Stop/Start Not Ready-Battery Charging

[JLJeepGuy513]

Dropped it off at the dealer again this morning. Will update when i get it back later today.

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[WranglerMan]

The voltage you see displayed in the EVIC is kind of misunderstood, if the Jeep is running the voltage displayed includes what the alternator is putting out and with the charging algorithm design this displayed voltage will vary from 12.8-14.4 depending on what’s needed to charge.

If you want to check the battery voltages separately all you do is pull the ESS battery negative off the main Negative post then put your meter leads on the main battery post and negative on the negative post and this will give you the static charge of the main then while leaving the positive on the main put the negative lead on the ESS negative lead you disconnected and this will be the state of the ESS battery, both should be in the 12.65 range

The JL uses a charging system that only allows the alternator to put out what is needed to maintain the batteries and if the batteries are low or bad then the IBS ( intelligent battery sensor ) monitors these voltages and allows the alternator to do what is needed but as the batteries become more and more charged the voltage displayed should show less and less but usually not below 12.8 unless your batteries were recently charged, I put my JL on a tender once a month just to keep the batteries at peak charge as it stays parked a lot.

My guess is the main or both batteries are defective and once replaced will be good to go, my main was replaced after 7 months and so far so good.

 

[JLJeepGuy513]

The voltage you see displayed in the EVIC is kind of misunderstood, if the Jeep is running the voltage displayed includes what the alternator is putting out and with the charging algorithm design this displayed voltage will vary from 12.8-14.4 depending on what’s needed to charge.

If you want to check the battery voltages separately all you do is pull the ESS battery negative off the main Negative post then put your meter leads on the main battery post and negative on the negative post and this will give you the static charge of the main then while leaving the positive on the main put the negative lead on the ESS negative lead you disconnected and this will be the state of the ESS battery, both should be in the 12.65 range

The JL uses a charging system that only allows the alternator to put out what is needed to maintain the batteries and if the batteries are low or bad then the IBS ( intelligent battery sensor ) monitors these voltages and allows the alternator to do what is needed but as the batteries become more and more charged the voltage displayed should show less and less but usually not below 12.8 unless your batteries were recently charged, I put my JL on a tender once a month just to keep the batteries at peak charge as it stays parked a lot.

My guess is the main or both batteries are defective and once replaced will be good to go, my main was replaced after 7 months and so far so good.

This was exactly what i was looking for earlier! Its in shop now anyways, but good to know for future reference. Thanks!

 

[WranglerMan]

This was exactly what i was looking for earlier! Its in shop now anyways, but good to know for future reference. Thanks!

Here is a good read by @Jebiruph, he has gone above and beyond on this whole battery issue and I have learned a ton from him

https://www.jlwranglerforums.com/forum/threads/3-6l-ess-aux-battery-bypass.17293/

https://www.jlwranglerforums.com/forum/threads/3-6l-ess-dual-battery-consolidated-information.25377/

 

[JeepCares]

Dropped it off at the dealer again this morning. Will update when i get it back later today.

We hope your appointment goes well, JLJeepGuy513. We're available via private message if you need any additional assistance.

Lydia
Jeep Social Care Specialist

 

[JLJeepGuy513]

Just got the Jeep back from dealer. They replaced both batteries and all is good again.

 

[beans69]

Hello Everyone,
Having same issue on my 2 week old 2018 Sahara, BUT dealership already replaced both batteries (the ESS battery on the day I bought it 2 weeks ago and the Main battery today). The ESS system has never worked in my vehicle, dealer is contacting "Chrysler Engineering" tomorrow AM. Should I be concerned?

 

[timn1984]

Hello Everyone,
Having same issue on my 2 week old 2018 Sahara, BUT dealership already replaced both batteries (the ESS battery on the day I bought it 2 weeks ago and the Main battery today). The ESS system has never worked in my vehicle, dealer is contacting "Chrysler Engineering" tomorrow AM. Should I be concerned?

Maybe not, the batteries may have been bad. I do know that bad batteries were a problem. I had mine replace last spring, bought my Sahara 2018 in Oct 2018. I would have them check the new batteries and make sure they are holding a charge.

 

[JeepCares]

Hello Everyone,
Having same issue on my 2 week old 2018 Sahara, BUT dealership already replaced both batteries (the ESS battery on the day I bought it 2 weeks ago and the Main battery today). The ESS system has never worked in my vehicle, dealer is contacting "Chrysler Engineering" tomorrow AM. Should I be concerned?

Hi beans69,
We certainly understand why this may be concerning. Has a case been opened on the Customer Care side to add additional assistance while working with your dealer? If not, please send our team a private message and we would be happy to get this started for you!
Alex
Jeep Social Care Specialist

 

[johnparjr]

Reviving an old thread as my Jeep is now showing me this and the ESS hasn’t worked in a week I have an appointment tomorrow

 

[BrntWS6]

I get this message a lot, but mine is not a DD. Took it to the dealer for the 3hr battery test just to make sure and everything was okay. This system is just not efficient, if i let the jeep sit 24hrs it will take 2-3hrs of driving for the ESS to engage again. Only thing that helps is keeping it on a trickle charge.

 

[FirstF80InSpace]

This may or may not be related to battery efficiency, but once when I was waiting in my car for about an hour, I would notice that every so often, the display would turn on and then turn off. If this is a normal thing because of things going on in the background, this can explain one reason for parasitic drain on the battery.

 

[johnparjr]

Dealer is replacing both batteries under warranty

 

[TexCin]

The ESS stopped working about two weeks ago on my 2018 JL. Jeep was in the shop from last Saturday until Wednesday. I picked it up and the message on the screen was the same as when I dropped it off (Stop/Start Not Ready Battery Charging). They told me it would require driving a little while for the aux battery to be fully charged and then the message would disappear and the ESS would function properly. Nope. Drove for 40 minutes at freeway speeds and it still didn't change and ESS still isn't working. Then they told me that I must not be in reaching the "correct conditions" for the ESS to engage. That is garbage. The Cherokee I've been driving while mine is in the shop kicks in just like my Jeep JL used to and in the same places on my commute. Back to the dealer.

 

[johnparjr]

The ESS stopped working about two weeks ago on my 2018 JL. Jeep was in the shop from last Saturday until Wednesday. I picked it up and the message on the screen was the same as when I dropped it off (Stop/Start Not Ready Battery Charging). They told me it would require driving a little while for the aux battery to be fully charged and then the message would disappear and the ESS would function properly. Nope. Drove for 40 minutes at freeway speeds and it still didn't change and ESS still isn't working. Then they told me that I must not be in reaching the "correct conditions" for the ESS to engage. That is garbage. The Cherokee I've been driving while mine is in the shop kicks in just like my Jeep JL used to and in the same places on my commute. Back to the dealer.

My dealer said give it a week but it cleared up in about 20 minutes on the freeway

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