The B1593 Code has different meanings for every car and for your car, the code has one meaning. To get the accurate meaning of the code, reading the manual of the car is necessary along with knowing the manufacturer name and model number of the car is also important thing what you cannot ignore. 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. 5 for Computer and Auxiliary Outputs. 9 for Crankshaft Position Sensor Circuit Performance and 3 for Transmission Control Module Reprogrammable Memory.