OnStar Services

See also:

Engine Specifications
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SERVICE BRAKE ASSIST
This message displays if there is a problem with the brake system. The brake system warning light and the antilock brake system (ABS) warning light may also display on the instrument panel cl ...

Tire Messages
SERVICE TIRE MONITOR SYSTEM On vehicles with the Tire Pressure Monitor System (TPMS), this message displays if a part on the TPMS is not working properly. The tire pressure light also flashes and ...