ABS light dealer couldn’t solve

2011 ram 2500 5.7 4x4

After the truck sat for two weeks next time I started it up check engine light, abs light, parking brake light all came on even without parking brake on. Trailer brake controller also freaking out flashing exclamation mark and on the dash saying trailer brake disconnected. Main code that comes up is U0121 lost connection with abs module. Zero communication with abs at all if I try to go into abs in JScan app it says no module installed. Thought maybe a wiring problem, power and ground pins at the connector were both good and resistance between communication lines was 60 ohms. She taking the connector off it snapped off the lock down tab, can still be pushed down tight but no locking tab. Thought maybe a bad module replaced it with one from eBay. And same result. Thought maybe brake controller was bad and interfering with it. With brake controller unplugged still same issue. Took it into dodge dealership and they spent a whole day working on it and said they couldn’t figure out what was causing it they confirmed all the pins at the connector where working properly and they get zero communication with the original and new (used) module. Their best guess was I was unlocked and both modules are bad. They said molar no longer makes the part and they couldn’t source one even if they wanted. Today I just went to pick and pull and got another module from an exact 2011 ram 2500 4x4 and still zero communication, won’t even come online in the app to be able to reprogram the vin. If I try it just says module not installed. Completely at a loss.