Auto Stop/start issues

[Betttty White]

Hi forum! New guy here. We have. 2018 2dr wrangler with the 6cyl. Our jeep has 6k miles Md the past two days the clock on the radio is reset and the wrong time when we get in the jeep. Today when I pushed the dash stop start override button I got a symbol on the dash service the auto start soon- and the lights tarted dinging and blinking

what could this be???

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[eugeeezy]

you likely need a new battery or two.

 

[Betttty White]

I just replaced the main battery ,…. So the secondary one maybe??? Is that an involved job?

 

[eugeeezy]

not really. Go from underneath the fender.

https://www.jlwranglerforums.com/fo...ent-the-easy-way-pull-the-fender-flare.56807/

 

[TKL223/3]

I just replaced the main battery ,…. So the secondary one maybe??? Is that an invoked job?

When you replace any battery, it’s best that you replace both at the same time. There are tons of info on here regarding why.

 

[Betttty White]

Ok. Quick question because I can’t get this in til Friday. So will I be ok driving this with my new main battery as long as I don’t shut off the auto start start??

 

[Fudster]

Ok. Quick question because I can’t get this in til Friday. So will I be ok driving this with my new main battery as long as I don’t shut off the auto start start??

The state that the ESS off button is in, on or off, only prevents ESS from engaging if it otherwise normally would: itself only possible provided a checklist of items all prove true from a charged ESS battery, to a warm engine, to not being on a hill, to the steering wheel not being turned.

How the vehicle cranks, and the effects that a near dead battery has on the other its connected to in parallel is unaffected by the state this ESS off button is in.

You may wish to disconnect and bypass your ESS battery, either temporarily until you can get a replacement, or permanently if your not one to want ESS events from ocurring anyway.

A good method for doing this, but not the only method can be found here:

https://www.jlwranglerforums.com/forum/threads/jumperless-aux-battery-bypass.95945/

 

[dchemphill1]

You could also trickle charge at night until time can be found to replace the battery.

 

[Betttty White]

Trickle charge the main? Or the secondary

 

[aldo98229]

The way the dual battery setup works, pushing the ESS button will have little-to-no impact on the condition of the auxiliary battery.

You should be fine until weekend. In the meantime, just be prepared to see miscellaneous, seemingly-unrelated electronic gremlins pop up and go away.

Good luck.

 

[Fudster]

Trickle charge the main? Or the secondary

We are working on an assumption, which likely but not certainly is correct that your ESS battery needs replacement.

And we are of this belief because its age often negatively effects its ability to both accept and delivery charge--but we hope that ability is at least somewhat still intact.

Because of this I could find reason to put a charger only on the ESS battery or both.

We are concerned, as is the case when any batteries are connected in parallel like in your JL, that a bad battery (ESS) cannibalizes the good one (main), and by introducing a charger as a stop gap measure, in theory, it replaces the lost charge in the ESS battery or that lost in the main battery as the ESS battery drains from the main battery but doesn't itself much use that current to charge itself (because it's old and worn out.)

If you place the leads of a charger on the main battery of a dual AGM battery JL like yours it charges both batteries (because the batteries are connected in parallel.)

Alternatively, If you remove the factory cable on the negative terminal of the main battery that DOESN'T, on its distal end, connect to the body ground midway along the passenger's front quarter panel, i..e. disconnect the cable which has as its distal end the negative terminal of the ESS battery, then:

Placing your charger's positive lead on the positive terminal of the main battery (that is not a typo: I said main) and the charger's negative lead on the removed cable's loose end you will charge the ESS battery only. Make sure to put this cable back before cranking.****

If you are willing to go so far as to disconnect this cable, you can leave it's loose end wrapped up, and tucked away, and located the Power Distribution Center (PDC) a black box just below the hood and just in front of the passenger's seat. If you lift off its cover and remove Fuse 42 (what I linked prior) you will bypass the ESS battery.

Keep the fuse.


**** What if you don't reconnect the cable and don't remove the fuse. Well it depends. In early model 2018's (you have a 2018) without dealer downloaded software patch (i.e. TSB) 18-092-19 your JL wont' crank. Later 2018 production models and all dual AGM battery JL model years thereafter should fail on the first crank attempt, but subsequent cranks should go against the main battery.

If successful all future cranks will happen on the first attempt. The vehicle will turn the ESS off light on in the dash (the EVIC) and keep it illumincated until the next cold crank, if any, that a charged ESS battery is found at crank time.

@Betty White : we can better prescribe fixes to your problem with more knowledge of what you want. Do you want to use the ESS feature? Do you drive in a lot of stop and start traffic in Chicago where this feature saves some gas?

Because if not, the cost and effort of replacing the ESS battery is a waste. It's easier, cheaper, and more apropos in your case to simply bypass and disconnect the ESS battery if you have no desire to run ESS events, making the concern over it cannibalizing the main battery moot.

Keeping the vehicle in factory condition on a 2018, unless you have some extended warranty, is IMHO only necessary if you want to run ESS events.

 

[scj64]

OP; do you have a Tazer installed?

If so, there’s a manual shift supplement for getting the error you’re experiencing cleared.

 

[Curcurt]

I had the Auto/Stop Service Required message recently and everyone said it was the Aux battery. The dealer service tech read the error code and all I had was bent pins in the driver's door wiring harness connector. Simple fix. Tech says they see bent pins in a lot of the JLs.

 

[Betttty White]

Took it in the secondary battery was dead.

 

[Betttty White]

Got the battery replaced. Now the issue is when the jeep sits overnight and we get in the vehicle in the morning the clock shows the wrong time. Any ideas why?

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