GMC 2015 Sierra Owner's Manual page 314

See If the Vehicle Is Stuck on
page 9-14 and Turning the
Systems Off and On later in this
section.
When the transfer case (if equipped)
is in Four-Wheel Drive Low, the
stability system is automatically
disabled, comes on, and the
appropriate message will appear on
the DIC. Both traction control and
StabiliTrak are automatically
disabled in this condition.
The indicator light for both systems
is in the instrument cluster. This
light will:
Flash when TCS is limiting
wheel spin.
Flash when StabiliTrak is
activated.
Turn on and stay on when either
system is not working.
If either system fails to turn on or to
activate, a message displays in the
Driver Information Center (DIC), and
comes on and stays on to
indicate that the system is inactive
and is not assisting the driver in
maintaining control. The vehicle is
safe to drive, but driving should be
adjusted accordingly.
If comes on and stays on:
1. Stop the vehicle.
2. Turn the engine off and wait
15 seconds.
3. Start the engine.
Drive the vehicle. If comes on
and stays on, the vehicle may need
more time to diagnose the problem.
If the condition persists, see your
dealer.
Driving and Operating
Turning the Systems Off
and On
The button for TCS and StabiliTrak
is on the center stack.
Caution
Do not repeatedly brake or
accelerate heavily when TCS is
off. The vehicle driveline could
be damaged.
To turn off only TCS, press and
release the button. The traction
off light displays in the instrument
cluster. The appropriate message
will display in the DIC. See Ride
Control System Messages on
page 5-39. To turn TCS on again,
9-51