2011 was the first year of the LML platform. When they first came out, they were having a lot of dosing issues with the SCR system. With that many miles, I would be willing to bet that at one point it has made it back to the dealer to be updated. The other thing about the LML is the high pressure fuel pump they used, and are still using. They are a Bosch CP4. They have been known to completely explode internally and send hard parts all through the fuel system. I have heard that it costs somewhere in the 12k range to replace all of the fuel system. It is not very common, but it does happen.
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2007 Chevy Duramax EFI Live and other supporting mods.
2015 Wildcat Maxx T26BHS
Nights camped 2015....23