With the car engine problem of P2021 Code, you cannot run the car for long. Take the car to the repair center of the car and let it check by manually and through machines. You will face several problems in the car engine if you do not fix the car problem. Different and new problems of the car engine may start. Allow an expert automobile engineer to check the and solve the car engine problem. Here, the powertrain problem is located and solve the car engine by the expert engineer. Do not fix the car engine in wrong way or wrong meaning of the engine code.