I traveled a lot in my previous job with my LML. Without my truck i would not be able to work. Here were my problems....
Went to the dealer 2 times down in New Orleans They told me the first time that they had to reset the codes. It came back on with thin hours of leaving the dealership. Brought it back and they replaced the tank and the sensor. That lasted a couple weeks before DEF message came back on.
Brought it back in again this time to a dealership in Franklin IN and they told me that they had to go and replace several sensors and the tank!!!(beyond my knowledge of comprehension to why) So far it has been 1 year without any problems. I am currently sitting at 66,000 miles and can not wait until my warranty ends to take off all the emissions stuff!
2011 GMC Sierra 2500 Deisel-Stock-Go Rhino Spray in Liner-285/65/18 Nitto Terra Grapplers- Skyjacker Leveling kit- AFE air-intake