Ford P1816 OBD-II Trouble Code Definition: P1816 TFP Valve Position Switch-Park/Neutral With Drive Ratio P1816 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P1816 TFP Valve Position Switch-Park/Neutral With Drive Ratio Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. PSA OBD Trouble Code P1816 Transmission Neutral safety switch circuit failure Sorry no other information,Please […]