With the car engine P0990 Code, it becomes easier to solve the car engine and you cannot fix the car properly if you do not collect the right meaning of the code and do not let the automobile engineer to fix the car engine. The automobile dictionary meaning of the code is general information provider 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). 9 for Crankshaft Position Sensor Circuit Performance and 0 for Transmission Engaged At High Throttle Angle.