To diagnose the P0025 Toyota code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Nearby car dealerships When is the Code Detected? After the ECM sends the target duty cycle signal to the OCV, the ECM monitors the OCV current to establish an actual duty cycle. Dirty Oil Variable Valve Timing (VVT) circuit is open or shorted Oil Control Valve (OCV) circuit is open or shorted Faulty variable valve timing (VVT) Faulty oil control valve (OCV) Damaged Engine Control Module (ECM). The ECM determines the existence of a malfunction and sets the DTC when the actual duty cycle ratio varies from the target duty cycle ratio. What are Code Possible Symptoms? Engine Light ON (or Service Engine Soon Warning Light) Lack/Loss of power Engine rough idle Code P0025 Toyota Description The Engine Control Module (ECM) controls the Oil Control Valve (OCV) to regulate the intake camshaft angle. As a result of the angle change, the engine timing is advance or retard. Optimizing engine timing will help the engine improve torque and fuel economy, and the exhaust emissions decrease under overall driving conditions. The Variable Valve Timing (VVT) system includes the Oil Control Valve (OCV) and VVT controller. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control.