GMC Sierra 2023 Manual page 99

98 Driving and Operating
Caution
Shifting the transmission into gear before
the requested mode indicator light has
stopped flashing could damage the
transfer case.
If the transmission is not shifted into
N (Neutral) or the vehicle has not slowed to
5 km/h (3 mph) within 20 seconds, the
transfer case will remain in its original state.
This will be indicated in the instrument
cluster.
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 into N (Neutral):
1. Start the vehicle.
2. Shift the transmission to N (Neutral).
3. Shift the transfer case to 2 .
4. Apply the parking brake and/or brake
pedal.
5. Press 2 five times in 10 seconds until
the N (Neutral) graphic starts flashing in
the instrument cluster. When the shift is
complete, the graphic stops flashing.
If the parking brake and/or brake pedal
is not applied within 20 seconds, the
transfer case will remain in the original
state.
6. If the transmission is not shifted into
N (Neutral) or the vehicle has not slowed
to 5 km/h (3 mph) within 20 seconds,
the transfer case will remain in its
original state. This will be indicated in
the instrument cluster.
Shifting Out of N (Neutral)
To shift out of N (Neutral):
1. Start the vehicle.
2. Set the parking brake. See Electric
Parking Brake 0 99.
3. Shift the transmission to N (Neutral).
4. Shift the transfer case to 2 . Transfer
case shifts out of N (Neutral) can only be
made into 2 . When the shift to 2 is
complete, the graphic in the instrument
cluster will stop flashing. If the transfer
case cannot complete a shift, the graphic
will return to the previously selected
setting.
Single Speed Transfer Case
Work Truck and Custom
Uplevel Shown, Base Level Similar