The meaning of the engine P0504 Code provides specific information of the engine problem and it is connected with the car engine. When the car engine is tested and found any problem by the engine code reader, then the code comes on the screen. The engine code is valuable for the engineer. He uses the meaning of the code for solving the car engine problem. The powertrain problem is located on the car engine and you need to fix the car engine powertrain problem. Once the car engine is fixed, then you can drive the car safely. Otherwise, you should not drive the car.