The B2593 Code is related with the engine and it has several meanings. An automobile needs to get the actual meaning of the code what is related with the car engine. This code is not found online and the automobile engineer needs to study the genuine meaning. Read the manual to get the real meaning of the code. However, you should not try to solve the engine problem if you have no all necessary information. You should get the real meaning of the code and you will get those meaning from the car engine manual. Test the car after solving the problem.