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Old 09-29-2012, 11:30 PM   #91
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Originally Posted by djc20 View Post
I have a 2012 Wrangler Sahara with the same problem. Code indicated that #2 cylinder was misfiring. They reset the computer and light came on after 15 minutes. Dealer said either a computer "glitch" or something wrong with the engine. They want the vehicle for 2 days to run tests. So far have driven about 5K miles with light on. Dealer said just continue to drive the vehicle until the light begins to flash.
That's the way to do it .... keep pedalin.

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Old 11-15-2012, 09:15 PM   #92
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Cylinder 6 Misfire

Greetings, all! I have the same issue. I am getting my Jeep back tomorrow. I live in Jacksonville, FL and had to wait several days as they had 10 Jeeps in at the dealership with the same issue. They are replacing the cylinder. Do you think this will solve the problem? If not, what type of legal recourse do we have as a group? I had 14,000 miles on mine when the light came on.

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Old 11-15-2012, 10:00 PM   #93
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Greetings, all! I have the same issue. I am getting my Jeep back tomorrow. I live in Jacksonville, FL and had to wait several days as they had 10 Jeeps in at the dealership with the same issue. They are replacing the cylinder. Do you think this will solve the problem? If not, what type of legal recourse do we have as a group? I had 14,000 miles on mine when the light came on.
I'm sure you mean replacing the cylinder head. You can't replace a cylinder. Once the head is replaced, you'll be fine.
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Old 03-14-2013, 05:06 PM   #94
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Here's another one --
My JK 2012 Wrangler Sahara -- Cylinder misfire detected - Cylinder # 2
This is my 2nd Jeep, with issues -- going into the shop Tuesday.

Extremely disappointed!!
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Old 03-16-2013, 05:36 PM   #95
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Add me to the list! Bought our 2012 JKU Sahara used with 14k on it. Day after we got it home the check engine light came on. 2 weeks later it is fixed and working well so far.
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Old 04-08-2013, 07:03 PM   #96
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Same issue here. 2012 JK Rubicon w 8600 miles.
#6 cylinder misfiring.. Took into dealer when I heard ticking, they said it was normal.. One month later, check engine light was on and no ECO as expected.
Scanned code to show the cylinder issue.

Took to dealer today, tried swapping coils, same problem, so tomorrow it's getting a new head.
I will be glad this issue is fixed.. Power loss and MPG lose were dead give aways for me BEFORE the light ever came on.
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Old 04-08-2013, 08:54 PM   #97
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How bad of a mileage loss are you guys seeing before the check engine light comes on?
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Old 05-20-2013, 12:36 PM   #98
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2012 Jeep wrangler unlimited (+/-26,000 miles)

WTF, yes Same issue here: Took the Jeep into Dealership service center for "check engine light" issue and had memory flashed. Not long after picking the Jeep up from the Jeep service department "check Engine light" comes back on. Again the vehicle logged a misfire with Cylinder #4.

So, Back to the Dealer/service center, Jeep needs new head according to the experts. Drop Jeep off on Monday morning for engine work and pick up on Friday of the same week.

All seems back to normal, until I began a 2 mile hill climb to my house (normal driving conditions, nothing crazy). Just as I'm approaching the top of the hill all hell breaks loose; Coolant begins spraying out hitting the windshield and steam is flowing out from underneath the hood. Pulled into the driveway and opened up the hood to find a radiator hose blown off the radiator, smaller hose to air-intake (air filter box) disconnected, additional hoses not clipped back into place and radiator is seemingly empty.

One would think that I'm eligible for a new engine?

any advice would be great.

Thanks
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Old 05-20-2013, 04:44 PM   #99
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I would highly doubt a new engine from what u described. The dealer should tow it back. Fix all the loose hoses and anything else that wasn't put back together correctly. Fill fluids. And detail the engine bay and wash the jeep. U might haggle for gas or a complete detail.
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Old 05-26-2013, 04:23 PM   #100
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Smile 2012 wrangler sahara cyclinder misfire

been following the thread I have a 2012 Wrangler had the CEL come on. So i got my code reader, it was cyc 6 misfire. Took it to dealer the validated it was the cyclinder that was bad and the dealer fixed it no problem. Been a week and no issues.
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Old 06-19-2013, 02:48 PM   #101
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Totally! I have a 2012 Jeep Wrangler 2 door and at 14,000 miles the check engine light came on and bam they had to replace the cylinder head. But they never said anything about flushing the computer software in it. Everything seemed back to normal up until this past week and a half when loss of power occurs occasionally when it seems to be in a higher gear but I don't know if that is the problem or not. I just hope It doesn't have anymore problems.
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Old 06-19-2013, 03:36 PM   #102
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Cyliner #6

I have 18,500 on my 2012 Jeep Wranger and the engine light came on when I was driving to work on a recent Monday morning. Dropped it off at the Dealer it was on my way to work. An hour later the service wrighter called said there was problem with the valve on cylinder #6 and the head needed to be replaced. He said they have a head in stock, replaced the head and picked up Tuesday afternoon. This did not take very long to fix in my case compaired to some of the other posts. I hope I don't have future problems.
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Old 06-19-2013, 11:20 PM   #103
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Hey all I found this article on the jeep wrangler cylinder misfire...
Chrysler to fix defect in 1,000 V-6 engines
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Old 06-19-2013, 11:51 PM   #104
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Hey all I found this article on the jeep wrangler cylinder misfire...
Chrysler to fix defect in 1,000 V-6 engines
Yeah. I saw something similar a while back. You know this article was posted in Aug 2012 right?

The article I saw went further to describe some kind of manufacturing quality issues that caused the problem with cylinder misfiring. I wish I could find it again.

Suffice it to say, I'm glad I have not had this problem. I've had VERY few issues with my 2012 JKUR
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Old 07-05-2013, 09:18 PM   #105
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Well here I am, right on cue. I'm right around 20,000 miles and my CEL is on. Code reader says cylinder 6 misfire. I've got an appt to take it in to the dealer tomorrow to have it looked at. I'm glad I read this thread because I think I'm now a lot less likely to accept a line of BS from them. What's really bad is I had a long road trip planned for next week and I don't think I'm lucky enough that they'll have the parts in stock and be able to get it fixed in time. And I hate to think what kind of loaner I'm going to get. The timing couldn't be any worse.
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Old 07-06-2013, 09:51 PM   #106
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Here's an update. Took it into the dealer today and told them I was pretty sure of the problem and I just need them to confirm it is the cylinder head. He says they'll try replacing the coil and some other minor stuff first and see if that fixes the problem. I asked him how many new Pentastars has he done that to and had the problem go away. He said NONE. I said then let's not waste our time on that and get down to brass tacks. I told him I want to know if my cylinder head is bad right now. He seemed resigned and didn't give me an argument but said it would take six hours as opposed to the two hours they estimated yesterday just to diagnose. I asked him how long after that to replace the head and he said he would have to order the part and have it shipped. I then blew up. I told him there was no excuse for not having those in stock because this has been a known issue for quite some time. He told me that Chrysler has made this a "restricted item" and dealers can now only get so many a month. Bottom line is I'm going to have to use their loaner, a Jeep Patriot for my trip but I should have all the work done when I get back.
To tell you the truth I'm glad this issue cropped up now so I can get it behind me. I don't care what they say, ALL of these engines (pre- head redesign) are vulnerable to have this happen at some point in their life. I'll post updates as they occur.
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Old 07-09-2013, 02:01 PM   #107
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I have the same issue... mine is at the dealership for 2 weeks.
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Old 07-13-2013, 02:08 AM   #108
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Happened to me today 7/12/13! My check engine light on my 2012 Rubicon came on today at 10,064 miles. Can't get into the dealer until Monday to have it checked out. Also, not sure if this has happened to anyone else but right after I bought the Jeep new last August I had a issue with a transmission leak out if the lines because they were overlapping I believe the power steering lines. Can't wait to see what the dealer tells me about the light. Will keep you posted.
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Old 07-14-2013, 07:20 AM   #109
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Check Engine Light - Cylinder 6 Misfire

Same thing happened to mine...2012 Wrangler Unlimited Altitude. They are going to have to open up your engine and replace the cylinder head. Don't let them tell you anything different. They did this to mine and its been running fine since then. The work is under warranty as it is a recall.
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Old 07-15-2013, 08:30 AM   #110
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I got my Jeep back and it drives stronger than when I first purchased it.
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Old 07-16-2013, 06:18 PM   #111
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Well, I just got a call from my dealer that my Jeep is done but I'm still on vacation with their brand new Dodge Durango. I have to admit this is a pretty sweet ride and has probably been a much better highway vehicle than my Jeep would have been. Also there will be about 2500 miles less wear on my own vehicle so maybe there is a silver lining to this. One thing I want to ask you all is if there is anything I need to ask them or look for when I pick it up to ensure the job was done right, or do I just drive it away and monitor it for leaks and other oddities? Thanks.
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Old 07-19-2013, 08:03 PM   #112
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Cylinder #6 misfire

Just got my 2012 Jeep Wrangler Sport back from the dealer. New vehicle with 28,000. miles and had to replace cylinder head. My second jeep, but first Wrangler and I love it. I have always got 19 MPG out of my Jeep Wrangler, today on a short trip I'm only getting 11.8 MPG. What could be wrong with it now. I will contact the dealer Monday. Has anyone had this problem or any ideas? Thanks
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Old 07-20-2013, 11:03 AM   #113
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Just got my 2012 Jeep Wrangler Sport back from the dealer. New vehicle with 28,000. miles and had to replace cylinder head. My second jeep, but first Wrangler and I love it. I have always got 19 MPG out of my Jeep Wrangler, today on a short trip I'm only getting 11.8 MPG. What could be wrong with it now. I will contact the dealer Monday. Has anyone had this problem or any ideas? Thanks
Of course it all depends on how it was driven during that short trip vs when you were getting 19. . Maybe drive it a little more to get a good average. I just got mine back from the dealer yesterday. So far the mileage seems to be about the same. It's too soon to tell for sure though. I am still apprehensive that they forgot to tighten something down, reconnect something, or some other little thing that will crop up later. BUT....I'm still glad to get this behind me....maybe......hopefully.
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Old 07-24-2013, 08:09 PM   #114
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Same deal here. Takin it in tomorrow. Cylinder 6 misfiring at 18,500. Not happy but at least Im not alone.
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Old 07-25-2013, 12:26 AM   #115
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Originally Posted by Jakesdad View Post
Well, I just got a call from my dealer that my Jeep is done but I'm still on vacation with their brand new Dodge Durango. I have to admit this is a pretty sweet ride and has probably been a much better highway vehicle than my Jeep would have been. Also there will be about 2500 miles less wear on my own vehicle so maybe there is a silver lining to this. One thing I want to ask you all is if there is anything I need to ask them or look for when I pick it up to ensure the job was done right, or do I just drive it away and monitor it for leaks and other oddities? Thanks.
You should be able to ask to see the old head and have the show you the numbering on the new head, which should be a build date after 20612. You can check out this thread on how to ID your head's date - http://www.wranglerforum.com/f33/doe...ad-198794.html
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Old 07-25-2013, 03:35 PM   #116
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Shit man, i have 24,000 miles on my 2012 JKU...purchase in October 2011...and now im shittin my pants......if my cylinder has to misfire, then i hope it happens under warranty..........this is bullshit
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Old 07-31-2013, 04:08 PM   #117
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15,500 miles on my 2012 JK, and got a Cylinder #2 misfire. Dealer was well aware of the cylinder head issue, but said they have had some success with a re-flash of the PCM. 10 miles later - CEL lights up with cylinder #2 misfire. Called the dealer. Bringing it back to get the head replaced.

FWIW - my Build Date is 10/2011.
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Old 07-31-2013, 04:46 PM   #118
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Got a cylinder 6 misfire. I'm planning on travelling 1500 miles round-trip this weekend, will this be a problem? I haven't noticed anything different with how it drives. I've gone on a couple of 200 mile trips the last couple of weeks since it came on and haven't noticed anything. The dealer wouldn't recommend driving on it, but he wouldn't say I can't drive on it either.

(I just hit 20,000 miles fyi, 2012 Unlimited Sahara, got it in May 2012)

What do you guys think?
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Old 07-31-2013, 07:23 PM   #119
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I'm at 34k and have not had a problem. I ordered my Jeep in Sept '11 and took delivery in Nov '11. I was built in Oct/Nov. at some point there was a delay. For several weeks. I wonder now if that was when they discovered and fixed the issue.

I read the page on finding your build date, but was unclear because it went back and forth. Has anyone successfully identified the date?
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Old 07-31-2013, 07:47 PM   #120
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Friends, I called Chrysler Customer Service number today and had a nice conversation with the rep about this problem. I obviously have concerns about this problem and i needed warranty details. So some of you may know and others wont BUT from what she explained to me, the Cylinder head is part of the 100,000/5 year powertrain warranty that comes with all our Jeeps. Most of us, God willing will be driving and enjoying our JKs well beyond 100,000 miles (Hopefully) so if this cylinder needs to misfire, it needs to happen now so it can be fixed....OR they may recall them all just to replace the HEAD with a more "Robust" one. I have 24,000 miles on mine, Purchased in October 2011, and she runs strong and no ticking noises or anything like that....My only concern is that it seems like it will eventually catch up with every single engine...trying to still figure out why some are effected and others not "Yet"......By the way, off topic, but the Customer Service rep did mention there is a recall notice going out next week about the Transmission Cooler line......no idea what that is but i guess i will be bringing in her in soon..........

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