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Code P0301

Tiny
MARK87
  • MEMBER
  • 2014 CHEVROLET CRUZE
  • 1.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 40,000 MILES
My brother came in with an engine check light on, engine was misfiring at idle, put the scanner on got a code "P0301 cylinder 1 misfiring". Swapped the spark plugs from cylinder 1 and 2 no fix, but found cylinder 1 plug to be a bit wet a small smell of fuel, check the wiring all looks good. Guessing the coil pack is faulty, cannot swap the coil around since it's a pack. Is there a continuity test or resistance check that can be done with a multimeter to confirm the coil pack is faulty? Try to listen for any vacuum leaks didn't hear anything. Should a cylinder 1 compression test be done? Should I be swapping fuel injectors 1 and 2 also?
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Saturday, June 11th, 2022 AT 9:02 AM

6 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
In short, yes, we have testing for this coil module.

I will attach it below, but here are a couple guides that will help with this testing:

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please see the attached testing and wiring diagrams and let us know what you find.

Please let me know what questions you have.

Thanks
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Sunday, June 12th, 2022 AT 9:59 AM
Tiny
MARK87
  • MEMBER
  • 61 POSTS
While troubleshooting for the problem, all of the sudden car won't start at all, not cranking plus I found that the central locking with the key is not working, very strange, central locking from inside button is working but with the key is not locking. Any ideas? My guessing a fuse or relay has gone bad.
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Monday, June 13th, 2022 AT 9:20 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Yes. Clearly a misfire would not cause this or be related (most likely) so we are going to have to get a new post started for a no start issue.

Unfortunately, that is a popular failure and others will not find the solution to that under this post.

Once we figure out the no start issue, we can get back on the misfire.

Clearly a misfire doesn't matter if the engine is not running. :)
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Monday, June 13th, 2022 AT 9:47 AM
Tiny
MARK87
  • MEMBER
  • 61 POSTS
I replaced the ignition coil, the misfire is gone engine running smooth. Can an ignition coil drain a battery?
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Thursday, June 23rd, 2022 AT 3:09 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
That is great that the misfire is gone.

As for the coil draining the battery, it can if it is shorted and causing constant power to flow through it to ground.

Which could cause the locking issue that you were seeing. Basically, when the battery is draining the control modules start load shedding and a lot of functions stop working just to try and save as much current to start the engine or the more important systems.

Great find and thanks for updating us.
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Thursday, June 23rd, 2022 AT 7:26 AM
Tiny
MARK87
  • MEMBER
  • 61 POSTS
Many thanks again for your help.
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Thursday, June 23rd, 2022 AT 9:06 PM

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