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Old 10-03-2013, 09:33 PM
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2014 GC Summit code P0302 Cyl Missfire

Hey Guys,

Hopefully you may be able to help me out with this. I have a 2014 Grand Cherokee Summit with a 3.6l V6 engine that has 2,495 miles on it. I purchased it in May.

About a day ago the check engine/MIL light came on while I was stuck in a traffic jam. I live pretty close to work so most of my driving is in stop & go situations.

About two weeks ago I went to the dealership to get the GC flashed with the latest transmission and ECM versions since the Jeep was shifting in a rough manner. Needless to say, they performed the flashes yet I continue to experience rough shifting at lower speeds (in sport mode and regular mode both with & w/o ECO mode).

I'm not sure if the aforementioned had anything to do with it but just wanted to mention it in case it helps. Point is, I ran an OBC code scan and found two codes. Both of them were P0302 which indicates a misfire on the #2 cylinder. I've read several threads mentioning that this is pretty common on the 2012 MY WK2. In some cases engine head replacements were the only solution.

Being that I have yet to find information regarding this issue in 2014MY Grand Cherokees, I would very much appreciate your input regarding the subject. Should I erase the codes and see if they come back? Or should I take it to the dealership and have them figure it out? Given that the solution seems to be a head replacement which, as others have mentioned, may take anywhere from 2 to 7, I'd also like to know if it would be ok to get through the weekend and turn the car in on monday.

I very much appreciate your help with this issue and will keep you posted regarding any updates.

Thanks,
MM
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Old 10-03-2013, 11:48 PM
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Re: 2014 GC Summit code P0302 Cyl Missfire

Shouldn't be a problem to take it in on Monday but do take it in and have them document the codes and diagnose the problem.. It may not be a head problem at all.
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Old 10-04-2013, 02:23 PM
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Re: 2014 GC Summit code P0302 Cyl Missfire

So I ended up taking the Jeep to the dealer this morning. Just got a call from them telling me they had run the tests and that nothing showed up. Moreover, the tech mentioned in his report that the Check Engine Light was off when he turned on the vehicle. They will apparently give me a copy of the scan report when I go pick it up in about an hour.

What's crazy is that I not only found one but two P0302 codes when I did the OBD2 scan. I made sure not to erase them so that they could read them at the dealership. Also, I am completely certain that the Check Engine Light was on when I turned the Jeep in.

This sounds somewhat strange but I guess that with their advanced equipment they should have been able to spot a misfiring #2 cylinder. Nonetheless, since the service rep that took in the vehicle only wrote down "customer indicates CEL is on" instead of also including the fact that the customer mentioned a P0302 code, the technician most probably didn't even care to look into a live read of the motor in search of the misfires. I'll just wait until I get the report and make sure they write down on the "closing documents" that I pointed out the codes in hopes that if anything ever happens I can hold it against them.
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Old 10-04-2013, 02:47 PM
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Re: 2014 GC Summit code P0302 Cyl Missfire

Quote:
Originally Posted by mmoreda View Post
So I ended up taking the Jeep to the dealer this morning. Just got a call from them telling me they had run the tests and that nothing showed up. Moreover, the tech mentioned in his report that the Check Engine Light was off when he turned on the vehicle. They will apparently give me a copy of the scan report when I go pick it up in about an hour.

What's crazy is that I not only found one but two P0302 codes when I did the OBD2 scan. I made sure not to erase them so that they could read them at the dealership. Also, I am completely certain that the Check Engine Light was on when I turned the Jeep in.

This sounds somewhat strange but I guess that with their advanced equipment they should have been able to spot a misfiring #2 cylinder. Nonetheless, since the service rep that took in the vehicle only wrote down "customer indicates CEL is on" instead of also including the fact that the customer mentioned a P0302 code, the technician most probably didn't even care to look into a live read of the motor in search of the misfires. I'll just wait until I get the report and make sure they write down on the "closing documents" that I pointed out the codes in hopes that if anything ever happens I can hold it against them.
If you didn't erase the codes they would be there and they should be noted by the tech that they were there when they scanned/checked the veh. Make sure that they have the codes found noted on the final report!
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