Chevrolet 2010 Impala Owner's Manual page 244

The system may be heard or felt while it is working, but
this is normal.
If cruise control is being used when TCS begins to limit
wheel spin, the cruise control will automatically
disengage. Cruise control may be reengaged when road
conditions allow. See Cruise Control on page 4-6.
The TCS operates in all transmission shift lever
positions. But the system can upshift the transmission
only as high as the shift lever position chosen, so
use the lower gears only when necessary. See
Automatic Transmission Operation on page 3-24.
5-8
This light will flash when
the TCS is limiting
wheel spin.
A SERVICE TRACTION CONTROL message also
appears on the DIC. When this warning light is on, the
system will not limit wheel spin. Adjust your driving
accordingly. See DIC Warnings and Messages
on page 4-44 for more information.
To limit wheel spin, especially in slippery road
conditions, TCS should always be left on. But the
system can be turned off if needed. Turn the system off
if the vehicle gets stuck in sand, mud or snow and
rocking the vehicle is required. See Rocking Your
Vehicle to Get It Out on page 5-20 and If Your Vehicle
is Stuck in Sand, Mud, Ice, or Snow on page 5-19
for more information.
When the system is on,
this warning light comes
on and stays on if there is
a problem.