One problem related to check engine light on has been reported for the 2016 GMC Sierra. The most recently reported issues are listed below.
My 2016 GMC Sierra 3500 diesel denali has been in the shop 5 times and over 50 days since November 4, 2017 for an emissions issue. On November 4 while driving, I received a check engine light that said to service the exhaust system and a countdown started, reducing the speed of the vehicle by 10 mph after every 50-75 miles . The vehicle had about 38,700 miles at the time. The error message that the dealership received was p205b reductant tank temperature sensor performance. They replaced the emission reduction tank reservoir and completed a regeneration test. On December 11 I got the same message and they received a reductant heater control circuit low error and they replaced glow plug control module. On January 2 I got the same message and the dealership replaced the emission reduction fluid supply pump module. On January 17 I got the same error and they replaced replaced the reduction fluid supply pump module again. I got the same service exhaust system error and took the truck back to the dealership on February 10. It is now February 27 and they have not identified the problem. There appears to be an issue with either the emissions system or the computer that runs the system, but no one can say for sure.
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