Oil pump or sending unit?

Common problem. There is a basket looking screen under the Oil Pressure Sending Unit that will get gummed up. Just need to take out the Oil Pressure Sending Unit on the back of the engine, fish out the screen and clean it. Since you have gone threw the trouble of taking out the OPSU. should just replace it. When the screen gets gummed up, the gauge on the dash will read inaccurately.

Yes, probably that sending unit. The first thing that makes noise on an engine like that with low oil pressure is the lifters. But if I went to the effort to remove that sending unit to clean it, I would just put in a new one, because it is a very inexpensive part. With that sending unit removed you can also hook up a gauge to get the actual oil pressure. We spend all this money on cars, and all we get is idiot lights. There should be a law! Good luck.

Before checking the oil pressure, that screen would need to come out first, as I said, it is under the Oil Pressure Sending Unit.

Would this also apply to the 2013 BD Avalanche?