[Brandaloo]

Thank you for the thoughts.

I wonder if the BCM fuse (F40?) is blown or something got jostled loose in the fuse block under the hood.

Do you have a voltmeter to check the battery? If it's not somewhere around 13V you have a battery problem. If it's about 13V and drops significantly when you try to start, it's a battery problem. If it doesn't drop, it *could* be a failed module, fuse, or circuit breaker. Even if the starter isn't cranking, there's still a significant load on the electronics when you try to start.

I do live on a rough, dirt road so something getting jostled lose is a definite possibility.

I'd been trying to jump and charge and start the jeep several times before my dad came up and check the battery. By the time he came up here it was only at 11.7 when he first tested it. He said when he tried to jump it, it was at 12.6 volts.

I will check that fuse though. According to a website I found F41 is a 60 amp "Body Control Module (BCM) - Feed 2" is that the one you're suggesting?

F40 is a 20 amp fuse trailer tow park light.

 

[Rojhan]

I do live on a rough, dirt road so something getting jostled lose is a definite possibility.

I'd been trying to jump and charge and start the jeep several times before my dad came up and check the battery. By the time he came up here it was only at 11.7 when he first tested it. He said when he tried to jump it, it was at 12.6 volts.

I will check that fuse though. According to a website I found F41 is a 60 amp "Body Control Module (BCM) - Feed 2" is that the one you're suggesting?

F40 is a 20 amp fuse trailer tow park light.

F41 sounds more like it, then. I don't have a KL anymore, so was going by memory.

Those voltages make it sound like a bad battery, though.

 

[Brandaloo]

F41 sounds more like it, then. I don't have a KL anymore, so was going by memory.

Those voltages make it sound like a bad battery, though.

Do you know how I can disengage the emergency brake with a dead vehicle? It's currently engaged and when I override the gear shift thing and put it in neutral I still can't move the vehicle because the **** parking brake is on. I keep pushing the button to release it but nothing happens. The orange light on the button just turns on whenever I push it. I tried doing it with the vehicle in park and the door closed like the manual says it needs to be but that didn't help.

 

[crash486]

Do you know how I can disengage the emergency brake with a dead vehicle? It's currently engaged and when I override the gear shift thing and put it in neutral I still can't move the vehicle because the **** parking brake is on. I keep pushing the button to release it but nothing happens. The orange light on the button just turns on whenever I push it. I tried doing it with the vehicle in park and the door closed like the manual says it needs to be but that didn't help.

I don't know definitely but have you tried putting it in service mode though uconnect? Or wait a bit longer for someone who knows to reply .

Crash486 - Jeep Cherokee Limited diesel

 

[Brandaloo]

I don't know definitely but have you tried putting it in service mode though uconnect? Or wait a bit longer for someone who knows to reply .

Crash486 - Jeep Cherokee Limited diesel

Unfortunately the Uconnect screen won't even turn on.

 

[Mark_]

Do you know how I can disengage the emergency brake with a dead vehicle? It's currently engaged and when I override the gear shift thing and put it in neutral I still can't move the vehicle because the **** parking brake is on. I keep pushing the button to release it but nothing happens. The orange light on the button just turns on whenever I push it. I tried doing it with the vehicle in park and the door closed like the manual says it needs to be but that didn't help.

I'm having a little trouble understanding something here... This a 5 month old Jeep and it won't start. Jump starting it apparently didn't do anything, so... this is what I would call a major failure and the dealership should be all over this, getting your Jeep to the shop and fixing it. You first posted about this on Jan 4 and the situation hasn't changed since ??

Most electric parking brakes can be disabled manually, but your Jeep is brand new so you should not be touching anything...

So maybe I'm missing something here and apologies if that's the case. If not, the dealership is your only answer.

 

[Mark_]

Just to add to my above message, after remembering you live in a remote area. So... tell me more about how you attempted to jump start the Cherokee ? Did you use a small Li-ion booster pack, a bigger (conventional) booster pack or another vehicle ? Have you talked with a local tow truck operator, to see if they can get in there ? Like I said earlier, they are resourceful... They could also go in with a smaller truck to just try a boost...

Disabling the EPB (park brake) would require getting under the Jeep and removing some hardware, if it is removeable... If you need to go that route, talk with the service people at the dealership and ask for the correct procedure.

 

[Statcher1]

Remote area or not. It’s a new vehicle. Stop fooling with it and having it sent to the dealer. It’s not your problem it’s the service departments.


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[Mark_]

Remote area or not. It’s a new vehicle. Stop fooling with it and having it sent to the dealer. It’s not your problem it’s the service departments.


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Yep. Though this may be a bit of a special case, because of possible access restrictions to said vehicle. If a tow truck really can't get in there, then getting the Jeep out on its own power *may be* the only viable option. Do dealership techs make house calls ? Yeah maybe not..

 

[Brandaloo]

Thanks for the response.

I'm having a little trouble understanding something here... This a 5 month old Jeep and it won't start. Jump starting it apparently didn't do anything, so... this is what I would call a major failure and the dealership should be all over this, getting your Jeep to the shop and fixing it. You first posted about this on Jan 4 and the situation hasn't changed since ??

Most electric parking brakes can be disabled manually, but your Jeep is brand new so you should not be touching anything...

So maybe I'm missing something here and apologies if that's the case. If not, the dealership is your only answer.

The dealership will be all over it but I first have to get it to them. I live in a very rural area with a steep narrow driveway. I called Jeep roadside assistance and 5 tow company have declined the job due to the location. 2 of them said they would do it but only after the roads dry out. It's been raining on and off the last 5 days and it's not likely to stop for another 4-5 days.

Finally today the dealership offered to give me a loaner vehicle until I'm able to get a tow company up to my property to get my Jeep towed.

My Uncle offered to hook up to the rear of my vehicle and essentially be my brakes (he has a huge 1 ton diesel truck) as I creep down my steep road in neutral. It's only about a 1/2 mile that I need to make it down to where a tow truck would be able to reach me. My new issue is that the stupid parking brake is engaged and I can't take it off so I can't take my uncle up on his offer.

 

[nocaps]

This got me wondering why is there a second battery for ESS in some vehicles. From what I can read it is apparently to operate accessories while the engine is stopped, but why not just have a larger main battery vs. the extra expense and complexity of a second battery? And why only in some vehicles? One potential explanation I have seen is that in some vehicles there wasn't room to increase the size of the main battery so it was more practical to add a second battery in some other underutilized space, but not certain if that is correct or not. Another possibility is that larger engines (such as the V8) require more starting power, but as far as I can tell the WK2 is not the only vehicle that uses two batteries (another is the Pacifica I think) and other these vehicles do not necessarily have larger engines than the Cherokee. So why bother with two batteries in some vehicles but not others?

 

[Brandaloo]

Just to add to my above message, after remembering you live in a remote area. So... tell me more about how you attempted to jump start the Cherokee ? Did you use a small Li-ion booster pack, a bigger (conventional) booster pack or another vehicle ? Have you talked with a local tow truck operator, to see if they can get in there ? Like I said earlier, they are resourceful... They could also go in with a smaller truck to just try a boost...

Disabling the EPB (park brake) would require getting under the Jeep and removing some hardware, if it is removeable... If you need to go that route, talk with the service people at the dealership and ask for the correct procedure.

Ok, so I have done all of the above. I jumped it with my own vehicle. I jumped it with my dad's truck. I have one of those jump box things and I tried that. Three days ago I went and bought this from autozone https://www.autozone.com/test-scan-and-specialty-tools/battery-charger/duralast-50-amp-12-volt-battery-charger/412270_0_0

I had that hooked up for over 48 hours and then tried to start it with no luck. It did something though because previously the interior and headlights had stopped working. After having that charger hooked up both of those lights worked and the dash lit up with the normal "press brake and push start button" message. Unfortunately I still couldn't use the menu on the dash to disable the parking brake or do anything at all really. I pressed the select button and the arrow buttons but the message never changes.

I hooked up my cheap diagnostic code reader but it didn't work because the vehicle needs to be started for it to read any codes.

Lastly, two days ago a brave tow truck driver made it 90% of the way to my house but gave up because he was in a huge two wheel drive flatbed. He walked the last 1/4 mile to my house with his jumpbox but his didn't work either.

One last thing about the battery charger I bought. When the car battery becomes fully charged the light on the charging unit is supposed to change from "charging" to "charged/maintaining." After at least 48 hours of being hooked up to my jeep though, it never changed, it still said "charging."

 

[Mark_]

Ok, so I have done all of the above. I jumped it with my own vehicle. I jumped it with my dad's truck. I have one of those jump box things and I tried that. Three days ago I went and bought this from autozone https://www.autozone.com/test-scan-...cialty-tools/battery-charger/duralast-50-amp-12-volt-battery-charger/412270_0_0

I had that hooked up for over 48 hours and then tried to start it with no luck. It did something though because previously the interior and headlights had stopped working. After having that charger hooked up both of those lights worked and the dash lit up with the normal "press brake and push start button" message. Unfortunately I still couldn't use the menu on the dash to disable the parking brake or do anything at all really. I pressed the select button and the arrow buttons but the message never changes.

I hooked up my cheap diagnostic code reader but it didn't work because the vehicle needs to be started for it to read any codes.

Lastly, two days ago a brave tow truck driver made it 90% of the way to my house but gave up because he was in a huge two wheel drive flatbed. He walked the last 1/4 mile to my house with his jumpbox but his didn't work either.

One last thing about the battery charger I bought. When the car battery becomes fully charged the light on the charging unit is supposed to change from "charging" to "charged/maintaining." After at least 48 hours of being hooked up to my jeep though, it never changed, it still said "charging."

Wow... Ok. Thanks for the update, that clears it right up for me. Some guy named Murphy has a law for stuff like this... :|
I can't believe the bad luck...

Ok well, the battery situation is very-very weird and yes, a blinking charger light like that means the battery never reaches 100%. But just how *bad* it is, we can't say without a load test. I'd be really curious to try yours with a good battery installed, but again, jumping it like you've tried should've gotten it started, at least, if it was only a bad battery..

Well good news about the loaner, so maybe the best thing to do is wait for the road to dry up. As for the EPB, ask the service guys at your dealership, they can probably print you the procedure...

 

[Rojhan]

If the battery is damaged and shorted internally, you may not be able to jump it no matter what you do. Can you temporarily replace the battery?

Or, get a 4WD tow truck. You must be on an interesting road if 2WD can't get up.

 

[Rojhan]

This got me wondering why is there a second battery for ESS in some vehicles. From what I can read it is apparently to operate accessories while the engine is stopped, but why not just have a larger main battery vs. the extra expense and complexity of a second battery? And why only in some vehicles?

I think (not confirmed) that there is some form of battery isolator between the main and the ESS battery. If you drain the battery that runs the electronics, you can still start with the main battery which will then start charging the ESS battery. The small battery is taking the accessory load so the big battery isn't drained and can activate ESS quicker and more often.

 

[Brandaloo]

If the battery is damaged and shorted internally, you may not be able to jump it no matter what you do. Can you temporarily replace the battery?

Or, get a 4WD tow truck. You must be on an interesting road if 2WD can't get up.

Ya, the road I'm on is pretty sketchy. I'm used to it and have no issues getting up there in 2 wheel drive. There's a crazy hairpin turn though that is an issue for longer tow trucks. Another issue I'm having is that the manual seems to say that the only way to tow my vehicle is with a flat bed. I can't use a tow dollie or the type of tow truck that just lifts two of the wheels off the ground. My Jeep's default setting is auto 4-wheel drive and there's no way to take it out of that and have it in just two-wheel drive. I believe that's why the manual seems to say to use a flatbed only. I say "seems to say" because it's a little confusing.

I'd love some input on this as well actually. Am I reading this correctly for my model?

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[Mark_]

If the battery is damaged and shorted internally, you may not be able to jump it no matter what you do. Can you temporarily replace the battery?

Or, get a 4WD tow truck. You must be on an interesting road if 2WD can't get up.

I've never witnessed such a situation, but I guess it is possible. @Brandaloo : can you try jump starting it with your Cherokee battery disconnected ? Real care must be taken not to cause a short circuit here (positive touching chassis or engine, for example).

Edit to add : careful if trying with another battery, because Cherokee batteries have the posts in the *uncommon* position, meaning positive front right (installed back left in the KLs). Most car batteries have it the other way, positive front left.

 

[nocaps]

I think (not confirmed) that there is some form of battery isolator between the main and the ESS battery. If you drain the battery that runs the electronics, you can still start with the main battery which will then start charging the ESS battery. The small battery is taking the accessory load so the big battery isn't drained and can activate ESS quicker and more often.

Yes, that is the case, but just wondering why a second battery is necessary on some vehicles with ESS while others simply use a single, larger battery.

 

[ArizonaFred]

I’m kinda leaning towards the shorted battery since the charger never was able to charge it.

I would try putting any battery in just to get it down the hill. Watch your connections as mentioned. Then once down the hill put the bad battery in and get a repair from the dealer.

I don’t think I’d go the no battery hooked up route. Too many electronics....


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[Brandaloo]

I've never witnessed such a situation, but I guess it is possible. @Brandaloo : can you try jump starting it with your Cherokee battery disconnected ? Real care must be taken not to cause a short circuit here (positive touching chassis or engine, for example).

Edit to add : careful if trying with another battery, because Cherokee batteries have the posts in the *uncommon* position, meaning positive front right (installed back left in the KLs). Most car batteries have it the other way, positive front left.

Thanks for the advice and warning. I got lent a 2017 Grand Cherokee today and my thought was that I'd be able to swap that battery out and connect it to my Cherokee. Then I remembered that the battery might be under the passenger seat. Not sure I trust myself to tackle that. I'm not very savvy with that kind of stuff (if that wasn't obvious already)!