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  1. Help, JLU Rubicon Traction Control turns itself off if ESS is ON.

    So, I've been having this problem every time I go wheeling lately. Once I get back to pavement and I go to turn traction control back on it will turn on initially, but when I stop and the engine shuts off with the automatic start stop the traction control turns it self back off as soon as the...
  2. My ESS has more excuses than my 8 year old

    The system previously threw warnings to service the ESS. Taken to the dealer under warranty and they did a software update. It no longer tells me to service the system but has not worked once since the update. It seems it has a full list of excuses of why it is not working instead. I really...
  3. Tazer JL & Mopar AUX Switch/ESS Issue

    Hey everyone, I have a rather strange issue that I have not seen elsewhere on the forum that I am hoping someone can help with. I just installed the Mopar AUX switch kit in my 2019 JLU and I used the Tazer JL (version 11.1.5) to enable the switches in the Uconnect menu. Double checked my work...
  4. ESS Failure... 2nd Occurrence

    Hi everyone, I have a 2020 Unlimited Rubicon with the EcoDiesel engine. The issue: When stopped in traffic, the ESS system did as designed shutting the engine off. When the light turned green and releasing the brake, the engine did not turn on. Hitting the gas multiple times did nothing...
  5. 3.6L ESS Bad Aux Battery No Start Firmware Fix

    When my 2018 JLU was at the dealers for the steering stabilizer recall, I asked about updating the radio firmware to fix some issues I was having (5" radio). They updated the PCM, ABS and radio firmware. Yesterday I noticed the low speed surging was gone, so today I tested starting with aux...
  6. Is a supplemental/ESS/aux battery jumpstart dangerous?

    A few days ago a picture was posted on another thread (https://www.jlwranglerforums.com/forum/threads/quirks-not-addressed-in-user-guide.40684/page-6#post-922367) that showed a jump start related addendum to the owners manual that states "Only use the positive battery post on the main battery...
  7. ESS Noise

    Anyone able to let me know if this sounds normal? The (winding down/up, clicking) noise, almost sounds like a hard drive or something. It must be coming from the ESS system as I do not hear this when I turn it off.
  8. Service ESS and ESC on brand new 2019 JLU

    So i brought my 2019 Wrangler Rubicon with 15 miles yesterday and before even driving off the lot i noticed a light which at the time i didn't know what it meant so didn't pay much attention to it. When i got home i looked it up and noticed it was the service ESS light and the service ESC light...
  9. ESS Battery Underhood and Management Diagram

    This new diagram is based on the appearance and location of the different components under the hood. I'm open to suggestions that would help with the readability/usability. For those that aren't aware, there are several 3.6L ESS threads in the 3.6L Engine forum if you're looking for more ESS...
  10. 3.6L ESS Cold Start

    (Disclaimer: Theories regarding the 3.6L ESS starting process are educated guesses, here's mine.) After months of people suggesting that the PCR separates the batteries before a cold start, I finally tested this several weeks ago. I found that the PCR is activated for a very brief instant...
  11. ESS Not Ready, Steep Grade on flat ground, pitch 6°

    Need help; When I was driving my Wrangler today I noticed that ESS wasn't working as usual, so I went into menus to check ESS message and it says due to steep grade, so I went to check Pitch & Roll and it was showing 6° on level ground. I was on my way to work so I dropped it off at the nearest...
  12. Like or hate ESS on 3.6 vs 2.0

    I have been trying to get a read on if there is a difference between the 3.6 and the 2.0T regarding the ESS system. My suspicion is that the 2.0T system works better than on the 3.6. Folks seem diametrically opposed in their thoughts on ESS and I wonder if that's due to different experiences in...
  13. 3.6L ESS Dual Battery Consolidated Information

    Due to the quantity and length of ESS battery and electrical related threads, researching issues can be time consuming and confusing. I am using this post to make information and related links easily available. This first post will serve as a quick reference and I'll use the second post to...
  14. Disengage Engine Stop-Start (ESS)

    Hey there, Not sure if this should be located here, but has an option to permanently disengage the Enginer Stop-Start (ESS) been implemented in way that wont void my warranty? Thank you!
  15. JLUR Dead Battery (Update-Im told bad alternator)

    This is a short story. Came back from a two week vacation and went to use the JLUR today only to realize it was 100% dead. No electrical sign of any kind. The vehicle never had electrical issues before and has always been in the garage. Weather here in Chicago has been pretty cold and snowy...
  16. 3.6L ESS IBS Information

    I thought I'd start this thread for discussing the operation of the IBS. First is a link to the technical description of the IBS from Bosch. The rest of the post is my interpretations and observations...
  17. 3.6L ESS Battery Basics

    I have observed that there may be a need for some basic ESS based electrical theory. For those that struggle to understand how electricity works, some basic electrical concepts can be better understood by using basic plumbing concepts. Substituting water for electricity, pipes for wire and water...
  18. Christmas Lights on cluster

    I am having an issue with my 2018 JLU Sahara. I purchased it new off the lot with 6 miles on it. When I left the dealership (David Stanley in OKC), it had the check engine light on, ABS light on, traction control light was on, the ESS wouldn't engage, the cruise control would not work, 4wd...
  19. 3.6L ESS Aux Battery Bypass

    I've seen quite a few posts related to failed Aux batteries causing flaky or dead electronics, stalling and failing to start/auto restart. I've come up with a simple way to temporarily bypass a bad Aux battery (also blown PCR fuse or bad PCR) and get back on the road. Warning - this post...
  20. ESS - The data behind fuel consumption (really interesting video)

    So, this video explains a study that was done to compare how much fuel is used by idling your car (say at a stoplight or train track) vs. shutting off and restarting the engine (for example, using an ESS system). It turns out that there is some pretty good evidence to suggest that using an ESS...



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