GMC Acadia 2013 Owner's Manual page 244

9-28 Driving and Operating
SERVICE STABILITRAK, the
StabiliTrak light will come on and
stay and four chimes are heard.
If these conditions are observed,
turn the vehicle off, wait
15 seconds, and then turn it back
on again to reset the system. If any
of these messages still appear on
the Driver Information Center (DIC),
the vehicle should be taken in for
service. For more information on the
DIC messages, see Ride Control
System Messages on page 5 37.
The StabiliTrak light will flash on the
instrument cluster when the system
is both on and activated.
The system may be heard or felt
while it is working; this is normal.
The traction control button is located
on the center stack.
The traction control part of
StabiliTrak can be turned off by
pressing and releasing the traction
control button.
Traction control can be turned on by
pressing and releasing the traction
control button and the appropriate
TRACTION CONTROL ON
message will be displayed, if not
automatically shut off for any other
reason.
When the traction control system is
turned off, the appropriate
TRACTION CONTROL OFF
message will be displayed on the
DIC. The vehicle will still have
brake-traction control when traction
control is off, but will not be able to
use the engine speed management
system. See Traction Control
Operation following for more
information.
When the traction control system
has been turned off, system noises
may be heard and felt as a result of
the brake-traction control working.
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. 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 the Vehicle Is Stuck
on page 9 9.
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 the brakes as necessary.