mvf969

I had the same issue in my 2023 High Country it sounded like I was chased by the rattle. I thought it was the seat or the belts but it turned out to be the cabin pressure vents. Apparently there are rear pressure relief vents in the back of the cab behind the seat. They are supposed to be glued in and mine were not so they just rattled. My dealer found them after they took out the rear seat and the rattle was still there. It took them a couple of days but four months later no rattle. If you are curious my Silverado was assembled in Mexico and mine was the first but they have two more from the same assembly plant with this issue. I hope this might help.

I installed the Auto Stop eliminator. It turns the feature off and allows you to turn it back on if you want. It basically makes the default position off instead on. It does require minor dash disassembly and plugs into the factory harness. The kit cost $99 and I had a local audio shop install it for $100. Since about 70% of driving is in town it totally transformed the driving experience.

I had a 17 cc z71 5.3 and had an almost indentical problem and it would go to the dealership and then come back and a few days later it would happen again. It turned out the active grill shutters were binding. If the temp dropped overnight they would get stuck and every problem you had I had. It took that long because it was getting down into the 40s and night and by mid morning the temp was already in the mid 60s