The automobile dictionary meaning of the car engine P2231 Code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 2 for Accelerator Pedal Position (APP) Sensor 1 Performance. 3 for Cruise Control Servo Indicates Low. 1 for TFP Valve Position Switch-Drive Without Drive Ratio. The car engine P2231 code seems a kind of powertrain problem. This powertrain problem can be fixed easily and for this reason, you do not need to change or add any parts in the car engine. When the car engine is ok, then test the car engine by a test drive.