All-Wheel Drive (Awd) System - GMC 2007 Savana Van Owner's Manual

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The StabiliTrak system may also turn off
automatically if it determines that a problem exists
with the system. If the problem does not clear
itself after restarting the vehicle, you should see
your dealer for service.
Traction Control Operation
The traction control system is part of the
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StabiliTrak system. Traction control limits wheel
spin by reducing engine power to the wheels
(engine speed management) and by applying
brakes to each individual wheel (brake-traction
control) as necessary.
If the brake-traction control system activates
constantly or if the brakes have heated up due to
high speed braking, the brake-traction control
will be automatically disabled. The system
will come back on after the brakes have cooled.
This can take up to two minutes or longer
depending on brake usage.
The traction control system may activate on dry or
rough roads or under conditions such as heavy
acceleration while turning or abrupt upshifts/
downshifts of the transmission.
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When this happens you may notice a reduction in
acceleration, or may hear a noise or vibration.
This is normal.
Adding non-GM accessories can affect your
vehicle's performance. See Accessories and
Modifications on page 286 for more information.

All-Wheel Drive (AWD) System

If your vehicle has all-wheel drive, your engine's
driving power is sent to all four wheels for
extra traction when needed.
This is like four-wheel drive, but there is no
separate lever or switch to engage or disengage
the front axle. It is fully automatic, and adjusts itself
as needed for road conditions.
You may experience a brief vehicle vibration upon
acceleration when driving in slippery conditions.
This is normal and is an indication that the
all-wheel drive system is functioning properly.