Code for a #5 misfire today

M

Mdslngr

New member

• Jan 15, 2018

• #1

So on my way to work this happened to my 13JKU

Jeep started running rough and was a bit louder



Just got a call from dealership and they said it was a coil and the PCM

So $852 for them to do just the PCM

Not how I wanted my Monday to go




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DannyD

New member

• Jan 15, 2018

• #2

Check plugs, their not expensive and if that's the issue could save some $$


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kpig

Member

• Jan 15, 2018

• #3

I had a cylinder 1 misfire (passenger side) on my 2015 JKU. The dealership did the repair under warranty and only replaced the cylinder 1 coil pack, plug, and plug wire. There was no need to replace the PCM, but your model year could differ slightly or require a PCM update. I would think PCM would have to be changed if you were getting the P0300 for multiple cylinder misfire. Good luck.

 

Snboarder113

Hooked

• Jan 15, 2018

• #4

Coil AND the pcm? Ya I’m not buyin that one.


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WJCO

Meme King

• Jan 15, 2018

• #5

This issue is very common on Fords and Lincolns where the coil shorting out damages the PCM, but this is the first I've heard about it on a Jeep.

 

M

Mdslngr

New member

• Jan 16, 2018

• #6

I went to the dealership and had the mechanic show me what he was talking about.
So the PCM was sending a constant single to coil 5. The coil got so hot it cracked down the middle

He swapped #5 with a good coil and still misfired at #5 so after a few more tests he determined the PCM bad




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Snboarder113

Hooked

• Jan 16, 2018

• #7

thats a bad day.

 

kpig

Member

• Jan 16, 2018

• #8

Mdslngr said:

I went to the dealership and had the mechanic show me what he was talking about.
So the PCM was sending a constant single to coil 5. The coil got so hot it cracked down the middle

He swapped #5 with a good coil and still misfired at #5 so after a few more tests he determined the PCM bad




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Click to expand...

Well that’s pretty definitive proof. Sorry for the bad luck. Hopefully no more problems so you can get back on the trails.

 

Good2Go

Member

• Jan 16, 2018

• #9

For what it’s worth, my ‘16 JKU had a service bulletin (not a recall) for a PCM flash related to false misfire codes showing up. Hopefully they checked for any needed upgrades when you brought it in.


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