The automobile meaning of the engine code is known as general meaning. The engine P1805 Code is found from the car engine and it has several meanings. The right meaning of the code is the most important thing. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 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. If you do not know the right meaning of the code, you can use this general meaning of the code.