The engine B2439 Code is necessary thing and if the real meaning of the code is unknown, it is impossible to fix the car engine problem. The car engine code is available in different meanings but it is necessary to get the real meaning of the code and you get it from the manufacturer. The general meaning of the code is found online and general meaning of the code is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 2 for MFG – Manufacturer Specific. 4 for Transmission. 3 for Cruise Control Servo Indicates Low and 9 for Kick-Down Switch Failed Short.