I'm sorry James, I forgot to mention that. The Cummins in 3/4 and 1 ton pickup trucks do not run the DEF. I'm sure there are plenty of C&C Ram's and Ford's that are running in the cold temps.
If the heater for the DEF isn't somehow tied into the block heater cord, then GM (and any other manufacter for that matter) have a HUGE problem on their hands. I don't care how many re-flashes you do the truck, it ain't going to help. Are the Super Duty's and Rams having the same issues with the...
The 3 Dmax's I had all were just known as a female, no specific name. But when I bought my Cummins, I had a name for her within a couple days of bringing her home. It's a RAM, so her name is Rachel Ann Marie.
So Mechanic, I see you are a mechanic for Rusty Wallace Racing... Do you travel to the tracks with the team every weekend or do you stay back at the shop? What area of the car do you specialize on?