Yes, low oil pressure is one of the primary causes of lifter noise. This occurs when there isn't enough pressure in the system for the lifters to pump up correctly and provide adequate lubrication to the valvetrain components. The low oil pressure will cause a loud ticking or knocking sound that is usually more noticeable when the engine is idling. If the oil pressure is too low, it can also lead to further damage to other components such as valves, camshafts, and connecting rods.