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MeanPeachMojito

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Seeing as there is little in the way of troubleshooting here I thought I would contribute my analysis on this. Being a victim as well, here is what I think happens and the culprit.
Just before it happened to me, I clicked in my seat belt. This sets up for one of the requirements for the start/stop option to engage.

Now, when the start/stop engages, the main battery stops producing power and the aux 12v battery takes over and supplies power to all the accessories and interior/exterior lighting.

Once the brake is released, the system should go back to main battery power. When this problem occurs, a 150amp fuse blows on the fuse bar that connects to the aux battery under the fuse box, causing it never to go back to regular battery power, but remains on the aux battery

This failure causes the dash panel battery light to stay on, because it hasn't switched back from the aux battery

Also, if you watch the aux battery weaken to a slow death, and have an accessory plugged into the glove box USB port, you will notice the accessory will continue to work. In my case it was a phone charger. The charger was charging off of the main battery and not a receptacle that draws from the aux battery.

The dealer said they replaced the 150 amp fuse on the fuse bar and replaced the aux battery because it wouldn't take a charge, further pointing to the aux battery never switching back to main power.

Based on all the indications, the service managers responses, the sequence of occurrences, I think its a failure of the start/stop switching mechanism that causes this problem......now I turn it off as soon as I get in. There are ways to bypass, and there are youtube videos out there to do that, but I'll keep doing this until I think a bypass is better than shutting it off every time I get in.
I hope that fixes your problem. In my case, I could never relate the issue triggering at a specific time/action. Being that it happened so many times, my husband and I both would take as many notes as we could each time we fell victim to the alert. One time we thought it was because he was simultaneously breaking, turning and powering down his drivers window to card swipe into a parking lot. But there was never any way to replicate it. Eventually, the dealership mechanic had the Jeep fail completely while he was driving it. Being that he is a mechanic, he was able to note all kinds of things we wouldn't pay attention to. He immediately got it into the shop and hooked it up to the machines, which led them to replacing the PCM.
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JimLee

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On Saturday June 1st The same error appeared for me, I donā€™t like people touching my cars or for this matter my Jeep, so I did some digging around and found my main battery was dead with my fluke meter, I tore apart that side to gain access to the aux battery to test it with the fluke as well and that was dead also so I bought new batteries and installed them and when put back together it still didnā€™t crank up so I did a little more digging around the fuse box and checked my fuses in the fuse box and all was good except one on the main fuse bus bar that connects to the edge of the fuse box, for me it was lug ā€œnumber 3ā€ that was blown when I was checking for continuity, I bought a new main bus bar fuse and installed it and Jeep started right up.... if you donā€™t want to go digging around and ripping things apart I looked at the battery schematic thatā€™s posted on this site and it shows that lug 3 is the positive connection for the aux battery, so I would disconnect #3, lift it off WITHOUT touching any bare metal and use a fluke meter to either ground or the negative to see what voltage u get on the battery the lugs bolt is a size 10mm FYI

4E6E7D5C-241E-446F-9257-DD0E3256D18E.png


A4CBD6FE-43FA-49FB-9364-28C53D14076B.jpeg


This is the main bus bar fuse that I bought and replaced
I carry a spare in my glovebox, I get way too far out in nowhere to let one of these strand me. Too bad I can't mitigate the risk of the 400 other JL "features" that might leave me stranded. I also have a good pair of hiking boots that live in my JL.
 

Sippican

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I hope that fixes your problem. In my case, I could never relate the issue triggering at a specific time/action. Being that it happened so many times, my husband and I both would take as many notes as we could each time we fell victim to the alert. One time we thought it was because he was simultaneously breaking, turning and powering down his drivers window to card swipe into a parking lot. But there was never any way to replicate it. Eventually, the dealership mechanic had the Jeep fail completely while he was driving it. Being that he is a mechanic, he was able to note all kinds of things we wouldn't pay attention to. He immediately got it into the shop and hooked it up to the machines, which led them to replacing the PCM.


So did it fix it?
 

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Sippican

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Yes, the ESS was enabled. I've had it back for about 3 weeks and 750 miles. :fingerscrossed:
I've been disabling ESS....lets see what happens....if reliability is questionable, and it happens 3 times, I'm taking advantage of the Massachusetts Lemon Law and turn it in. I have to feel comfortable with reliability.
 

Just Jeep

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My Jeep just did this to me yesterday, I had to tow it to the dealer today . I only had the jeep for about 6 months. Bad thing was it happen while I was driving and I lost power and tried move to get out of traffic and ended up running on a curb messing up my new rims I just put on the Jeep.! @#$#$%%$# The dealer is saying since I don't have a appointment that it will be a week before they can look at it. I was so excited but this has taken the joy of owning the vehicle away from me. I hope its a easy fix but from the look of this tread I am worried.......
Update i have had my Jeep back from the dealer ship for about 3 weeks now and it seems to be fine. They attributed my issue to something that wasn't ground properly. They said I had some AUX lights that were grounded directly to the negative post on the battery and that was causing my alternator to over heat and it pop a fuse. They grounded everything properly and I'm good 3 weeks in......
 

Taktix1

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Any updates from anyone who had this issue? Is everything still working properly?
 

four low

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Update i have had my Jeep back from the dealer ship for about 3 weeks now and it seems to be fine. They attributed my issue to something that wasn't ground properly. They said I had some AUX lights that were grounded directly to the negative post on the battery and that was causing my alternator to over heat and it pop a fuse. They grounded everything properly and I'm good 3 weeks in......
Ok, so the whole issue was due to improperly grounded owner installed accessories, NOT a vehicle flaw, or warranty issue. Important Detail....
 

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m3lover1

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This just showed up for me today. I just got my JLUR this past Saturday, with 330 miles so far. I made it to restaurant no problem, and looked up this thread during dinner, which of course made me very nervous. Upon startup the start stop is working normally, the message doesn't show up anymore. I turned off start stop and drove for a while and the message never showed up. Went to Grandma's, played some fortnite Monopoly with cousin. Upon leaving started up fine, no error message telling me to stop driving, and even turned on the auto start stop and still nothing.

Weird...
 

JeepCares

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This just showed up for me today. I just got my JLUR this past Saturday, with 330 miles so far. I made it to restaurant no problem, and looked up this thread during dinner, which of course made me very nervous. Upon startup the start stop is working normally, the message doesn't show up anymore. I turned off start stop and drove for a while and the message never showed up. Went to Grandma's, played some fortnite Monopoly with cousin. Upon leaving started up fine, no error message telling me to stop driving, and even turned on the auto start stop and still nothing.

Weird...
Hi m3lover1,
If this continues to happen and you decide to have your dealer address this, please send our team a private message. We would be happy to connect you with a case specialist to assist throughout this process.
Alex
Jeep Social Care Specialist
 

m3lover1

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Hi m3lover1,
If this continues to happen and you decide to have your dealer address this, please send our team a private message. We would be happy to connect you with a case specialist to assist throughout this process.
Alex
Jeep Social Care Specialist
Sounds good @JeepCares. Thanks. I'll keep monitoring this week, and if it happens again I'll head to dealership and also PM you.
 

aprez27

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Well my Jeep left me stranded a few months ago with the same issue. And the autostart stop hasnā€™t worked since I got it back and I didnā€™t really care. Now Iā€™m 70 miles away from home went out to start the Jeep 5 minutes after turning it off and wouldnā€™t start. Had a humming sound coming from under the hood on the drivers side that wouldnā€™t go away even after disconnecting the battery, I had to disconnect the main ground to get that to stop as well as the headlights to turn off. Was able to jump start it but then that message came up about pulling over the Jeep will shut off soon. About to attempt the 70 mile trip back home, wish me luck or talk me out of it.
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