The B1933 Code is related with the vehicle engine and it has general meaning but you need to get the real meaning of the code solving the engine problem. The dictionary meaning of the code is general meaning. The engine system, in conjunction with the engine control module or powertrain control module, starts the B1933 code solenoid valve to control oil compression to the engine mechanism that is installed in the valve system to switch valve timing between High and LOW. If the engine solenoid valve has a short circuit, a DTC is stored. You need to fix the problem by the expert automobile engineer.