GMC 2007 Envoy Denali Owner's Manual page 123

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4 (Four-Wheel High): This setting should be
used when you need extra traction, such as
on snowy or icy roads or in most off-road
situations. This setting also engages your front
axle to help drive your vehicle.
n
4 (Four-Wheel Low): This setting also
engages your front axle and delivers extra torque.
It sends maximum power to all four wheels.
You might choose this setting if you are driving
off-road in deep sand, deep mud, and climbing or
descending steep hills.
CAUTION:
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Shifting the transfer case to NEUTRAL
can cause your vehicle to roll even if the
transmission is in PARK (P). You or
someone else could be seriously injured.
Be sure to set the parking brake before
placing the transfer case in NEUTRAL.
See Parking Brake on page 126.
NEUTRAL: Shift the vehicle's transfer case to
NEUTRAL only when towing your vehicle.
See Recreational Vehicle Towing on page 355 for
more information.
An indicator light in the knob will show you which
position the transfer case is in. The indicator
lights will come on briefly when you turn on the
ignition and one will stay on. If the lights do
not come on, you should take your vehicle to your
dealer for service. An indicator light will flash
while shifting the transfer case. It will stay on when
the shift is complete. If for some reason the
transfer case cannot make a requested shift, it will
return to the last chosen setting.
If the service Four-Wheel Drive Warning Light on
the instrument panel cluster stays on, you
should take your vehicle to your dealer for service.
See Service Four-Wheel Drive Warning Light on
page 216 for further information.
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