Trailer Driving Assist is Stuck - Ghost Trailer

[sportygeekgirl]

Hey all -

I have read about this in a few forums, but there isn't a proper solution for people who don't own trailers.

About a month ago I was towing a 5x9 UHaul utility trailer and everything was fine, until I turned the trailer in to the rental place and the truck kept insisting that there was a trailer attached when there wasn't. It's been a month with drive times sans trailer in between and short of renting another trailer (which is silly) to fix this, it remains a problem.

I am also not prompted with the Trailer Detected message so I can't respond yes or no. I only get the message in the attached image that systems are unavailable and a trailer has been detected so trailer driving assist is active.

Another issue is when I am adding a new trailer to try and force a delete of a trailer that doesn't exist, there is an error message that appears right before loading the presets for each trailer input (attached gif).

I have tried:

1. Disconnecting the negative battery for about 40 mins
2. Disconnecting the entire battery for about 40 mins
3. Pulling fuses that have some kind of trailer name on them
4. Buying a bike rack, putting a bike on it to see if it would be recognized
5. Bouncing on the ball hitch (hell, why not)
6. Turned off BSM because it looks like that is used to detect a trailer
7. Tried testing the cheap magnetic trailer lights I purchased from Harbor Freight and unplugging them to see if that had any impact
8. Tried backup assist, which seems to think I have a trailer attached even though nothing is visible
9. Adding and deleting a trailer in the trailer settings
10. Turning on Tow Haul mode for funzies