3.6L w/ E-Torque Battery drain

[TexasJL21]

My jeep sits around most of the year and is driven on occasion, mainly a trail rig. I have a 2021 JLU with the 3.6L E-Torque motor and automatic. There is a warn VR 10s winch and sPod BantamX on an optima yellow top battery. Those are the only 2 additional items installed on the battery. Initially, the battery was draining enough to not crank in 3-4 weeks. The draining issue has continued to get worse to the point I can start the Jeep one day and the next morning the Jeep will not crank. I have replaced the battery with new each time I have had a no crank situation to avoid capacity loss on the Optima due to over draining.

Has anyone else had issues with the 3.6L draining after sitting for extended periods of time? With it now taking barely 24 hours to drain instead of weeks, I am at a loss where to keep troubleshooting as nothing on the Jeep should be drawing that much power in that short of time to kill it. Any help or troubleshooting advise is appreciated.

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[Xcoaste]

I would remove accessories from the battery, fully charge it and see if that resolves the issue. If that doesn't make a difference, I would take it to the dealer and let them troubleshoot it. Should be under warranty still.

It is possible the 48v battery isn't being charged since you aren't running it enough either. I thought the 12v battery started the vehicle on initial startup, but I could be wrong.

 

[TexasJL21]

The drain was not initially there once the accessories were installed. This has just gotten worse over time with the same accessories. Looking for more advice on troubleshooting the 48v system and/or BSG without a dealership trip.

 

[Tncdrew]

I would remove accessories from the battery, fully charge it and see if that resolves the issue. If that doesn't make a difference, I would take it to the dealer and let them troubleshoot it. Should be under warranty still.

This

 

[Reinen]

If your Jeep is sitting that long between uses you should absolutely keep a trickle charger on it. The JL's always-on electronics produce a small parasitic draw which is not good for the battery if it sits idle for extended periods of time.

Based on your symptoms it is difficult to tell if you do have an unusually large parasitic draw or if you're just looking at a battery damaged over time by the normal parasitic draw.

Either way, you should have a trickle charger on it if the Jeep is idle for more than 3-4 days.

 

[TexasJL21]

After the latest new battery I put a Noco trickle charger on it. Just was looking if anyone else has had these issues. As this primarily is a trail rig, I won't be able to plug it in on extended trips.

 

[Vinman]

I second the idea of disconnecting the accessories you added and see if the problem persists. I know you said the add-ons weren’t an issue initially but is it possible one of them developed a voltage drain since then? Disconnecting them and seeing ifnthe problem persists is cheap and easy, all part of the diagnosing procedure.

 

[mwilk012]

Get an amp meter and attach to the negative battery cable, then chase it down.

 

[fher03]

My jeep sits around most of the year and is driven on occasion, mainly a trail rig. I have a 2021 JLU with the 3.6L E-Torque motor and automatic. There is a warn VR 10s winch and sPod BantamX on an optima yellow top battery. Those are the only 2 additional items installed on the battery. Initially, the battery was draining enough to not crank in 3-4 weeks. The draining issue has continued to get worse to the point I can start the Jeep one day and the next morning the Jeep will not crank. I have replaced the battery with new each time I have had a no crank situation to avoid capacity loss on the Optima due to over draining.

Has anyone else had issues with the 3.6L draining after sitting for extended periods of time? With it now taking barely 24 hours to drain instead of weeks, I am at a loss where to keep troubleshooting as nothing on the Jeep should be drawing that much power in that short of time to kill it. Any help or troubleshooting advise is appreciated.

I am experiencing the exact same thing, I also have a 21 JLU, I’ve added a warn winch, an ARB on board compressor and some rock slide engineer steps, everything was working good until I stopped driving it, it started with the battery lasting 30 days, 20, 7 and now it’s completely dead and wont start. I tried charging the battery and it looks like its doing a power cycle of all electronics and eventually everything shuts off, I will be taking the battery to Oreilly to get it tested and go from there, I heard it could be the Aux battery but will have to wait for the results on the main battery before I go there.

 

[mwilk012]

I am experiencing the exact same thing, I also have a 21 JLU, I’ve added a warn winch, an ARB on board compressor and some rock slide engineer steps, everything was working good until I stopped driving it, it started with the battery lasting 30 days, 20, 7 and now it’s completely dead and wont start. I tried charging the battery and it looks like its doing a power cycle of all electronics and eventually everything shuts off, I will be taking the battery to Oreilly to get it tested and go from there, I heard it could be the Aux battery but will have to wait for the results on the main battery before I go there.

Do you have Etorque or not? The words “aux battery” should never appear in a thread about Etorque.

 

[chadk77]

My jeep sits around most of the year and is driven on occasion, mainly a trail rig. I have a 2021 JLU with the 3.6L E-Torque motor and automatic. There is a warn VR 10s winch and sPod BantamX on an optima yellow top battery. Those are the only 2 additional items installed on the battery. Initially, the battery was draining enough to not crank in 3-4 weeks. The draining issue has continued to get worse to the point I can start the Jeep one day and the next morning the Jeep will not crank. I have replaced the battery with new each time I have had a no crank situation to avoid capacity loss on the Optima due to over draining.

Has anyone else had issues with the 3.6L draining after sitting for extended periods of time? With it now taking barely 24 hours to drain instead of weeks, I am at a loss where to keep troubleshooting as nothing on the Jeep should be drawing that much power in that short of time to kill it. Any help or troubleshooting advise is appreciated.

Do you have a Tazer? Firmware 11.3.7 had issues where it would drain your battery overnight. Happened to me, updated firmware, issue ceased to exist.

 

[oldcjguy]

The drain was not initially there once the accessories were installed. This has just gotten worse over time with the same accessories. Looking for more advice on troubleshooting the 48v system and/or BSG without a dealership trip.

The 48v system has nothing to do with starting the jeep. It only starts the motor for auto startstop. There is a drain on the 12v system somewhere. Just because id "didn't used to do this" doesn't mean something is wrong now and causing it to drain. Try completely disconnecting the new accessories from power and see if anything changes. Once cells become damages from excessive drain, they do not hold the charge as well anymore and it will continue to deteriorate. That "could" be why it didn't used to drain so quickly.

 

[fher03]

Do you have Etorque or not? The words “aux battery” should never appear in a thread about Etorque.

Yes. 3.6 Etorque Engine. I was under the impression we all had the AUX battery, good to know we don't.

 

[fher03]

Do you have a Tazer? Firmware 11.3.7 had issues where it would drain your battery overnight. Happened to me, updated firmware, issue ceased to exist.

Not a taser, I do have the superchips flashcal.

 

[mwilk012]

Not a taser, I do have the superchips flashcal.

It sounds like you just have a bad battery.

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