The general mening of the engine U1125 Code is not very helping thing and it is found online easily. Do not use the automobile dictionary meaning of the code for fixing the car engine problem. The meaning of the engine code is available from different car manufacturers and you should use the meaning of the code from your car manufacturer. The car manufacturer of your car set a meaning of the code what is linked with your car model. You must find the appropriate meaning of the code and if you have proper experience, knowledge and tools, you can try to fix the car engine problem.