Cracked ignition coil - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 5 Old 02-16-2016, 07:29 AM Thread Starter
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Location: Oshawa, Ontario, Canada, Earth
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Cracked ignition coil

Hey guys,

My 2008 jk started running very rough, it threw a few check engine codes including P0300 (multiple/random cylinder misfire) and P2305 (ignition coil B secondary circuit). I took a look at my 6 month old ignition pack and it had a deep crack all the way across it. I replaced it this morning and its still running rough, and im still getting those same 2 codes... ive cleared the codes and they just come right back. My plugs and wires are 6 months old. I was sure the cracked coil would have fixed this... Is it possible that it fried my PCM?

Any help would be much appreciated. I need to sort this out so i can drive to work.

2008 Unlimited Rubicon
Jeep Green
6-Speed

AEV 3.5" SC Lift
Smittybilt XRC front bumper
5x 35x12.50R17 MT/R's with kevlar.
17" Procomp series 98.
PIAA 510 35W fogs
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post #2 of 5 Old 02-16-2016, 08:48 AM
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What plugs did you install? Did you go with something exotic like Bosch Platinum +4 or something?
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post #3 of 5 Old 02-16-2016, 09:33 AM Thread Starter
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I believe they were the same as stock, ngk platinums, and mopar wires. I had a cylinder 6 misfire 6 months ago, changed wires and plugs and then the coil finally solved that.... The coil i put in now has a deep crack starting from the left going right on an anle between where the wires for 2 and 5 are... so i figured that was it but with the new coil i have the same issue.

Ill pick up plugs and wires again and see if that changes anything.

Is the p2305 code on the jk specific to cylinder 2?

Thanks!
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post #4 of 5 Old 02-16-2016, 10:05 AM
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what coil did you install? After market or factory? I know we had customers putting some after market coils on BMWs and they did not fix issues they were having. We would put bosch units on and clear the issues right up.
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post #5 of 5 Old 02-16-2016, 02:46 PM Thread Starter
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It was an aftermarket coil, i cant remember the brand, suposed to be decent... I ended up moving plugs and wires around to see if the fault would follow but no luck. Took it to a local dealer and i have no power going to coil 2 from the pcm. Theyre changing the PCM tomorrow... $850. Hopefully thats all it is...
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