The engine U1188 Code has verities of meaning and real meaning of the code is necessary to apply for solving the car engine problem. The engine code’ meaning is found online for free and that is U for Network Code Problem is climate control system, lighting, airbags, etc. 1 for MFG – Manufacturer Specific. 1 for Transmission. 8 for Exhaust Gas Recirculation System Valve 1 and 8 for PCM Stack Overrun. Do not use different meanings of the car engine from different car manufacturers. Your car engine manufacturer has provided correct meaning of the code and the automobile engineer must seek that meaning for solving the car engine issue.