Ford P0691 OBD-II Trouble Code Definition: P0691 Fan 1 Control Circuit Low P0691 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0691 Fan 1 Control Circuit Low What does the code mean? OBD-ii Code P0691 definition: The Front Control Module (FCM) has detected a short to ground in the cooling fan relay 1 control circuit Symptoms Sumptoms […]