I have an 02 2500HD Dmax. I love the truck, but have had some major problems with it, all of which have been taken care of under warranty to this point. Included in those was injectors at 66k and a new motor at 80k. Well, recently the truck began experiencing some of the signs of injector failure again, SES light code P1093, hard starting, slightly down on power. I took it back to Champion Chevrolet here in Houston, where so far they have been extremely good to me, and told him the symptoms and had them diagnose it. As always, I didnt let on that I know a little about the trucks and that I thought it might be the injectors. Well, 2 days later, the service writer tells me they looked at it and the tech is recommending a differential fluid change!! I asked him how the hell that would set a code and what code did they get from the SES light check. The stupid MF just studderd and said, "you have a scan 2 tool?" I said yes I do and asked him to explain how that code is related to the differential. Needless to say, he had to go back and talk to the tech. What an MF'n joke.