The definition of the engine U1149 Code helps to solve the car engine problem if right meaning of the code is followed. 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. 4 for BBV Sensor Circuit Low Voltage and 9 for Kick-Down Switch Failed Short. Network problem of the car engine can be solved easily. In their distorted state, the lifters are incapable to lift their companion pushrods under the valve rocker arms, ensuing in valves that cannot be activated and endure closed.