Okay, so let me throw this one at y'all. My 2016 Chevy 2500HD Dmax had the steering wondering issue shortly after I purchased the truck back in late 2016/early 2017. I took it back to the dealer and they performed the TSB for the pit-man arm slack adjustment. To be quite honest, it really didn't seem to make much difference. However, I know the wondering issue in the steering can sometimes be highly subjective even to myself. I mean, I can hold my lane on the highway with the truck no problem. But then again, I am used to driving a 36ft Diesel pusher motor home. So what might seem fine to me might seem excessive to others. I have learned that when I put the truck into tow-haul mode, that would automatically stiffen the steering which sometimes I did whether or not I was pulling a trailer or the boat just to feel the difference in the steering wheel. Now fast forward to today. While driving the truck today, I was backing out of a parking spot, the steering wheel was as easy to turn as grandma's prius. (which BTY is, in fact, what GM wanted to accomplish with the digital assisted steering) Then all of a sudden it felt like the steering went back to what I call the "stiffer" mode all by itself. There are no DTC's, after several engine restarts and ignition cycles and turning off and on tow/haul mode, still the same thing, stiff steering. Now, it is kind of ironic because I actually LIKE the stiffer feel to the steering wheel. While driving in a straight line it also just makes the truck seem like it wants to track better. However, when in the turns, you know it takes a little more effort to do so. Us big armed guys have been spoiled by it! But as with everything now it leaves me worrying about my Chevy again. I hate going to the dealer. But I know this might be a necessary eval again! Has anyone else experienced this same issue yet???