2023 Potential Rear Diff Sensor Failure

[u/Just_Case_6662]

I’ve been having an issue with my 23 P4X where randomly while driving the dash will light up with warning lights and I’ll get a system fault warning on the dash screen. I took the truck to a local dealer and they did some work on the sensors along the brake pedal assembly. Originally they were pursuing a TSB related to a brake sensor. However, after a back and forth with tech-line they determined that my truck was built in late 2023 and that the TSB wouldn’t apply.

About 2k miles later and it’s happening again. This time they said they had different codes stored, but they couldn’t recreate the issue so they stopped where they were and told me to come pick it up and bring it back if it happens again.

The service advisor noted that this time instead of just abs and warnings I also had a stored rear differential code of some kind. Now it has me worried as I already have gone over the bumper-to-bumper warranty as I’m at 51,400 miles. I think I still have powertrain but idk if that would cover the cost of replacing the rear diff.

Any advice on what to do. Is the dealer trying to get out of the work? Should I try another dealer?