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Old 01-31-2012, 12:11 PM   #1
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'12 JKU intake

I have a JKU 12 and it is back in the shop again due to a check engine light. The light seems to go on after it's been running for a while. I took it in last week and they said it needed a computer update for a reading saying that the 2nd cylinder was mis-firing. So they updated it and then Sunday (after a 1.5 hour drive) it came back on. Today they are taking apart the intake.
My question is... Could this be a potential side effect of me taking it off-roading a few months ago? (I think it was September) I took it thru tons of mud/water/sugar sand... Etc. I have not had problems with it until now. I'm worried that if the trip did it screwed it up, then it's not covered under warranty. I have the 6 yr extended warranty on it.
Thanks!

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Old 01-31-2012, 12:23 PM   #2
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Maybe, but dont tell the dealer about this, they may try and void warranty.

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Old 01-31-2012, 12:53 PM   #3
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Originally Posted by jgaley69
Maybe, but dont tell the dealer about this, they may try and void warranty.
I wasn't planning on telling them but the imbedded pine needles and mud stains under the hood might give them a hint....
I washed the under carriage like crazy when I got home and washed under the hood, but it probably wasn't enough. I waded thru some pretty deep water. Didn't get stuck like others did.
But isn't that what a Jeep is for? If I can't take it mudding... What the heck?? It's not a show toy! Gotta get it muddy!
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Old 01-31-2012, 01:01 PM   #4
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Nothing you did will "void" your warranty. Specific components covered under your warranty may not be covered as the result of your doing however. Wait and see what the dealership says and offers to fix the situation. It's possible that they may deny coverage based on something being damaged during your wheeling trip but they do see Jeeps every single day in the same situation. They will have to prove to you that what you did specifically caused the check engine light. However, they can also simply deny to repair anything based on their claim and you'll have to try your luck at another location. Not to add to this and make it worse but it's entirely possible that if they do deny coverage and you attempt to take it to another dealership for warranty work, they will flag your vehicle and it could show up on the other dealership's computer. It's hard to tell really because going through water and mud can do all kinds of things to a jeeps transmission and other components. I think the longer you have you're jeep you'll either fall into one of two categories regarding this:

A. Don't care about it
B. Prefer to wheel primarily on dirt/dry roads, mtn passes, low level streams etc.

Good luck with the repair and solution, let us know what happens.
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Old 01-31-2012, 01:02 PM   #5
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You're not the only one who has experienced this. Jeep has issued a TSB on it, that's probably why the dealer tried re-flashing your computer. Another WF member, sandbaja, had the same experience you are having: http://www.wranglerforum.com/f33/new...ml#post1967792

I doubt anything you did had any bearing on the problem.... Thank goodness for warranties!
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Old 01-31-2012, 01:06 PM   #6
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Originally Posted by Up Hill Bill View Post
You're not the only one who has experienced this. Jeep has issued a TSB on it, that's probably why the dealer tried re-flashing your computer. Another WF member, sandbaja, had the same experience you are having: http://www.wranglerforum.com/f33/new...ml#post1967792

I doubt anything you did had any bearing on the problem.... Thank goodness for warranties!
^ This
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Old 01-31-2012, 01:17 PM   #7
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Quote:
Originally Posted by Jk11-girl View Post
I have a JKU 12 and it is back in the shop again due to a check engine light. The light seems to go on after it's been running for a while. I took it in last week and they said it needed a computer update for a reading saying that the 2nd cylinder was mis-firing. So they updated it and then Sunday (after a 1.5 hour drive) it came back on. Today they are taking apart the intake.
My question is... Could this be a potential side effect of me taking it off-roading a few months ago? (I think it was September) I took it thru tons of mud/water/sugar sand... Etc. I have not had problems with it until now. I'm worried that if the trip did it screwed it up, then it's not covered under warranty. I have the 6 yr extended warranty on it.
Thanks!
trust me, if my warranty has not been voided. yours will not be..

Just make sure to clean it good before taking it back.
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Old 01-31-2012, 01:29 PM   #8
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Originally Posted by Jk11-girl View Post
I have a JKU 12 and it is back in the shop again due to a check engine light. The light seems to go on after it's been running for a while. I took it in last week and they said it needed a computer update for a reading saying that the 2nd cylinder was mis-firing. So they updated it and then Sunday (after a 1.5 hour drive) it came back on. Today they are taking apart the intake.
My question is... Could this be a potential side effect of me taking it off-roading a few months ago? (I think it was September) I took it thru tons of mud/water/sugar sand... Etc. I have not had problems with it until now. I'm worried that if the trip did it screwed it up, then it's not covered under warranty. I have the 6 yr extended warranty on it.
Thanks!
It's almost impossible that that was related if the offroading occurred several months ago. Even if you were offroading, unless extreme abuse, the engine should be durable enough to withstand that.Someone in Colorado is also going through this now also so that makes 3 2012 wranglers that I can find with the P0302 code. Mine is still in the shop and likely will be at least until the end of the week. My dealer gave me a rental vehicle for 5 days. By the end of the week we should start to see the fog clear away with the P0302 code. It's probably one of 3 things..1. bad exhaust valve 2. bad intake valve or 3 worst case a bad #2 cylinder/rings. The leak down test performed on mine showed a 45% loss on cylinder 2. It should be well under 10% and the comparable to the other cylinders.

So you are in the repair channel and might as well wait for the diagnosis/repair like me. No point in getting worried or upset though I really miss my Jeep (-:

My guess is some out of spec part got into the manufacturing cycle or the software created an issue. The TSB is pretty broad across alot of different scenarios and subassemblies.
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Old 01-31-2012, 01:29 PM   #9
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Are you running an aftermarket intake? Just asking because of the thread title.
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Old 01-31-2012, 01:56 PM   #10
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Quote:
Originally Posted by daggo66
Are you running an aftermarket intake? Just asking because of the thread title.
Nope... Everything is stock...
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Old 01-31-2012, 02:01 PM   #11
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Thanks to everyone for their input... They gave me a loaner until it is fixed and he said that EVERYTHING would be covered and I won't have a bill. But if course he said that before they take it apart. I'm thinking that it isn't due to my off-roading. Although I did go thru some water that was just about up to my hood. You never know. It's pretty bad when the service center guys know you when you walk in the door (and it's a large dealership)!
I laughed today when I saw 3 wranglers in the shop and I asked the service guy... What is this.. Wrangler day?? Haha!
I'll keep everyone posted... It's probably just something small. Besides... Don't most jeepers ignore the check engine light these days? LOL!
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Old 01-31-2012, 02:03 PM   #12
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Originally Posted by sandbaja View Post
....
My guess is some out of spec part got into the manufacturing cycle or the software created an issue. The TSB is pretty broad across alot of different scenarios and subassemblies.
My JKU Rubicon was built the day after yours. If it's a parts batch problem, I guess I'll be finding out soon.....
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Old 01-31-2012, 02:03 PM   #13
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Quote:
Originally Posted by Up Hill Bill
You're not the only one who has experienced this. Jeep has issued a TSB on it, that's probably why the dealer tried re-flashing your computer. Another WF member, sandbaja, had the same experience you are having: http://www.wranglerforum.com/f33/new...ml#post1967792

I doubt anything you did had any bearing on the problem.... Thank goodness for warranties!
Thanks!! I'll take a look at the post!
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Old 01-31-2012, 02:03 PM   #14
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Originally Posted by ESP
Nothing you did will "void" your warranty. Specific components covered under your warranty may not be covered as the result of your doing however. Wait and see what the dealership says and offers to fix the situation. It's possible that they may deny coverage based on something being damaged during your wheeling trip but they do see Jeeps every single day in the same situation. They will have to prove to you that what you did specifically caused the check engine light. However, they can also simply deny to repair anything based on their claim and you'll have to try your luck at another location. Not to add to this and make it worse but it's entirely possible that if they do deny coverage and you attempt to take it to another dealership for warranty work, they will flag your vehicle and it could show up on the other dealership's computer. It's hard to tell really because going through water and mud can do all kinds of things to a jeeps transmission and other components. I think the longer you have you're jeep you'll either fall into one of two categories regarding this:

A. Don't care about it
B. Prefer to wheel primarily on dirt/dry roads, mtn passes, low level streams etc.

Good luck with the repair and solution, let us know what happens.
I think I'll choose both A & B! Lol
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Old 01-31-2012, 02:05 PM   #15
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Originally Posted by Full-Traction Suspension
trust me, if my warranty has not been voided. yours will not be..

Just make sure to clean it good before taking it back.
They still have it... I think that my tire cover doesn't help me either. It says:
"I make dirt look good"!
Thank goodness my vanity plate isn't in yet... then I'll be in trouble!
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Old 01-31-2012, 02:07 PM   #16
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Originally Posted by sandbaja

It's almost impossible that that was related if the offroading occurred several months ago. Even if you were offroading, unless extreme abuse, the engine should be durable enough to withstand that.Someone in Colorado is also going through this now also so that makes 3 2012 wranglers that I can find with the P0302 code. Mine is still in the shop and likely will be at least until the end of the week. My dealer gave me a rental vehicle for 5 days. By the end of the week we should start to see the fog clear away with the P0302 code. It's probably one of 3 things..1. bad exhaust valve 2. bad intake valve or 3 worst case a bad #2 cylinder/rings. The leak down test performed on mine showed a 45% loss on cylinder 2. It should be well under 10% and the comparable to the other cylinders.

So you are in the repair channel and might as well wait for the diagnosis/repair like me. No point in getting worried or upset though I really miss my Jeep (-:

My guess is some out of spec part got into the manufacturing cycle or the software created an issue. The TSB is pretty broad across alot of different scenarios and subassemblies.
I miss mine too... They sent me home is a Dodge Caliber. Not bad of a car... But it's not my Jeep!!
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Old 02-01-2012, 01:50 PM   #17
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Got a call from the dealership.... They need a "special" tool to reach something in the Jeep... I have NO clue for where.. I'm not sure i wanna know. Anyway, the tool won't be in till tomorrow. They said they'll call tomorrow night or friday morning to let me know what they find.
It's times like these when I wish I knew more about fixing cars and had the tools to do it myself! Ugh! I miss my Jeep!
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Old 02-01-2012, 02:05 PM   #18
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Got a call from the dealership.... They need a "special" tool to reach something in the Jeep... I have NO clue for where.. I'm not sure i wanna know. Anyway, the tool won't be in till tomorrow. They said they'll call tomorrow night or friday morning to let me know what they find.
It's times like these when I wish I knew more about fixing cars and had the tools to do it myself! Ugh! I miss my Jeep!
Read research and wrench as much as possible with your Jeep and others. This is how you will know more than most dealerships and make better decisions regarding the care and up keep of your Jeep.
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Old 02-03-2012, 11:35 AM   #19
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Bad news! I have a cracked head. Worse news... Part is on back order and won't be in until next thurs at the earliest then they still have to replace it!
Good news... It's not my fault and it's covered under warranty and I still have a loaner till its fixed!
Other bad news.... It's BEAUTIFUL weather and I don't have my jeep to take the top off! Ugh!!
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Old 02-03-2012, 11:56 AM   #20
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Bad news! I have a cracked head. Worse news... Part is on back order and won't be in until next thurs at the earliest then they still have to replace it!
Good news... It's not my fault and it's covered under warranty and I still have a loaner till its fixed!
Other bad news.... It's BEAUTIFUL weather and I don't have my jeep to take the top off! Ugh!!
I feel for you JK11-girl. It sounds like it is time for the dealers to raise or set a stocking level for the pentastar cylinder heads.
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Old 02-03-2012, 12:02 PM   #21
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Originally Posted by sandbaja

I feel for you JK11-girl. It sounds like it is time for the dealers to raise or set a stocking level for the pentastar cylinder heads.
It's Misty.... And yea they should... Thanks
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Old 02-05-2012, 01:31 PM   #22
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JK11-girl, do you know the build date of your Jeep?
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Old 02-05-2012, 02:35 PM   #23
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JK11-girl, do you know the build date of your Jeep?
No... Not off the top of my head... I haven't seen my jeep since Tuesday . I'll let you know when I get it back. Why do you ask?
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Old 02-05-2012, 02:54 PM   #24
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... It's pretty bad when the service center guys know you when you walk in the door (and it's a large dealership)!
....
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Can't imagine why the service guys recognize you when you come in......


Just sayin'....
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Old 02-05-2012, 03:30 PM   #25
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Can't imagine why the service guys recognize you when you come in......

Just sayin'....
Because I've been in there a few times. The first day I rolled off the lot, the traction control light came on, then brought it back two days later AGAIN for the same thing, then an oil change last month (first one is free), then 2 Fridays ago for the same problem I have now... Then again this past Tuesday because Fridays "problem" came back... That and they say the know me because my name is different .
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Old 02-05-2012, 03:35 PM   #26
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There are some threads about faulty heads. Sounds like the same thing your experiencing
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Old 02-05-2012, 03:43 PM   #27
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No... Not off the top of my head... I haven't seen my jeep since Tuesday . I'll let you know when I get it back. Why do you ask?
~Misty~
I am trying to determine who is in the risk group for cylinder head replacement. If we have a date range we can determine a very rough percentage of those at risk. Right now I can only conclusively state those bulit on 7/19 of 2011 are at risk with a defect rate of 1 out of a 1000 (guessing...I need to look up daily production rates)
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Old 02-05-2012, 03:51 PM   #28
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I am trying to determine who is in the risk group for cylinder head replacement. If we have a date range we can determine a very rough percentage of those at risk. Right now I can only conclusively state those bulit on 7/19 of 2011 are at risk with a defect rate of 1 out of a 1000 (guessing...I need to look up daily production rates)

Remember, the Pentastars are assembled at the Trenton, Michigan engine assembly plant, then shipped to the Toledo, Ohio Wangler assembly plant.

If Chrysler's logistics are any good, there should be a pretty direct correlation between engine batches and Wrangler batches. But, not necessarily a direct correlation.... Only Jeep will be able to put that together with any certainty.
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Old 02-06-2012, 12:33 PM   #29
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Originally Posted by sandbaja
I am trying to determine who is in the risk group for cylinder head replacement. If we have a date range we can determine a very rough percentage of those at risk. Right now I can only conclusively state those bulit on 7/19 of 2011 are at risk with a defect rate of 1 out of a 1000 (guessing...I need to look up daily production rates)
Good idea.. I'll let you know when I get mine back. Where would I find that info?
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Old 02-06-2012, 12:34 PM   #30
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There are some threads about faulty heads. Sounds like the same thing your experiencing
Thanks... I'll take a look at them!

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