You should take the car in the repair center for fixing the problem of the car engine. This B1649 Code may come when the car problem verifying. The code problem is necessary to solve. You have to take car to a certain place where the car problem can be fixed. The dictionary meaning of the code 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. 4 for BBV Sensor Circuit Low Voltage and 9 for Kick-Down Switch Failed Short.