The engine P2584 Code has many meanings but you always look for the right meaning of the code. The automobile dictionary meaning of the code is not fully right meaning of the code but it can be used for solving the car engine. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 5 for Computer And Auxiliary Outputs. 8 for Exhaust Gas Recirculation System Valve 1 and 4 for Cruise Vehicle Speed/Set Speed Difference Too High. This automobile dictionary meaning of the code is found online.