See also:

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 ...

STEP ON BRAKE TO RELEASE PARK BRAKE
For vehicles with the electric parking brake, this message displays if you try to release the park brake system without first pressing the brake pedal. See the electric parking brake informa ...

Ending a Call
Turn or press the MENU/SELECT knob and select Hang Up. ...