Do not drive the car with the car engine problem and the engine code is found by the testing of the car engine. This engine P0831 Code is found from the car engine when the car engine is tested. The engine should be fixed by an automobile engine to know the real cause of the engine problem. Here, the powertrain of the car engine is problematic and this problem is not difficult to solve if all things are available including the real meaning of the code. Do not drive the car when you locate the engine has any problem. A test drive is finally recommended.