Adaptive Cruise Control Disengaging

27602 Views 29 Replies 13 Participants Last post by intimidater51980, 12 d ago

Wxman

Discussion Starter · Jan 25, 2017

How many people are having trouble with the adaptive cruise?? 2016 Premier. I have had many times a message that Adaptive Cruise Temporarily Unavailable. This happens fairly often when there is really heavy rain, snow or a lot of slush, etc. Although irritating, I thought it was understandable.
Lately, have started getting a message that Adaptive Cruise Control Disengaging, and it does shut down. These have been happening for no apparent reason, day and night, no bad weather. When these instances happen it will immediately start working again if I hit the set button again. This is not like the temp unavailable message that has happened in bad weather and the cruise will not work until weather clears or slush melts.

Irritating. Last trip it kicked off 4 times in a two hour span. Anyone else having this experience? I have one free oil change left and will mention when I take it in. I just know they have trouble with these intermittent problems.

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PC2

· #2 · Jan 26, 2017

I have had the same intermittent problem in my Premier. I even had the dealer reset the software but it still happens once in a while. See my thread below.

http://www.chevymalibuforum.com/for...70-adaptive-cruise-control-not-available.html

Not a weather issue for me as I live in L.A. but happens when the traffic is more stop and go. So radar and electronics are working harder than just hiway cruising.

Usually is available again after a few minutes so I have not returned to dealer as this is now so intermittent.

Chevrolet Customer Svc

· #3 · Feb 7, 2017

Wxman said:
How many people are having trouble with the adaptive cruise?? 2016 Premier. I have had many times a message that Adaptive Cruise Temporarily Unavailable. This happens fairly often when there is really heavy rain, snow or a lot of slush, etc. Although irritating, I thought it was understandable.
Lately, have started getting a message that Adaptive Cruise Control Disengaging, and it does shut down. These have been happening for no apparent reason, day and night, no bad weather. When these instances happen it will immediately start working again if I hit the set button again. This is not like the temp unavailable message that has happened in bad weather and the cruise will not work until weather clears or slush melts.

Irritating. Last trip it kicked off 4 times in a two hour span. Anyone else having this experience? I have one free oil change left and will mention when I take it in. I just know they have trouble with these intermittent problems.

This certainly isn't what we like to hear, Wxman. Were you able to address the cruise control concern with your dealer as planned? Please don't hesitate to send us a private message with details if we can be of additional assistance!

All the best,

Angela O.
Chevrolet Customer Care

Wxman

Discussion Starter · #4 · Feb 20, 2017

Just to close this out. Waited until it was free oil change time and had them look at this cruise control issue while it was there.
According to the invoice they found two codes U0420 and U0415. Those coupled with the description led them to follow DOC #4538114, reprogrammed power steering control module with latest calibrations.

Service writer said even though it might not seem they are connected the service document mentioned 'our symptoms' and they thought this was probably a good fix.

cp-the-nerd

· #5 · Feb 20, 2017

Thank you for following up! That's good, detailed info for other owners with a similar problem.

PC2

· #6 · Mar 16, 2017

Wxman said:
According to the invoice they found two codes U0420 and U0415. Those coupled with the description led them to follow DOC #4538114, reprogrammed power steering control module with latest calibrations.

Service writer said even though it might not seem they are connected the service document mentioned 'our symptoms' and they thought this was probably a good fix.

I took my car in for yearly maintenance and asked them to look into my intermittent problem with Adaptive Cruise Control disengaging. I took info on doc you posted and asked for software update.

They found no error codes for ACC but did the upgrade as I requested. I haven't tested ACC yet as I have not taken an extended hiway trip.

The steering feel after update is slightly firmer, needing a tiny bit more effort to turn the wheel. Feels sportier. I like it.

Did your steering feel change?

Wxman

Discussion Starter · #7 · Mar 16, 2017

Can't really say I noticed a change in the steering feel, but my wife is the primary driver of the car. If it did change it is nothing that bothers us. It was never anything like my Silverado.

PC2

· #8 · Mar 17, 2017

It's not bothersome in anyway to me, it's a subtle feel - not night and day, but I could feel it at once, at least on my car. Less power assist and more feel of the wheels and road is best I can describe it.

willy2

· #9 · Apr 11, 2017

I am having the same problem with my 2017 Premier..........on a 90 mi trip it disengaged 5 times.......i read in the owner's manual it will disengage if it dosen't see anything which must mean traffic.....if this is the case then ACC is useless here because where i live you can drive miles and miles without seeing any traffic.....the only way i can get it to work again after it disengages is to pull over to the side of the road and turn off the ignition and let it sit for a couple of minutes and then restart and it will work again for a ways.

Wxman

Discussion Starter · #10 · Apr 12, 2017

Never know if it is the same problem or not, but I would interpret the 'can't see anything' as sensor/camera blocked by dirt, slush, etc., not 'there is nothing to see'.

At any rate I have not had any problems since the fix I described above.

PC2

· #11 · Apr 13, 2017

This still happens to me every once in a while as far as the ACC disengaging. When it does I just revert to OSDM (old school driving method, manually controlling the gas and brake) for a few minutes. Usually, when I try to reengage it does.

When I first starting having this problem, a few months after purchase, it would not reengage.

During this period when the Adaptive Cruise Control would not reengage, there was a faint whirring sound that lasted about 4 seconds followed by a few clicking sounds every time I unlocked the doors before starting the car. To me it sounded like a solenoid or servo on a camera moving the lens forwards or backwards. It was coming from in front of the radiator, dead center, though I could not see what it was through the grille, after some research that is where the radar unit is.

The sound happened only when the car doors were unlocked by keyless fob (?) and only while the cruise control was offline.

When I finally had time to take the car to the dealership and they reset the ACC, the clicking and whirring sounds were gone. The service people even heard it when they had it but when the sound was gone they did nothing further. Speculation on my part but that sound starting only when the radar controlled system problem occurred and then being gone after the ACC was reset seems related. Wish we had more info on this but my bet is that it is the radar unit making that noise.

They never found any error codes pertaining to ACC issue. So now I use ACC more carefully. Disengage it when in heavy traffic requiring stop and go, or when a quick stop is approaching due to rapidly stalled traffic.

There have been enough posts on this forum about this issue to warrant Chevy to do an in depth analysis of this problem. Especially as some of us are mid way through warranty period.

Hope the Chevy rep reads this.

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willy2

· #12 · May 6, 2017

I found out why mine is desengaging......if there isn't a car in front of me in my lane that it can detect it will disengage and won't engage again until there is a car in front of me....it dosen't matter how many vehicles are coming from the other way......it won't re-engage until there is a car in front of me that it can detect.........i have tried this many times to make sure if that is what is happening and its the same every time.....as soon as the car in front of me gets so far ahead that it can't detect it anymore it disengages.

Wxman

Discussion Starter · #13 · May 6, 2017

That is definitely dorked and makes cruise almost worthless. I hope you can get it addressed and fixed.

PC2

· #14 · May 6, 2017

I agree. What's the purpose of maintaining a specified speed if it only works when there are cars in front of you?

Mine is the opposite, it seems to have a problem in heavy traffic not on the open road. I am still having intermittent unavailability.

I am thinking there are defects in the software, mechanics or both.

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tnmats

· #15 · May 7, 2017

willy2 said:
I found out why mine is desengaging......if there isn't a car in front of me in my lane that it can detect it will disengage and won't engage again until there is a car in front of me....it dosen't matter how many vehicles are coming from the other way......it won't re-engage until there is a car in front of me that it can detect.........i have tried this many times to make sure if that is what is happening and its the same every time.....as soon as the car in front of me gets so far ahead that it can't detect it anymore it disengages.

Something is definitely wrong with the ACC in your car. The owner's manual says explicitly that if no cars are around it'll act like any normal cruise control. I tried mine yesterday on an open stretch of road with no cars around, it held at speed with no problem.

Out of curiosity, I assume the sensors in the front bumper, the camera on the windshield and the sensors in the opening below the grill are not obstructed in any way?

willy2

· #16 · May 8, 2017

Yes everything is clean........also in the owner's manual it gives reason why the ACC with automaticlly disengage and one is "No Traffic or other Objects are being detected"........."The sensors are blocked"......."The traction Control System (TCS) or Stabili Trak system has activated or been disabled.

tnmats

· #17 · May 8, 2017

Yes, you are correct but that implies *nothing*, as in not even a tree or anything on the sides is being detected either (I think that implies the sensors think the car isn't moving). That's not your case, there's something amiss. Look at the other items in that list, the entire heading says you need to brake during those conditions.

The system should just work like any other cruise control when no cars are around; if not, then someone is a brain dead ape that designed the software and I doubt anyone would be that stupid. Get the dealer to check the system.

Out of curiosity, is your s a 2016 or 17? Mine's a 2017 and still rather new (less than 1k miles on it). It didn't act like yours at all.

willy2

· #18 · May 8, 2017

Mine is a 2017 with about 1500 miles on it

tnmats

· #19 · May 8, 2017

Ouch. Something is definitely screwed up, mine's like yours and doesn't act like that (yet).

If anyone at the dealership says "normal", I'd kick up a fuss. If GM says it's "normal" for real then that system was, as we designed engineers often say, "designed by monkeys". There's plenty of long stretches of road that you won't pass a soul for miles, the ideal use for cruise control.

robinator

· #20 · Feb 14, 2019

I have a 2017 Impala Premier and never had an issue until I hit a deer and needed front end repairs. Now experiencing this acc disengaging issue. Now going to take to dealer for the third time. Seems like they don't have a clue as to why this is happening. Has anyone found a fix for this? Any Chevy reps out there that can help?

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