If powertrain has any problem, then the engine P254D Code may come. Although the car powertrain problem is not very serious thing but you must take it seriously. You must not take it light. Because, the problem of the car engine is linked with the car engine. Any engine problem can create serious problem what is forgettable. Do not drive the car with the car engine problem. If you do not know how to fix the car engine and you do not have all tools for solving the car engine, you should handover the car to the automobile engineer for solving the car engine.