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Clearing Trouble Codes

WARNING: This page does not describe the selected car, but rather 22 other vehicles, including the 1990 GMC Vandura Special, 1990 GMC Vandura, 1990 GMC Value Van, 1990 GMC Suburban, and 1990 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.

Trouble codes should be cleared after repairs have been completed. Also, some diagnostic charts require that codes be cleared before using diagnostic chart. To clear codes, remove ECM memory battery voltage for 30 seconds.

If no hard fault codes are present (only intermittent codes exist), proceed to H - TESING W/O CODES article for intermittent diagnostic procedures.

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