Mine does the same when cold, usually once and then it stops. The transmission in my truck hasn't been touched so I'm thinking it's normal. I had a 2019 f150 before this one and it would do the exact same thing.
I've noticed mine running a bit rough when it's doing a regen, almost like the timing is slightly off and sometimes the idle rpm will jump up and down. It all goes away after it's done with the regen though.
Seeing as my truck looks exactly like yours you could also use some spray on bedliner across the rockers and the lower 3" or so of the bottom of the body panels. The black is barely noticeable on that dark blue and works well to cover up the chips.
I've had a set of Weathertech and Husky flaps on 2 different trucks, the Weathertech are longer and kept more dirt and chips off the truck than the Husky because of the length. Even with the Husky flaps I have now I still get dirt and mud flung up hitting under the drivers door and into the rear quarter panel just ahead of the bumper.
I don't see many posts about changing or upgrading the media receiver/radio in these trucks. I have a 2022 Custom with the 7" receiver and really dislike how Google or Android Auto blocks incoming texts and the back up camera is nothing to get excited about either. Would an upgrade fix these issues? What about access to the vehicle settings that are done through the radio/screen?
Copied this from Google The ECM detects that the voltage on the fuel economy mode switch signal wire is either too low or too high out of range. The P159F code is probably due to the low battery situation; it will be set on many recent GM models when voltage to the mode control switch (tour/sport/weather in the ATS) drops too low.
That's why I'm asking if it's serious enough to take it out of service, there's millions of vehicles on the road with oil leaks of some form or another. If the truck goes down I'm out of business until it's fixed.