The engine U1112 Code has various meanings and the real is very important. The automobile dictionary meaning of the engine code is not important and it is found online. The general meaning or the automobile meaning of the 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 2 for A/C System High Pressure High Temperature. Read the car engine manual where you will get necessary information for solving the car engine. Manufacturers set the real meaning of the engine code.