Ford P1817 OBD-II Trouble Code Definition: P1817 TFP Valve Position Switch-Reverse With Drive Ratio P1817 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P1817 TFP Valve Position Switch-Reverse With Drive Ratio Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. PSA OBD Trouble Code P1817 Transmission Neutral safety switch Open circuit Sorry no other information,Please […]