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Thank you for the link. I read the initial posts and google doc on Forscan. Unfortunately I'm all in on apple products at this point so can't use the full Forscan product to make changes. Not sure I want to spend 200-300 dollars just to disable the double honk - especially since my wife and...

I have the Mx+ Do you need the free version of FORScan or the FORscan light version that you have to pay for on Apple Store?

Just an update to my post. I got in my truck this morning to take kids to school and battery had gone from about 77% to 74%. I had gotten in and out of my truck a couple times to get some things out of it so the lights came on so that 3% drop seems to make sense. I drove and let the truck idle...

I’m sure there is, I’ll have to research that a bit.

I kind of forgot about the auxiliary battery. I have no idea how it interacts with the main battery so maybe you’re right. I have not investigated it in anyway are the auxiliary batteries the exactly the same as the one under the hood? If so, maybe I should just replace that stupid thing as...

Yeah, after posting this thread I was thinking that it’s possible the BMS just had to update itself for the new battery and perhaps the 90% that it gave me right after the install was just a default reading for a new battery install. As I understand the BMS system- it will update itself after...

No, I replaced the battery yesterday, there’s a link in my initial post.

Pretty sure that my truck is all up-to-date on software

I experienced the low state of charge warning on my 2021 F150 lariat powerboost last month. I researched and found through this forum that it was a common problem. I bought the OBDlink MX+ and found my charge was about 30%, I tried some long drives, leaving it running with fan on 5 and could...

Uh Oh, I'll have to spend some time getting caught up. Thanks to all you detectives that have kept updating!

Funny, I had both the underbody and trailer brake control problem on one camping trip - which is when I posted the trailer brake not working post originally!

Thread OP here. Just got my recall notice in the mail so decided to log on and check the thread. Had not checked since my last post in August of last year. Wow, this became such a wide spread issue. I was going to post my recall notice but I see everyone is aware of the Recall. I have not...

Crazy. First tow and you have the same problem.

I like the diary idea. Maybe we all have the same problem or maybe we have different issues causing a very similar presentation. Seems like it is so similar though that it has to be some sort of problem with the trucks electronic control system. Why else would so many of us be having this? I...

Yikes, Sad thing is I otherwise love my truck. I'm going on a trip September 9-12, if it happens again I may have to start searching as well. It's also really hard to buy a new truck right now.... Glad you're OK.

Jeb, I think your theories are on the right track, I will do some testing next time I tow. I think that when I stopped at Walmart and got the compressed air what really worked was the fact that my truck was off for 10 or 15 minutes and then I turned it back on and reconnected. I can’t remember...

Jeb, on the two examples I gave on my previous post, I did indeed do a manual override before setting off on my trip and verified the brakes were working. I always do this now since I have had this issue and I had assumed that if they were working when I left I was good. I was quite surprised...

I have a similar thread about a very similar issue, seems to be widespread based on the replies. I have had the problem many times now. My 7 pin tester seems to show everything is fine.

As the OP of this thread, I feel bad I have not checked back for a while. I would like to give another update: I have also continued to have this problem: 1. I thought I had it figured out. I tow with a propride hitch, which makes the hitch a big longer than normal - a 7 pin connector...

OK, thanks for everyone contributing. Update: Went to test the trailer today. Wanted to make sure the trailer brakes were operational. Decided to pull the emergency breakaway switch and could hear the brakes working fine. Then I turned on the "battery disconnect" button on my airstream and...