sensor is ***ed up.. thats a issue that happens.. mine did the same thing 3 weeks ago. got pissed.. no idea how the sensors are even used in the tank.. i read a post on google saying hit with a hammer to possibly get it unstuck.. so i did.. 10 min later code was gone... top it off with def/water, hit it with a hammer and see.. unless its still under warranty and you want to drop it off..
fwiw, that was the final straw for me. its getting deleted end of this week.. the issues our trucks have are related to the emissions 99% of the time.. i drive through canada to go to work and back so i dont want to be stranded in another country if this **** happens again..
live life full throttle