The function of camshaft is to control the opening and closing of valves. In the variable valve timing system, the electronic camshaft control valve (or oil control valve, OCV) adjusts the angle of the camshaft by changing the oil pressure of the camshaft adjuster (mechanical) according to the instruction of the engine control module (ECM) to ensure that the valve opens and closes at the best time.

The failure causes of P000B include exhaust/right/rear camshaft regulating valve (oil control valve), its circuit, connector, dirty oil or ECU.

After the automobile fault is eliminated, the fault code needs to be cleared.

When clearing the code, it must be carried out in strict accordance with the fault code clearing method specified by the specific vehicle model, and it is not allowed to be cleared at will by removing the negative connection of the battery.