Due to the car engine’ problem, you cannot drive the car and that is why, you should fix the car engine immediately. When the car engine is tested, the engine P0723 Code may come if the this problem is located in the car engine. Follow the right meaning of the code for solving the car engine problem but you can learn some information from the automobile dictionary meaning of the code and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 7 for Auxiliary Emission Controls. 2 for Air Conditioning (A/C) Clutch Feedback Circuit High Voltage and 3 for Transmission Control Module Reprogrammable Memory.