New to the forum, my fix may not be for everyone but here is what has been the fix for me (as of now).
I started getting park sense unavailable which then progressed to service shifter, then progressed to getting both notices along with a check engine light. Downloaded a U001 which is a High Speed CAN Communication Bus error.
Replaced my Park Assist Module, ordered one directly through MOPAR and didn’t require a reprogram. But the problem stayed the same.
I checked the RF Module behind my back seat with no defect, checked all my fuses, checked all grounds running along the left side of the truck, had battery tested, checked alternator output, and could find nothing that would cause it to happen.
Two days ago I had the errors pop up, then decided to use it to my advantage and feel for harnesses that may cause it to go in and out. Pull my light assembly panel left of the steering wheel and grabbed the wires going to the star connector that’s mounted on the drivers side. I was able to get the service shifter to come on when moving the wires to the star connector.
I then bought a new star connector (Can Bus Connector) PN:68321746AA paid $86. Swapped it out and have not had the errors come back yet. I am an aircraft mechanic but this part was extremely easy to replace and can save hundreds rather than taking it to a dealership.
I will post an update if the errors come back, but for now everything is good!