The car engine is important thing and do not drive the car when it is problematic. The car engine is tested by the engine code reader and the car engine P1125 Code comes from the car engine. The engine system, in conjunction with the engine control module or powertrain control module (PCM), starts the engine P1125 code solenoid valve to switch oil compression to the engine mechanism that is installed in the valve system to change regulator timing between Low and High. If the engine solenoid regulator has an short or open circuit, a DTC is stored. A test drive is recommended after solving the car engine.