I have a 2013 GMC Sierra, purchased new in 2012, has approximately 35,000 miles. The check engine light came on while driving and suddenly another light came on. Then a third light came on claiming poor engine fluid quality. I immediately stopped at an auto parts store and put DEF fluid in the pickup and continued to drive thinking the lights would go out, but instead a warning was flashing on the dash that says after so many miles the truck will be slowed down. We started getting nervous because we were driving on the highway and if the truck suddenly slows down whilst driving in highspeed traffic, our slower vehicle would potentially cause a collision and put us and others in harms way. In reading your own safety site, there is a recall on the vehicle regarding faulty airbags, so it could be even worse! In our investigations of our current issue, we have found that there was a lawsuit from 2019 against GM and their faulty fuel system with their trucks. See link here https://www.detroitnews.com/story/business/autos/general-motors/2019/08/07/lawsuit-says-gm-sold-trucks-not-compatible-american-diesel-fuel/1943084001/ many people on many different forums have also complained about this same problem with no fixes, the only suggestions are to remove the emissions parts and refab the motor. GM tells them that they need to only use their specific DEF fluid, which is steering. GM is very well aware of the problems, because they have employees following these forums and commenting on them.(Dieselplace.com) The truck can be made available for you to see/inspect and I refuse to drive the truck until this issue is resolved.

- Dryden, VA, USA