The automobile dictionary meaning of the C1222 Code is related with the car engine but it gives general information what you cannot use for all car engines. The general meaning of the code is C for Chassis Code Problem is controller area network wiring bus and modules. 1 for MFG – Manufacturer Specific. 2 for Accelerator Pedal Position (APP) Sensor 1 Performance. 2 for Air Conditioning (A/C) Clutch Feedback Circuit High Voltage and 2 for A/C System High Pressure High Temperature. The C1222 engine code seems a kind of chassis problem. The engine C1222 code had an sumptuous diagnostics procedure, including presentation engine trouble codes on the air conditioning display.