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

88to21bronco

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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.
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Theherofails

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Same errors as the infamous video going around of the GOAT failure with a completely different cause and in a completely different situation.

I think there is a gremlin in the system pulling wires.
 

flip

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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.
NOT NORMAL. PM me your VIN if you're OK with me checking to see if there are any codes popping up in OASIS. May have something to do with e-brake engaged but if you didn't engage it, that's a problem.
 

Toccoa

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Thanks for beta testing the Bronco. (y) You have eight months or so to get all the bugs out of it before they build mine (I hope). 😁
 

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Parking brake.
 
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88to21bronco

88to21bronco

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Thanks for beta testing the Bronco. (y) You have eight months or so to get all the bugs out of it before they build mine (I hope). 😁
My pleasure!
 
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88to21bronco

88to21bronco

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I don't know what the purpose of this procedure is but the FORD door removal video says to follow this procedure:
push the start/stop button with your foot off the brake
lower the windows
then push start/stop again after lowering the windows (again with foot off the brake)
then disconnect the doors

Then after reconnecting the doors, push start/stop again with the foot of the brake.

I'm not saying many Bronco owners will know this procedure, remember this procedure or follow this procedure. But I'm wondering if the warnings and error messages are a result of not following it.
Could be I suppose. But two things give me pause:

1. I've taken off the doors one other time without doing the above and got no faults.

2. It happened after maybe the 4th startup.
 

2021badlands bronco bob

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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.
You are not..alone on this I’ve seen some of this on YouTube already.. Please keep us updated 😳""..... good luck
 

khatch

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Could be I suppose. But two things give me pause:

1. I've taken off the doors one other time without doing the above and got no faults.

2. It happened after maybe the 4th startup.
To be perfectly honest, I don't think the software should require procedures like this. At most, an indicator light that a door is disconnected would be fine. And the software sounds buggy based on the inconsistency.
 

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HarderCorer

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Could be I suppose. But two things give me pause:

1. I've taken off the doors one other time without doing the above and got no faults.

2. It happened after maybe the 4th startup.
For some reason I'm thinking of my old NES where you'd have to blow on the cartridge, tap it three times and then gently close the door. I know there is at least one other person on this forum that will get that reference...

The controllers were indestructible but don't you dare glance at the system.
 

jay-rod427

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All good it will get an over the air update soon to fix itself;)
 
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88to21bronco

88to21bronco

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So @flip was able to read my codes via his online voodoo 😂

Recurring ABS fault. I'll get it checked out.
 

FourHorses

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push the start/stop button with your foot off the brake
lower the windows
then push start/stop again after lowering the windows (again with foot off the brake)
then disconnect the doors
The point of this procedure is for nothing more than to turn on/off accessory power to lower the windows.
 

peta8368

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I don't know what the purpose of this procedure is but the FORD door removal video says to follow this procedure:
push the start/stop button with your foot off the brake
lower the windows
then push start/stop again after lowering the windows (again with foot off the brake)
then disconnect the doors

Then after reconnecting the doors, push start/stop again with the foot of the brake.

I'm not saying many Bronco owners will know this procedure, remember this procedure or follow this procedure. But I'm wondering if the warnings and error messages are a result of not following it.
that sounds like just providing power to the windows. and foot off the brake so you don't accidentally start the engine.
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