Update: The total bill is about 1600 bucks, with them claiming it needs a new Rotor. This after only about 108 hours of use. No way around it. Yes, I can buy a Honda for a grand, but I'd still owe them the 600 bucks for the diagnostics etc, and then I'd have a non working 2500 watt generator to take to the dump. I even spoke with the Cummins corporate and the local Cummins/Onan factory rep. No help. Next time I'm going to order the camper without the generator and just go Honda or something right from the start. Really a shame.