P0307 Misfire - 5.0L

Nick1994 · Mar 10, 2020

Hello, went out to start my 15' Genesis 5.0L and got a flashing check engine light. Engine sounded a little weird but not too bad. I turned it off and borrowed a scan tool, P0307 misfire code.
thinking it might just be a coil, but wanted to see if this is a common problem and maybe it's something else.

Thanks for the input!

Markymark · Mar 10, 2020

Nick1994 said:
Hello, went out to start my 15' Genesis 5.0L and got a flashing check engine light. Engine sounded a little weird but not too bad. I turned it off and borrowed a scan tool, P0307 misfire code.
thinking it might just be a coil, but wanted to see if this is a common problem and maybe it's something else.

Thanks for the input!

Exact same thing has happened to me. I started it up and the engine sounded wonky. The CEL was flashing too. I shut it off and restarted and everything was fine.

I just put in some techron & another fuel additive and used high octane. Nothing since then. If you get it diagnosed I would like to hear what the root cause was.

cRaCkZzZz · Mar 11, 2020

Nick1994 said:
Hello, went out to start my 15' Genesis 5.0L and got a flashing check engine light. Engine sounded a little weird but not too bad. I turned it off and borrowed a scan tool, P0307 misfire code.
thinking it might just be a coil, but wanted to see if this is a common problem and maybe it's something else.

Thanks for the input!

Hello, I had the same issue recently and the dealer diagnosed the misfire. They said that it's probably a bad coil. They will replace the coil if this error will pop up again.