My 3.0l engine failed at 5,403 miles. It just stopped running while accelerating away from a roundabout. No warning, no dash lights. Just quit and I coasted to a stop. I had steering. A message popped up on the screen that read "please restart engine" or something like that. It wouldn't and it was towed to the dealership. They determined it siezed. GM didn't pay for them to tear it down, just immediately approved a new engine. I doubt I'll ever find out what failed. It took 50 days to get the truck back. I have 300 miles on the truck since and it's running just fine. Fingers crossed it was a fluke.