Engine misfiring, code p300

Tiny
TANNA JOHNSON
  • MEMBER
  • 2008 PONTIAC GRAND PRIX
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 203,000 MILES
Yes, had a misfire. One coil pack was not firing replaced it and it's still misfiring scan code p300.
Sunday, July 25th, 2021 AT 8:18 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

You need to change the module that the coil pack is mounted on. That is what commands the coil to fire off.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

When we have this failure, we replace all 3 coils and the module together.

Roy
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Sunday, July 25th, 2021 AT 1:08 PM

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