The engine C1877 Code is a short information of the car engine problem and if the real meaning of code is found, do not try to fix the car engine. It is recommended to get help from professional. The engine system, in unification with the engine control module (ECM) or powertrain control module (PCM), activates the engine C1877 code solenoid valve to regulate oil compression to the engine mechanism that is installed in the valve system to change valve timing between Low and High. If the engine solenoid valve has an open or short circuit, a DTC is stored. Test the car is necessary to identify the problem.