The general meaning of the P0039 Code and this general meaning is available online. The dictionary meaning of the code is P means Powertrain Code Problem is related engine, transmission and emissions systems. 0 means SAE – Generic. 0 means Fuel And Air Metering. 3 means Cruise Control Servo Indicates Low and 9 means Kick-Down Switch Failed Short. Do not use this car engine information for solving the car engine. Manufacturer of the car engine has put a correct meaning for your car and the automobile engineer needs to get the manufacturer’s information for solving the car engine and it is necessary to use experience and machines.