The dictionary meaning of the B2590 Code is not helpful and it is easy to get from online. 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. 5 for Computer And Auxiliary Outputs. 9 for Crankshaft Position Sensor Circuit Performance and 0 for Transmission Engaged At High Throttle Angle. You can read this meaning of the code for solving the car engine but you should not use this code for solving the car engine problem. You need to get the actual meaning of the code according to your car manufacturer.