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Old 05-02-2014, 08:32 AM   #1
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P0304 - Misfire Cylinder #4

Anyone get this code and it not be related to the head? I have 29K on my 2012 and seems like if it was the head issue I should have already had issues.

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Old 05-02-2014, 05:39 PM   #2
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I had this issue with my 08 JKU, it had 120K on it and cylinder 5 and 6 were misfiring and i was losing oil fast. i took it to the dealership and it my cylnders were worn and i ended up getting a refurbished engine (top block) luckily my insurance company paid for it. you should still have the warranty though id get it checked though.
hope this helps

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Old 05-02-2014, 05:52 PM   #3
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You need a new head. 2012 MY with a misfire on even cylinders is pretty much a complete given. people have had head failures at up to 70k. There is no safe mileage.
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Old 05-02-2014, 06:31 PM   #4
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All 2012's are destined to have head failures. Just at different mileage points!
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Old 05-02-2014, 09:02 PM   #5
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Thanks everyone got an appt with the dealer tomorrow so we will see how that goes
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Old 05-03-2014, 07:46 PM   #6
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Dealer confirmed it needs a new head. Replacement will arrive on Monday so I should have my jeep back soon. Only downside is the loaner is a Camry
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Old 05-05-2014, 08:42 AM   #7
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nknacd - Did the dealer give you a hard time? I got the light on my '12 JKU and just got it scanned. Mine is the #2 cylinder. I am going to call dealer today, but I am already envisioning them giving me the song and dance (bad gas, loose nut on the steering wheel, etc).
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Old 05-05-2014, 09:25 AM   #8
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My 2012 build date of Dec 2011 is throwing PO302 code. Sure mine is head issue too. Just aint got it in yet.
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Old 05-05-2014, 09:28 AM   #9
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I had 30K on my 2012 JK when my head went. I was hunting up in Maine and it through the code on an old logging road. Had to limp it back from Maine to RI and my dealer replaced it without issue. Unfortunately it is a common issue with the 2012s. Downside was that they didn't flush the coolant.
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Old 05-05-2014, 09:55 AM   #10
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Quote:
Originally Posted by KEH_2012 View Post
I had 30K on my 2012 JK when my head went. I was hunting up in Maine and it through the code on an old logging road. Had to limp it back from Maine to RI and my dealer replaced it without issue. Unfortunately it is a common issue with the 2012s. Downside was that they didn't flush the coolant.
Mine has 14k on it. Been throwing 302 code for last 3 months. It seems to run ok when it comes on other than ECO no longer shows by odometer. I can clear it and it may stay off for a week or might show up next day. Going to try get it in this week and maybe get transmission/power steering line recall fix IF they have the parts.
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Old 05-05-2014, 09:59 AM   #11
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Billabong73, i didn't mention that i new about the issues when i took it. I figured i'd see what they have to say first. at first the service guy said its probably a spark plug but they will check it over to make sure. 45 mins later he came to get me and said he has some bad news and they want to get me over to the rental car place before they close as they will need to keep it. So far it hasn't been a hassle other then having to take it and drive around in a camry.
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Old 05-12-2014, 08:45 AM   #12
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Brought it to dealer (that I purchased from) Thursday morning. A few hours later, got the call, "It's a bad head. Common thing. We have it in stock (!!!). Do you want us to do it now or schedule for another day?" "Uh, yeah, do it."
Got it back Friday night. Running smooth. They did a nice job. Engine compartment looks clean. They changed the coolant too.

Maybe the fact that I bribed them with Dunkin Donuts when I dropped it off helped?

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