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It's the active noise canceling system. Have your dealer update it..as for the squealing brakes, there is a service bulletin on that too. I had the same problem and my dealership installed some type of brake moan kit on the rear brakes. They have been quiet since.

I had them update the anc system..I'm 90 percent sure that is where the noise was coming from. Hasn't made the noise since the update so hopefully that issue has been resolved

They looked at my truck in their shop the other day and still couldn't figure out what it was. This was after I took a tech for a drive and he definitely heard the noise. They said they couldn't recreate the noise and everything was operating as designed at this point. Did you ever find out what...

He didn't know what it was..I already brought it in once for this issue and they couldn't recreate the noise..like I said it happens randomly and goes away if you shut the truck off and restart it...of course they didn't have time to look at the truck in their shop the day I stopped in and took...

Nope. Sounds like it's coming from right underneath the truck

So I have a big horn quad cab with 8k miles on it. About a month ago it makes this groaning noise that changes pitch with the speed...lower pitch when slow, higher pitch when going faster. It has done this several more times randomly. When I shut the truck off and restart it the noise goes...