When an automobile engineer wants to fix the car engine, the car engine P1301 Code helps to fix the car engine properly. That is why, the real meaning of the code is used. The engine code is important thing but it does not swiftly if real meaning of the code is not used. The automobile dictionary meaning of the code can be used and it 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. 0 for IC Circuit High Voltage and 1 for TFP Valve Position Switch-Drive Without Drive Ratio.