Haid0041

I just purchased a 2021 Sierra, 6.2L. Same noise. Frustrating to see this thread without a solution. I've had it to the dealer twice and told they couldn't hear it, only to hear it at ever stop on the way home. I'm going to try another GMC dealership... i'm hoping this is corrected. Embarrassing and frustrating to hear on a brand new truck. I'll post if anything is resolved.