Black plate (40,1)
GMC Sierra Denali Owner Manual (GMNA Localizing-U.S/Canada/Mexico-
7299750) - 2015 - CRC - 6/9/14
9-40
Driving and Operating
The settings are:
N (Neutral):
Shift the transfer case
to N (Neutral) only when towing the
vehicle. 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 on page 9-48
.
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 in ON/RUN
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
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