The universal meaning of the C1223 Code is found online that 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. 3 for Transmission Control Module Reprogrammable Memory. The C1223 engine code seems a kind of chassis problem what is easy to solve and not costly. There are now 2 main types of cylinder deactivation methods used depending on the type of engine. The lifters are incapable to elevate their companion pushrods under the valve rocker arms, ensuing in valves that cannot be activated and endure closed.