as mentioned above the picture does not look bad-my brother has a 2013 6.2 had the exact same thing happen no power limp mode, drive it home five miles on limp mode, we pulled valve cover and found a broken valve spring, replaced it and everything is fine. if you pull cover and the valve spring was still there but broke, maybe like his the valve did not touch piston. in other words if the valve did not hit the piston probably fine. his was right at 70k when it happened now has 85k