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same issue here with the trailer light test and the gauge screen. Worked taking my trailer to the camp site, but a week later it does not. I might try the radio reset, as others have done.
I'm also having this same issue. I would bring up the gauge page as I was driving around, from time to time, and each time I did this, the gauge screen worked fine. The Sunday before Labor Day weekend, the trailer test, was my first towing with this truck, the trailer light test worked fine...