The engine P1634 Code is related with the car engine and it is important thing for solving the car engine problem. The powertrain problem can be fixed fast and without changing any part from the powertrain or engine. Even you do not need to add any new things in the car engine or powertrain. When the problem of the car engine is ok, then you will drive it. You must take help from an expert automobile engineer for solving the car engine problem. When you have solved the car engine, you may drive the car safely but before take it, you must test the car.