My 2011 duramax had def and particulate filter problems. All fixed under warranty. The problems would have left me in hot water had I been on the road. The truck was fantastic as a hauler but I did trade off after warranty because of the possible issues. My big beef with these systems is how they can literally shut you down a thousand miles from home. When they could run just fine until home where they could be repaired by your own mechanic. That could get expensive while out of warranty and at the mercy of any dealership. JMHO