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:

    Steering Wheel Controls
    Vehicles with audio steering wheel controls could differ depending on the vehicle's options. Some audio controls can be adjusted at the steering wheel. and (Next/Previous): Press to select pres ...

    Fuel System Messages
    ECO MODE ON On some models, this message displays when the fuel economy mode has been turned on by pressing the eco button near the shift lever. See Fuel Economy Mode on page 9‑31 for more ...

    Adding Washer Fluid
    Open the cap with the washer symbol on it and add washer fluid until full. See Engine Compartment Overview on page 10‑6 for reservoir location. Notice ○ When using concentrated washe ...