The C1100 Code come from the Chassis of the car and the code C1100 OBD2 reports a sensor problem, extra of the sensor is dubious to solve the original problem. The liability is the most likely to be produced by the systems that the sensor is monitoring, but it might even be produced by the wiring to the sensor itself. C means Chassis Code – Problem is controller area network wiring bus and modules. 1 means MFG – Manufacturer Specific. 1 means Fuel And Air Metering. 0 means Air Conditioning (A/C) Clutch Feedback Circuit High Voltage and 0 for Transmission Engaged At High Throttle Angle.