Replying here in case someone else gets the code.
Pressured up my exhaust and found a leak at the driver's side header clamp (the one between the header and connection pipe). Removed the clamp and reinstalled it with Permatex 80335 Muffler and Tailpipe Sealer and the code is gone.
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2019 GMC Sierra 1500 AT4
Summit White
6" Lift, 37x13.50R24's
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