The car engine P1186 Code comes due to the problem of the car engine. The engine scheme, in conjunction with the engine control module (ECM) or powertrain control module (PCM), starts the P1186 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to change valve timing between High and Low. If the engine solenoid controller has an open or short circuit, a DTC is stored. The car engine should be solved properly by the accurate meaning of the code. You have to solve the car engine properly and you need to relay on real meaning of the code and get help from an expert automobile engineer.