The vehicle engine B1846 Code is associated with the car and in all popular car engines, you will get this code. Meaning of the car changes by the model and manufacturer of the car. Body of the engine has the main problem and it is known from the dictionary meaning of the code. 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. 8 for Ignition System or Misfire. 4 for BBV Sensor Circuit Low Voltage and 6 for Cruise Control System – Vehicle Accel Too High.