The meaning of the B1584 Code is necessary to know for solving the problem as soon as possible. The dictionary meaning of the code is necessary to know. For this code, the dictionary meaning is B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 5 for Computer and Auxiliary Outputs. 8 for Exhaust Gas Recirculation System Valve one. 4 for Cruise Vehicle Speed or Set Speed Difference Too High. Now you can understand that body of engine has the main problem and it is necessary to solve as soon as possible.