The engine P0125 Code has various meanings and finding the right meaning is important thing. If the real meaning of the engine is found, do not use other meanings. The automobile dictionary meaning of the code gives general information of the code and it is not used for fixing the car engine. Short meaning of the is Insufficient Coolant Temperature for Closed Loop Fuel Control. Do not drive the car until the car engine is solved. There are different reasons the car engine code may appear on the car engine code reader. Fixing the car engine is necessary for driving the car safely.