Ford P1644 OBD-II Trouble Code Definition: P1644 TP Output Circuit P1644 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P1644 TP Output Circuit Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. PSA OBD Trouble Code P1644 Fuel pump speed control circuit malfunction Sorry no other information,Please help us to improve,Any information is appreciated.Thanks. VAG […]