Sway Bar / FUSE 79 SMART BAR CTRL MOD

RonsAV

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Hickory NC
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2021 Wrangler Rubicon 392
Sway Bar Keeps blowing fuses. I have reset and firmly seated every fuse and relay into place also. ( found alot ) however, This fuse #79 continues to blow about once a week. Dealer has no clue. Anyone else having this issue?
 

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Sway Bar Keeps blowing fuses. I have reset and firmly seated every fuse and relay into place also. ( found alot ) however, This fuse #79 continues to blow about once a week. Dealer has no clue. Anyone else having this issue?
Does this happen when you disconnect/connect the swaybar? Has there been any additional lights or other accessories installed on your 392? Try to see exactly when it happens so we can think of some causes.
 
No additions or mods other than marker lights. Still stock everything.

This happened first time at 3500 miles or so. Dealer said they replaced fuse. Happened several times later. They replaced fuse again. No error codes thrown.

Seems to happen when I am idling for a few minutes after vehicle is warmed up. Like waiting in line at bank or drive through.

I also have gotten Service 4wh Drive message when sitting idling for a few minutes. Tires scrub like its locked in 4wheel. Turn off engine and back to normal.
 
Ill update when I go back to Dealer.
 
See this thread.
Resolution was shorted wire harness melted against manifold.
Got mine fixed two days ago and had a service bulletin on Serv 4wd condition also.
 
Serv 4wd message is back. Waiting in line at the bank. Dealer says park it.
 

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How’s the transfer case motor related to the fuses blowing, do you think/did they say?
Did you happen to get or can you get a snapshot of that service bulletin?
Do you drive in Off-road+ ?
Do you use the tiptronic shifter?
How many miles? What kind of driving?
Thanks for updates to your thread and sorry to hear about the Jeep.
 
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Dealer ordered a transfer case motor. On backorder.
Makes me want to puke. No telling how long stuff will be backordered. I've ordered so much stuff for the Jeep that I have forgotten what all it is.......backordered......
I'd almost put my money on most of this kind of stuff being overheating electrical stuff. Can't see why computer would be sending current to transfer case while sitting in line at bank. Seems like that might happen when it detect rear wheel slip and tried to send power to front wheels.

Of course, it going back to normal after shutting off, argues against a shorted out wire.

On another note, my JK did have a faulty transfer case position sensor that wreaked all kinds of havoc until I figured out what it was. It was a simple fix, but that thing lit up all kinds of lights and errors.

Seems like they didn't have time to sort out all the wiring since the 392 was a bit of a rush job. I may get under the hood and start looking at wiring harnesses before it gets too hot down here. Heat shield/wrap is cheap.....

Back in the day, folks would wrap the headers /exhaust manifolds as they are the main source of underhood heat.

I guess it's not hot in NC this time of year either......

My thoughts are with you and wish you the best of luck. This kind of crap is super frustrating when you are at the mercy of the dealer and a part is backordered..... Shame on Jeep if they don't get you back on the road soon.
 
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Thanks for the support, I did get them to let me take my 392 home though. Seems to run fine unless I’m in line somewhere. So just limiting my drives for now. Yea pretty much sucks.
 
How’s the transfer case motor related to the fuses blowing, do you think/did they say?
Did you happen to get or can you get a snapshot of that service bulletin?
Do you drive in Off-road+ ?
Do you use the tiptronic shifter?
How many miles? What kind of driving?
Thanks for updates to your thread and sorry to hear about the Jeep.
Fuse blowing was sway bar link issue. So thats solved. The Serv 4wd light is something different they say. I pulled the code w ODBC reader. They verified it is same one they see too.

This is my daily driver, no offroad, rarely use tiptronic shifting, 10,200 mi.

Serv 4wd only shows up when idling sitting in line somewhere.
 

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How’s the transfer case motor related to the fuses blowing, do you think/did they say?
Did you happen to get or can you get a snapshot of that service bulletin?
Do you drive in Off-road+ ?
Do you use the tiptronic shifter?
How many miles? What kind of driving?
Thanks for updates to your thread and sorry to hear about the Jeep.
There were two separate issues here originally the dealer thought they were related but it turns out that they are different.
 
Fuse blowing was sway bar link issue. So thats solved. The Serv 4wd light is something different they say. I pulled the code w ODBC reader. They verified it is same one they see too.

This is my daily driver, no offroad, rarely use tiptronic shifting, 10,200 mi.

Serv 4wd only shows up when idling sitting in line somewhere.
Thank you for the reply.
Can you please post the service bulletin if you can get it?
I have searched but can’t find one like referenced above, but it’s probably user error on my part.
 
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This did not solve my Serv 4wd issue. Light came back on as i mentioned and dealer is now ordering a transfer case motor.

Again this Serv 4wd problem started in conjuction with Sway Bar Link blowing fuses. They found that wiring issue and fixed it, but have been unable to fix the Serv 4wd issue.
 
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This did not solve my Serv 4wd issue. Light came back on as i mentioned and dealer is now ordering a transfer case motor.

Again this Serv 4wd problem started in conjuction with Sway Bar Link blowing fuses. They found that wiring issue and fixed it, but have been unable to fix the Serv 4wd issue.
Alright....your problem got me thinking. If it only does it while you are sitting idling......does it do it in park, drive or both? Does it do it consistently or intermittently? Can you reliably make it do it? Does it happen at an exact time related to a shift event (exactly 10 minutes)? Does it happen sooner when it is hotter outside?

Could be related to computer doing some test cycle like the loose gas cap thing doesn't trigger check engine until computer does some kind of purge cycle..... If this is the case it should occur at some specific time.

If not time related, I'd look at temperature. Maybe sensor getting too hot or something like that. Can't imagine it being melted wire as once that goes bad, it would be bad all the time. These things get hot under the hood. Hood is very well insulated and doesn't get very hot. That heat has to escape elsewhere (like by the front fenders causing discoloration on some vehicles). I've noticed the heat there on mine but no color change yet....not hot where I live yet....

If it is heat related it should happen whether you are in park or drive. Clue that it is heat related might be that it happens earlier when it it hotter outside. Might look at temperatures on offroad pages and see if there is any correlation there to onset of symptom. If heat seems related, and symptom is predictable I would park it while running in park or drive (with parking brake on) and open the hood and see if that affects time to onset. Consider using a leaf blower to blow air in different areas while running the test. It might help you pinpoint the problem area.....The passenger side has a bunch of wires and stuff that looks like it could get hot. Most of the stuff I could see was well wrapped in heat insulation on mine, but given the excellent attention to detail by Jeep assemblers, some wire wrapping could've been missed on some vehicles.

If you hit pay dirt with the leaf blower, then getting an hp tuner and turning fan on at lower engine temperature might be helpful.

Or, just keep doing what you are doing and wait on dealer. Sounds like shutting it off and turning it back on stops it... Does it happen again (maybe quicker than the first time) after turning it off and back on?
 
Alright....your problem got me thinking. If it only does it while you are sitting idling......does it do it in park, drive or both? Does it do it consistently or intermittently? Can you reliably make it do it? Does it happen at an exact time related to a shift event (exactly 10 minutes)? Does it happen sooner when it is hotter outside?

Could be related to computer doing some test cycle like the loose gas cap thing doesn't trigger check engine until computer does some kind of purge cycle..... If this is the case it should occur at some specific time.

If not time related, I'd look at temperature. Maybe sensor getting too hot or something like that. Can't imagine it being melted wire as once that goes bad, it would be bad all the time. These things get hot under the hood. Hood is very well insulated and doesn't get very hot. That heat has to escape elsewhere (like by the front fenders causing discoloration on some vehicles). I've noticed the heat there on mine but no color change yet....not hot where I live yet....

If it is heat related it should happen whether you are in park or drive. Clue that it is heat related might be that it happens earlier when it it hotter outside. Might look at temperatures on offroad pages and see if there is any correlation there to onset of symptom. If heat seems related, and symptom is predictable I would park it while running in park or drive (with parking brake on) and open the hood and see if that affects time to onset. Consider using a leaf blower to blow air in different areas while running the test. It might help you pinpoint the problem area.....The passenger side has a bunch of wires and stuff that looks like it could get hot. Most of the stuff I could see was well wrapped in heat insulation on mine, but given the excellent attention to detail by Jeep assemblers, some wire wrapping could've been missed on some vehicles.

If you hit pay dirt with the leaf blower, then getting an hp tuner and turning fan on at lower engine temperature might be helpful.

Or, just keep doing what you are doing and wait on dealer. Sounds like shutting it off and turning it back on stops it... Does it happen again (maybe quicker than the first time) after turning it off and back on?
Thanks for the suggested troubleshooting tips. Since i have better things to do, like make money, i havent spent alot of time trying to find this on my own.

It does show up while only sitting in park or drive. Seems more heat related. Yes it does go off when i restart but the code is stored.

Operationally its more of an annoyance, but definitely want it resolved by the dealer and fully documented. I have also requested a case be created on this issue with Stelantis. Honestly, Stelantis views the SRTs as a “red headed stepchild” cause I get virtually no feedback from that side of the table.

Again, I do really appreciate your ideas. On a lighter note, When i get done straightening each blade of grass in my lawn, I’ll tackle this.
 
Thanks for the suggested troubleshooting tips. Since i have better things to do, like make money, i havent spent alot of time trying to find this on my own.

It does show up while only sitting in park or drive. Seems more heat related. Yes it does go off when i restart but the code is stored.

Operationally its more of an annoyance, but definitely want it resolved by the dealer and fully documented. I have also requested a case be created on this issue with Stelantis. Honestly, Stelantis views the SRTs as a “red headed stepchild” cause I get virtually no feedback from that side of the table.

Again, I do really appreciate your ideas. On a lighter note, When i get done straightening each blade of grass in my lawn, I’ll tackle this.
I hear you man...if shutting it down makes it go away.....that's probably the easiest way to handle it for the time being.

I've just had issues with vehicles before where dealers were of little value with the throwing parts at it approach because they didn't REALLY care since it was not their vehicle and with there being little experience with problems on these vehicles, sometimes have to take matters into our own hands.

Having said that, I replaced a perfectly good transmission in a 1990 F150 because of some weird noise after getting some other "geniuses" (myself included). Our conclusion is that the noise was coming from the transmission based on how it behaved. We did all kinds of stuff. Rode in back of truck going down road while noise was going on. Provoked the noise, etc....
At the end of the day after replacing transmission it still made that darn noise and we never figured it out. Ended up selling vehicle and it is still on road and still making that noise years later, so yes......sometimes you are better off straightening the grass in the yard :ROFLMAO:

Will be interested to see what final outcome of this is........

I'm going to get some artec vented inner fenders in an attempt to reduce underhood heat to try to prevent heat related issues in our hot MS summers....
 
Yea thats a great idea on inner fenders for additional cooling, post pics when you get’em on!
 
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