awesome, hope that works. I think I had that done already. The one thing I found out about this truck is that most of the issues
suspension(airbags) and DEF SENSOR and a bunch of other stuff you can figure out yourself, the truck almost always resets itself.
you'll also save a ton of money...
I have the same model as you and the same problem., finally figured out that I had way to much DEF in the tank, the tank wouldnt read it correctly, i drained the tank, which is pretty easy with a small hand pump,
drain the fluid back into a empty DEF container, make sure you drain the tank...