The general meaning of the P0020 Code explains about the area of the engine and the automobile engineer needs to access the area and fix the problem from the car engine. However, the code has started with the P and it means that Powertrain of the engine has the problem. The dictionary meaning of the 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 0 for Transmission Engaged At High Throttle Angle. It is easy to fix.