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Have you made sure a trailer didn't accidentally get added? If so, delete the trailers and see if that helps
Have you connected any lighting to the trailer harness?
This will happen if a trailer is selected. To deselect the trailer follow this:
-Put truck in accessory mode, (start button with no brake pedal)
-using the steering wheel arrows, go to trailer tab , and then down to “trailer set up”
Choose “change trailer selected” and then switch it to “no trailer connected”
That should fix it for you!!
If you haven’t added any lights or tapped into any wiring then it maybe an electrical issue I would take to dealer
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