The powertrain problem of the car engine is not difficult to solve and you need to use the right meaning of the code for solving the car engine. Do not use false meaning of the engine P0866 Code, you may get new problems in the car engine. Be careful when you seek for the meaning of the code and do not use any meaning of the code what is not suitable for your car engine. Without changing any component, the powertrain can be fixed. When the powertrain problem is fixed, a test drive is highly recommended for ensuring the car engine is ok.