GM Service Manual Online
For 1990-2009 cars only

At times, the position of the vehicle on the map may be inaccurate due to one or more of the following reasons:

    • Road system has changed.
    • Vehicle is driving on slippery road surfaces such as in sand, gravel, and/or snow.
    • Vehicle is traveling on winding roads.
    • Vehicle is on a long straight road.
    • Vehicle is approaching a tall building or a large vehicle.
    • Surface streets run parallel to a freeway.
    • Vehicle has just been transferred by a vehicle carrier or a ferry.
    • Current position calibration is set incorrectly.
    • Vehicle is traveling at high speed.
    • Vehicle changes directions more than once, or when the vehicle is turning on a turn table in a parking lot.
    • Vehicle is entering and/or exiting a parking lot or a garage.
    • GPS signal is not received.
    • Roof carrier is installed on the vehicle.
    • Vehicle is being driven with tire chains.
    • Tires are replaced.
    • Tire pressure for the tires is incorrect.
    • Tires are worn.
    • First time the map DVD is inserted.
    • Battery is disconnected for several days.
    • Vehicle is driving in heavy traffic where driving is at low speeds, and the vehicle is stopped and started repeatedly.

See your dealer/retailer if other problems occur.