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P0304 MIL Code Equaled Bad Cylinder Head

32K views 54 replies 19 participants last post by  Amatore  
#1 ·
Just an FYI for others to get the word out: 9,000 miles on a 2012 Rubicon and the MIL light came on. Jeep dealer said it was a TSB problem, applied the computer patch fix for something they claimed had to do with the valve timing, reset the code and gave the vehicle back.

The MIL was back on in an hour with the same P0304 code. The mechanic then tried telling us we had bad fuel. Told him we had read web info about people having bad cylinder heads with that code and he denied any knowledge of it. Made it clear we wanted the engine tested for compression, bad valves etc.

The mechanic basically threw his hands up and said he was going to put a "star" request into Chrysler and ask them what they wanted him to do with the vehicle?

The "star" request advised the mechanic to keep the vehicle, remove the intake and inspect the engine. Got word today that the cylinder head is bad.

The dealer states they have to order the parts and have no firm date of when we are getting vehicle back.

Only ray of sunshine in this mess is Chrysler is picking up the tab for a rental vehicle. We don't have an extended warranty or policy that is paying for the rental; Chrysler is doing it on their own, which is good because we are out of state on a vacation.

Again, just getting this out there for others. And you can't tell there is an actual engine problem just by driving the vehicle - at least we couldn't anyway.

I'll post the final outcome about how long it took them to fix it and what they replaced...
 
#3 ·
That sucks, but it happens for every manufacture. My best example is me putting an engine in a brand new $80,000 twin turbo V8 X6 while on it's "Pre-delivery Inspection" drive. It had four miles on it and rod knock!
 
#4 · (Edited)
On a separate note this was rather amusing too:

http://www.boston.com/cars/newsandreviews/overdrive/2011/11/kelley_blue_book_best_resale_values.html

According to this and similar news articles, the 2012 Jeep Wrangler is supposed to be the #1 vehicle when it comes to resale value.

Due to the fact that we are going to be doing some extensive travelling we floated the idea with the dealer of trading it in on a Grand Cherokee with the HEMI.

This Rubicon had an MSRP of slightly over $38k. We paid $1,000 under MSRP and didn't trade anything in that would skew the numbers.

This vehicle is in excellent condition with 9,000 miles. The dealer only offered us $29k in trade-in value.

KBB states the trade-in value for a like equipped 2011 Rubicon to be roughly $34k.

The Jeep dealer also had the nerve to cite the engine problem as one of the reasons for their low-ball trade-in value.

Today a BMW dealer only offered us $28k if we trade it into them.

So much for that "highest resale value of any vehicle." I'd sure hate to be driving the worst valued vehicle...
 
#36 ·
On a separate note this was rather amusing too:

http://www.boston.com/cars/newsandreviews/overdrive/2011/11/kelley_blue_book_best_resale_values.html

According to this and similar news articles, the 2012 Jeep Wrangler is supposed to be the #1 vehicle when it comes to resale value.
That's pretty much always been true.

This Rubicon had an MSRP of slightly over $38k. We paid $1,000 under MSRP and didn't trade anything in that would skew the numbers.

This vehicle is in excellent condition with 9,000 miles. The dealer only offered us $29k in trade-in value.

KBB states the trade-in value for a like equipped 2011 Rubicon to be roughly $34k.
I wonder how KBB calculates their vehicle value reports. Don't take this the wrong way, but given the choice to buy a used JK for $37k ($34k trade + $3k costs and dealer profit) or a new one for ~$42k, I don't think there's many folks choosing used. And every month that vehicle sits on the lot it looses more value and costs more in holding fees. But just like the new purchase price, trade-in value is negotiable.

The Jeep dealer also had the nerve to cite the engine problem as one of the reasons for their low-ball trade-in value.
Obviously there is no factual basis for this, but it is a negotiating tactic. Manufacturing defects are the manufacturer's liability during the warranty period. The dealer does the work right and any problem is fixed, while Chrysler reimburses all the costs including shop time and overhead. Dealers actually MAKE MONEY on warranty service, some times LOTS OF MONEY if they have good techs, because the actual repair time almost always averages out less than the book time. A TSB-related repair, once fixed, will rarely occur again due to the amount of study and testing done to determine and correct the root cause.

Today a BMW dealer only offered us $28k if we trade it into them.
Again, not surprising. People don't go to a BMW dealer looking for a used Jeep. To make it worthwhile, a BMW dealer has to pay a low enough price to resell to another lot or auction at a small profit, or advertise an attractive deal.

Reserve the rental on a credit card that includes coverage for rental cars and you don't need to pay rental insurance.
Read your credit card issuer's terms and conditions on this coverage. Usually this only applies if the full amount of the rental is charged to the card. So if you are paying the rental out of pocket and getting reimbursed by the dealer or your insurance company, then you are covered. BUT if you are only using the card as a guarantee against damages, or paying a portion of the daily rental costs, you probably are not covered.

According to the mechanic ... He went on to state that Chrysler won't repair anything that isn't over a 15% loss in compression.
I'd want to see the TSB on that, but wouldn't be surprised. A TSB documents a common failure mode and repair. But just because the problem is not within the parameters of the TSB does not mean it can't be covered under your warranty or service contract.

... he stated that TSB's are not performed on any vehicle unless the customer specifically asks for them to be performed or a problem described by a TSB has occurred.
That is industry standard practice. If it ain't broke, don't fix it. If the amount of failures reported to the NHTSB doesn't indicate a recall, then prophylactic replacement of parts with a statistically low occurrence of failure makes no economic sense. Chrysler is doing the right thing with TSB's: making it easy for customers to get satisfaction for common problems without unnecessarily increasing their costs, which ultimately feeds back into the price of vehicles.

Apparently Chrysler has to pay for any work performed by a dealer and a TSB isn't mandatory work, so they don't get done unless they fit the above criteria.
That statement is a bit twisted. Chrysler has to honor its warranty and service contracts. Whether or not a defect or covered failure is documented by a TSB, Chrysler has to reimburse the dealer for the parts and shop time required to correct the defect. If your vehicle is experiencing performance problems, misfiring, or throwing codes, ESPECIALLY if they affect emissions, the dealer is responsible to repair them and Chrysler is obligated to reimburse the dealer. But Chrysler does get to set the threshold on when an issue is worth repairing. While we all expect our vehicles to run perfectly, there are reasonable margins of tolerance. If you disagree with Chrysler's definition of "reasonable," you can always pursue other legal options.

Dropped the rental off at Enterprise, who in turn was supposed to drop us off at the dealer, and got hit with a request to pay a $200 detailing fee to clean the vehicle.

The clown at Enterprise rental stated that because we had put our dog in the rental car, which of course caused dog hair to be in the rental car (a Dodge Journey) we had to pay for detailing to remove the dog hair so the next customer didn't get sick.
[...]
The Enterprise guy choked and agreed to drop the $200 cleaning fee...
That's pretty standard in rental car contracts, the same usually applies if you smoke in the vehicle. You signed the contract with Enterprise, not the dealer, you should have caught that before you signed. You got lucky that the Enterprise guy was reasonable. Lesson learned.

"as for the carfax thing... thats going a little far IMHO. just keep the service record if/when trade or sale comes up. should be easy to explain... although you shouldn't have to."

The Carfax thing is pissing me off. It's one more example of erosion of privacy. I don't think it's anybody's business when you get your vehicle serviced, oil change etc.

I'm very curious if I have signed something that allows my private information to be turned over to Carfax. Are they turning it over for free or selling it?


That's a valid complaint, IMHO. Police accident reports are public records, legally accessible according to the law. Vehicle service records are transactions between private entities, and do not fall into the domain of public records. The gray area is whether there's a case to be made that these records are PROTECTED private information. Generally, to be protected the data has to identify an individual and unique person. A VIN identifies a vehicle and CarFax does not reveal the owner's name or address, which would be considered Personally Identifiable Information (PII). Still, as a private transaction you should be given an opportunity to opt-out of the reports.

But a service record is a record of a problem fixed. If I was looking for a used 2012 JK and learned about common problems, I would choose a vehicle where the problem's already been addressed rather than one where it would be a possible future expense. Save your maintenance and repair records, write notes on them as necessary to document the work. A solid paperwork trail of regular maintenance and timely repairs should allay any concerns from a reasonable buyer.

Notice how they have a dealer version of Carfax and a Consumer version. Kelley Blue Book works that way and somehow the dealer ended up with a black book that has much lower values.
That's always been true. NADA Guides was the standard reference long before the Internet existed, and is still favored by dealers today. They were available in "Blue" consumer versions and "Black" dealer versions. The "Black" versions were available to dealer employees only by subscription, and were specific to a region and updated periodically. The "Blue"versions doe the same value calculations that KBB and CarFax use today, while the "Black" versions reported actual dealer buy/sell data.

Again, these are all pricing guides, not hard facts. Market conditions, the individual sales performance and guidelines at the dealer, and subjective determination of the condition and saleability of on individual vehicle come into play. A dealer that has 3 new and 2 used White JKU Rubi's on the lot isn't going to see a lot of potential in one more, especially if everyone is asking for Black. Also, trade-in margins are even more important than new sales margins, to make up for purchase-price discounts. The RIGHT way to negotiate is to treat each transaction separately and negotiate your best terms individually. Don't even talk about a trade until you've met your goals for your purchase price. Then negotiate the best trade-in value as if its a stand-alone deal.

sounds like the ideal candidate for the lemon law, especially since this visit has lasted more than 31 days. Good luck.
At this point the repair has been completed and the customer accept the vehicle back. But if this or another major problem comes up in the future, a case could be made.
 
#6 · (Edited)
I believe I have the same problem, had the mil light come on, it's in the dealer now for a tranny replacement and they said it just needed that update but I don't think that'll fix it. We'll see when I get it back in a couple of weeks. Yea I also got that same line about how great the resale is.
 
#7 ·
I believe I have the same problem, had the mil light come on, it's in the dealer now for a tray replacement and they said it just needed that update but I don't think that'll fix it. We'll see when I get it back in a couple of weeks. Yea I also got that same line about how great the resale is.
Instead of calling us themselves; the dealer had the rental car company call us yesterday and inform us the dealer would have the Jeep for another week...

While it is nice that Chrysler is paying for the rental, we're sucking up $17 per day in rental car insurance (A Steak Dinner at Outback Everynight) just to make sure the rental car company can't claim we did anything to their rental as far as damage. Not that it's bankrupting us to pay this extra money, but it's definitely in the pissing me off even more category.
 
#8 ·
Amatore;1079580 While it is nice that Chrysler is paying for the rental said:
Yea that would bring the suck if that happens to me.
 
#11 ·
We're already using our regular auto policy to cover the rental but you wouldn't believe the crap the rental car companies have came up with to screw you.

I can't remember it all off-hand, but they were hitting us with stuff such as: "You'll be billed for the lost time the company is unable to rent the rental car while it's being repaired etc."

Also, keep in mind your deductible. We've got a $500 deductible, so if some jerk puts a large door dent or keys the rental car, then we might get snagged in that scenario.

We just don't need the headaches.

Feel free to get one reading all this garbage...

https://enterprise.custhelp.com/app/answers/list/kw/insurance/sno/1/search/1/session/L3RpbWUvMTMzMDMxNTk1MS9zaWQvQm1OSTNKUms%3D
 
#12 ·
Update: Engine Repairs Completed

We picked up the Rubicon today from the Jeep dealer. I'll pass on some highlights of the repairs and summaries of the conversations with the mechanic.

According to the mechanic, who really went out of his way to explain what was done to the vehicle, he stated that the number 4 cylinder only had 55% of it's compression and the number 6 cylinder only had 85%. He went on to state that Chrysler won't repair anything that isn't over a 15% loss in compression.

Other notable highlights of the coversation were he stated that TSB's are not performed on any vehicle unless the customer specifically asks for them to be performed or a problem described by a TSB has occurred.

Apparently Chrysler has to pay for any work performed by a dealer and a TSB isn't mandatory work, so they don't get done unless they fit the above criteria.

The mechanic also stated a TSB isn't a recall and there's some sort of repair category service bulletin that falls between a TSB and a recall. I can't remember the name he used for that bulletin/repair, but he said it would be performed if you brought a vehicle in for any reason. I likened that description to an unofficial recall that that Chrysler didn't want on the 6 o'clock news and he didn't disagree with me about that description.

So far we only brought the vehicle back to the hotel and I've looked it over and things look good so far in regards to leaks etc. The mechanic said taking off a cylinder head is extensive and requires removal of the timing chain cover, oil pan. It also requires discharging the AC unit and of course emptying the coolant system.

Now the crappy part of the story, which involves Enterprise rental. Dropped the rental off at Enterprise, who in turn was supposed to drop us off at the dealer, and got hit with a request to pay a $200 detailing fee to clean the vehicle.

The clown at Enterprise rental stated that because we had put our dog in the rental car, which of course caused dog hair to be in the rental car (a Dodge Journey) we had to pay for detailing to remove the dog hair so the next customer didn't get sick.

I told the guy at Enterprise that Chrysler had called them and informed them that they had out of town customers with a down vehicle that were travelling with a large breed dog when they rented us the car. I further informed him that his employee picked us up at the jeep dealer and drove us back to Enterprise to do the paperwork while the dog was with us. And that his employee had even played with the dog. I then told him that they were negligent in putting us in that type of vehicle if dog hair would trigger a detailing charge and that they should have put us in a pickup or something.

The Enterprise guy choked and agreed to drop the $200 cleaning fee...

Keep that dog thing in mind if you end up renting a car while traveling with a pet.

This will probably be my last post in this topic unless someone has a specific question or comment that needs addressed. Or we have further problems with the engine. Hopefully the information was helpful to some of you.

And if you get the MIL light make sure you flip the ignition switch three times to get the error code so you know what you're really dealing with. Otherwise you'll get the standard retort "that you have bad gas" when in fact your engine is really disintregrating...

Good luck everybody!
 
#13 ·
I've had nothing but problems with Enterprise. Glad that you got your rig back up and running.
 
#16 ·
Thanks, but there's nothing nice about this situation. I just punched in my VIN# on Carfax and it says our Jeep already has 5 entries at Carfax.

Having seen Carfax reports before on a Mercedes we owned, they showed every single thing the dealer had done to it right down to when it got oil changes, A/B services etc.

So we now have a virtually brand new Jeep that's had major engine work which is being reported in Carfax and devaluing the vehicle. The radio repair orders are probably in there as well.

And when I go to trade or sell this thing, they bring up that Carfax report and use it to lowball the value of the vehicle.

Seriously, how corrupt is this whole system getting?
 
#21 · (Edited)
IF that was my post, the VIN I posted was not my car, but a VIN from a local dealership as posted on their website. Out of curiosity, I checked several VINs from that same dealership and carfax reported from 0 to 3 on each of the VINs I cut and pasted. Curious... all from new cars on the lot.

Paul

ps if it makes you feel better, I have rental ins coverage with my regular policy, but had a vibe and bought the extra ins for 17/day. On the third day, I totaled a brand new rental car. Best 17/day I have ever spent. Jeep Liberty gave it's life for mine and my passenger. Yay body on frame cars.
 
#18 ·
There's an old saying that you should "never buy the first model year of a vehicle" and honestly this probably should be the first two model years. It takes a while for a manufacturer to work the bugs out, and unfortunately WE become the guinea pigs. This is one reason why I don't mind my 3.8L. It's slow as a snail pulling a bucket of rocks.. but it's rock solid dependable and probably will be for 300K.

I am happy that you at least got good service from the dealership and they tried to explain everything to you rather than keeping you in the dark. That at least makes you feel a little better about the situation.
 
#19 · (Edited)
Actually, we didn't get good service from the dealership, and I overlooked their first major indiscretion of telling us we had bad fuel rather than a bad cylinder head and tried being nice to them despite that. Remember, they reset the computer and sent us on our way claiming the vehicle was fixed and an hour later we were back with the MIL light on again for the same thing. At which point they insisted it was bad fuel and only after I argued with them that a bad cylinder code doesn't equal bad fuel in my book did they do the testing I initially requested. And at that point they discovered two bad cylinders in the head.

In reality I think their overboard dose of "niceness" when we picked up the vehicle was really an attempt to get us to give them a decent service survey when it gets sent to us in the mail or we get called to rate them.

After the visit yesterday with the radio; they're not gonna like their survey...
 
#20 ·
Great info....I hope I never have to use it! but what you have been through is a very sad thing to say the least. I wish you the best, and it's a shame the dealers / jeep even pulls this shit on there own customers that bought from them!

From what I have read in this post....this is what I am saving from it. If I have a problem....get a scanner or a friends help before going to a dealer. If it is a major issue. Don't say Shit to the dealer and trade it in on a new one. I know they will check everything, but you never know right? It's just a thought:th_pray:
 
#22 ·
just sharing my experience...

yesterday morning I get in the Jeep and she starts ok but us running very rough and the engine light comes on. I drive a short way down the street and can barely get over 15mph as the engine was bogging down and wanted to stall. I turned around and parked it. My friend brought over his scanner and got the same P0304 code...misfire in cylinder 4. I read through your thread and got a little nervous but searched in JKO and elsewhere for potential causes. I picked up one spark plug from Advance and started troubleshooting. First I disconnected and reconnected the ignition wire and no improvement. I pulled out the #4 plug and found the electrode was about half the length as compared to the new one and the gap was significantly wider than the .050 spec in the owners manual for the 3.8L. I gapped the new plug, installed it and the motor started fine and was running nice and smooth. I cleared the code, went for a ride and she is back to normal.

I will be picking up 5 more plugs and change them this weekend.
 
#23 ·
So the dealer called me today after 2.weeks and said my Jk was ready (went in to get the tranny replaced and the mil light looked at, P0304 & P0300). I asked if they test drove it and of course they did. Looking over the invoice they just did the "ECU flash". They pull it around, I jump in and the idle is still rough, I get out track down the "service consultant" and she gets a tech to take a look at it. He brings it back after hooking it to their scanner and can't find anything wrong, so off I go knowing it is not right. I go back to the shop for about an hour get in to leave make it out of the parking lot into the street and Bing on comes the mil light (P0300). So back to the dealer, service was still open but the techs were gone left it there and we'll see what happens. I told them what I wanted checked out we'll see if they get it this time. BTW the build date was Sept.
 
#26 · (Edited)
"i was refering to your very thorough explanation of what you have had to deal with. it makes it easier for other owners following behind you that may encounter the same trouble."

My apologies if you took that as me directing that at you personally as that wasn't the case.

"i also committed the "first year sin", buying my JK 2-17-07. build date 1-23-07. One day after the cutoff for the stall-bug... which my JK suffered from. i took mine back 9 times in the first year. since then? no major problems other than the standard cracked manifold which i replaced with headers. i've been there."

I'm kind of on the fence about the first year thing. Sometimes it happens, sometimes it doesn't. We bought our kid a Mercedes C300 when they first came out, AWD to boot, and it hasn't had a single problem. That car is several years old now.

It must be love because I think nine times would have triggered the lemon law twice over.

Standard cracked manifold? I'm not up on the Jeeps historic problems, this being our first Wrangler, but good news: that manifold is now part of the cylinder head, so ever greater things will be coming your way if it cracks in a vehicle with the Pentastar.


"kinda did it again, as our '11 Journey is a first year redesign (interior/drivetrain). no regrets yet with almost 7,000 miles on it. still. even with some trouble, i wouldn't hesitate to jump into a new JK. i've got a good dealer up the road."

The Journey supposedly has an excellent safety rating, but I don't care for the transmission. That's what was given to us as a rental by the way. When you switch it from park to drive or reverse it makes an obnoxious clunking noise.

We told the Enterprise guy we thought something might be wrong with the transmission and he responded "everyone says that about my Dodge products."


"as for the carfax thing... thats going a little far IMHO. just keep the service record if/when trade or sale comes up. should be easy to explain... although you shouldn't have to."

The Carfax thing is pissing me off. It's one more example of erosion of privacy. I don't think it's anybody's business when you get your vehicle serviced, oil change etc.

I'm very curious if I have signed something that allows my private information to be turned over to Carfax. Are they turning it over for free or selling it?

I only care for it to the extent of total loss vehicles, which should be tracked. But that tracking should be done by the states on a computer system linked together to all of them.

Notice how they have a dealer version of Carfax and a Consumer version. Kelley Blue Book works that way and somehow the dealer ended up with a black book that has much lower values.

While I don't have anything to hide (criminally) I think our founding Father's would be disturbed how our privacy is being eroded. Take for example last week when they announced the cops can search your cell phone without a warrant.

Guess what?

I took my cell phone back last week, paid the early termination, and told them to go @#@$ themselves...
 
#27 ·
So I finally get the call from the dealer late this afternoon and lo and behold it had a burnt valve. They have a replacement head on the way should be here tomorrow, hopefully I'll get it back by the end of the week. So now that my carfax will suck I guess it's time to mod the crap out of this thing and keep it till I die. I think I found the silver lining in this whole mess.:)
 
#28 ·
Just for giggles ask them when they're done how many hours of labor it takes to do the head?

The mechanic I had said it was 20 hours of labor.

On the bright side, we've picked up an average of 2 mpg improvement since the engine is now running on six cylinders instead of four...
 
#29 ·
Update so its been a week and still not done yet, dealer called me Friday and stated that when the head came the gasket had been damaged so they had to get another. So yesterday they called and it had came in so no call today so we'll see tomorrow. It's only been in their shop for a month now. Starting to feel like I should have went a different route.:flipoff:
 
#31 ·
Update so its been a week and still not done yet, dealer called me Friday and stated that when the head came the gasket had been damaged so they had to get another. So yesterday they called and it had came in so no call today so we'll see tomorrow. It's only been in their shop for a month now. Starting to feel like I should have went a different route.:flipoff:
< whispers... "LEMON LAW!"
 
#32 ·
So I called the dealer this afternoon and maybe done tomorrow. Today was day 29 of having it at the dealer.
 
#34 ·
They gave me a C200. Yes you see a lot of Subies around the mountain areas. So I went to the dealer after work to see what's up since they said it was going to be done today. Now comes the best part, the service advisor asked if someone had called me which no one had and then said that they had it running and while it was warming up it started making noises and when the tech checked it out the can phasor had spun and was damaged. They are on back order and she had NO idea when it would became advailible. So the jeep has been in their shop since the 21st of Feb.(this was day 31) and she said the service manager wasn't in and would I like to be called tomorrow (duh). I said that I wanted a new engine then to fix this since they didn't know when I'd get it back and of course she couldn't make that decision on her own.:flipoff:
So I'll make a trip back there tomorrow to start my complaining to the managers and now I think I need to get chrysler/jeep involved. I only had this PoS since Oct24, between this, the trans they had to replace and the leaky top/door seal that I took care of, this has been a real disappointment compared to the 2 Xj's one of which my kid still has (just hit the 180k mileage mark). Should have kept my WK and built that up.
 
#38 ·
My dealer did a flash that was specifically for the P0304 error. At first I thought, it probably just tells the engine to ignore the error. I asked them how it was going to address the ticking, but of course it doesn't so they cant' tell me. None the less, it's already thrown the code 3 times since Friday. Since the dealership was open yesterday, I popped into the service dept and talked to the Service advisor. He gave me the line about just following Jeeps procedures and I told him he was a f'cking moron to his face. That stopped him in his tracks. Sent an email to a local TV affiliate about Jeep not doing anything to address a problem that probably affects 25-50% of the 2012 Wranglers - thats based on the number of JK's on the lot that sounded like mine at my dealership. I've already opened a case with Jeep and got a call yesterday that my case manager would be contacting me tomorrow morning. It sucks that you have to be an ahole to get anything done anymore...
 
#39 ·
Good for you. In a way I kind of feel sorry for the shop folks because these engine problems are way over their heads and their just towing the party line in their responses.

But on the other hand; they obviously don't have any balls to tell Chrysler what is really going on, and as franchises, they should flex those muscles.

But on the other hand again, after watching Myrtle Beach Jeep tell a crying old couple that their serpentine belt (that they installed) kept falling off "because of moisture," then I've seen and heard enough to be fed up with the crap from dealerships.