GMC YUKON XL 2003 Manual page 292

Traction Control Operation
The traction control system is part of the
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.
The traction control system is enabled automatically
when you start your vehicle, and it will activate
and display the TRACTION ACTIVE message in the
Driver Information Center (DIC) if it senses that any of
the wheels are spinning or beginning to lose traction
while driving. If you turn off Stabilitrak@ ,
only the
brake-traction control portion of traction control will work.
The engine speed management will be disabled. In
this state, engine power is not reduced automatically
and the driven wheels can spin more freely. This
can cause the brake-traction control to activate
constantly. For more information on the traction active
message, see Driver Information Center (DIC) on
page 3-52.
Notices If the traction off light comes on due to
heavy braking and/or because the traction control
system has been continuously active, do not
allow the wheel(s) of one axle to spin excessively. If
you do, the traction off light will flash to indicate
that you may be causing damage to your transfer
case. This could lead to costly repairs not covered
by your warranty. You should immediately reduce
engine power until the traction off light stops
flashing.
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 ot
longer depending on brake usage.
Notice: Don't allow the wheel(s) of one axle to spin
excessively when the traction off, ABS and brake
lights are on and the SERVICE STABILITY MESSAGE
is displayed. In this situation, the system may not
be able to flash the traction off light to warn the
driver of possible damage to the transfer case. This
could lead to costly repairs not covered by your
warranty. You should immediately reduce engine
power until the lights and messages are no longer
displayed.
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