GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 141

If the vehicle has StabiliTrak
Four-Wheel-Drive Low will turn Traction Control and
®
StabiliTrak off. See StabiliTrak
CAUTION:
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Shifting the transfer case to N (Neutral) can
cause the vehicle to roll even if the transmission
is in P (Park). You or someone else could be
seriously injured. Be sure to set the parking brake
before placing the transfer case in N (Neutral).
See Parking Brake on page 2-50.
N (Neutral): Shift the vehicle's transfer case to
N (Neutral) only when towing the vehicle. See
Recreational Vehicle Towing on page 4-47 or Towing
Your Vehicle on page 4-47 for more information.
If the SERVICE 4–Wheel Drive message stays on,
you should take the vehicle to your dealer/retailer for
service. See "Service 4–Wheel Drive message"
under DIC Warnings and Messages on page 3-66.
®
, shifting into
®
System on page 4-6.
Shifting Into Two-Wheel-Drive High
Turn the knob to the Two-Wheel-Drive High position.
This can be done at any speed, except when shifting
from Four-Wheel-Drive Low. See Shifting Out of
Four-Wheel-Drive Low for more information.
Shifting Into Four-Wheel Drive Low
When Four-Wheel-Drive Low is engaged, vehicle speed
should be kept below 45 mph. Extended high-speed
operation in Four-Wheel-Drive Low may damage or
shorten the life of the drivetrain.
To shift to the Four-Wheel-Drive Low position, the
ignition must be in ON/RUN and the vehicle must be
stopped or moving less than 3 mph (5 km/h) with
the transmission in N (Neutral). The preferred method
for shifting into Four-Wheel-Drive Low is to have
the vehicle moving 1 to 2 mph (1.6 to 3.2 km/h).
Turn the knob to the Four-Wheel-Drive Low position.
You must wait for the Four-Wheel-Drive Low indicator
light to stop flashing and remain on before shifting
the transmission in gear.
Notice: Shifting the transmission into gear before
the requested mode indicator light has stopped
flashing could damage the transfer case. To help
avoid damaging the vehicle, always wait for the mode
indicator lights to stop flashing before shifting the
transmission into gear.
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