The automobile meaning of the engine U1115 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 5 for Park or Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit. For the network problem, the car engine problem can be solved easily. In their distorted state, the lifters are unable to lift their companion pushrods under the valve rocker arms, resulting in valves that cannot be motivated and remain closed. Do not drive the car with any problem of the car engine. It necessary to fix the car engine problem as soon as possible.