Welcome. I haven’t experienced your issue but it sounds like something the dealer should honor if it’s in a reasonable timeframe. Hopefully someone else has more info for you here!
Not to get off topic on the EPA and tuners, but yes... they have went after MANY and in return those guys stopped selling. I'm giving my personal opinion. Until those companies stop selling tuning, people is going to buy them.
Welcome!
Plenty of talk in this thread around the air suspension: https://www.ecodieselram.com/forum/threads/air-suspension-problems.1295/page-3#post-17761
None of those mentioned will work. The EcoDiesel has security restrictions that has limited the amount of tuners/devices that will work with the ECM.
However, I did see a post that OBD II flashing is coming soon for the EcoDiesel, so it might be sooner than you think and a few of those devices...
Welcome! Really, the only way to tell is to have someone who tunes EcoDiesels to read the ECM and see if anything stands out. Tuners have capabilities to do this.
I think you're on a good path since your out of warranty.
Hi Marcus - the only info I have for you is to call some automotive (or preferably diesel shops) within a relatively close distance to see if they have the tool.
Welcome. I'm not tuned so I can't help you there.. but others here are and will chime in I'm sure. Moving this to the performance section to discuss the tuning.
Welcome! Great looking truck. I would start reading this forum:
https://www.ecodieselram.com/forum/forums/ecodiesel-maintenance.29/
That'll be a good start.