P203F / P2509 trouble

[Billet Bee]

We are ful time travelers and are in Elkhart for the month or maybe longer now. My 20 ram 3500 ho hd drw 6.7 is 1 yr old and I've never had any issues until this morning. I'm at 15000 miles and I use hot shot in my fuel for lubricity . Started it and drove to the super market, shopped and came out to leave, went to start it and it just turned over . Turned over fine but wouldn't fire up. Of coarse it's are only vehicle and i instantly got a pit in my stomach that is my time for the cp4 to go. I waited 1 minute to try and restart and it fired right up like normal. We came back to our rv and I have a cheapo obd code reader so i plugged it in before I turned off the truck and immediately it showed 2 codes.
1: p203f reluctant level to low, wich after watching a u tube video is the def fluid or the sensor giving bad info to the ecm. I only use mopar def and it's at 3/4 full.
2: p2509 ecm/pcm power input signal intermittent, wich after watching another u tube video it just said something to the affect of a poor signal to the ecm.
So I made an appt at the local dodge dealership but there over a wk out for my appt to get the process started. So i now post to you all to see if anybody has had this happen and what was it and is there a lose def sensor plug I can check. Any ideas

 

[Tyler89]

Did you ever find a solution to this. My 2021 3500 dually has done this same thing about 20 time in the last 50,000 miles and dealer is no help

 

[Billet Bee]

Did you ever find a solution to this. My 2021 3500 dually has done this same thing about 20 time in the last 50,000 miles and dealer is no help

mine only hasn't started up on that 1 occasion and as far as the codes go, I cleared them out and they also haven't come back on. I did take it to the dealer to have some recalls done and I had them investigate that scenerio which I figured they wouldn't do anything about it but they actually found that one of my batteries were defective and they replaced it for free.