The B1945 Code can be explained by the automobile dictionary and meaning of the code helps to get more information for solving the car engine problem. The dictionary meaning provides only general information of the car engine and that is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 9 for Fuel and Air Metering. 4 for BBV Sensor Circuit Low Voltage. 5 for Park/Neutral Position (PNP) Switch Circuit Engine Torque Signal Circuit. You cannot skip the general meaning of the code to know the general meaning of the code.