Ford P1818 OBD-II Trouble Code Definition: P1818 TFP Valve Position Switch-Drive Without Drive Ratio P1818 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P1818 TFP Valve Position Switch-Drive Without Drive Ratio Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. PSA OBD Trouble Code P1818 Transmission Neutral safety switch Short circuit to battery Sorry no […]