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:

    Tire Rotation and Required Services Every 12 000 km/7,500 mi
    Rotate the tires, if recommended for the vehicle, and perform the following services. See Tire Rotation on page 10‑68. • Check engine oil level and oil life percentage. If needed, change engi ...

    When to Change Engine Oil
    This vehicle has a computer system that indicates when to change the engine oil and filter. This is based on a combination of factors which include engine revolutions, engine temperature, and miles dr ...

    Adding Washer Fluid
    The vehicle has a low washer fluid message on the DIC that comes on when the washer fluid is low. The message is displayed for 15 seconds at the start of each ignition cycle. When the WASHER FLUID LOW ...