OnStar Services

See also:

Wheel Alignment
Wheel alignment is critical for ensuring that the tires deliver optimal wear and performance. - Signs that the alignment may need to be adjusted include pulling, improper vehicle handling, ...

Engine Cooling System Messages
ENGINE HOT A/C (AIR CONDITIONING) OFF This message displays when the engine coolant becomes hotter than the normal operating temperature. See Engine Coolant Temperature Gauge. To avoid add ...

SERVICE ALL WHEEL DRIVE
This message displays if a problem occurs with the All-Wheel Drive (AWD) system. The vehicle will run in 2WD. This could be caused by: - An electronics problem - An AWD system oil overheat - ...