The meaning of the P0023 Code is P for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 0 for Fuel And Air Metering. 2 for Air Conditioning (A/C) Clutch Feedback Circuit High Voltage and 3 for Transmission Control Module Reprogrammable Memory. This code is not very necessary to use and this code has not real meaning for all car engine. The powertrain is the main problem and it is easy to solve. Once you have taken the car to the automobile repair center, you do not need to worry, the problem can be fixed by the automobile engineer.