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I would have thought most people would be happy there stop/start is not working since most of us wish the was a way to permanently disable it.
Does the secondary battery perform any other functions besides starting the vehicle after you’ve been sitting at a red light?
That is a good question. They did replace the secondary battery today and told me the warning would remain on for about 5 days so we will see
 

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Mine was not working for a while recently. The message said "Battery Charging" but even after driving for over 30 minutes to work or back home it still said that. I attributed it to the cold weather because once when the temp got up in the 50s it said it was ready. However, today it was back down in the 20s and when I checked the screen it said it was ready so who knows what may have happened.

I usually press the button to turn it off when I reach for the shifter after starting but at least I'd like to know it is working and available if I ever (or the next owner some year) want to use it.
 

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I would have thought most people would be happy there stop/start is not working since most of us wish the was a way to permanently disable it.
Does the secondary battery perform any other functions besides starting the vehicle after you’ve been sitting at a red light?
believe me, you car will run with just the secondary battery, in my case thats what happened. for a week my car was running weird, a lot of engine knocking, tranny shifting, etc. We discovered that the main battery just have 150amp, totally dead but my car still runs. All the power for the computer and accessories came from the secondary battery. Now everything is perfect and my ESS works everytime, i like to use it anyway.
 

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believe me, you car will run with just the secondary battery, in my case thats what happened. for a week my car was running weird, a lot of engine knocking, tranny shifting, etc. We discovered that the main battery just have 150amp, totally dead but my car still runs. All the power for the computer and accessories came from the secondary battery. Now everything is perfect and my ESS works everytime, i like to use it anyway.
Thank you!!
 

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That is a good question. They did replace the secondary battery today and told me the warning would remain on for about 5 days so we will see
Update: No the warning is still there taking it back in on the 17th. I really think the service person was full of BS when he said wait 5 days.
 

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I think it's some kind of charging glitch, not the battery itself. Mine spontaneously started working for one day last week, worked fine all day (maybe two), and then went back to not working at all. Mind you, my secondary battery has already been replaced once.
 
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I think it's some kind of charging glitch, not the battery itself. Mine spontaneously started working for one day last week, worked fine all day (maybe two), and then went back to not working at all. Mind you, my secondary battery has already been replaced once.
Mine did the exact same thing. I stopped using it for awhile and then it wouldn’t work. Had two warm days last weekend. In the low 40s. And it worked perfectly fine. Then it stopped. Might be weather related and that the battery is 3 years old
 

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I would have thought most people would be happy there stop/start is not working since most of us wish the was a way to permanently disable it.
Does the secondary battery perform any other functions besides starting the vehicle after you’ve been sitting at a red light?
The secondary battery is an AGM (absorbent glass matt) battery that keeps the auxiliary devices in your vehicle operating when the stop start system has shut the vehicle down.The vehicle restarts on the regular wet cell battery and there is a relay that separates the two when the engine stop and restart occurs. This is a problem I'm having on on my 1 week old 2020 Grand Cherokee. When the vehicle computer sees the auxiliary battery voltage as being low it increases the charging voltage to around 14.6V which is applied to both batteries and is too too high for the wet cell battery over the long term. Back to the dealer I go....
 

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I got a 2018 TH in Oct 17'. I think the start/stop worked for about 4 months before it started 'battery charging'. After that it would only work if i went on a long drive for 1+ hours. But for about the last year, it hasn't worked at all.

But i'm absolutely fine with that. I don't like the start/stop and now i don't have to hit the button every time i get in.
 

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Mine is in the shop for this issue. Just got word "the tech tested out both batteries and the warranty slip does state that both batteries need to be replaced. so we are going to replace the batteries under warranty." We'll see. I still don't think it's the batteries, but we'll see.

Meanwhile, on Sunday the NAV suddenly it decided it wasn't in Atlanta, it was somewhere near Graceville FL, in a different time zone. I could live with the NAV being lost as I use Google Maps on AA anyway, but I can't live with the dash clock being an hour off. So they're looking at that too, their current report being "Ok so for the nav system looks like there an software update that needs to be done. Unfortunately, our system is down for the rest of today so it will not be today." Hope I'm not making a mistake letting them mess with it. Y'all pray for me.
 

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"Both batteries have been replaced and the start stop function is working properly. However with the update for the navigation system, the tech has attempted to do the software update but the update keeps crashing. They have tried it 8 different times but it still fails. We don't want to hold you up with your vehicle for this update. So you let me know what you want to do. If you want to pick it up you can do that today."

Sigh. Guess I'll just be in Florida for a while.
 

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I got a 2018 TH in Oct 17'. I think the start/stop worked for about 4 months before it started 'battery charging'. After that it would only work if i went on a long drive for 1+ hours. But for about the last year, it hasn't worked at all.

But i'm absolutely fine with that. I don't like the start/stop and now i don't have to hit the button every time i get in.
I have a 2015 Cherokee Latitude. It "was" doing the same thing. I started by getting a trickle charger and keeping my battery charged above 80% that helped. However, it was not long after this fix it started working intermittently again. About 2 weeks ago I decided to change the HVAC cabin filter. The issue with the stop/start went away. I still keep my battery trickle charged about every 2 weeks. however, the ac system works better, and start/stop is now continuously available.
I remember reading in the owner's manual that start/stop will not work until the cabin is within a certain range of the temp. I have the HVAC system set to. The dirty cabin filter seemed to affect the sensor.
 

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I just got a 2017 JGC to replace my aging 2011 and wanted to try out the start/stop feature but it doesn't work. I did have an issue with the battery when I got it because it sat on the lot for about 10 months before I got it and it did run down sitting in my garage while working at home. The battery now shows 14.1v after charging and even leaving on trickle charge but shows "battery charging" on the console display for the start stop. I would hate to spend $100 for the dealer to look at it (out of warranty) for a feature I'm not sure I want but would like it to work regardless. So does replacing both batteries fix this? Park Sense also does not work, is this related?
 

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Replacing both batteries worked in my case but that doesn't mean it will in yours. And no, Park Sense is unlikely to be related to this.

You're not likely to like auto start/stop enough to make it worth paying for. But Park Sense is worth it. (Well, assuming Park Sense is what tells you you're about to bump the vehicle in front or behind you. If it's the feature that parks the Jeep for you, forget it - that's worthless.)
 
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It may not be the battery, but the charging system. I would assume any competent mechanic would load test the battery and alternator before condemning either one. Just because it puts out 13-14 volts does not mean it is doing any work. Just a thought.
Actually, if it is putting out the spec voltage it is supplying the necessary amperage and doing the work. The first that happens when there is not enough amps is the voltage drops.....

However, they may be using PWM to charge battery's, and we are dealing with high amp batteries that can do all sorts of weird things when they malfunction.....

Not saying you're wrong, there could be problems with the charging system.... ....but as a general principal, if your alternator can't provide enough current, the voltage will drop from it and vice-a-versa....
Voltage is not the issue, it's the amps the battery can supply. A battery may show 12-13 volts when using a meter, a load test or smart tester is the best way to test.
Yes, voltage can tell you the state of charge, somewhat, for a battery that is in perfect working order.... ....seen plenty of battery's that had a good float and load voltage, but couldn't provide the amps to crank the engine...

believe me, you car will run with just the secondary battery, in my case thats what happened. for a week my car was running weird, a lot of engine knocking, tranny shifting, etc. We discovered that the main battery just have 150amp, totally dead but my car still runs. All the power for the computer and accessories came from the secondary battery. Now everything is perfect and my ESS works everytime, i like to use it anyway.
Well yea, you have a much bigger than needed battery for good conditions, so that your vehicle will continue to start when you're in severe conditions for the battery..... ....so its not shocking... ...but a bad battery can be a load on the electric system and cause problems for it.... ....if you're alternator is good, then once started, the small battery shouldn't make a difference, likely the big battery being bad was dragging down the electric system and causing the bugs while you ran off the small battery...

The regular battery and auxiliary batter are wired in parallel constantly.... ....meaning they can draw off each other.... ....this can cause some complications... ....I don't have the system, but what I've seen of it, you can disconnect either battery and isolate it pretty simply, just make sure you properly insulate the loose positive lead so it doesn't short and start a fire...
 

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So I’ve been getting a “Stop/Start not available Battery charging” message for a few months now. About every 3 or 4 days I’d have the message pop up for over an hour and often not go back to a normal “Stop/Start Ready” until it was turned off and restarted later for my commute home. It’s almost as if the battery is not holding a charge.

Went to dealer today for the cruise control recall and told them about my issue.

The dealer replaced the secondary battery saying it was shot. Jeep has 21k on it and is just under 2 years old.

I hate the Stop/Start feature but it’s well documented that when the secondary battery is really dead it causes all sorts of electrical issues.

So if the battery was the problem keeping an eye out for this message would be a good warning that the secondary battery is about to go.
My start/stop is working fine now. I did 2 things. 1) I use a trickle charger on my battery about once a week. and 2) I replaced the cabin A/C filter. The problem went away.
It is my understanding from the dealer that the Alternator does not charge the battery. Also, there is a temperature sensor in the HVAC system that will prevent start/stop from working under certain conditions. I was also surprised at how well the A/C now works.
 

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My start/stop is working fine now. I did 2 things. 1) I use a trickle charger on my battery about once a week. and 2) I replaced the cabin A/C filter. The problem went away.
It is my understanding from the dealer that the Alternator does not charge the battery. Also, there is a temperature sensor in the HVAC system that will prevent start/stop from working under certain conditions. I was also surprised at how well the A/C now works.
? The alternator charges the battery, otherwise, how else is the battery charged?
Is the positive cable of your auxiliary battery connected to the positive terminal of the larger battery and the same for negative? If so, then when your larger battery is charging so is your auxiliary battery....
Might you be confusing him saying when the engine is off at a stop with the ECC, the battery is draining and not being charged? Obviously, to much time at a stop in stop and go traffic, and not enough time cruising with the engine on to charge the battery would result in a net draining of the battery....

While doing a trickle charge on a battery is good and really does keep the battery in good condition longer, having to do it once a week is excessive, at least in the sense you shouldn't have to do that to keep the batteries in good order....

Yes, if the cabin air filter is clogged it will slow down the throughput of the HVAC and it does work better with a fresh filter vs an clogged/dirty filter....

As far as the HVAC temp sensor preventing ECC working, I'd imagine if its too warm in the cabin, and the AC compressor stops when the engine stops, the feature is there to keep the cabin cool and doesn't force you to sweat because you're in stop and go traffic....
 

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Here's another minor detail. My ESS, which is working fine now, still does NOT work if it's hot outside and the AC is on auto. If I turn the fan down a notch (heck maybe even up a notch, I don't know) so that it's not really in auto anymore - but the AC is still on - then ESS works.
 

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Here's another minor detail. My ESS, which is working fine now, still does NOT work if it's hot outside and the AC is on auto. If I turn the fan down a notch (heck maybe even up a notch, I don't know) so that it's not really in auto anymore - but the AC is still on - then ESS works.
Yea, I can't find anywhere, including the O.M. or FSM that has a good description on how the HVAC operates, especially when you put it in auto....
I've always got the impression the auto mode operates the AC at the lowest it can to maintain the temp you set....
But it does sound like the system is setup that if the cabin will go up in temp somewhat sitting at the light, then it doesn't shut down the motor when you come to a stop.....
 

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Ok mine started working, and I'm not sure why but will share my idea. To review, I was getting the not available and battery charging indicator. I had been charging it on trickle charge for a few days but nothing changed that. Today, I drove about 30 miles to a place and drove back home still not working. I just decided to try the auto start with the key fob. I hadn't really done this since I bought it. It started. I got in, saw the message saying to press the start button (not sure what that is all about but did it). Then backed out of garage, drove back in. After starting it again with the ignition button, I noticed the message was different. It no longer said "battery Charging" it just said auto "start/stop not available" so I backed out and drove around my long driveway and stopped at the mail box. It shut off.
My theory: I'm thinking that the auto start with key fob reset something letting the system know that it had enough charge to start on its own. If it was the trickle charge that did it, I will let it go a week or 2 without it and see if it loses the feature again.
 
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