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 Advisor can run a check., and an Advisor can run a check.

    See also:

    STEP ON BRAKE TO RELEASE PARK BRAKE
    This message is displayed if you attempt to release the electric parking brake without the brake pedal applied. See Parking Brake for more information. ...

    Power Steering Fluid
    See Engine Compartment Overview for information on the location of the power steering fluid reservoir. ...

    When to Change Engine Oil
    Your vehicle has a computer system that lets you know when to change the engine oil and filter. This is based on engine revolutions and engine temperature, and not on mileage. Based on driving c ...