19 JLU with communication issues

[Millissa]

My JLU after starting it a few weeks ago came across with key fob has left the vehicle. Immediately after all dash lights came on.
I get it to my destination and when I restarted all lights were on and it would not come out of park.
the dealership is at a loss and just told me they can replace the BCM and ECM but they can’t be sure that’s the issue.
Replaced already is Keyfob battery, cam bus, main battery and accessories battery.
Any help or suggestions is appreciated

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[roaniecowpony]

Yeah, it shows they don't really know.

This might help understand the architecture.
(1) Jeep JL Wrangler Wiring Diagrams | Jeep Wrangler Forums (JL / JLU) -- Rubicon, 4xe, 392, Sahara, Sport - JLwranglerforums.com

 

[Millissa]

My JLU after starting it a few weeks ago came across with key fob has left the vehicle. Immediately after all dash lights came on.
I get it to my destination and when I restarted all lights were on and it would not come out of park.
the dealership is at a loss and just told me they can replace the BCM and ECM but they can’t be sure that’s the issue.
Replaced already is Keyfob battery, cam bus, main battery and accessories battery.
Any help or suggestions is appreciated

UPDATE: Jeep is still at a shop. The dealer could not identify the issue. I ended up at a local 4x4 shop that works on mostly jeeps. They have gone through the entire wiring on the jeep, dash out, center console out, checked all modules, fuses, put in a new PDC and still the same issue.
Next step remove computer and send it off for testing/repairs. 4 weeks no jeep, no solutions!

 

[2019JWUR]

UPDATE: Jeep is still at a shop. The dealer could not identify the issue. I ended up at a local 4x4 shop that works on mostly jeeps. They have gone through the entire wiring on the jeep, dash out, center console out, checked all modules, fuses, put in a new PDC and still the same issue.
Next step remove computer and send it off for testing/repairs. 4 weeks no jeep, no solutions!

Did you ever get a solution to our problem? My jeep is currently doing (has same symtoms) same thing??

 

[Millissa]

It was an ABS break sensor under the passenger fender that corroded and caused all the complications. Three months four garages to finally get an answer. Been running great since no problems.

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