ESS Stopped Working - JeepForum.com
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post #1 of 106 Old 01-09-2020, 02:05 PM Thread Starter
RicKaysen
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ESS Stopped Working

2019 JGC High Altitude with only 3800 miles. The ESS no longer stops the engine when I pull up to a light. I know many hate the feature, and it's no major inconvenience that it's gone, but I'd kinda like to know the possible causes. Weather here in Southern Nevada is mild, so not using AC or max heat. What should I look for before a dreaded dealer visit.

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post #2 of 106 Old 01-09-2020, 03:00 PM
ColdCase
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From reading posts here, sometimes ESS seems to stop working for while, perhaps because of a low ESS battery. Have you only been taking short trips. Do you get an ESS not working warning?

ESS won't activate if the battery health monitor integrated with the batter+ cable is unhappy or faulty. But you should get some kind of status message.

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post #3 of 106 Old 01-09-2020, 09:28 PM
Rags722
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Good luck! My 2019 with under 1,600 miles on it just started giving me battery charging warnings. While I dislike the system, it's no big deal to just push the button at the start of each ride. However, I am not happy about it indicating a battery issue. Took it to the dealer, they replaced the ESS battery, claimed the main battery was low and deep charged that as well. 2 days later, ESS is out again with battery charging warning. Winter in PA, but not cold enough to kill 2 batteries in a week! I started a thread on this earlier today.
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post #4 of 106 Old 01-09-2020, 09:56 PM
ColdCase
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Its possible the alternator is not performing well, or the battery monitor is faulty and not turning on the alternator enough. The newer models have a power management strategy and components which seem to be finicky. (Its not charging the battery all the time and using smarter charging controls to save a few tenths of mpg)

After the batery swap not working, the dealer should dig deeper. But most techs are not all that familiar with the newer power management stuff. I think some have found a poor/loose connection at the battery. I think there is a fairly recent thread around here somewhere, when I get a chance I'll look for it as I don't recall all the details.

I was born with nuttin' and I still have most of it
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #5 of 106 Old 01-10-2020, 08:46 AM Thread Starter
RicKaysen
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I appreciate the suggestions. Lately most of my trips have been less that 5 miles since I work from home but I'm not getting any battery warnings though.
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post #6 of 106 Old 01-11-2020, 09:31 AM
Nejeep
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Here is a video showing how to determine which operating condition is preventing your ESS from working, using the control buttons on the steering wheel.

19 Limited 4x4 3.6 White/Tan new daily driver
06 Laredo for 11 years
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post #7 of 106 Old 01-11-2020, 11:31 AM Thread Starter
RicKaysen
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Thanks for the video...great information.
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post #8 of 106 Old 01-13-2020, 09:32 AM
CrimsonGhost
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Great video, but why is he driving with his left foot?

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post #9 of 106 Old 01-13-2020, 06:57 PM Thread Starter
RicKaysen
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So... Message on the display says start stop not available - battery charging. Dealer wants me to leave it with them to "diagnose".
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post #10 of 106 Old 01-14-2020, 07:20 AM
CrimsonGhost
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Mine stopped working in December and I have the same message. Battery Charging. I don't miss it, but I don't like having things not working that should be.

2014 Black GC Laredo - Retired
2015 Blue GC Limited - Retired
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post #11 of 106 Old 01-14-2020, 10:52 AM
DallasJGC17
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My ESS stopped working, but no error message. Any thoughts about what might be happening? Is the battery likely to go dead without warning?
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post #12 of 106 Old 01-14-2020, 11:25 AM
ColdCase
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The ESS battery is only used to keep the computers happy when the engine is not running and the computer will not activate start/stop if there is not enough capacity there. The ESS battery can go bad without warning, but you should get the start/stop not available message. The main battery, being AGM type, can also fail without warning.

I was born with nuttin' and I still have most of it
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #13 of 106 Old 01-15-2020, 06:40 AM
Rags722
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Quote:
Originally Posted by DallasJGC17 View Post
My ESS stopped working, but no error message. Any thoughts about what might be happening? Is the battery likely to go dead without warning?
To get a message you need to go to the dash board controls and select the screen with the A in it. That will give you the Automatic stop (ESS) status in the center of the speedometer.
img_0781.jpg
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post #14 of 106 Old 01-15-2020, 06:44 AM
Nejeep
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My '19 Limited ESS only works after longer highway trips at least during these winter months. The ESS display says Not Ready Battery Charging but no fault message or lite. Its usually driven on shorter city trips so likely not getting charged enough. After a recent 300 mile highway trip it did work for a few days but now is back to Not Ready Battery Charging. The ESS did work normally until the colder weather arrived in December.

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post #15 of 106 Old 01-15-2020, 06:47 AM
Rags722
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Quote:
Originally Posted by CrimsonGhost View Post
Mine stopped working in December and I have the same message. Battery Charging. I don't miss it, but I don't like having things not working that should be.
Since I viewed the video, I noticed 2 other items that will keep ESS from working... Battery to Hot or Battery to cold. One would think a few days in the 20's ~ 30's would not be an issue, but I have to wonder if cold is the issue with all the recent comments. If so, I still don't understand why the dealership replaced a battery. For what it's worth, my symptoms have changed. Some days it says battery charging, other days ( during our recent heat wave in PA in January) it works just fine. Battery charging when I shut it off , next day fires right up as soon as the cabin air and motor warnings go away. I'm starting to think it's an under designed system that might be giving false "error" messages. That still does not explain away changing a good battery. Think I'll leave it alone until spring and see if it fixes itself....
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