Pontiac G5 2009 Owner's Manual page 211

If the system fails to turn on or activate, the ESC/TCS
light comes on, and the ESC OFF and/or SERVICE ESC
message displays.
For more information, see Driver Information Center
(DIC) on page 3-39 and Electronic Stability Control
(ESC)/Traction Control System (TCS) Indicator/Warning
Light on page 3-32.
ESC activates when the computer senses a discrepancy
between the intended path and the direction the vehicle is
actually travelling. ESC selectively applies braking
pressure at any one of the vehicle's brakes to help steer
the vehicle in the direction which you are steering.
This light flashes on the
instrument panel cluster
when the ESC system
is on and activated.
When the system activates, an ESC ACTIVE message
displays on the Driver Information Center. See DIC
Warnings and Messages on page 3-42. This light also
flashes on the instrument panel cluster when the
ESC system is on and activated. A noise may be heard
or a vibration felt in the brake pedal. This is normal.
Continue to steer the vehicle in the intended direction.
When the light is on solid and the message(s),
SERVICE ESC, ESC OFF, or both display, the system
will not assist the driver in maintaining directional
control of the vehicle. Adjust your driving accordingly.
See DIC Warnings and Messages on page 3-42.
The ESC system is automatically enabled whenever the
vehicle is started. To assist the driver with vehicle
directional control, especially in slippery road conditions,
the system should always be left on. But, ESC can
be turned off if needed.
If cruise control is being used when ESC activates, the
cruise control automatically disengages. The cruise
control can be reengaged when road conditions allow.
See Cruise Control on page 3-10.
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