The engine P0609 Code tells of the car engine’s problem and the engine should be fixed properly. That is why, meaning of the code is very important thing. If wrong meaning of the code is applied, you may face very difficult problem in the car engine and solving the car engine’s problem is very difficult. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 6 for Vehicle Speed Control And Idle Control System. 0 for IC Circuit High Voltage and 9 for Kick-Down Switch Failed Short.