You can learn the automobile dictionary sense of the code and the engine P0901 Code’s automobile dictionary meaning is found online and you do not need to struggle many times for getting this general meaning. Without using general meaning of the code, do not try to fix the car engine. You can learn general information from the automobile dictionary meaning and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 9 for Fuel And Air Metering (Injector Circuit Malfunctions Only). 0 for IC Circuit High Voltage and 1 for TFP Valve Position Switch-Drive Without Drive Ratio.