Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems.
It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System.
If a diagnostics check is needed between e-mails, push 
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Advisor can run a check.
See also:
Traction Control System (TCS)
The traction control system limits
wheel spin. The system turns on
automatically every time the vehicle
is started.
- To turn off traction control, press
and release the TCS/StabiliTrak
but ...
Wheel Replacement
Replace any wheel that is bent, cracked, or badly rusted or corroded. If
wheel nuts keep coming loose, the wheel, wheel bolts, and wheel nuts should be
replaced.
If the wheel leaks air, replace i ...
Parking Brake (Manual)
he parking brake pedal is located
on the lower portion of the
instrument panel to the left of the
steering wheel.
To set the parking brake, hold the
brake pedal down, then push the
parkin ...