The engine P0900 Code is meaningful and real meaning of the code is important thing. The automobile dictionary meaning of the code is useful for learning about the code. Do not use the automobile dictionary meaning at primary basis. The automobile dictionary meaning of the code 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 0 for Transmission Engaged At High Throttle Angle. You should be careful when you seek the real meaning of the car engine code.