Want to followup to my Jan 6th post. As expected, the issue was indeed failed lifters and a bent rod. Dealership replaced only one bank of lifters since mileage was over 6k or 8k (can't remember the threshold).
Waiting game for the remaining lifters to fail.... :thumbsdown:
Long time lurker on a few Suburban/Tahoe/Yukon forums with both a 2021 Suburban HC and a 2022 Suburban RST.
I had hoped for a very long time that the lifter issue wouldn't affect me, but alas my 2021 just joined the failed lifter club. Truck was purchased new in April 2021 (w/ 28 miles on it)...
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