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:

    Braking in Emergencies
    ABS allows the driver to steer and brake at the same time. In many emergencies, steering can help more than even the very best braking. ...

    Power Liftgate
    On vehicles with a power liftgate, the vehicle must be in P (Park) to operate. The taillamps flash and a chime sounds when the power liftgate moves. WARNING You or others could be injured if caught ...

    Service Vehicle Messages
    SERVICE AC SYSTEM This message is displayed if there is a problem with the air conditioning system. Take the vehicle to your dealer for service. SERVICE POWER STEERING This message is displayed i ...