Unintended acceleration and/or deceleration using Bluecruise

[pbgear]

I have been having multiple instances where the bluecruise will either slam on the brakes and reset itself without provocation from 80 to 65 mph or less (making the driver behind me have to slam on their brakes and/or switch lanes) and at other times I will have bluecruise set at 70 and it will decide it wants to reset itself to 85 mph when my hands were not on the wheel. Anyone else encountering this phenomena? Reminds me of the phantom braking issue that Tesla was having that caused at least one known fatality.

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[MacherAWD]

Do you have it set to speed sign recognition and auto adjusting? I have that set on mine, so if I am doing 70mph, and the highway changes to a 50mph the car slows. You can have it always drive the posted speed, or have it always drive a certain mph over the posted speed.

 

[pbgear]

no, I have that off - and this occurs on the Atlantic City Expressway which is 65 mph end to end (except for the toll booths of course - which I was not at or near when this happened), as well as the NJ Turnpike.

 

[Mach-Lee]

I agree this sounds like you have speed sign recognition turned on. I think you should double check. Sometimes it will recognize signs that are off the highway (such as on the frontage road) by mistake.

 

[SnBGC]

I have been having multiple instances where the bluecruise will either slam on the brakes and reset itself without provocation from 80 to 65 mph or less (making the driver behind me have to slam on their brakes and/or switch lanes) and at other times I will have bluecruise set at 70 and it will decide it wants to reset itself to 85 mph when my hands were not on the wheel. Anyone else encountering this phenomena? Reminds me of the phantom braking issue that Tesla was having that caused at least one known fatality.

I have had BlueCruise Hands-Free slow down aggressively on 2 separate occasions so far.
The first was because Speed Limit Sign Recognition was turned on and I drove into a portion where the area was under construction and the speed limit changed from 65 mph to 55 mph.

The second instance was when a semi-truck was in the lane to my right and their left tires touched the dashed white line separating our lanes. I was sort of in that driver's blind spot and the car slowed aggressively. I presume the car may have believed the truck was coming into my lane and was taking action to avoid a collision? I never had that happen before in regular BC (previously called ACC+LKA/LC) but perhaps this was added recently?

 

[timbop]

no, I have that off - and this occurs on the Atlantic City Expressway which is 65 mph end to end (except for the toll booths of course - which I was not at or near when this happened), as well as the NJ Turnpike.

Are you certain you've got the speed sign recognition turned off? I've driven both of those roads quite a bit and never seen that happen with bluecruise. I have noticed that handsfree tends not to engage on the west/north bound side of the ACE, but works fine on the south/east bound side.

Note: if cars pull in front of you, then yes it slows down to increase the following distance to where you've set it but it doesn't jam on the brakes - at least in my experience

 

[Ford Motor Company]

I have been having multiple instances where the bluecruise will either slam on the brakes and reset itself without provocation from 80 to 65 mph or less (making the driver behind me have to slam on their brakes and/or switch lanes) and at other times I will have bluecruise set at 70 and it will decide it wants to reset itself to 85 mph when my hands were not on the wheel. Anyone else encountering this phenomena? Reminds me of the phantom braking issue that Tesla was having that caused at least one known fatality.

Hi there, I'd be happy to look into your Mach-E's Blue Cruise issue on my end. Will you send us a message with your VIN and dealership info? I can look into things on my end.
Natalie
Ford Social Media Team

 

[RickMachE]

I have been having multiple instances where the bluecruise will either slam on the brakes and reset itself without provocation from 80 to 65 mph or less (making the driver behind me have to slam on their brakes and/or switch lanes) and at other times I will have bluecruise set at 70 and it will decide it wants to reset itself to 85 mph when my hands were not on the wheel. Anyone else encountering this phenomena? Reminds me of the phantom braking issue that Tesla was having that caused at least one known fatality.

BlueCruise handsfree does not function over 80mph.

 

[timbop]

Are you certain you've got the speed sign recognition turned off? I've driven both of those roads quite a bit and never seen that happen with bluecruise. I have noticed that handsfree tends not to engage on the west/north bound side of the ACE, but works fine on the south/east bound side.

Note: if cars pull in front of you, then yes it slows down to increase the following distance to where you've set it but it doesn't jam on the brakes - at least in my experience

Also, if a car is in front of you going slower than your set speed and then moves to another lane leaving a gap in front, the car will of course try to accelerate to the speed set in the adaptive CC. That may end up meaning you accelerate only to then slowdown when the next car in front of you is also driving slower than your set CC speed.

 

[JohnFoxeSheets]

no, I have that off - and this occurs on the Atlantic City Expressway which is 65 mph end to end (except for the toll booths of course - which I was not at or near when this happened), as well as the NJ Turnpike.

There are two separate places in the settings that are related to speed sign recognition. There's Speed Sign Recognition which is in Driver Alerts and is what provides the speed sign on the IPC, and there's Speed Sign Recognition which is in turn in Intelligent Cruise Control which is in the section on Adaptive Cruise Control and/or BlueCruise (I honestly don't recall exactly where and I think the exact wording depends on the version of s/w you have). If you turn off Speed Sign Recognition in Driver Alerts, it does nothing to change the behavior you're experiencing. When I first got my car I had similar problems when using BC. I thought I'd turned the feature off, but in fact I'd only turned off Speed Sign Recognition that affects the IPC display and not the Speed Sign Recognition that is part of Adaptive Cruise Control / BlueCruise.

I'm pretty sure if you check the settings within the Adaptive Cruise Control / BlueCruise section, you'll see that Speed Sign Recognition is enabled there.

 

[Valkyrie]

There were two separate times where I was following Honda CRV's at low speeds and the automatic cruise control (not Blue Cruise) suddenly sped up as if the CRV was no longer one car length in front of me.

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