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Topic Review (Newest First)
04-20-2014 10:54 AM
Frogy 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
04-20-2014 10:37 AM
blackrubicon
Quote:
Originally Posted by RockyRiverJeep View Post
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.
04-19-2014 10:51 AM
RockyRiverJeep 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!
04-18-2014 05:57 AM
2013 Moab Yeah I would definatly be getting that issue documented with the dealer before your warranty expires
04-18-2014 04:56 AM
demarpaint
Quote:
Originally Posted by blackrubicon View Post
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.
04-18-2014 03:52 AM
blackrubicon
Quote:
Originally Posted by demarpaint View Post
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
04-17-2014 09:16 PM
demarpaint
Quote:
Originally Posted by blackrubicon View Post
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?
04-17-2014 06:32 PM
blackrubicon
Quote:
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.
04-17-2014 09:00 AM
wat3rdog
Quote:
Originally Posted by wat3rdog View Post
I have a 13 built in Oct of 12. I got the P300 code with an O2 sensor code and a Cylinder 1 ignition circuit error. They cleared my CEL and the Tech needs to research my cylinder codes. When I brought it in it seemed to be running fine. It started on a Thursday ride home from work. CEL came on just before the driveway and she was idling real rough. My scanner also noted bank 2 Lean after a bit.
I then drove my Jeep for a week waiting for a Cel. Took it back for a seperate issue and on the way home the CEL finally came back which was last Saturday evening. Then on Monday the CEL went away and has yet to return.
Cat and mouse game for now it seems.
Aslo while at the dealer Chrysler required an ECU flash last Saturday. Apparently it was in the Tech notes for my particular model.
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.
04-16-2014 09:41 AM
grizzstang
Quote:
Originally Posted by rox-n-mud View Post
That metric system sure is awesome.
Nothing wrong with the metric system it is the car manufacturers that are screwing us but it is starting to change. I see Chevy trucks are now warrantied to 160,000 km in Canada.
04-15-2014 08:02 PM
gecko4 If you were in Canada, you'd be out of the warranty period. Hopefully, Chrysler covers it beyond our 100000km (60000mile) warranty. I'll have to talk to my buddies at the dealership, see if they've done any beyond 100000k's
04-15-2014 05:04 PM
TiggerRC 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.
04-14-2014 08:25 AM
blackrubicon 2102 13k on it build date 12-11. Threw PO302 code for 3rd time in last 3 months. No tick no misfire. Suppose it's time to take it in. Chrysler should be embarrased as hell over this screw up. Henry Ford was building engines 100 years ago. Hard for me to understand how an issue with head could haapen. Not sure if its a error in manufacturing or engineering screw up. Needless to say I'm very unimpressed with the overall quality. But should have expected it after Chrysler took over.
04-12-2014 10:03 PM
TiggerRC FWIW, my jeep has always been parked outside in a carport since new and almost never warmed up before driving. Granted I never rev it over 2000 rpm or so for the first 1-2 miles. I have run Schaeffer's full synthetic with moly ever since break in. Not sure that has helped or not.

I've changed oil and filter every 8k and with oil analysis done on every change for warranty reasons. Every analysis has come back with the recommendation to extend oil drains to 10k or more. Its used 5-6 days a week for mail delivery rain, shine, snow or cold. Not abused but never babied. Two winters with several weeks of sub-zero starts each winter. I Just turn the key and go.
04-12-2014 09:25 PM
Muddr1 I had just about 40,000 on mine before it threw a code and got the head replaced.
From what I was told, by two techs, if you let the jeep warm up and treat it nice, it will take longer for the issue to rear its head.
If your the one whe jumps in on a cold day and head out before the engine is warm and happy, the sooner youll be in for head replacement.

Again not my words, so take it for what its worth.
04-12-2014 08:30 PM
snobnk 2012 with 40000+ and no tick...Jinks
04-12-2014 07:19 PM
BigManAndy Was just thinking about this today. 2012 just rolled over 20k and no ticks and original heads.
04-12-2014 03:27 PM
xox.ilu.xox I have a 2010 JKU and mine needs a new engine after it started making "lifter" noise. We took it in right away. Dealership says it needs a new engine. Been two weeks with no word from Chrysler Canada. Pisses me off. Just want my jeep back im having major widrawals.
04-12-2014 10:18 AM
demarpaint I'd hope the thing failed early. I would not want a head with lets say 50,000 miles on one side of the engine and a brand spanking new head on the other side of the engine. JMO
04-12-2014 09:32 AM
Frogy
Quote:
Originally Posted by TiggerRC View Post
Well it finally happened. P0304 = misfire cyl #4 at 63,000. Approximately 3 weeks after I noticed the misfire at the tailpipe during idle. I've had the tick since below 20k. Headed to the dealer on Tuesday. I'm curious if it took more miles for mine because I used syn oil or because I live in a cooler climate or none of the above.

Edit: In reality its almost 70k since my tires are 10% bigger then stock.
That's interesting that you noticed a misfire before it set a code, it was the same for me. So if people are failing heads at 60K or higher what's to say that this won't happen at 101K? I called Chrysler warranty to complain about poor quality and I got the standard "there isn't a problem with the heads because there hasn't been a recall" response. I've seen one person state that they had a passenger side head replaced, how long will it be before that side comes to roost?
04-11-2014 07:18 PM
TiggerRC Well it finally happened. P0304 = misfire cyl #4 at 63,000. Approximately 3 weeks after I noticed the misfire at the tailpipe during idle. I've had the tick since below 20k. Headed to the dealer on Tuesday. I'm curious if it took more miles for mine because I used syn oil or because I live in a cooler climate or none of the above.

Edit: In reality its almost 70k since my tires are 10% bigger then stock.
04-08-2014 04:13 PM
Frogy I brought my Wrangler into the dealer today, they looked at and ordered the parts, the new head will go on next Monday
04-07-2014 10:30 AM
siddious33
Quote:
Originally Posted by siddious33 View Post
Dropped my Jeep off first thing this morning and when I called this afternoon they were already putting a new cylinder head on her. Chalk one up for this dealer not beating around the bush. They weren't able to get done today and finish my oil change and tire rotation, so I'll have to pick her up tomorrow, but huzzah for not having to go through multiple trips to get the cylinder head.

They said the first thing they did was check the compression and noted it was failing so, new cylinder head it is!
Just got my JK back this morning. Pouring down rain here in Charlotte, so I have not looked under the hood yet, or driving it with the windows down, but I did notice that when I cranked it to leave the dealer there was no ticking anymore, which is nice.

Also got the multifunction switch on the left side of the steering wheel replaced as my windshield wipers would make a swipe or two when you used the right turn signal. LOL>
04-05-2014 03:58 PM
Frogy
Quote:
Originally Posted by gecko4 View Post
The left bank is cyl 2,4,6
The right bank is 1,3,5
thanks for the info, mine doesn't tick, but it seems like my fuel milage is in the dumps, I got 17MPG on the highway today. I got 21 last weekend on the same trip. It makes me wonder if the computer has separate "safe" fuel maps that it runs when the MIL light is on. my ECO light has not come on since I set the code this morning.
04-05-2014 03:23 PM
gecko4
Quote:
Originally Posted by Frogy View Post
I had a MIL last weekend (P0306) and I cleared it because I hate seeing warning lights. After clearing the code I called my dealer to talk to them about getting in for service. My mistake, apparently they would not look at my vehicle unless there was a code present? Anyway it set another couple of codes this morning (P0300 and P0304) and I called the dealer to schedule a visit. The question I have now is that I would think that a cylinder #4 misfire would be on the right bank not the left bank? I did notice a couple people that have had heads replaced said that they had a P0304 as well? Just for informational purposes my Jeep is a 2012 2 door sport s manual with 28k miles. Harlow
The left bank is cyl 2,4,6
The right bank is 1,3,5
04-05-2014 03:01 PM
Frogy I had a MIL last weekend (P0306) and I cleared it because I hate seeing warning lights. After clearing the code I called my dealer to talk to them about getting in for service. My mistake, apparently they would not look at my vehicle unless there was a code present? Anyway it set another couple of codes this morning (P0300 and P0304) and I called the dealer to schedule a visit. The question I have now is that I would think that a cylinder #4 misfire would be on the right bank not the left bank? I did notice a couple people that have had heads replaced said that they had a P0304 as well? Just for informational purposes my Jeep is a 2012 2 door sport s manual with 28k miles.

Harlow
04-02-2014 09:19 PM
siddious33
Quote:
Originally Posted by siddious33 View Post
Sigh. I have a 2012 JK. Not quite to 20k miles and just got the P0304 code today when I got home. Will be calling the dealer in the morning to set up a time to go in and probably get the runaround. Great. Was looking forward to a weekend trip to the mountains this weekend too and now I feel like I can't take the JK.
Dropped my Jeep off first thing this morning and when I called this afternoon they were already putting a new cylinder head on her. Chalk one up for this dealer not beating around the bush. They weren't able to get done today and finish my oil change and tire rotation, so I'll have to pick her up tomorrow, but huzzah for not having to go through multiple trips to get the cylinder head.

They said the first thing they did was check the compression and noted it was failing so, new cylinder head it is!
04-02-2014 09:00 PM
demarpaint
Quote:
Originally Posted by wat3rdog View Post
I have a 13 built in Oct of 12. I got the P300 code with an O2 sensor code and a Cylinder 1 ignition circuit error. They cleared my CEL and the Tech needs to research my cylinder codes. When I brought it in it seemed to be running fine. It started on a Thursday ride home from work. CEL came on just before the driveway and she was idling real rough. My scanner also noted bank 2 Lean after a bit.
I then drove my Jeep for a week waiting for a Cel. Took it back for a seperate issue and on the way home the CEL finally came back which was last Saturday evening. Then on Monday the CEL went away and has yet to return.
Cat and mouse game for now it seems.
Aslo while at the dealer Chrysler required an ECU flash last Saturday. Apparently it was in the Tech notes for my particular model.
I have a feeling your issue is not related to a bad cylinder head. Hopefully they get to the bottom if it for you. Good luck!
04-02-2014 08:08 AM
wat3rdog I have a 13 built in Oct of 12. I got the P300 code with an O2 sensor code and a Cylinder 1 ignition circuit error. They cleared my CEL and the Tech needs to research my cylinder codes. When I brought it in it seemed to be running fine. It started on a Thursday ride home from work. CEL came on just before the driveway and she was idling real rough. My scanner also noted bank 2 Lean after a bit.
I then drove my Jeep for a week waiting for a Cel. Took it back for a seperate issue and on the way home the CEL finally came back which was last Saturday evening. Then on Monday the CEL went away and has yet to return.
Cat and mouse game for now it seems.
Aslo while at the dealer Chrysler required an ECU flash last Saturday. Apparently it was in the Tech notes for my particular model.
04-02-2014 06:15 AM
demarpaint
Quote:
Originally Posted by Rabblerouser View Post
A guy I know just told me his threw the code. I asked what year he had. 2014!!!!
Too soon to tell. It could be a bad coil pack, or a plug. We need a lot more info, the actual diagnosis will be nice. Subscribed again.
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