2006 Silverado 4.8 Low Oil Pressure

One thing to check is there may be a screen under the oil pressure sending unit that is plugged up, common problem. But they started that in 2007. If your truck was made later in the year in 2006, it is possible there may be one in that engine. It is just a matter of taking out the oil pressure sending unit and fishing out the screen. Replace it or clean it. If there is one in there you would have to ask for 2007 on years at the parts store.

Thank you I'll check that