The automobile dictionary meaning of the engine P0671 Code is not perfect thing for solving the car engine and fixing the car engine is not easy. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 6 for Vehicle Speed Control And Idle Control System. 7 for Vehicle Speed Output Circuit and 1 for TFP Valve Position Switch-Drive Without Drive Ratio. The engine P0671 code is a kind of powertrain problem and it is not very difficult thing to solve the car engine’s problem. When the car is ok, take it for a test drive.