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  #13  
Old 03-13-2014, 10:44 PM
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I had almost the same exact problem with mine since new... Jan '14 build Overland with diesel. I brought it to the dealer, and the tech did two things:
1. Removed the sensor lens and cleaned the inside of it (not outside)
2. Ran the sensor calibration procedure with dealer scan tool

Now after he did this, he said that an error code C15a5, sensor reports blocked got logged during his road test, so he's gone and ordered a new sensor... But in the mean time, while I wait for the replacement sensor to arrive, I swear the ACC has been working much better! Two days, including through rain and snow, and I haven't had the ACC/FCW unavailable message come up once.

I don't know exactly what's going on... I could believe that road salt or general road grime could be part of the problem, especially this time of year in New England but I only picked up my GC in Feb so I don't have a lot of experience yet with ACC.

The users manual says that if this message comes up more than once a trip, you should bring the vehicle in to a dealer to have the sensor recalibrated. Maybe you could ask them to do this?

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  #14  
Old 03-14-2014, 06:37 AM
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Re: Issues with ACC

I thought about this as well and I think there might be fogging/condensation on the inside of the protective lens (just like for the headlights). We might not see the end of this until the summer. Which, in Chicago, might be in August of this year. In fact I want to remove the lower part of the front fender and get to the sensor myself and clean it. I know there is a replacement part for the ACC sensor cover so....it can be taken apart.
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Old 03-14-2014, 06:58 AM
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Originally Posted by f1anatic View Post
Let me guess...early build, like mine... My problems started in February 2014. It was fine before that. In fact here's a picture from September 2013 - yes the ACC worked, despite the mud. I think it is related either to some other concurrent updates on the car or cold weather/condensation/freezing or...faulty electronics.
June 2013, but still before the so-called 2014.5s went into production. Mine also worked fine until November. However, we have had a few warm days here, and the sensor still wouldn't work, so I don't think it is related to weather. Also, a lot of people that live up north/in the mountains are not experiencing any of these problems.
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Old 03-14-2014, 06:59 AM
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Originally Posted by SLLJG View Post
My 2014 Overland's Forward Collision Warning has activated when no vehicle was ahead of me. On the other hand, when it should activate, it doesn't. I no longer rely on it or trust it. My Overland was built in April 2013. In mid-summer of 2013, Jeep began to install second-generation Bosch electronics, which I wish my Jeep had.
Mine also does that. I also agree that we should have gotten the ACC with Stop, or at least been notified about it going into production.
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  #17  
Old 03-21-2014, 01:25 AM
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Re: Issues with ACC

Similar but not quite same problem. Mine occasionally displays, "ACC/FCW Unavailable Service Required" and then all cruise is lost. A power off/on cycle and it usually works until the next hiccup. Sensors/camera clean and it happens in perfect or bad weather. Dealer said no codes thrown and could not duplicate. They said sensor was aimed too high and they re-adjusted. No recurrence in 30 days since.
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Old 05-13-2014, 10:44 AM
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Re: Issues with ACC

I have all of the same issues. '14 Overland made in April '13. Can't trust the system, what a waste of a $1700 option. My ACC will sometimes work on the highway for 3 minutes but then shuts down on it's own. It also tells me to brake everytime I go under an overpass on the highway.
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Old 05-13-2014, 12:13 PM
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Re: Issues with ACC

^^^^^^

May your sensor is also aimed high, WAY high Who knows, run it by service.
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Old 05-14-2014, 02:22 PM
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Re: Issues with ACC

I am having the same issue. Its been happening for a few months now. The dealer has a STAR (?) case open and will be replacing the sensor. Unfortunately there is no parts available so its a waiting game to see if it will actually fix the problem.
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  #21  
Old 05-14-2014, 02:29 PM
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Re: Issues with ACC

I can tell you from driving a number of these that the system works great when it is working. I even use it while towing my 7k trailer... I have seen a couple of bad / misaligned sensors but definitely see your dealer to get fixed. Totally not a waste of money on this option.
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  #22  
Old 05-14-2014, 02:58 PM
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Re: Issues with ACC

^^^^^

Totally agree with Willx. I am so glad I got the Summit on which it/they are standard. The collision braking is a bit conservative but it's awesome if you get distracted right when someone hits the brakes and the ACC is just plain awesome! Don't know how I lived without ACC. My friends are so jealous when they see it in action.
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  #23  
Old 05-14-2014, 08:45 PM
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Re: Issues with ACC

The feature is great WHEN IT WORKS. When it doesn't, it is an annoyance, a safety hazard, and a waste of $1695.
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  #24  
Old 05-14-2014, 11:44 PM
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Re: Issues with ACC

I'm now 2.5 months since sensor was re-aimed lower and so far no service/unavailable messages. The "unavailable" messages I got before the re-aim didn't shake my confidence in using the feature but had I, or if I ever do, receive unexpected or incorrect activations it would certainly give me the heebie jeebies.
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