The meaning of the B1890 Code is found from the dictionary meaning but you need to know the real meaning of the code what is associated with the manufacturer of the car and model. This code describes about the problem of the engine and basic meaning of the code does not help you a lot. You need to know the dictionary for getting the basic idea about the problem of the engine. The code B1890 is started with the alphabet B and it means that body of the engine has main problem. However, as the body of the engine has the problem and it is easy to fix.