Complete electrical failure - stuck in "run"

[andwew]

Hello-
My 2018 JLUR has been completely falling apart lately. At first it had a couple of weak starts and then no start- I replaced both the main batter and the aux battery 1 week ago.
Today I started the car and then engine didn't start, got stuck in RUN and went haywire.
The only way I could turn it off was to disconnect the battery. When I reconnect it, it does this same thing. This is insane!

Does anyone have some ideas just so I can get it to the dealership?
It feels like the the car is completely busted.
Here's a link to a video. Please help.

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[WranglerMan]

Have you metered the batteries separately to check voltages, I know you said you put new batteries in but start by checking the battery voltages

 

[andwew]

Have you metered the batteries separately to check voltages, I know you said you put new batteries in but start by checking the battery voltages

Thanks wrangler man. I just checked and the voltage was very very low 6 Volts. Got a friend to jump me and I'm up and running again.
I guess the low voltage explains the craziness. Now I have to find out why the battery died in the first place...
Thanks again

 

[WranglerMan]

@andwew glad your up and running now we need to find out why your batteries were so low.

You said you put new aux and main crank battery in ……so were they fully charged when you put them in ?

If your JL is parked a lot your best best is to get a properly sized smart charger and keep your Jeep on it, if they were fully charged and it’s a daily driver we need to look at other things like parasitic draw, all newer vehicles have battery draw 24/7 but if you have say solenoids in the background or dash cams these all add to the load and will pull the batteries down.

 

[andwew]

Thanks wrangler man. I'm going to keep a close eye on this. There are a lot of variables at the moment.
I have a winch and lights etc... The batteries being new, I'm not sure what there charge were when I put them in.
And I just realized I had placed in an OBD reader and left it in over night :-/
I just picked up a trickle charger to help with the batteries.

I'm glad the complete electrical breakdown was seemingly from the dead battery and nothing else. I'll keep you posted.

@andwew glad your up and running now we need to find out why your batteries were so low.

You said you put new aux and main crank battery in ……so were they fully charged when you put them in ?

If your JL is parked a lot your best best is to get a properly sized smart charger and keep your Jeep on it, if they were fully charged and it’s a daily driver we need to look at other things like parasitic draw, all newer vehicles have battery draw 24/7 but if you have say solenoids in the background or dash cams these all add to the load and will pull the batteries down.

.

 

[SunriseJeep]

Hello-
My 2018 JLUR has been completely falling apart lately. At first it had a couple of weak starts and then no start- I replaced both the main batter and the aux battery 1 week ago.
Today I started the car and then engine didn't start, got stuck in RUN and went haywire.
The only way I could turn it off was to disconnect the battery. When I reconnect it, it does this same thing. This is insane!

Does anyone have some ideas just so I can get it to the dealership?
It feels like the the car is completely busted.
Here's a link to a video. Please help.

I had the same thing happen. My wipers turned on then wouldn’t turn off. Then battery died. I had it replaced and no more problems. I also have a 2018 JLu but mine is a Sahara

 

[andwew]

I had the same thing happen. My wipers turned on then wouldn’t turn off. Then battery died. I had it replaced and no more problems. I also have a 2018 JLu but mine is a Sahara

Ya, dead batteries. Everything seems fine now other than service ess light... But I'm on edge still...

 

[andwew]

Hello everyone -
I just wanted to provide an update with my situation. Everything seemed to be running fine since the jump and trickle charge. However, the service ESS light would not turn off. I gave up and took it to the dealership. They said I was getting a lot of low voltage warnings and most likely one of the batteries was bad. They did a load test and found out the AUX battery I got from Autozone was bad. They replaced it despite being 5 days out of my warranty (hey cool).

So turns out I replaced my dead battery with a bad battery... I guess that happens - but shitty luck. Everything has been great since - no errors, no issues. Thanks for the help guys

 

[PacNWJLGecko]

For the future, I would recommend a CTEK charger. They are ridiculously good. They can bring back batteries from the dead that other chargers can't.

 

[GPWER]

I am sorry to hear of your difficulties but poor design and poor materials is not shitty luck. That AUX has a max life of 2 years think about replacing that every 2 years if it lasts that long many as many fail that i have seen at 1.5 years. That AUX battery also has a sticker on it that says do not exceed 14.4 volts how often have you seen 14.5 14.6 volts charging. Many people get a new main battery not realizing the AUX drained your main battery. I hope they re-think or re-engineer this system its deeply upsetting to spend the hard earned money and have this happen, wait till those people that bought the 392 for 100k and have the same issues. Good luck and I hope you don't get stranded again. YouTube has many great reviews of portable jumpers.

 

[WranglerMan]

The whole aux battery and it’s location is a terrible design, I know lots have bypassed there’s with jumpers and replaced by taking off fenders or going thru the top by removing the PDC but battery upkeep should never be this hard.

I made a chunky investment with the Genesis design and hoping that design along with the batteries I chose to use gives me many years of dependable service.

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