The genuine meaning of the B2581 Code is real meaning and it is connected with the manufacturer of the car. The general meaning of the code is not necessary for solving the car engine problem. The engine system, in conjunction with the engine control module or powertrain control module (PCM), triggers the B2581 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to switch valve timing between Little and High. If the engine solenoid valve has an open or dumpy circuit, a DTC is stored. Body of the car engine is easy to fix.