Whats up my Duramax pals., SO today I received a letter from gm stating if you own a 2016 GMC Duramax I believe this applies for 14-17 Chevys 2500, 3500 Duramax models also. This letter was intended to make you aware 2016 GMC Sierra models have a condition which causes an offset in temperature sensor in diesel emissions reduction fluid (DEF) tank reservoir or causes def heater performance to degrade. IF this occurs the Check Engine light will illuminate the "service Exhaust fluid system or "Service Emissson System Message will be displayed, and a diagnostics trouble code related to the condition will be set. (THATS FROM THE LETTER FROM GM) MY TRUCK HADE THIS EXACT PROBLEM AT 24000 MILES,SO I STRAIGHT PIPED IT. So now I can get a new whole exhaust and DEF system for my truck would display these exact codes. So anyone with a 2016 GMC Duramax you can call 1800-462-8782 customer assistance Center. They also are REIMBURSEMNET REQUEST FORMS I GOT ALSO!!! SO TAKE ADAVANTAGE MY FELLOW DURAMAX PALS.:grin2: