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Old 04-17-2014, 06:32 PM   #5881
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Originally Posted by wat3rdog View Post
An update on my particular situation. It seems that the Flashing of the ECU may have corrected my issue. Knock on wood. I've put quite a few miles on here and a few tanks of fuel. The CEL has not come back at all and running great. I am a pretty aggressive driver so I would hope that if there's an issues it would return. I'm thinking at this point it was a hiccup in the computer management system.
I have cleared mine 3 times in last 3-4 months. Runs fine just sets check engine light and shows PO302 code. My question is what is it really trying to tell me. Is a catastrophic failure on the way or what? I have a scangage II on mine and I have even monitored the gas mileage with it on and see no difference. The ECO on odometer wont come on though.

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Old 04-17-2014, 09:16 PM   #5882
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I have cleared mine 3 times in last 3-4 months. Runs fine just sets check engine light and shows PO302 code. My question is what is it really trying to tell me. Is a catastrophic failure on the way or what? I have a scangage II on mine and I have even monitored the gas mileage with it on and see no difference. The ECO on odometer wont come on though.

Misfire in cylinder 2, if it came back 3 times in 3-4 months there is a problem. What year is it?

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Old 04-18-2014, 03:52 AM   #5883
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Misfire in cylinder 2, if it came back 3 times in 3-4 months there is a problem. What year is it?
2012 13k miles built Dec, 2011
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Old 04-18-2014, 04:56 AM   #5884
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2012 13k miles built Dec, 2011
Next time you have the code bring it back, odds are you have a bad head with the code you're getting.
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Old 04-18-2014, 05:57 AM   #5885
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Yeah I would definatly be getting that issue documented with the dealer before your warranty expires
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Old 04-19-2014, 10:51 AM   #5886
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My driver's side head was replaced last June on my 2012 Wrangler.

I agree with demarpaint, when the code comes on again don't clear it. (BTW, they should still be able to see the previous codes you erased.) Take it to the dealership and let them do a diagnostic scan. If the CEL is related to the No. 2 cylinder, they should do a leak-down test to confirm a problem. Worst case scenario: It passes the test and you pay for the leak-down test. Odds are the cylinder will fail it. You will get a new head.

This is not a catastrophic/safety issue, that's why there was no recall. Usually there is ticking with a loss of mileage. Sometimes there are no symptoms. The fact that you have had (3) CEL's with the same code needs further investigation.

If a new head is needed, immediately call Chrysler Customer Care and report the situation to them. You will get a case number and give that to the dealership so there's no issue with getting a free loaner car while your vehicle is repaired. Figure on 1-3 days to complete the repair depending on part availability.

Lastly, ensure the dealership carefully purges the air out of the coolant system and confirms that your thermostat is functioning properly before you pick it up. Your mileage might go down a few clicks after the repair. That is normal and will return to usual mileage in a couple weeks or so of normal driving.

Good Luck!
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Old 04-20-2014, 10:37 AM   #5887
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My driver's side head was replaced last June on my 2012 Wrangler. I agree with demarpaint, when the code comes on again don't clear it. (BTW, they should still be able to see the previous codes you erased.) Take it to the dealership and let them do a diagnostic scan. If the CEL is related to the No. 2 cylinder, they should do a leak-down test to confirm a problem. Worst case scenario: It passes the test and you pay for the leak-down test. Odds are the cylinder will fail it. You will get a new head. This is not a catastrophic/safety issue, that's why there was no recall. Usually there is ticking with a loss of mileage. Sometimes there are no symptoms. The fact that you have had (3) CEL's with the same code needs further investigation. If a new head is needed, immediately call Chrysler Customer Care and report the situation to them. You will get a case number and give that to the dealership so there's no issue with getting a free loaner car while your vehicle is repaired. Figure on 1-3 days to complete the repair depending on part availability. Lastly, ensure the dealership carefully purges the air out of the coolant system and confirms that your thermostat is functioning properly before you pick it up. Your mileage might go down a few clicks after the repair. That is normal and will return to usual mileage in a couple weeks or so of normal driving. Good Luck!
Thanks for all the info. I figure its head issue! Came on twice yesterday so its getting worse. Left it on calling dealer in morning. You say they will provide a loaner if i contact chrysler? That would be sweet. Even when i cleared codes scangage showed previous codes. I would guess head would have to be ordered. Thanks again.
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Old 04-20-2014, 10:54 AM   #5888
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The head on my 2012 was replaced last week at about 28.5k miles the thermostat housing was replaced at the same time. I thought it might be interesting for others in a similar situation, given that I thought I wasn't going to see the issue having not had a problem at lower mileage. I have also heard people say that they got better fuel mileage after the change than they did before, and I have not seen that, although I have returned to near "normal", or maybe just a little on the low side (19 HWY).

I noticed about a month ago that my wrangler was running a little more roughly as evidenced by movement of the stick shift (before video attached). Two weeks after I noticed the roughness I had a CEL or MIL. I cleared a p0300 and p0302 and called the dealer. Given that I cleared the light the dealer wouldn't look at my Jeep. I waited about another week and the codes set again. I brought the Wrangler to the dealer and they did a pressure test that failed the drivers side head. I noted about a 4mpg drop on the highway and slightly worse mileage in the city. Now the head has been replaced with an AC version head and it runs much more smoothly (as shown in the after video. I never really noticed any ticking other than injector noise.

before
before - YouTube

after
after - YouTube
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Old 04-28-2014, 11:40 AM   #5889
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hello folks...i am about to go look at a used 2012. quick question...if the jeep falls out of warranty and there is a problem with the head...am i $hit out of luck?
Or will Jeep still cover it?

Thanks!
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Old 04-28-2014, 11:46 AM   #5890
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hello folks...i am about to go look at a used 2012. quick question...if the jeep falls out of warranty and there is a problem with the head...am i $hit out of luck?
Or will Jeep still cover it?

Thanks!
Out of warranty SOL. If its at a dealership ask, that will probably open the door for the sale of some kind of extended warranty. Why not ask if the head was replaced, and if the replacement as an AB or an AC head. Better yet get the #'s off the left cylinder head and see for yourself. Honestly if it doesn't have an AC head I'd pass.
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Old 04-28-2014, 09:45 PM   #5891
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Well they diagnosed my Jeep and ordered a new head. Should be here in a week. Has anyone had a 2012 with an AA left head that made it further then mine? 63,000 on odo but tires 10% large so 69,000 equivalent.
Also fwiw, I've put 400 miles on since the CEL and they said it will be fine to drive it until parts arrive so at least when it happens it doesn't leave ya sit.
New AC head installed. Dealer had it 3 days. No misfire, no tick and no more valve clatter on cold start! No loaner car even after calling Chrysler customer care. Since its a small dealer with no loaner cars and no Enterprise rentals in the area.
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Old 04-28-2014, 11:25 PM   #5892
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just posting this as a courtesy data point for the community. right on schedule at 29,200 miles the engine light came on.

they diagnosed it today and said indeed #6 was gone. they were familiar with the issue on the 3.6 engine and didn't hesitate to order a new head.

my jeep is a 2012 with a 2011 build date.

there was also a recall for some transmission related hose. don't know the details but didn't care since they are taking care of it.
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Old 04-29-2014, 12:21 AM   #5893
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Why not ask if the head was replaced.
You can ask, but that is proprietary information if you are not the original owner of the vehicle... Chrysler and the dealer have no obligation to tell you.

I have it in writing from them.
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Old 04-29-2014, 07:11 AM   #5894
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Originally Posted by bostongmw View Post
just posting this as a courtesy data point for the community. right on schedule at 29,200 miles the engine light came on.

they diagnosed it today and said indeed #6 was gone. they were familiar with the issue on the 3.6 engine and didn't hesitate to order a new head.

my jeep is a 2012 with a 2011 build date.

there was also a recall for some transmission related hose. don't know the details but didn't care since they are taking care of it.
I was under the impression it was usually #2. Mine is throwing PO302 code. Guess the whole damned head is nothing but a boat anchor. I'm trying to get mine in. Dealer is in no hurry. My build date was Dec. 2011. 13k miles when it started.
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Old 04-29-2014, 07:47 AM   #5895
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I asked the service manager of one of the big dealers in Denver area about their repair rate, and he said they do about 1-2 a week - "not that many" ...
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Old 04-29-2014, 08:42 AM   #5896
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I asked the service manager of one of the big dealers in Denver area about their repair rate, and he said they do about 1-2 a week - "not that many" ...
1 or 2 in my opionion is TOO many. I have been around cars and engines for 50+ years and never had an issure with heads other than maybe worn valve guides. That was only after 100k + miles. Am I correct that this was not a NEW engine? It had been around in other vehicles. Just new to the Wrangler? Has Chrysler ever admitted if it was a manufacturing defect or just piss poor design?
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Old 04-29-2014, 12:20 PM   #5897
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You can ask, but that is proprietary information if you are not the original owner of the vehicle... Chrysler and the dealer have no obligation to tell you.

I have it in writing from them.
If that's the case [I believe you] then I'd get the numbers off the head myself if I was interested in buying the Jeep. Bottom line for me is if it has anything but an AC head on it I'd look for something else.
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Old 04-29-2014, 12:42 PM   #5898
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has anyone posted info on how/where in the engine to look for the product numbers off the head? i'm not quite sure where to look...thanks!
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Old 04-29-2014, 01:03 PM   #5899
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has anyone posted info on how/where in the engine to look for the product numbers off the head? i'm not quite sure where to look...thanks!
Update on ticking Pentastar..new head...
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Old 04-29-2014, 04:21 PM   #5900
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thank you Blastek! will check the 2012 my wife bought last night....when i get home frome work.

Regardless...i beleive we will buy the chryslerwarrantys.com lifetime "added care" package.
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Old 04-29-2014, 09:14 PM   #5901
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ok, numbers of the head are 2361A, build date is 8/2011...I suppose this means mine falls under the higher risk category correct?

it has 32k miles on it...will sign up for extended warranty!
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Old 04-30-2014, 05:28 AM   #5902
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ok, numbers of the head are 2361A, build date is 8/2011...I suppose this means mine falls under the higher risk category correct? it has 32k miles on it...will sign up for extended warranty!
Just watch what you pay for the extended warranty. You might end up paying more for that than the head job would cost. If you're the type that keeps a vehicle for a long time, it may be worth it, but if you only keep them for 4 or 5 years, I probably wouldn't bother. You still have close to 70k of warranty left on the head, that's more than us Canadians get from new!
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Old 05-06-2014, 03:47 PM   #5903
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Well, I'm officially a victim of the dreaded head problem. What's worse for me is that I'm traveling and am about 800 miles away from home, and the Jeep is in the shop right now getting the head replaced. Work should be completed tomorrow afternoon, but tomorrow morning was when I was supposed to check out of the hotel start traveling back home, so the timing of this issue is potentially causing me a hotel issue. In any case, the dealership doing the work (Safford in Springfield VA) seems to know what they're doing and I have faith it'll be done on time and correctly, but the timing does give me some anxiety and bring me to a question.

Is it safe for me to hit the highway immediately after the repairs are completed and put the Jeep through an 800 mile journey, or do the new parts installed during the head replacement require any sort of break-in period?
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Old 05-06-2014, 04:09 PM   #5904
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Well, I'm officially a victim of the dreaded head problem. What's worse for me is that I'm traveling and am about 800 miles away from home, and the Jeep is in the shop right now getting the head replaced. Work should be completed tomorrow afternoon, but tomorrow morning was when I was supposed to check out of the hotel start traveling back home, so the timing of this issue is potentially causing me a hotel issue. In any case, the dealership doing the work (Safford in Springfield VA) seems to know what they're doing and I have faith it'll be done on time and correctly, but the timing does give me some anxiety and bring me to a question.

Is it safe for me to hit the highway immediately after the repairs are completed and put the Jeep through an 800 mile journey, or do the new parts installed during the head replacement require any sort of break-in period?
It's safe. Actually, you would have been fine to wait until after you got back home to have the head replaced.
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Old 05-06-2014, 05:20 PM   #5905
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Well, I'm officially a victim of the dreaded head problem. What's worse for me is that I'm traveling and am about 800 miles away from home, and the Jeep is in the shop right now getting the head replaced. Work should be completed tomorrow afternoon, but tomorrow morning was when I was supposed to check out of the hotel start traveling back home, so the timing of this issue is potentially causing me a hotel issue. In any case, the dealership doing the work (Safford in Springfield VA) seems to know what they're doing and I have faith it'll be done on time and correctly, but the timing does give me some anxiety and bring me to a question.

Is it safe for me to hit the highway immediately after the repairs are completed and put the Jeep through an 800 mile journey, or do the new parts installed during the head replacement require any sort of break-in period?
It's safe. I would pop the hood and check the oil, and coolant level, [safely] and look for leaks each time you stop for gas during that 800 mile trip. This way if something is screwed up you'll catch it early before it causes engine damage.
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Old 05-06-2014, 09:13 PM   #5906
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2012 41K miles, still no codes or issues. If I don't get something by 90K I may have to trade it in on a newer one, lol.
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Old 05-06-2014, 09:24 PM   #5907
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It's safe. Actually, you would have been fine to wait until after you got back home to have the head replaced.
I considered waiting because other than slightly less gas mileage and MAYBE a perception of having a bit less power, it seemed like the Jeep was still running well despite the check engine light being on for several days while I've been in Virginia. However, I don't know anything about head issues and wasn't sure if I could run into power problems or flat out breakdowns while heading back over the Appalachians. I had about 10 minutes to decide so...didnt want to take any chances going that far.

In any case, thanks for your response. I feel better. but I'll feel MUCH better if/when I get the Jeep back in good condition and on time tomorrow so I can hit the road.
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Old 05-06-2014, 09:26 PM   #5908
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It's safe. I would pop the hood and check the oil, and coolant level, [safely] and look for leaks each time you stop for gas during that 800 mile trip. This way if something is screwed up you'll catch it early before it causes engine damage.
Definitely will take that sound advice. Thank you!
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Old 05-09-2014, 08:47 PM   #5909
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Made it safely back home to Illinois after having the left side heads replaced in Virginia. The Jeep ran great, no problems with coolant or oil levels, and it kinda sorta seemed like the engine power felt smoother...not necessarily more powerful, but it did feel different. Before I had this work done I never really felt like the engine didn't run right or lacked power, but since it's been done I can say that I definitely notice that it feels smoother and more efficient, for lack of better words.

One more thing: initially the service rep told me that it was cylinder #2 that had the misfire problem, but after closing out the service ticket he realized he erred and verified that it was actually cylinder #6....just in case any of you care to know that tidbit.
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Old 05-17-2014, 12:28 AM   #5910
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Just got my Jeep back from the dealership. CEL P0304 misfire cylinder 4. 23,000 miles. Jeep build 02/27/12. Tech performed leak down testing procedure and verified 155 PSI and 55% leak down on cylinder #4. They replaced left bank cylinder head and gasket set.
They had my Jeep for 2 LONG days and gave me a rental car. I wasn't having any problems with how it ran. Now we'll see if it runs better?

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