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:

    Torque Lock
    Torque lock is when the weight of the vehicle puts too much force on the parking pawl in the transmission. This happens when parking on a hill and shifting the transmission into P (Park) is ...

    Checking Brake Fluid
    You can check the brake fluid without taking off the cap. Look at the brake fluid reservoir. The fluid level should be above MIN. If it is not, have your brake system checked to see if there ...

    If Steam Is Coming From Your Engine
    CAUTION: Steam from an overheated engine can burn you badly, even if you just open the hood.Stay away from the engine if you see or hear steam coming from it. Just turn it off and get everyone ...