The general meaning of the C1109 Code is C for Chassis Code Problem is controller area network wiring bus and modules. 1 for MFG – Manufacturer Specific. 1 for Transmission. 0 for IC Circuit High Voltage and 9 for Kick-Down Switch Failed Short. Do not use fake or general meaning of the code for solving the car engine. The manufacturer set up a correct meaning of the code and you need to get that meaning for solving the car engine. The C1109 engine code looks a kind of chassis problematic and it is easy to solve the car engine chassis problem easily.