Databus communication issue

I have the same issues... Dealer says it is the ICU

 

What you have to do, my 2015 Coronado does the same after wash/ rain

 

I'll ad to the list.
2015 Coronado, dd16, manual. Driving through rain, same display, to include once the truck can set for several hours in the dry, the alarm will start to slowly stutter on and off, then off.
Next day, key on, the ecm goes through it's self test, and it starts and drives no issues.
Then,.......go through this whole scenario once again, but middle of night, start the diesel bunk heater, Whole other set of red lights and alarm go off. Shut down heater, no effect. Turn off batteries and let sit for several cold hours, then back to normal.

Definitely a moisture issue, but hoping to learn the main place to start and go from there.

 

The problem every one of you is having is water intrusion in the b-pillar on the driver side. The PDM and ABS computers are in the compartment beside the driver seat. The PDM is the culprit. Replace it and all of its fuses and/or relays. Use some kind of thin rubber material to cover it for protection against water.

 

So my issue ended up being water infiltration into the aftertreatment control module. It is located directly behind the driver's steer tire.
I learned the new modules from the factory are made in USA, vs. Mexico. So I took my vin and ordered the new module, installed it myself, and then took the truck to the dealer for synchronization with the other modules. Been 100% since.