GM Service Manual Online
For 1990-2009 cars only

Intermittent malfunctions are difficult to accurately diagnose. The following method attempts to isolate an intermittent malfunction:

    • The ABS/TCS warning lamps will not illuminate during the ignition cycle when a Magnasteer® malfunction is detected.
    • A diagnostic trouble code will be stored at the time the malfunction occurred.
    • The history data of the DTC will be stored at the time the malfunction occurred.
    • Use the scan tool to read DTC history data.

Faulty electrical connections or wiring cause most intermittents.