The engine P0056 Code is declaration of the car engine problem. So, it becomes easy to know the problem and solve the car engine problem. The genuine meaning of the code is found from the car engine manual and that is why, the engineer needs to know the accurate meaning of the code what is related with the model and manufacturer of the car. The P0056 engine code seems a kind of powertrain problem and it is easy to solve the car engine. Do not drive the car with any type of engine problem. You should keep find all necessary information.