Just happened to us. 14xxx kms, just past the one year mark. Want to try to sell us on the rebuild. No thanks. But waiting for another 6.2 may take six months or more. Our 2012 with a 5.3 was at 359000 km when we sold it, nothing but a little oil consumption in 12 years. Sold it because I was worried about reliability. Ordered a 2022 Yukon Xl, waited almost a year to end up in a 2023 that they couldn't honor the price or financing. Everything about this has been a run around and now I don't even have it. Buyback isn't an option because now that truck is $20k more. I have been brand loyal most of my life, but this may change that.