Chevrolet 2008 Impala Owner's Manual page 160

Traction Control System (TCS)
Warning Light
If the warning light does not come on then, have it fixed
so it will be ready to warn you if there is a problem.
If it stays on, or comes on when you are driving
a SERVICE TRACTION CONTROL message will appear
in the Driver Information Center (DIC). This indicates
that there may be a problem with your traction control
system and your vehicle may need service. When
this warning light is on and the SERVICE TRACTION
CONTROL message appears on the DIC, the system
will not limit wheel spin. Adjust your driving accordingly.
If the traction control system is manually turned off,
this light will come on and the TRACTION
CONTROL OFF message will appear on the DIC.
3-36
This warning light should
come on briefly when the
engine is started.
When the system is active, the light will flash while the
system is limiting wheel spin or assisting you in
controlling the vehicle. You may also feel or hear the
system working. This is normal.
See Traction Control System (TCS) on page 4-6 and
DIC Warnings and Messages on page 3-52 for
more information.
Electronic Stability Control
Indicator Light
If the warning light does not come on then, have it fixed
so it will be ready to warn you if there is a problem.
This light may come on after you first start to drive and
the STABILITRAK NOT READY message will appear
in the Driver Information Center (DIC). See Electronic
Stability Control on page 4-7 for more information.
This warning light should
come on briefly when the
engine is started.