Have concerns, just bought used 2011 Chevy 3500HD. LOVE the truck! My assumptions are it had a goose neck hitch installed, and 67,000 miles. On the XM radio, it had some Canada stations, so I think it was a hotshot truck. I am now getting "Diesel exhaust quality poor" on the dash. Second time. First was three days after purchase, and again five weeks after purchase. Dealer is still responsible, as we purchased an extended warrantee.
Question I have is, what can be done about it? or is it some sort of Lemon????