The basic meaning of B2158 Code helps to identify the general meaning and the dictionary meaning of the code is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 2 for MFG – Manufacturer Specific. 1 for Transmission. 5 for TP Sensor Learn Not Complete and 8 for PCM Stack Overrun. It is not important thing for solving the problem from the car engine. The real meaning of the code is related with the brand of the car and car model number. If you do not know the brand and model number of the car, it is not possible to get the actual meaning of the code.