2022 Chevy Z71 Suburban 6.2L same thing happened to me at 19,000 miles. Wife baby's the vehicle. Woke up to move her car and had a sudden low engine knock. Had it towed to a deal and Chevy did a long block replacement with a remanufactured 6.2L. It runs fine for now. They had it for 3-4 weeks. Dealership was great but this whole thing sucks as I have read that some folks have had it happen twice on the same vehicle. Still under warranty and I didn't pay a dime. Just not having a warm and fuzzy about driving it out of town anymore.