ess battery

I have a 2022 JLR 2.0 that I have now owned 38 months and have 23k miles on it. I have the tow package with the upgraded battery and alternator. I know 3 years is typically when the auxiliary batteries fail. I have had no issues and typically I’m between 13.8 and 14.4 volts while the engine is...

Intermittent starting on 18 Sahara 2 liter 4 cylinder turbocharged. Has a e torque with 12v battery and 48 v for mid hybrid operations/ no auxiliary battery. Started and rolled out of driveway fine stopped and checked tires for nails and such, went to restart dead/ had to try 5x finally started...

Even though this is not on a Wrangler JL the ESS system is still the same. I'm not an electronics expert but I like to play around with things, and try out 12v things other may not have tried yet. Nearly 2 years ago I purchased an automotive grade Lifepo4e battery and was going to use it in...

This issue has been touched many times here, but none of the solutions have worked for me. A good while ago, my 2021 Rubicon (purchased Nov 2020, currently 29k miles) started requiring 2 attempts to start the engine. I'll attach a video of what happens EVERY time, but everything cranks...

I’ve tried looking for answers but can’t quite find what I'm experiencing. Last week my Jeep (2018 JLU 2.0 eTorque) while I was in traffic, threw up an “auto start/stop stopped working” message. Yellow @!. Then when that occurred the jeep began to shake as it was in idle. I then stepped on the...

2020 Jeep Jl Rubicon. No Ess unless I trickle charge it overnight. Took it into the dealership but they said the batteries tested fine……still no Ess. They did nothing. Back to the trickle charge. I may pull the battery myself and check it with a load. Then take it to Auto Zone to have it tested...

I have a 2020 JL WITHOUT the factory LED package, so I purchased the Oracle headlights with the halo. I wired them to the recommended fuse plug. Do any of you guys know if that would affect the auto start/stop (ESS) system or drain the secondary battery. I was thinking maybe it was wearing out...

I have a 2019 JLU Sport S 3.6 Manual - ESS stopped working a few weeks ago, which was fine with me...first thing I do is turn ESS off. But then I read (on here maybe?) that it could indicate a problem with one or both batteries and/or my alternator. So I took it in while it was still under...

Has anyone thought about adding a battery isolator to the existing factory dual battery configuration? Is it possible? Problem - the factory system does not protect each battery from the other. So, if one battery fails the other follows not far behind. This happens on a regular basis from the...

Checking the voltage of the batteries is a good start, but a battery with good voltage can still fail when under a load. To really test the batteries, you need a load tester. Some auto parts stores will load test your battery for you, but having dual batteries complicates the testing. To do my...

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...

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...

Here's my attempt at a diagram that illustrates the battery connections for the 3.6L ESS dual batteries. Hopefully this will help make sense of why things work the way they do. I tried to show that when you pull the battery terminals off of the battery, there is still an electrical connection...