The engine code has various explanations from various sources. You will pick the meaning of the code what is found from your car manufacturer. 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. 3 for IC Module 4X Ref Circuit Intermittent, No Pulses. 4 for BBV Sensor Circuit Low Voltage and 9 for Kick-Down Switch Failed Short. You can use this meaning of the code when you have no right meaning of the code. You should be careful when you look for the meaning of the car engine code.