GMC 2011 Sierra Denali Owner's Manual page 300

9-48 Driving and Operating
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
1.6 to 3.2 km/h (1 to 2 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.
Shifting into Neutral
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 Parking Brake on
page 9 50 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.
7. If the engine is running, verify
that the transfer case is in
N (Neutral) by shifting the
transmission to R (Reverse) for
one second, then shift the
transmission to D (Drive) for
one second.
8. Turn the ignition to ACC/
ACCESSORY, which will turn the
engine off.
9. Place the transmission shift
lever in P (Park).
10. Release the parking brake prior
to moving the vehicle.
11. Turn the ignition to LOCK/OFF.
Shifting Out of Neutral
To shift the transfer case out of
N (Neutral):
1. Set the parking brake and apply
the regular brake pedal.
2. Turn the ignition to ON/RUN with
the engine off, and shift the
transmission to N (Neutral).
3. Turn the transfer case dial to
Two-Wheel Drive High.
After the transfer case has
shifted out of N (Neutral), the
N (Neutral) light will go out.
4. Release the parking brake prior
to moving the vehicle.