You should collect the right meaning of the car engine P2400 Code for solving the car engine problem. The right meaning of the code is found in the manual of the car engine and find the meaning by the name of the manufacturer and car model. When you do not get the meaning, you may use automobile dictionary meaning of the code and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 4 for Transmission. 0 for IC Circuit High Voltage and 0 for Transmission Engaged At High Throttle Angle.