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New here but having some trouble with my 2012 duramax. It's about to hit 100k mile. Last month, May, it threw P2200, P2201, P2202 codes and the display said "service emissions system now". I replaced the NoX sensor 1, took it to the dealer, they preformed the regen and said the truck was good to go. About 2 weeks later, less than one tank of diesel through the tank the CEL is back on. Check with my scanner and it's showing codes P2201 and P229F. Called the dealer and they said no warranty and would charge full price just to run a check.
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Does anyone have insight on fixing these codes themselves?
 

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I wouldn't go back to that dealer for sure. Sorry, but I don't have any insight into the actual problem or the fix.
 
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