Special Application Services

• Severe Commercial Use Vehicles Only: Lubricate chassis components every 5 000 km/3,000 mi.
• Have underbody flushing service performed once a year.

    See also:

    New for 2011
    The Sierra Hybrid gets GM's OnStar 9.0 telematics system that GM says provides better voice recognition. GM also said they have worked to cut down on the amount of wind noise occupants hear. ...

    Engine Overheating
    The vehicle has an indicator to warn of engine overheating. There is an engine coolant temperature warning light on the vehicle's instrument panel. See Engine Coolant Temperature Gauge on page ...

    Manual Liftgate
    To unlock the liftgate, press the power door lock switch or press " on the Remote Keyless Entry (RKE) transmitter twice. See Remote Keyless Entry (RKE) System Operation on page 2‑3. To ...