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 OnStar Additional Information , and an Advisor can run a check.

    See also:

    Hydroplaning
    Hydroplaning is dangerous. Water can build up under the vehicle's tires so they actually ride on the water. This can happen if the road is wet enough and you are going fast enough. When the ve ...

    Fuel System Messages
    FUEL LEVEL LOW This message displays when the vehicle is low on fuel. Refuel as soon as possible. ...

    Cruise Control
    : Press to turn the cruise control system on and off. An indicator light will turn on or off in the instrument cluster. : Press to disengage cruise control without erasing the set speed from ...