The general meaning or the automobile dictionary meaning of the car engine P2431 Code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 4 for Transmission. 3 for Cruise Control Servo Indicates Low and 1 for TFP Valve Position Switch-Drive Without Drive Ratio. Do not use this meaning of the code if you have the right meaning. The car engine should be fully ok if you have fixed by an expert automobile engineer. Do not allow inexpert someone to check and solve the car engine problem. If you do so, then new problem may start in the car engine.