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Pontiac
Grand Prix
Engine
Symptoms
Misfire
Engine misfiring, code p300
2008 PONTIAC GRAND PRIX
203,000 MILES • 3.8L • 6 CYL • 2WD • AUTOMATIC
TANNA JOHNSON
MEMBER
1 POST
Yes, had a misfire. one coil pack was not firing replaced it and it's still misfiring scan code p300.
Jul 25, 2021 at 1:18 AM
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ASEMASTER6371
✓
Experienced Mechanic
52,796 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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Jul 25, 2021 at 6:08 AM
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