GMC Savana 2011 Owner's Manual page 244

9-36 Driving and Operating
To turn on the StabiliTrak system,
press the StabiliTrak button again.
StabiliTrak will automatically turn
back on when the vehicle speed
exceeds 32 km/h (20 mph).
One chime is heard and the
StabiliTrak light will turn off.
When the StabiliTrak system has
been turned off, system noises
may still be heard as a result of the
brake-traction control coming on.
It is recommended to leave the
system on for normal driving
conditions, but it may be necessary
to turn the system off if the vehicle
is stuck in sand, mud, ice or snow,
and you want to rock the vehicle to
attempt to free it. See If the Vehicle
is Stuck on page 9 11.
StabiliTrak System Operation
The StabiliTrak system is normally
on, except when the system is
initializing or has been disabled
with the StabiliTrak button. The
StabiliTrak system will automatically
activate to assist the driver in
maintaining vehicle directional
control in most driving conditions.
When activated, the StabiliTrak
system may reduce engine power
to the wheels and apply braking to
individual wheels as necessary
to assist the driver with vehicle
directional control. If cruise control
is being used when StabiliTrak
activates, the cruise control
automatically disengages. The
cruise control can be re-engaged
when road conditions allow. See
Cruise Control on page 9 37.
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, see your dealer for service.
I n f o r ma t i o n P r o v i d e d b y :
Traction Control Operation
TCS is part of the StabiliTrak
system. TCS limits wheel spin
by reducing engine power to the
wheels and by applying brakes
to each individual wheel 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.
TCS may activate on dry or rough
roads or under conditions such as
heavy acceleration while turning or
abrupt upshifts/downshifts of the
transmission. When this a reduction
in acceleration may be noticed, or
a noise or vibration may be heard.
This is normal.