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Unread 02-15-2014, 07:57 PM   #1
97JGCLIMITED
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Adaptive Cruise Control Issue?

2012 Grand Cherokee Overland

Within the past several weeks, I have had two situations where the adaptive cruise control didn't reduce the vehicle speed when there was a slower moving car in front of me. In both situations I had to hit the brakes at the last minute to keep from running into the back of the vehicle. There's no status messages indicating any problems with the ACC. Does anyone know if this is a common issue or fixed by a TSB? I plan on mentioning it when I take the Jeep in for its next service next week but thought I would check on here first.

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Unread 02-15-2014, 08:25 PM   #2
ColdCase
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I don't recall reading of that issue. Most of issues seem to be throwing a fault or the lens getting dirty. Are you sure you didn't set it, or it got reset, to regular cruise control instead of adaptive cruise? There are two modes of operation.
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Unread 02-16-2014, 10:41 AM   #3
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Nope, I always keep it in the ACC mode. Both before and after the two incidents, it was functioning normally. In both situations, the car in front of me was going probably 10-15 mph slower than I was. At smaller speed differences (~5 mph), I haven't had the problem.
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Unread 02-16-2014, 11:13 AM   #4
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ACC: I don't have this feature on my 14 GC but if I did, I would never consider it 100% as opposed to paying strict attention while driving. Matter of time someone get in an accident over a malfunction then will cause law suits.
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Unread 02-16-2014, 03:39 PM   #5
ColdCase
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Its not only Jeep, there are a wide variety of brands using ACC. I've read, for safety, ACC type systems are becoming mandatory on long haul big rigs and they don't give drivers the option to turn it off. If you like to live dangerously, cut in front of one of these new rigs and watch its brakes slam on and the driver bounce off the windshield (I exaggerate). Just don't let him or his friends catch up to you
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Unread 02-16-2014, 05:10 PM   #6
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You said: If you like to live dangerously, cut in front of one of these new rigs and watch its brakes slam on and the driver bounce off the windshield (I exaggerate). Just don't let him or his friends catch up to you.

I know there is more than likely someone out there who would try such a fool thing and laugh about it, provided they lived through it.

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Unread 02-17-2014, 10:50 AM   #7
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Government mandates are just chipping away at our freedoms, and like the proverbial frog in the pot of water, we just continue to think everything is great.
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Unread 02-17-2014, 11:15 AM   #8
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Quote:
Originally Posted by wriggly1dog View Post
Government mandates are just chipping away at our freedoms, and like the proverbial frog in the pot of water, we just continue to think everything is great.
I couldn't agree more.
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Unread 02-17-2014, 04:56 PM   #9
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How about them Bears??? Let's get back to the subject here if we could.




Took the Jeep to the dealer for service today. They couldn't find anything obviously wrong and there were no updates that needed to be done. They recommended I bring it back next week for them to drive around to see if they could replicate the problem.
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Unread 02-17-2014, 07:28 PM   #10
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Quote:
Originally Posted by ColdCase
Its not only Jeep, there are a wide variety of brands using ACC. I've read, for safety, ACC type systems are becoming mandatory on long haul big rigs and they don't give drivers the option to turn it off. If you like to live dangerously, cut in front of one of these new rigs and watch its brakes slam on and the driver bounce off the windshield (I exaggerate). Just don't let him or his friends catch up to you
Like on the speaker thread, some of your responses are so funny! Thanks a bunch cuz I'm having a Lupus flare and the laughs are much appreciated Cold Case.

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Unread 02-23-2014, 05:05 PM   #11
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I love the ACC, I used to drive with CC on all the time, even on long local streets, to ensure no speed trap captures due to speed creep. But the constant adjusting because of so many others not maintaining a constant speed I would have to toggle up and down. I have had some 'surprises' but these are noted in the manual like, when a car slowly moves in front of you while your are accelerating and the sensor does not see him until he is over halfway into your lane etc.. All this means is that you still have to drive and be aware of your surroundings, but for minor adjustments I like being 2.5 seconds behind the car in front of me at all times, no more tail-gaiting.
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Unread 02-24-2014, 03:24 PM   #12
Gunny7
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I've used this.
Love, hate thing.
What I fine, it eventually gets on my Nerves too much.
Distracting.
Rarely use it now.
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