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Vehicle and Power Issues
OnStar services require a vehicle electrical system, wireless service, and GPS satellite technologies to be available and operating for features to function properly. These systems may not o ...

Engine Power Messages
ENGINE POWER IS REDUCED This message displays when the vehicle's engine power is reduced. Reduced engine power can affect the vehicle's ability to accelerate. If this message is on, but there ...

Control Buttons
The buttons used to control the radio are: RADIO/BAND: Press to turn the radio on and choose between AM, FM, and XM™, if equipped. MENU/SELECT: Press and turn to navigate the available menus. ...