The powertrain problem is related with the engine and the engine code P254B Code is found in many car engines. You will get online code . The code is meaningful and the correct meaning is from the car manufacturer. You find the meaning of the code from different car manufacturers. Your car engine manufacturer gives a meaning of the code and you need to know that meaning for solving the car engine. If you use wrong meaning of the code what may makes terrible situation in the car engine. Do not follow automobile meaning of the code, it is not suitable for your car engine.