The B1598 Code has dictionary meaning and the dictionary meaning 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. 8 for PCM Stack Overrun. The dictionary meaning of the code is not enough for solving the problem. The same code has different meanings based on the manufacturer and model number. Reading the manual is also important thing. For the B of the code, it is understood that the problem of the engine is related with the body of engine.