The P0454 Code is a common engine code and this engine code is found in many car engines what is meaningful. You must use the right meaning of the code for solving the car engine. It is found that powertrain of the engine is easy to solve and you do not need to worry for it. Because, powertrain can be solved at cheap rate without changing any part from it. Do not try to fix this problem by yourself if you do not know how to solve the car engine problem. Do not drive the car if the car engine is not fixed.