ACC problems
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Junior User
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From: SWFL
ACC problems
I have a 2019 F450 and the adaptive cruise is great when it works, which is most of the time. However, it intermittently says the sensor is blocked and disables the cruise. The sensor is clear and clean. The system will quit in clear, dry daylight conditions. It may or may not come back to life on any given drive. I’m getting ready for a long tow and would like to get this fixed
The plug was clean and seated and sensor seems secure. I checked it and threw a little dialectric grease on it today.
The only other odd behavior I’ve noted is the pre-collision warning goes off briefly when approaching and passing through random green traffic lights. On one road it my go off on 2 or 3 of 7 lights seemingly without any pattern. It’s as if the light systems have some kind of interference with the pre-collision system.
Is this common and/or is it a “give to dealer and hope they throw enough parts at it” fix?
The plug was clean and seated and sensor seems secure. I checked it and threw a little dialectric grease on it today.
The only other odd behavior I’ve noted is the pre-collision warning goes off briefly when approaching and passing through random green traffic lights. On one road it my go off on 2 or 3 of 7 lights seemingly without any pattern. It’s as if the light systems have some kind of interference with the pre-collision system.
Is this common and/or is it a “give to dealer and hope they throw enough parts at it” fix?
Postmaster
Joined: Jan 2019
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I have had the ACC turn off saying the sensor was blocked while towing my camper only one time. I turned the setting to normal cruise and kept getting fault warnings. I got out and there was one small splattered bug on the casing so I wiped it off and all was good again. I have never had that happen when not pulling my trailer. I read somewhere that when hooked up to a trailer and tow haul activated, the adaptive increases the distance automatically to allow you to have enough time to react. I’m thinking the sensor was obstructed enough by the bug guts to not read far enough out.
There is one intersection in my city that causes my pre collision alert to go off 50% of the time. From what I’ve seen, it can be normal.
There is one intersection in my city that causes my pre collision alert to go off 50% of the time. From what I’ve seen, it can be normal.
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Joined: Sep 2018
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I'd say not a common problem.
I've had my ACC shut off, reporting the sensor was blocked during severe snowstorms in Utah. This is not your problem as the plastic cover was truly covered with snow.
I've also had the ACC shut off multiple times despite the fact that the sensor was NOT blocked. This was after I had tried to remove the unit, to allow access to the bumper tow hook bolts behind it to drop the bumper. I fixed it by adjusting the angle of the ACC unit itself; I think I had screwed it in too far thus changing the angle of the sensor. Not sure if this is relatable or not, but perhaps mark the original position of the bolts, and adjust forwards or backwards to slightly adjust the angle. If it's not the mechanical angle of the sensor, then I suppose I'd suggest to have a dealer look at it.
Or maybe not even mess with it at all, and have the dealership look at it if you don't want them accusing you of mucking with the system.
I've had my ACC shut off, reporting the sensor was blocked during severe snowstorms in Utah. This is not your problem as the plastic cover was truly covered with snow.
I've also had the ACC shut off multiple times despite the fact that the sensor was NOT blocked. This was after I had tried to remove the unit, to allow access to the bumper tow hook bolts behind it to drop the bumper. I fixed it by adjusting the angle of the ACC unit itself; I think I had screwed it in too far thus changing the angle of the sensor. Not sure if this is relatable or not, but perhaps mark the original position of the bolts, and adjust forwards or backwards to slightly adjust the angle. If it's not the mechanical angle of the sensor, then I suppose I'd suggest to have a dealer look at it.
Or maybe not even mess with it at all, and have the dealership look at it if you don't want them accusing you of mucking with the system.
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From: SWFL
Thank you both for your replies. I had previously figured it was a few strategically smashed bugs causing it but since I figured out where the sensor was (plastic box next to driver’s side tow hook) and inspected it, it’s free and clear of debris.
In steady rain, it shuts down, but I believe the manual indicates that’s normal.
I will run it back to the dealer to check. I just hate giving intermittent problems to them as “cannot duplicate” is often the response. And as a mechanical person, I get that. To their credit, they fixed the nasty rattles I had coming from the roof and under the dash. But that only took a week and half.
The random collision warnings are just freaky. Still wondering what the heck sets it off? Do stoplights have some radar interference or what? Does the camera on the windshield come into play at all? Not a big deal as long as it doesn’t slam on the brakes but still would be nice to know why.
In steady rain, it shuts down, but I believe the manual indicates that’s normal.
I will run it back to the dealer to check. I just hate giving intermittent problems to them as “cannot duplicate” is often the response. And as a mechanical person, I get that. To their credit, they fixed the nasty rattles I had coming from the roof and under the dash. But that only took a week and half.
The random collision warnings are just freaky. Still wondering what the heck sets it off? Do stoplights have some radar interference or what? Does the camera on the windshield come into play at all? Not a big deal as long as it doesn’t slam on the brakes but still would be nice to know why.
Postmaster
Joined: Jan 2019
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You could try playing with the sensitivity settings for your collision avoidance. If I remember right, I turned mine to the lowest setting and haven’t had it go off since. I should of mentioned that in my first reply.
When my ACC faulted while pulling my trailer, I was in and out of rain. It was working in the rain but faulted just after it stopped. Maybe road spray from my tires was doing it. I had the entire highway to myself that day lol
When my ACC faulted while pulling my trailer, I was in and out of rain. It was working in the rain but faulted just after it stopped. Maybe road spray from my tires was doing it. I had the entire highway to myself that day lol
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Junior User
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From: SWFL
You could try playing with the sensitivity settings for your collision avoidance. If I remember right, I turned mine to the lowest setting and haven’t had it go off since. I should of mentioned that in my first reply.
When my ACC faulted while pulling my trailer, I was in and out of rain. It was working in the rain but faulted just after it stopped. Maybe road spray from my tires was doing it. I had the entire highway to myself that day lol
When my ACC faulted while pulling my trailer, I was in and out of rain. It was working in the rain but faulted just after it stopped. Maybe road spray from my tires was doing it. I had the entire highway to myself that day lol
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