Connector Corrosion

It often appears as green or white deposits. Moisture and road salt are common causes. It can cause intermittent faults and false codes. After cleaning, a thin layer of dielectric grease on the seal area can help keep moisture out. Connectors near the wheels, under the battery and in door hinges are especially exposed.

Corrosion forms a poor conductive layer between terminals.

Clean terminals with contact cleaner rather than abrasive tools where possible. Badly corroded terminals should be replaced.