Ford P1803 OBD-II Trouble Code Definition: P1803 Immobilizer ECU Signal Error P1803 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P1803 Immobilizer ECU Signal Error Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. PSA OBD Trouble Code P1803 Transmission clutch Interlock safety switch short circuit to ground Sorry no other information,Please help us to […]