The powertrain problem of the car engine is easy to fix. The engine P0805 Code lets you know the problem of the car engine. The general meaning of the engine code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 8 for Ignition System Or Misfire. 0 for IC Circuit High Voltage and 5 for Park/Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit. The engine code is an important thing. You should not fix the car engine by any other wrong meaning of the car engine. You should be careful if the car engine is not ok.