The general or automobile dictionary meaning of the car engine P2439 Code lets you know a common meaning for solving the car engine. The general or automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 4 for Transmission. 3 for Cruise Control Servo Indicates Low and 9 for Kick-Down Switch Failed Short. The car P2439 engine code is a kind of powertrain problem and you do not need to work hard or invest more money to solve this engine problem. It is very easy and fast to fix.