If you have this problem, be prepared to advocate for yourself. I'm having a similar issue, or maybe the same one on my 2013 Silverado 5.3. At about 60K the oil pressure dropped to near zero. The local dealer replaced the oil pump under warranty and said that was unusual but not unheard of. At 90K, same thing. The dealer (a different one, because we had moved) replaced the oil pump (also under warranty) and said they didn't see a reason for the second pump to fail. I asked about the screen, bypass, etc., and they said it was all fine, and that they didn't see anything else wrong, but that if the problem returned we'd be covered. Now at 97K the same thing has happened, but this time they say there's a cam bearing issue causing the pumps to fail and that GM won't cover the repair under warranty because we're 62 months into ownership and this is a different problem. This truck has had excellent care since new, has never been used to tow, and gets mainly highway miles. It's really frustrating that GM won't cover the problem even though it first appeared well within the warranty period. So, if you have this issue, be prepared to be really insistent about finding the root cause when it's under warranty, because if they can get the truck out of the warranty period, you're on your own. Thanks for nothing, GM. We've purchased more than 10 new GM vehicles over the years, but it looks like my next new truck will be a Ford.
