Ford P0686 OBD-II Trouble Code Definition: P0686 Engine Control Module Power Relay Control Circuit Low P0686 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0686 ECM/PCM Power Relay Control Circuit Low What does the code mean? OBD-ii Code P0686 definition: The Engine Control Module (ECM) has detected a low voltage condition to the ECM. Symptoms Sumptoms of […]