a heavy load, driving on steep hills,
or driving off-road. Shift the transmission to
a lower gear range selection if the
transmission shifts too often. See Manual
Mode 0195.
Downshifting the transmission in slippery
road conditions could result in skidding. See
“Skidding” underLoss of Control 0173.
The vehicle has a shift stabilization feature
that adjusts the transmission shifting to the
current driving conditions in order to reduce
rapid upshifts and downshifts. This shift
stabilization feature is designed to
determine, before making an upshift, if the
engine is able to maintain vehicle speed by
analyzing things such as vehicle speed,
throttle position, and vehicle load. If the
shift stabilization feature determines that a
current vehicle speed cannot be maintained, the transmission does not upshift and
instead holds the current gear. In some
cases, this could appear to be a delayed
shift, however the transmission is operating
normally.
The transmission uses adaptive shift
controls. The adaptive shift control process
continually compares key shift parameters
to pre-programmed ideal shifts stored in the
transmission’s computer. The transmission
constantly makes adjustments to improve
vehicle performance according to how the
vehicle is being used, such as with a heavy
load or when the temperature changes.
During this adaptive shift control process,
shifting might feel different as the
transmission determines the best settings.
When temperatures are very cold, the
transmission's gear shifting could be delayed
providing more stable shifts until the engine
warms up. Shifts could be more noticeable
with a cold transmission. This difference in
shifting is normal.
L :
This position allows selection of a range
of gears appropriate for current driving
conditions. See Manual Mode0195.
Caution
Spinning the tires or holding the vehicle
in one place on a hill using only the
accelerator pedal may damage the
transmission. The repair will not be
covered by the vehicle warranty. If the
vehicle is stuck, do not spin the tires.
When stopping on a hill, use the brakes
to hold the vehicle in place.
Normal Mode Grade Braking
Normal Mode Grade Braking is enabled
when the vehicle is started, but is not
enabled in Range Selection Mode. It assists
in maintaining desired vehicle speeds when
driving on downhill grades by using the
engine and transmission to slow the vehicle.

GMC Canyon/Canyon Denali Owner Manual (GMNA-Localizing-U.S./Canada-
14430430) - 2021 - CRC - 9/9/20
Driving and Operating 195
Manual Mode
Range Selection Mode
Range Selection Mode helps control the
vehicle's transmission and vehicle speed
while driving downhill or towing a trailer by
letting you select a desired range of gears.To use this feature:
1. Move the shift lever to L (Manual Mode).
2. Press the plus/minus button on the shift lever to select the desired range of gears
for current driving conditions.
When the shift lever is moved from
D (Drive) to L (Manual Mode), a number
displays next to the L, indicating the current
transmission range.
This number is the highest gear that the
transmission will command while operating
in L (Manual Mode). All gears below that
number are available. As driving conditions
change, the transmission can automatically
shift to lower gears. For example, when L5 is
selected, 1 (First) through 5 (Fifth) gears are
automatically shifted by the transmission,
but 6 (Sixth) cannot be used until the plus/
minus button on the shift lever is used to
change to the range. When the shift lever is moved from
D (Drive) to L (Manual Mode), a downshift
may occur. The gear that the transmission is
operating in when the shift lever is moved
from D (Drive) to L (Manual Mode)
determines if a downshift occurs. See the
following chart.

GMC Canyon/Canyon Denali Owner Manual (GMNA-Localizing-U.S./Canada-
14430430) - 2021 - CRC - 9/9/20
196 Driving and Operating
6-Speed Automatic TransmissionGear before shifting from D (Drive) to
L (Manual Mode) 6th 5th 4th 3rd 2nd 1st
Range after shifting from D (Drive) to
L (Manual Mode) L4 L4 L3 L2 L2 L1
8-Speed Automatic Transmission Gear before shifting
from D (Drive) to
L (Manual Mode) 8th 7th 6th 5th 4th 3rd 2nd 1st
Range after shifting
from D (Drive) to
L (Manual Mode) –
Tow/Haul not engaged L6 L6 L5 L4 L3 L3 L2 L1
Range after shifting
from D (Drive) to
L (Manual Mode) –
Tow/Haul engaged L6 L5 L4 L3 L3 L3 L2 L1
Grade Braking is not available when Range
Selection Mode is active. See Tow/Haul
Mode 0196. While using Range Selection Mode, cruise
control and the Tow/Haul Mode can
be used.Caution
Spinning the tires or holding the vehicle
in one place on a hill using only the
accelerator pedal may damage the
transmission. The repair will not be
covered by the vehicle warranty. If the
vehicle is stuck, do not spin the tires.
When stopping on a hill, use the brakes
to hold the vehicle in place.
Low Traction Mode
If equipped, Low Traction Mode assists in
vehicle acceleration when road conditions
are slippery, such as with ice or snow. While
the vehicle is at a stop, select L2 using
Range Selection Mode. This will limit torque
to the wheels and help to prevent the tires
from spinning.
Tow/Haul Mode
If equipped, Tow/Haul Mode adjusts the
transmission shift pattern to reduce shift
cycling. While towing heavy loads, this
mode provides increased performance and
vehicle control.

GMC Canyon/Canyon Denali Owner Manual (GMNA-Localizing-U.S./Canada-
14430430) - 2021 - CRC - 9/9/20
Driving and Operating 197
Turn the Tow/Haul Mode on and off by
pressing the button on the center stack.
When the Tow/Haul Mode is enabled, a
light on the instrument cluster will come on.
SeeTow/Haul Mode Light 090 and
Hill and Mountain Roads 0178.
Also see “Tow/Haul Mode” underTowing
Equipment 0224.
If the vehicle has a diesel engine, the Tow/
Haul button activates the exhaust brake
system simultaneously. See “Exhaust Brake”
in the Duramax diesel supplement.
Drive Systems
Four-Wheel Drive
If equipped, four-wheel drive engages the
front axle for extra traction.
Caution
Do not drive on clean, dry pavement in 4
m, or 4nfor an extended period of time.
These conditions may cause:
.Overheating.
.Oil leakage.
.Damage to internal and external
components of the front axle.
.Premature wear on the vehicle’s
powertrain.
Driving on clean, dry pavement in 4
mor 4
nmay:
.Cause a vibration to be felt in the
steering system.
.Cause tires to wear faster.
.Cause additional driveline noise.
{Warning
If equipped with four-wheel drive, the
vehicle will be free to roll if the transfer
case is in N (Neutral), even when the shift
lever is in P (Park). You or someone else
could be seriously injured. Be sure the
transfer case is in a drive gear —2
m, 4m,
(Continued)
Warning (Continued)
or 4n— or set the parking brake before
placing the transfer case in N (Neutral).
See Shifting Into Park 0190.
Caution
Extended high-speed operation in 4n
may damage or shorten the life of the
drivetrain.
Engagement noise and bump when shifting
between 4
nand 4mor from N (Neutral),
with the engine running, is normal.
Shifting into 4
nwill turn Traction Control
and StabiliTrak/Electronic Stability Control
(ESC) off. See Traction Control/Electronic
Stability Control 0204.

GMC Canyon/Canyon Denali Owner Manual (GMNA-Localizing-U.S./Canada-
14430430) - 2021 - CRC - 9/9/20
198 Driving and Operating
Electronic Transfer Case
Use the transfer case knob, next to the
steering wheel, to shift into and out of
four-wheel drive for extra traction.
All of the lights will flash on then off
momentarily when the ignition is turned on.
The light that remains on will indicate the
state of the transfer case.
If the indicator mark on the knob does not
match up with the light then that likely
means the knob was moved when the
ignition was off.
The indicator mark on the knob must line
up with the indicator light before a shift can
be commanded. To command a shift rotate
the transfer case knob to the new desiredposition. The light will flash meaning that
the shift is in progress. When the shift is
completed the new position will be
illuminated. If the transfer case cannot
complete a shift command, it will go back to
its last chosen setting.
In extreme cold weather, it may be
necessary to slow or stop the vehicle to
shift from 2
mto 4m.
Delayed shift from 4
mto 2mmay be
experienced due to uneven tire wear, low
tire pressure, high vehicle loading, or cold
temperatures.
Caution
Shifting the transmission into gear before
the requested mode indicator light has
stopped flashing could damage the
transfer case.
The settings are:
N (Neutral) : Use only when the vehicle
needs to be towed. See Recreational Vehicle
Towing 0297 or
Towing the Vehicle 0296. 2
m(Two-Wheel Drive High) :
Use for driving
on most streets and highways. The front
axle is not engaged. This setting provides
the best fuel economy.
4
n(Four-Wheel Drive Low) : This setting
engages the front axle and delivers extra
torque. Choose 4
nif driving off-road in deep
sand, deep mud, or deep snow, and while
climbing or descending steep hills. When
engaged, keep vehicle speed below 72 km/h
(45 mph).
Shifting into 4
nwill turn Traction Control
and StabiliTrak/ESC off. See Traction Control/
Electronic Stability Control 0204.
4
m(Four-Wheel Drive High) : Use when
extra traction is needed. The front axle
engages and helps when driving on snowy
or icy roads, and when off-roading. The
vehicle can be shifted from 2
mto 4mwhile
the vehicle is moving.
Shifting Into 4
m
Turn the knob to 4mat any speed up to
121 km/h (75 mph), except from 4
n. The
indicator light will flash while shifting and
will remain on the selected setting.

GMC Canyon/Canyon Denali Owner Manual (GMNA-Localizing-U.S./Canada-
14430430) - 2021 - CRC - 9/9/20
Driving and Operating 199
Shifting Into 2m
Turn the knob to 2mat any speed, except
when shifting from 4
n.
Shifting Into 4
n
When 4nis engaged, vehicle speed should
be kept below 72 km/h (45 mph).
1. The ignition must be on and the vehicle must be stopped or moving less than
5 km/h (3 mph) with the transmission in
N (Neutral). It is best for the vehicle to
be moving 1.6 to 3.2 km/h (1 to 2 mph).
2. Turn the knob to 4
n. Wait for the 4n
indicator light to stop flashing before
shifting the transmission into gear.
If the transmission is in gear and/or moving
more than 5 km/h (3 mph), the 4
nindicator
light will flash for 30 seconds, but will not
complete the shift. After 30 seconds the
transfer case will shift to 4
m. Turn the knob
to 4
mto see the indicator. With the vehicle
moving less than 5 km/h (3 mph), and the
transmission in N (Neutral), attempt the shift
again. Shifting Out of 4
n
1. To shift out of 4nthe vehicle must be
stopped or moving less than 5 km/h
(3 mph) with the transmission in
N (Neutral) and the ignition on. It is best
for the vehicle to be moving
1.6 to 3.2 km/h (1 to 2 mph).
2. Turn the knob to 4
mor 2m. Wait for the
4
mor 2mindicator light to stop flashing
before shifting the transmission
into gear.
If the transmission is in gear and/or moving
more than 5 km/h (3 mph), the 4
mor 2m
indicator light will flash for 30 seconds, but
will not complete the shift. With the vehicle
moving less than 5 km/h (3 mph), and the
transmission in N (Neutral), attempt the shift
again.
Shifting Into N (Neutral)
To shift: 1. Park the vehicle on a level surface.
2. Set the parking brake and press and hold the brake pedal. See Parking Brake
0 203.
3. Start the vehicle or turn the ignition on.
4. Shift the transmission to N (Neutral). 5. Shift the transfer case to 2
m.
6. Turn the transfer case knob clockwise to N (Neutral) until it stops and hold it
there until the N (Neutral) light starts
flashing. This will take at least
10 seconds. Then slowly release the knob
to the 4
nposition. The N (Neutral) light
will come on when the transfer case
shift to N (Neutral) is complete.
7. With the engine running, verify that the transfer case is in N (Neutral) by shifting
the transmission to R (Reverse), then to
D (Drive). There should be no movement
of the vehicle while shifting the
transmission.
8. Turn the engine off, and the ignition to ACC/ACCESSORY.
9. Place the transmission shift lever in P (Park). See Recreational Vehicle Towing
0 297.
10. Turn the ignition off.
Shifting Out of N (Neutral)
To shift:1. Set the parking brake and apply the brake pedal.
2. Turn the ignition on with the engine off.
3. Shift the transmission to N (Neutral).