GMC 2013 Sierra Denali Owner's Manual page 269

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than 5 km/h (3 mph) and the
transmission in N (Neutral), attempt
the shift again.
To shift from Four-Wheel Drive Low
to Four-Wheel Drive High or
Two-Wheel Drive High, 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/RUN. The preferred
method for shifting out of
Four-Wheel Drive Low is to have
the vehicle moving 1.6 to 3.2 km/h
(1 to 2 mph). Turn the knob to the
Four-Wheel Drive High or
Two-Wheel Drive High position. You
must wait for the Four-Wheel Drive
High or Two-Wheel Drive High
indicator light to stop flashing and
remain on before shifting the
transmission into gear.
It is typical for the vehicle to exhibit
significant engagement noise and
bump when shifting between
Four-Wheel Drive Low and
Four-Wheel Drive High ranges or
from transfer case N (Neutral) with
the engine running.
If the knob is turned to the
Four-Wheel Drive High or
Two-Wheel Drive High switch
position when the vehicle is in gear
and/or moving more then 5 km/h
(3 mph), the Four-Wheel Drive High
or Two-Wheel Drive High 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.
To shift the transfer case to
N (Neutral):
1. Make sure the vehicle is parked
so that it will not roll.
2. Set the parking brake and press
and hold the regular brake
pedal. See
for more information.
3. Start the vehicle or turn the
ignition to ON/RUN.
4. Shift the transmission to
N (Neutral).
5. Shift the transfer case to
Two-Wheel Drive High.
6. Turn the transfer case dial
clockwise to N (Neutral) until it
stops and hold it there until the
Neutral light starts blinking. This
will take at least 10 seconds.
Then slowly release the dial to
the four low position. The
N (Neutral) light will come on
when the transfer case shift to
N (Neutral) is complete.

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