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It’s crazy we have to this kind of stuff. I would check all those connectors, blow them out nice and dry, I would also dielectric grease every pin to ensure moisture and corrosion are put to a full stop. Anyways that’s what I would do if I had this issue. I would obviously give my dealer a chance to try and fix the issue, but if they didn’t do anything like this I would follow and do it myself. The other item to do is both trailer plugs on the tailgate and the one in the box. Moisture from washing, heavy rain, really could create havoc with intermittent issues.
It’s crazy we have to this kind of stuff. I would check all those connectors, blow them out nice and dry, I would also dielectric grease every pin to ensure moisture and corrosion are put to a full stop. Anyways that’s what I would do if I had this issue. I would obviously give my dealer a chance to try and fix the issue, but if they didn’t do anything like this I would follow and do it myself. The other item to do is both trailer plugs on the tailgate and the one in the box. Moisture from washing, heavy rain, really could create havoc with intermittent issues.
I don't have the remote actuating tailgate but I agree with this thought. I was getting random alarms on the dash saying my traction control (IICRC) was off and hill descent was off and I don't even have hill descent. From threads on this forum I decided to hit my rear connections up with T-9 and heat shrink them. Have not had the issue since and that was in the spring I think. Can't say for certain it was or was not the fix....it's just what I did and so far it's working to avoid any electrical issues.
Just FYI I thought I had the same issue but for me I discovered that I had a nasty habit of grazing the tailgate button when I was reaching for the ebrake handle. They are very close. Had a habit of bracing the heel of my hand against the dash and using my fingers to pull ebrake while my hand rest on dash for leverage this almost always hits the tailgate button. I did it at least 3 times before I retrained my muscle memory to be aware of the button when releasing the brake. I also sometimes just use my toe of boot to pull ebrake handle or hit the camera button before taking off to ensure the tailgate is up. I think if ford was going to make a electronic tailgate they should have spent the extra money on a sensor like the doors have to let you know if its not latched. It could warn once if its down after at start up and you could be able to dismiss it just like you can dismiss the parking sensors when the tailgate is down. They should also lock it out if your in drive, park and reverse is the only time you would ever need to drop the tailgate while in gear.
I pulled the suspect connectors apart on my 2018 the first week I had the truck and filled with dielectric grease. That was back in July. I also keep the fob in the center console when I'm driving. So far- I've had no issue. But it's still on my mind that it may happen. Good luck OP in getting it resolved.
I have seen reports that folks had their tailgate drop when they release the parking brake. The brake pedal would swing up and impact the dash, in the process it would shake the drop button / module enough to cause it to drop the gate. The poster that found this just unhooked the drop button on the dash.
I think a better long term solution would be to see if you can convert your tailgate over to the non remote release style mechanics in the gate. As it is now even if you get out and pull on the tailgate handle it is still an electric actuator that is opening the gate for you. Some folks have had issues where they could not remote drop it, and the handle wouldn't work either leaving them with a stuck closed gate.
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