The engine P1143 Code lets us know about the car engine problem and location of the problem. The car engine problem can fixed easily and it is important to fix the car engine soon. The automobile dictionary meaning of the code is found online. The engine system, in conjunction with the engine control module (ECM) or powertrain control module (PCM), starts the engine P1143 code solenoid regulator to regulate oil pressure to the engine mechanism that is connected in the valve system to switch valve timing between Low and High. If the engine solenoid controller has a short and open circuit, a DTC is stored.