That's great info @Nutt .
You should have done a write up and documented it for us :D. I have a feeling you won't be the last guy to have this problem.
Welcome!
Sorry to hear of the troubles. These trucks are no different from others, they all break. Sometimes we just get unlucky.. I wouldn't let this repair steer you away from the platform. If you like it, and still enjoy the truck just drive it and be happy.
Here is a post with that location: http://www.ecodieselram.com/forum/threads/engine-block-heater.407/#post-2438
Also, if yours doesn't have it. You can buy it on Amazon. Link is in that thread.
Before going the delete route, I would have the issue taken care of first(as long as you're under warranty). Then go the delete route.. it would be bad if the delete for some reason didn't take care of the trouble code.
I posted it here: http://www.ecodieselram.com/forum/threads/tsb-18-078-16-engine-oil-viscosity-upgrade-and-flash-enhancements.1178/
I actually had the copy and forgot to update the TSB section.