Just to add to this, I have the fuel level sensor failure on my 2014 Ram 1500 and It's very repeatable if not repaired.
Mine will throw a code at 3/8 full, then show empty. Code is always the same, Fuel level sensor voltage high(P0463). I went in the my local Jeff Wyler dealer to get new "Mopar" antifreeze due to a faulty water pump bearing going bad @ 85k miles and asked about the fuel level sensor. The Manager just happened to be there and said that he's had a lot of replacements on the rams for this error and the current replacement procedure is to sell you a whole new fuel pump assembly. I checked with their team that schedules recall fixes and they didn't show any recall for this particular issue.
I assume that the contacts that are supposed to be reporting fuel levels are bending due to everyday use and are coming out of contact after a certain range of motion. In my case, my tank used to get down to about 1/8 before it failed and showed empty with a CEL. Then after a while I noticed it would start at 1/4 and now it fails at 3/8. Here is a link to a replacement pump that shows the contacts on a standard fuel pump assembly for our Rams.
https://www.showmethepartsdb3.com/BIN/documents/Airtex/TSB-0410-01_ATX.pdf
Unfortunately, since it's been 20 degrees out for a couple weeks here in Ohio, I haven't gotten a chance to drop the tank to test my theory and it's not something that is detrimental to my vehicle running. I just keep an eye on miles and usually end up filling 20 gallons at a time.
