Is it my battery?

[MojitoBullfrog]

My 2018 2.0L won't start. My brake won't push in, and my interior lights started flashing, even after I stopped trying to start it. My fuse box was making an odd ticking noise too which concerned me. I tried to give it a jumpstart but it didn't work. I assume my battery is just done since I believe the original battery is still in there, but I wanted to check before spending the money on one. Maybe the alternator ? Thanks!

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[NULL POINTER]

Sounds just like what happened to my 2018
JLUR this past week. Main battery was dead and I replaced it. System went crazy when I hooked up my NOCO GB70 jump starter. Main battery was original. I also replaced my AUX battery.

 

[MojitoBullfrog]

Did replacing the main battery fix the issue?

 

[19 JLUR Bright Whit3]

My 2018 2.0L won't start. My brake won't push in, and my interior lights started flashing, even after I stopped trying to start it. My fuse box was making an odd ticking noise too which concerned me. I tried to give it a jumpstart but it didn't work. I assume my battery is just done since I believe the original battery is still in there, but I wanted to check before spending the money on one. Maybe the alternator ? Thanks!

Yes. You've depleted both batteries. I would suggest replacing both. Did you not have ESS for a few months? Thats a sign that the aux. was dying. If you get to the point of just "clicks", your main is on its the way out too. Just my $.02

 

[NULL POINTER]

Did replacing the main battery fix the issue?

Yes. AUX was still good, but fully discharged trying to charge the main. I replaced the main battery first, and all was good. The next day I replaced the AUX anyway.

 

[MojitoBullfrog]

Yes. You've depleted both batteries. I would suggest replacing both. Did you not have ESS for a few months? Thats a sign that the aux. was dying. If you get to the point of just "clicks", your main is on its the way out too. Just my $.02

What is the ESS? And how do I go about replacing the AUX?

 

[19 JLUR Bright Whit3]

In layman's terms. Its the stop/start feature on JLs. We have two batteries. One maintains the starting of the vehicle and the other supplies power to your accessories while the vehicle is stopped.
The Aux is located in the passenger wheel well of the engine bay. Both kinda relies on the other. If youre not inclined to doing your own work, I've heard on here the dealer may replace them for free provided youre still covered under warranty. If not, It may cost you a pretty penny for the two batteries and shop cost at the dealer.

 

[NULL POINTER]

What is the ESS? And how do I go about replacing the AUX?

(5) Aux Battery replacement the easy way... pull the fender flare | Jeep Wrangler Forums (JL / JLU) - Rubicon, Sahara, Sport, 4xe, 392 - JLwranglerforums.com

 

[19 JLUR Bright Whit3]

What is the ESS? And how do I go about replacing the AUX?

Correction. I just saw that you have a 2.0 Turbo I am not familiar with that engine. I have a 3.6L and have two batteries. My apologies.

 

[bohnster]

What is the ESS? And how do I go about replacing the AUX?

Start here for battery info - applies to 2.0 as well

 

[dchemphill1]

Correction. I just saw that you have a 2.0 Turbo I am not familiar with that engine. I have a 3.6L and have two batteries. My apologies.

The 2.0 has two batteries as well....aux battery sits below the main battery. I had my aux replaced under warranty. If you do work yourself there are good YouTube videos on how to do this....can not mention the name of the person as they are banned from this site, he goes top down through fuse panel. The other has you go through wheel well.

 

[limeade]

What is the ESS? And how do I go about replacing the AUX?

Since you have a 2018 with the 2.0, you should have eTorque. With eTorque, you won't have an auxiliary battery for the Electronic Start Stop. The eTorque has a 48V battery pack under the cab on the driver side, which operates the ESS. In addition, eTorque engines don't have an alternator, they use a Belt Start Generator. Non eTorque engines have a small 12V battery underneath the main 12V starting battery.

If you're not sure what you have, look under the driver side. An eTorque equipped engine will have a skid plate covering this battery pack.

A big benefit to eTorque is not having to replace the auxiliary battery. The 48V battery pack is covered under the emissions 8 year/80,000 mile warranty.

 

[Rhinebeck01]

The 2.0 has two batteries as well....aux battery sits below the main battery. I had my aux replaced under warranty. If you do work yourself there are good YouTube videos on how to do this....can not mention the name of the person as they are banned from this site, he goes top down through fuse panel. The other has you go through wheel well.

@dchemphill1

I would never encourage anyone to do as the nitwit's video you mention says/shows, in regard to changing out the Aux battery.

Most guys / gals can get themselves into a very pricey mess if they go to change out the Aux by dismantling the Power Distribution Center (PDC) that is directly above the Aux battery. (Aux battery is not under the Main battery)

When you dismantle the PDC, you can easy damage/bend connectors, pins and more.

Very easy to have dirt fall into connector's, etc..
Also you chance breaking locking/retainer clips..

Anyway, best approach is to avoid dismantling the PDC if you do not absolutely have to....

..... and in this case for Aux battery change out you do not need to get anywhere near the PDC that if you damage could could very well cost you $1000+.

Best approach in regard to Aux change out is to do a fender liner peel or just to easy pull the whole fender flare. With either way you will pay a few $ for rivets/fender flare clips) but with absolutely no rusk of pricey damage to the PDC, etc..

Also.... takes a 30-40 minutes to do the peel of flare pull and well over an hour+ to properly do the PDC dismantle way..

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