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After the CEL went on and off for a few months with only P0300 codes and no specific cylinder I decided to keep driving. Finally P0302 showed up, then P0304 and P0306 show as permanent codes in the ECU.
Drove it over to the dealer because I have to smog it and the CEL came on again.
Sure enough, left side head. FINALLY at 101K miles I was hoping it would pop so it would be covered!
Sure enough, it's covered, all heads on backorder forever.
BUT
They happened to have one at their location that didn't get installed on a customer's car, exact one I need. Hope to have it back shortly.

Hope its smooth sailing from here.
 

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I would ask for a loaner car. If it lets loose you could be stranded in the middle of no where. .
I did ask the dealer, but they said they were too small and can't provide a loaner. I'm going to drive it and hope for the best. In the meantime I am working with FCA who are trying to expedite a new head. We'll see...
 

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After the CEL went on and off for a few months with only P0300 codes and no specific cylinder I decided to keep driving. Finally P0302 showed up, then P0304 and P0306 show as permanent codes in the ECU.
Drove it over to the dealer because I have to smog it and the CEL came on again.
Sure enough, left side head. FINALLY at 101K miles I was hoping it would pop so it would be covered!
Sure enough, it's covered, all heads on backorder forever.
BUT
They happened to have one at their location that didn't get installed on a customer's car, exact one I need. Hope to have it back shortly.

Hope its smooth sailing from here.
AAAAAAND, thanks Chrysler, another fail. I got the NEW head installed and the mechanic takes it on a test drive to find out the NEW HEAD IS BAD.
Now they have to get Mopar warranty involved to hopefully expedite a replacement. I'm in the same boar as most now, waiting with no vehicle. I'm trying to see if they'll give me a loaner/rental while I'm out a vahicle.
:atomic:
 

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Update:
I really changed my mind about the local dealership (I've had issues with in the past.) I got to work with two great guys there who really worked hard to get this right.
They found another head on the shelf at a local dealership, when I was called they thought it might be another 2 days to get my Jeep back but LATER that DAY the tech had it finished!
Got her back and I'm hoping this is the last I'll be dealing with it.
 

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I brought my 17 JKU w/33K in to the dealer today with a P0306 code. They will be replacing the cylinder head, but they are on back order nationally and the wait is months. I called 1800Chrysler to expedite, but not sure how much that helps.

I’ll keep driving it unless something seems way off.
Here is the latest update. The new left head came in Tuesday and I dropped it off Wednesday. They did the replacement and broke down on the highway, having to have it towed back. After more work they see issues with the right head and can’t get it running. They showed me a ring/washer about the diameter of a dime that had failed, and noticed rocker wear.

So, they have ordered a full long block that will have two new heads and I’m not sure what else. Really sucks since the hardtop was coming off for the summer and I use my Jeep for light towing. It’s my daily driver and I like having my vehicle. I do have a Cherokee loaner, but need to work with them to find something with a hitch.

Finally, I have no dates given this all transpired yesterday. I love my Jeep and the service manager and techs have done a good job.
 

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AAAAAAND, thanks Chrysler, another fail. I got the NEW head installed and the mechanic takes it on a test drive to find out the NEW HEAD IS BAD.
Now they have to get Mopar warranty involved to hopefully expedite a replacement. I'm in the same boar as most now, waiting with no vehicle. I'm trying to see if they'll give me a loaner/rental while I'm out a vahicle.
:atomic:
Having worked in 5 different dealerships over the years, and seeing all kinds of screw ups, it makes me wonder if the techs aren't screwing up the job making the failure rate a lot higher than it really is. Don't get me wrong, not all techs are bad, but the % of bad to good leaves me scratching my head. Reading on several message boards about things like simple oil changes getting messed up reinforces this.
 

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Having worked in 5 different dealerships over the years, and seeing all kinds of screw ups, it makes me wonder if the techs aren't screwing up the job making the failure rate a lot higher than it really is. Don't get me wrong, not all techs are bad, but the % of bad to good leaves me scratching my head. Reading on several message boards about things like simple oil changes getting messed up reinforces this.
I totally agree. I’ve had many different vehicles with the last 8 years being jeeps. Jeep/Chrysler Mechanics and dealerships are some of the worst I’ve ever seen. the Dealerships don’t seem to care because the money to be made is from repairs and not vehicle sales. And is pretty funny that you mentioned simple oil changes getting messed up. I’ve read several times that it’s common for Jeep/Chrysler dealers to forget to add new oil after doing a change 😱
 

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I totally agree. I’ve had many different vehicles with the last 8 years being jeeps. Jeep/Chrysler Mechanics and dealerships are some of the worst I’ve ever seen. the Dealerships don’t seem to care because the money to be made is from repairs and not vehicle sales. And is pretty funny that you mentioned simple oil changes getting messed up. I’ve read several times that it’s common for Jeep/Chrysler dealers to forget to add new oil after doing a change 😱
Oil changes, simple enough for most, one would think. Forget about grossly over-filled, under-filled, stripped oil pan thread, filters put on so tight you have to resort to gigantic pliers, stabbing holes through them, chiseling them off etc. Or now with these cartridge filter housings being a weak link I wonder how many are destroyed by grossly over-tightening the filter cap? I bet quite a few. I avoid dealers as much as humanly possible. The work quality is often pathetic. The thought of them ripping into an engine or transmission is frightening. Having said that there are good techs, finding one can often be a daunting task!
 
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Isnt a "short block "a better option, what will happen if to....disregard those codes and keep driving until engine gets more damage?
Lets say head goes at 45K, than at 60K+ potentially oil filter housing is near the end and at 80K +eventually rocker arms, i would prefer a new engine before my warranty is gone :)
 

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Isnt a "short block "a better option, what will happen if to....disregard those codes and keep driving until engine gets more damage?
Lets say head goes at 45K, than at 60K+ potentially oil filter housing is near the end and at 80K +eventually rocker arms, i would prefer a new engine before my warranty is gone :)
I kept driving as the codes were intermittent. By the time the code was basically on all the time (and then it'd be off for two weeks then on for a month) I had to renew tags and smog, so I had to go. Bad head, as I stated before.

Last week engine light came back on, random misfire, I took it in as I suspected a fail due to previous work. I hope they were truthful in telling me it was pass side coils. Funny thing was they really wanted to me to do all coils and plugs due to mileage (despite new factory plugs put in by me 6 months ago) but I had them do the minimum of three coils. I figured I already had it there (minimum $160 fee) and it should be a quick fix (150 parts). Boy was I wrong. A week later I finally got it back. $436 for three coils on the PASS side. I could do that in 30 minutes! One way or another they'll get your money.
I'll never be back.
 

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I too have concerns about the quality of work that will be done, but at the same time have to trust they will do it right. We’ll see - need the parts first.
 

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Oil changes, simple enough for most, one would think. Forget about grossly over-filled, under-filled, stripped oil pan thread, filters put on so tight you have to resort to gigantic pliers, stabbing holes through them, chiseling them off etc. Or now with these cartridge filter housings being a weak link I wonder how many are destroyed by grossly over-tightening the filter cap? I bet quite a few. I avoid dealers as much as humanly possible. The work quality is often pathetic. The thought of them ripping into an engine or transmission is frightening. Having said that there are good techs, finding one can often be a daunting task!
Yep. Changing out a head, especially on these engines, is a complex task with many things that must be done exactly right ( ...or can be done wrong.) It is not something to do against the clock but of course it usually is. This is why it is very important that a misfire problem be diagnosed correctly with a compression check to determine with certainty that the head or valves have really failed and the problem is not just a bad rocker or collapsed lifter (especially on 2014 and later vehicles with the updated heads.). You do not want something invasive as a head replacement being performed unless it is truly necessary.
 

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Someone needs to SUE Chrysler for this issue. I am in the process of fixing a lawyer and just have my engine replaced at this point.
 

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Well, I finally got my Jeep back yesterday after the long block replacement. I was patient and worked closely with the service manager at my local dealership. Although the block came in last Tuesday, they didn’t start the repair until this Monday. It was done late Tuesday, but the service manager was off Wednesday and wanted to check and clean my Jeep. I was fine with this after almost three weeks of no Jeep.

I did what I think was a good inspection and couldn’t see any issues with the work. It drove as normal, and late yesterday I pulled my utility trailer 80 miles (Highway) in wet conditions with no issue. Engine temp was 206-208, tranny ~165, and oil pressure ~44 - all consistent. No leaks, so we’ll see.

I’m at 35K, with 3 years ownership this August. The drivetrain warranty was extended for 3 years/100K - whatever comes first. I’m hopeful my issues are resolved.

Here is the work order.
35421410-3236-44C3-A4FF-EC19B3BD0933.jpeg
 
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Hi all -

I have had my 2015 JKU in the dealership before for a P0306 that resulted in a "Couldnt find anything" from the service department. I have approximately 53,000 miles on it at this time, around 50,000 when that engine code popped.

The code (P0306) came on when I was driving through the mountains outside of Keystone, CO. It has happened before in similar driving conditions, when you would get a big downshift to maintain speed up a hill.

It stayed on for a month until I was able to take it to my local jeep dealer. They charged a $100 diagnostic fee and told me that they were not able to locate any problems. I am concerned that this intermittent problem will continue to happen until an actual significant issue develops, but likely will be out of warranty. Does anyone have a good link to anything that would be helpful for reference when working with the service department? I believe this will be similar to my radiator leak that somehow was only a warranty item if I purchased a rear brake job from that dealer.

When discussing this P0306 with the local service ticket writer, I told him that I at least was glad that I brought a potential warranty issue in to their attention so that I could have a logged record of discussing the problem while it was still under warranty, thus preserving my warranty. He didnt seem to agree that this was a likely scenario.
 

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Look at the coil connector, I had to repair mine because the wire got brittle and broke off in my hand. I had to repair it and by a buy a pig tail off of ebay because it isn't available from the dealer...
 

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Hi all -

I have had my 2015 JKU in the dealership before for a P0306 that resulted in a "Couldnt find anything" from the service department. I have approximately 53,000 miles on it at this time, around 50,000 when that engine code popped.

The code (P0306) came on when I was driving through the mountains outside of Keystone, CO. It has happened before in similar driving conditions, when you would get a big downshift to maintain speed up a hill.

It stayed on for a month until I was able to take it to my local jeep dealer. They charged a $100 diagnostic fee and told me that they were not able to locate any problems. I am concerned that this intermittent problem will continue to happen until an actual significant issue develops, but likely will be out of warranty. Does anyone have a good link to anything that would be helpful for reference when working with the service department? I believe this will be similar to my radiator leak that somehow was only a warranty item if I purchased a rear brake job from that dealer.

When discussing this P0306 with the local service ticket writer, I told him that I at least was glad that I brought a potential warranty issue in to their attention so that I could have a logged record of discussing the problem while it was still under warranty, thus preserving my warranty. He didnt seem to agree that this was a likely scenario.
im from Florida and did a long trip out west last year. I was going up hills in Texas and had that code set for the first time. It went on again climbing hills in New Mexico, so I took it in to a Jeep dealer in Albuquerque. They had it fixed in 45 minutes. They said I just needed an updated flash on the computer. They didn’t charge me a dime and it never has happened since. Your experience sounds very similar.
 

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P0306 is cyl 6 misfire.
its the hader to get to coil. Suprised they didnt replace coil.
Then again not surprised because you might be back later to replace it.
The procedure seems to be: 1 clear the code, see if it comes back, 2 flash the ecu, 3 replace the coil.
Three visits
P0300 random multiple misfire is the more conscerning/annoying one
 
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