The engine C1861 Code is helpful and getting real information is found from the car engine manufacturer. If the right meaning of the code is followed, the car engineer may get some new annoying car engine problem. Due to some reasons, the engine code may appear on the engine code reader screen. The C1861 engine code is a kind of chassis problem and this problem is not difficult to solve. The engine system powertrain control module, starts the C1861 engine code solenoid valve to control oil compression to the engine mechanism that is connected in the valve system to shift valve timing between Low and High. If the engine solenoid regulate has an open or short circuit, a DTC is stored.