The general meaning of the B2500 Code is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 2 for MFG – Manufacturer Specific. 5 for Computer And Auxiliary Outputs. 0 for IC Circuit High Voltage and 0 for Transmission Engaged At High Throttle Angle. The B2500 engine code is a kind of body problem. The main multi-displacement system twisted off opposite pairs of cylinders, allowing the engine to have three diverse configurations and movements. The B2500 code had an extravagant diagnostics process, including showing engine trouble codes on the air conditioning display. However, the system was misunderstood by users, and a rash of random failures led to the technology being fast discharged.