The B1864 Code is associated with the car engine and you can easily know all meanings of the code if you have the manufacturer name and model number. This code has a dictionary meaning and it is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 8 for Ignition System or Misfire. 6 for Control Module Throttle Actuator Position Performance and 4 for Cruise Vehicle Speed or Set Speed Difference Too High. You can know the real meaning of the code if you know the manufacturer name and model number of the car.