Issues / glitches during 2021 Bronco startup -- "Check brakes," "trail turn assist unavailable," and "hill assist unavailable." error messages

[Lcubed]

BTW: "Throwing Codes" is a great band name.

that's one way to get attention if you're in the hospital!

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[evilletruck]

So I had the doors off today, and drovr around 75 miles total. Around lunch, I jumped in the Bronco and started it up. It kicked "Check brakes," "trail turn assist unavailable," and "hill assist unavailable." The traction control may have faulted too, along with the ABS. I turned it off, waited about ten seconds, and turned it back on. It started fine, but the E brake was engaged. I disengaged it and all was fine. It did it one other time, out of probably 10 startups total.

I wonder if the fault is in the door electrical connections. Maybe the system senses the doors are off and it sends a fault. The other glitches I have read reset when the doors were opened, and mine has only done it with doors off.

Overall, not a huge deal, and probably to be expected with a new and first-year vehicle.

Had same experience with doors off , Bronco is currently at dealership for other issues as well but reported these to them to make sure they get added to the things they are working with engineers on.

 

[da_jokker]

The thing Jeep can't seem to get right is the electronic gremlins.... Come on Ford?!?

 

[71to21-2DR]

Do make black tape big enough to cover the entire Screen?

 

[StickerFab]

So this happens to me but disappears before we get moving...

 

[Matthew]

This is the second time I have had the doors off on mine. The first time was for about a week, and never had this happen. I took the doors off on Saturday however, and had the same thing happen Sunday afternoon. The Bronco was parked in the garage and the e brake was not set. We were all in, foot on break, hit the start button, and every warning popped up on the screen, and the e brake set itself. I hit the start button to shut it off, then held the brake and hit the button again and it started normally. Had to release the e brake and all was well. The next start it did not happen, but the same thing happened this morning when I tried to leave for work.

 

[Bronco21fan]

T

So I had the doors off today, and drovr around 75 miles total. Around lunch, I jumped in the Bronco and started it up. It kicked "Check brakes," "trail turn assist unavailable," and "hill assist unavailable." The traction control may have faulted too, along with the ABS. I turned it off, waited about ten seconds, and turned it back on. It started fine, but the E brake was engaged. I disengaged it and all was fine. It did it one other time, out of probably 10 startups total.

I wonder if the fault is in the door electrical connections. Maybe the system senses the doors are off and it sends a fault. The other glitches I have read reset when the doors were opened, and mine has only done it with doors off.

Overall, not a huge deal, and probably to be expected with a new and first-year vehicle.

take it in to get looked at bye Ford so it’s documented and no this should not be expected first year vehicle or not take it in to get fixed something is wrong with it.

 

[Bronco21fan]

Seems like this

This is the second time I have had the doors off on mine. The first time was for about a week, and never had this happen. I took the doors off on Saturday however, and had the same thing happen Sunday afternoon. The Bronco was parked in the garage and the e brake was not set. We were all in, foot on break, hit the start button, and every warning popped up on the screen, and the e brake set itself. I hit the start button to shut it off, then held the brake and hit the button again and it started normally. Had to release the e brake and all was well. The next start it did not happen, but the same thing happened this morning when I tried to leave for work.

is happening to more and more people wouldn’t be suprised if there’s a recall

 

[SnowBronco]

Blow on it first…if that didn’t work put it in the freezer for a few seconds

 

[88to21bronco]

This is the second time I have had the doors off on mine. The first time was for about a week, and never had this happen. I took the doors off on Saturday however, and had the same thing happen Sunday afternoon. The Bronco was parked in the garage and the e brake was not set. We were all in, foot on break, hit the start button, and every warning popped up on the screen, and the e brake set itself. I hit the start button to shut it off, then held the brake and hit the button again and it started normally. Had to release the e brake and all was well. The next start it did not happen, but the same thing happened this morning when I tried to leave for work.

I took mine in and had the codes read by Ford the week it happened. It happened the next time I took the doors off so I called them again. After some research, they concluded that I had to put my seatbelt on BEFORE starting it and it would avoid the errors.

Well...sometimes it works, sometimes it doesn't. I have had it still act up once or twice with my seatbelt buckled.

 

[Matthew]

I took mine in and had the codes read by Ford the week it happened. It happened the next time I took the doors off so I called them again. After some research, they concluded that I had to put my seatbelt on BEFORE starting it and it would avoid the errors.

Well...sometimes it works, sometimes it doesn't. I have had it still act up once or twice with my seatbelt buckled.

Interesting. Thank you. I am pretty sure I did have my seatbelt on this morning when it happened, but I know I did not the other time.

 

[Contact]

Interesting. Thank you. I am pretty sure I did have my seatbelt on this morning when it happened, but I know I did not the other time.

Were the doors back on or still off when the warnings occur?

 

[Lazerus]

It's definitely a software issue. No matter how much testing has been done, there are always specific sets of parameters that just aren't covered in the coding - particularly in new platform vehicles. When those parameters are met, the system doesn't have a definitive response, so it'll throw the error codes for that sub-system ( brakes & traction control in this case ).
As they say, "no plan survives first contact with the enemy"
The more it happens, the quicker the programmers can work out a fix. Intermittent issues caused by 'buggy code' is a real pita to chase down because of the inconsistency...the last thing you want is a 'fix' that messes up the rest of the system integration.

 

[Matthew]

Were the doors back on or still off when the warnings occur?

Doors were and are still off.

 

[mpeugeot]

Guy on YouTube says you can NOT start Bronco with doors off without being seat-belted. Is that true???

No, it's not true. I did it with a doors off WT this weekend, started up just fine... no doors and no belts.

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