The engine P20BC Code is linked with the engine of the automobile and due to the engine problem the code comes. It is significant to fix the engine and then the code will disappear from the code reader. In the engine code reader, the code comes for that problematic area when it tries to check the area and failed then the code derives for that area. The general meaning of the code is not important. With the general meaning, you cannot fix the car engine problem. The engineer needs to know the manufacturer information for solving the car engine. Read the manual of the car to know more.