The automobile meaning of the engine U1111 Code is not necessary thing but some people want to know the meaning of the code and it is found online. The automobile meaning of the engine code is U for Network Code Problem is climate control system, lighting, airbags, etc. 1 for MFG – Manufacturer Specific. 1 for Transmission. 1 for Low Coolant Circuit and 1 for TFP Valve Position Switch-Drive Without Drive Ratio. You must find the real meaning of the code for fixing the car engine problem. You must read the car engine manual or car manual for finding the car engine problem.