The B2139 Code is important for the car engine solution. This code comes when the car engine is tested and if the engine problem is not fixed, you should not drive the car engine. The basic meaning of the code gives idea about the code and it is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 2 for MFG – Manufacturer Specific. 1 for Transmission. 3 for Cruise Control Servo Indicates Low and 9 for Kick-Down Switch Failed Short. The real meaning of the code is connected with the manufacturer and model number of the car.