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The 11 and early 12 Duramax actually had bad NOX Sensors. The was a letter from GM, but it seems not everyone got it, as I know I didn't but was getting the "Poor DEF Quality" message. Finally got the local dealer to replace them and haven't had an issue since.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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