OnStar®

If equipped, this vehicle has a comprehensive, in-vehicle system that can connect to a live Advisor for Emergency, Security, Navigation, Connection, and Diagnostic Services. See OnStar Overview  .

    See also:

    Engine Oil
    To ensure proper engine performance and long life, careful attention must be paid to engine oil. Following these simple, but important steps will help protect your investment: - Always use engine ...

    Engine & Transmission
    The CTS comes standard with a 3.0-liter V-6 engine, but our test car's optional 3.6-liter V-6 and six-speed automatic transmission are a special pair among drivetrains. The transmission's shifts a ...

    License Plate Lamp
    1. Remove the two screws holding each of the license plate lamps to the molding that is part of the liftgate. 2. Twist and pull the license plate lamp assembly forward through the molding openi ...