Jacob Capra

Look up muffler delete on YouTube for the Trailboss, could save you some coin.

I have had the same issue with my 2021 6.2 trailboss while in auto mode. It goes away in 2WD, so I plan on taking it to the dealer when I have a chance. I'll let you know what I find out. Respond to this thread if you figure something out before I do.

This is a good video to show what the muffler delete can do. Don't order the AFE, I'm actually getting mine done in a week by a local exhaust shop for $75, plus it will be welded in, so no issues with leaking like you'll see in the video. If you do that, just make sure they cut out that flapper valve!