2017 f250xl 4x4 with the 6.2L gas engine. Received multiple fault messages and warning lights on my dash. Trailer brake module fault, check 4x4, service advance trac, hill start assist and one or two others. No clue where to even start with this

 

Likely a bad battery, get it load tested.
These trucks are super sensitive to battery issues.

 

I just posted this in another thread. Take every electrical connector you can find in the rear of the truck apart and clean them. Apply some dielectric grease and reassemble. These connectors get water in them and cause all kinds of electrical gremlins. Good luck.

 

especially the large connector mounted on the inside frame adjacent to the spare tire ..n the pax side. Ford doesn’t use sealed wire ends so wires going into connectors can get wet and short out. Spray dielectric grease works the best for wires going into connectors and female pin holes.. Type type dielectric tric grease is fine for the pins.

 

 

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Check and clean your trailer plugs as well. Check taillights for water intrusion. Pull up your door sill trim and check for water intrusion. Also wheel/ABS sensors have been know to cause this. And the connections already mentioned. If it’s not that simple get ready to start tracing wires.