Start/Stop Not Ready Battery Charging?

[MJS]

2020 Wrangler showing this message. The battery is fine. Does anyone else have this issue?

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[Bob Burd]

Not uncommon if most of your driving is relatively short distances. A longer drive (more than 2 hrs, say) should take care of charging it up. I've gotten this along with "Battery Protection Mode" recently in temps under 45F. Both go away after a long drive. My main battery is 2yrs old now (aux battery only 6mo), so it may be showing wear even though it tests fine with a load tester.

 

[Yawnie'sPapa]

2020 Wrangler showing this message. The battery is fine. Does anyone else have this issue?

Why/how do you say battery is fine?
You know you have two, correct?
Did you check the voltage?
Did you check each battery's voltage independently?
If they aren't 12.7 volts, then they aren't 100% charged. 12.4 or less tends to show this message.
If you don't drive daily, or you don't drive over 30 minutes a day, they won't stay charged up.

You need to check the voltage.
Then - disconnect the negative cables from the main battery, separate the two negative cables.
For a 2020, the top cable should be the ground cable for the aux battery hidden under the PDC.
You can connect a volt meter to that negative cable and to the positive of the main battery and check the aux battery voltage that way.
Check each battery.
Use a good AGM charger (a real charger, not a 2 amp or less tender or maintainer) charge each battery independently.
With them disconnected, check the voltage of each battery after a few minutes. they should read at least 12.7 if they took a full charge.
Reset the IBS.
When done charging the batteries, and having let the IBS sit disconnected from the main battery for 10 to 15 minutes, put it all back together.

Unless you checked the battery voltage - then checked each battery by itself, you can't say both are good.
Frankly, a 2020 means 3 year old batteries and that's about it for these.
Especially if you don't drive it regular, and don't drive for long enough times. Batteries with reduced charge don't last as long.
That's really low miles for a 3 year old vehicle - and that alone suggests to me your batteries are needing to be at least load tested (only after a full charge of each) and likely replaced. Those miles indicate infrequent and/or short drives, reducing battery life.

 

[MJS]

Thanks for the details. It goes to the shop for corrosion paint correction next week. It helps to have some knowledge going in. Let ya know what they say.

 

[CaptStarboard]

Why/how do you say battery is fine?
You know you have two, correct?
Did you check the voltage?
Did you check each battery's voltage independently?
If they aren't 12.7 volts, then they aren't 100% charged. 12.4 or less tends to show this message.
If you don't drive daily, or you don't drive over 30 minutes a day, they won't stay charged up.

You need to check the voltage.
Then - disconnect the negative cables from the main battery, separate the two negative cables.
For a 2020, the top cable should be the ground cable for the aux battery hidden under the PDC.
You can connect a volt meter to that negative cable and to the positive of the main battery and check the aux battery voltage that way.
Check each battery.
Use a good AGM charger (a real charger, not a 2 amp or less tender or maintainer) charge each battery independently.
With them disconnected, check the voltage of each battery after a few minutes. they should read at least 12.7 if they took a full charge.
Reset the IBS.
When done charging the batteries, and having let the IBS sit disconnected from the main battery for 10 to 15 minutes, put it all back together.

Unless you checked the battery voltage - then checked each battery by itself, you can't say both are good.
Frankly, a 2020 means 3 year old batteries and that's about it for these.
Especially if you don't drive it regular, and don't drive for long enough times. Batteries with reduced charge don't last as long.
That's really low miles for a 3 year old vehicle - and that alone suggests to me your batteries are needing to be at least load tested (only after a full charge of each) and likely replaced. Those miles indicate infrequent and/or short drives, reducing battery life.

AGREE!

my 2020 Export Diesel Rubi had the batteries only last two years. Replaced both before our 7500 km Cape York trip last Sept. even once replaced, the batteries will only hold in the low 12.1-12.2 after a night or two in the garage!

jeep dealer has checked this twice and still trying to feed me BS that this is normal. I keep pushing back. Auto electrician discusses smart alternators quickly reduce charge to keep fuel economy up. But shouldn’t this profile at least fully charge the batteries before significantly ramping down?

Maybe this brain trust can suggest a few things!? Thoughts of possible parasitic things draining battery:

things added before the big trip and start of battery issues
1.) added Warn evo 10S
2.)Tazer JL Mini, constantly plugged in
3,) STEDI Driving lights on bumper and four cube lights on cowl

any thoughts appreciated,

Thanks CaptStarboard

 

[Fudster]

As I read this thread I find some analogy to the somewhat elderly (the batteries) and sedentary (the mileage) patient being treated by two doctors, neither wrong (@Bob Burd and @Yawnie'sPapa) but with contrasting approaches.

@Bob Burd suggest the "take it out for a spin to see if it charges the batteries," which I agree with as an initial step, along with trickle charging, while @Yawnie'sPapa advice, all diagnostically sound, suggests the initially performance of a battery (no pun intended) of tests on batteries, that unless changed since purchase, are approaching their 3 year mark for replacement.

I say try @Bob Burd's advice first and if not helpful, weight the costs of @Yawnie'sPapa's advice with the cost of battery replacement.

 

[dchemphill1]

Remove the Aux battery...lots of threads on how to do it...a poor Aux will pull down main battery. I have been running this way for 7 months and no issues. Don't do this if you like the start stop feature.

 

[MJS]

My shop confirmed both of the batteries are shot. My Jeep is out of warranty for the batteries but they are replacing them at no cost to me. Angelena at AutoLand in Springfield NJ is the best! They are also sorting out my corrosion issue.

 

[SouthernJL]

Hey folks, I have a 2021 JLUR, 22,000 miles. I've had it exactly 2 years as of this month. I too am now having an issue with the battery not remaining charged. Since I'm still under warranty, I intent to make an appt with the dealership to have 1 or both batteries replaced.

I currently have a tazer mini married to the vehicle. Should I un-marry the tazer before taking it to the dealership? Or is the tazer being coupled with the vehicle so completely unrelated to the battery issue that I don't have to worry about them giving me grief about if/when they discover the tazer in the Jeep?

 

[Fudster]

Hey folks, I have a 2021 JLUR, 22,000 miles. I've had it exactly 2 years as of this month. I too am now having an issue with the battery not remaining charged. Since I'm still under warranty, I intent to make an appt with the dealership to have 1 or both batteries replaced.

I currently have a tazer mini married to the vehicle. Should I un-marry the tazer before taking it to the dealership? Or is the tazer being coupled with the vehicle so completely unrelated to the battery issue that I don't have to worry about them giving me grief about if/when they discover the tazer in the Jeep?

Unmarrying the tazer before taking it to the dealer is just something you should, and for many dealers, just need to do.

 

[SouthernJL]

Unmarrying the tazer before taking it to the dealer is just something you should, and for many dealers, just need to do.

Thanks for the advice. I guess I will unmarry it before taking to the dealership.

 

[BallisticBurrito]

I have a 2019 (built in tail end of '18) that is stuck in the forever 'battery charging' state. The AUX was replaced last year and still have the original main.

Both batteries test good when isolated with a analog load tester, digital multimeter and digital battery tester I bought (volts, CCA, state of charge, etc.)

I even went crazy and bought a dual battery charger so I can charge both batteries separately. Trickled both of them (disconnected from eachother) at 1.5amps each until 100%. Tested again after with the digital tester and it said both were good. Slapped them back together and still says battery charging.

Now trying the IBS reset. I actually like the ESS and want it back, dammit. A lot of red lights on the commute to and from work and I like the 3+ MPG average I get from it.

 

[Kristian]

Has anyone seen this on an e-torque motor? My 2020 Rubi/recon 2.0 is showing me the "Stop/start not ready," but does not show the "Battery charging" indicator.

 

[Bob Burd]

Lots of things can pause stop/start, not just weak batteries.

 

[CMTAZ]

2 previous wranglers had this issue, in both cases it was fixed by replacing both batteries.

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