The engine P250D Code is a powertrain problem and this problem is easy to solve and it is not necessary to change any part of the car engine problem. The car engine has general meaning and it is P for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 5 for Computer And Auxiliary Outputs. 0 for IC Circuit High Voltage and D for TFP Valve Position Switch-Drive Without Drive Ratio. Do not drive the car with the car engine problem. If you find the real meaning of the code and you have expertise, you can try to solve the car engine.