GMC 2007 Envoy Denali Owner's Manual page 311

Traction Control Off
In this mode, stability control and brake-traction
control are functional. Engine speed management
will be modified and the driven wheels can spin
more freely. This can cause the brake-traction
control to activate more frequently. If the controller
detects excessive wheel spin in this mode, the
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StabiliTrak indicator light may blink and the
STABILITRAK ACTIVE message may be displayed
to warn the driver that damage may occur to the
transfer case.
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StabiliTrak Off
In this mode, both stability control and part of the
traction control system are disabled. Your vehicle
will still have brake-traction control, but will not be
able to use the engine speed management system.
You may still hear system noises as a result of the
brake-traction control coming on. If the controller
detects excessive wheel spin in this mode, the
®
StabiliTrak indicator light may blink and the
STABILITRAK ACTIVE message may be displayed
to warn the driver that damage may occur to the
transfer case.
It is recommended to leave the system on for
normal driving conditions, but it may be necessary
to turn the system off if your vehicle is stuck in
sand, mud, ice or snow, and you may want
to "rock" your vehicle in an attempt to free it. It may
also be necessary to turn off the system when
driving in extreme off-road conditions where high
wheel spin is required. See If Your Vehicle is
Stuck in Sand, Mud, Ice, or Snow on page 348 for
more information.
When the transfer case is in 4LO, the stability
system is automatically disabled. The StabiliTrak
light will come on and the STABILITRAK OFF
message will appear on the DIC. The StabiliTrak
system cannot be turned on until the vehicle is
switched to 2HI, 4HI, or 4AWD.
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