The engine P0115 Code is very important thing and finding the real meaning of the code is very helpful. The meaning of the engine code is ECT Sensor Circuit Malfunction Problem. For understating the problem of the car engine diagnosis is necessary. The engine can be diagnosed by scanning and checking documents the codes established and assessment the restriction frame data to see when the code was set. Another process of verification of the engine is resetting the codes to clear the OBD-II fault codes and retests the automobile to confirm if the code comes back. Do not drive the car with any engine problem.