The meaning of the C1233 Code is helpful but it is necessary to find the real meaning of the car engine. Do not drive any unnecessary meaning of the code for solving the car engine problem. You should rely on the right meaning and that must be associated. The engine system, in conjunction with the engine control module or powertrain control module, activates the engine C1233 code solenoid valve to regulator oil compression to the engine instrument that is associated in the valve system to change valve timing between Low and High. If the engine solenoid valve has an short circuit, a DTC is stored.