GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-11349177) - 2018 - crc - 5/11/17
Driving and Operating
265
The settings are:
N (Neutral) :
Use only when the
vehicle needs to be towed.
See
or
.
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
n
if
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
n
will turn Traction
Control and StabiliTrak off. See
Traction Control/Electronic Stability
Control
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, when
off-roading, or when plowing snow.
The vehicle can be shifted from 2
m
to 4
m
while the vehicle is moving.
Shifting Into 4
m
Turn the knob to 4
m
at 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.
Shifting Into 2
m
Turn the knob to 2
m
at any speed,
except when shifting from 4
n
.
Shifting Into 4
n
When 4
n
is 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 4
n
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
n
indicator light will flash for
30 seconds and not complete the
shift. After 30 seconds the transfer
case will shift to 4
m
. Turn the knob
to 4
m
to 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 4
n
the vehicle
must be stopped or moving
less than 5 km/h (3 mph) with
the transmission in N (Neutral)
and the ignition in on. It is best
for the vehicle to be moving
1.6 to 3.2 km/h (1 to 2 mph).