The B1639 Code is connected with the car engine and every manufacturer of car has setup the engine code what is different for the manufacturer and model. The meaning of the code is necessary to know for solving the problem. Definition of the code from auto dictionary is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 6 for Vehicle Speed Control and Idle Control System. 3 for Cruise Control Servo Indicates Low. 9 for Kick-Down Switch Failed Short. If you have all necessary tools for solving the problem, you can try to solve.