You need to fix the car engine and for solving the car engine, you should solve the car engine properly. The engine P0906 Code may come on the screen of the engine code reader if the problem is found on the place of the car engine area P0906. The problem is powertrain problem and this problem is not terrible thing but this small problem can be so serious for your life. Do not allow wrong meaning when you want to fix the car engine. Wrong meaning of the code may bring new problem in the car engine. Those problems can be so serious.