The engine U1109 Code helps to know the car engine problem. Do not use any meaning of the code for solving the car engine problem. The automobile meaning of the code is found online and for the car code U1109, the general meaning is U for Network Code Problem is climate control system, lighting, airbags, etc. 1 for MFG – Manufacturer Specific. 1 for Transmission. 0 for IC Circuit High Voltage and 9 for Kick-Down Switch Failed Short. The lifters can be distorted by unfastening an internal locking pin. The locking pin is disconnected using solenoids to modify oil compression fed into the lifter.