The powertrain problem of the car engine is not difficult to solve. The meaning of the P2166 Code explains about the car engine problem in detail if the real meaning of the code is found. However, if you do not know about the car engine and process of solving the car engine, you should not try to fix the car engine issue. You must give the task to an automobile engineer for solving the car engine problem. The meaning of the car engine code is found online also and that is called automobile dictionary meaning of the code what provide general information only.