You should take the car for solving the problem of car engine. This B1648 Code may appear when the car is verified for diagnosis. The problem of the car is necessary to solve if you want to drive the car without any fault. You have to take car to a certain place where the car problem can be fixed. Dictionary meaning 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 8 for PCM Stack Overrun.