Coil pack not firing

ANDREWSHEAKLEY34

MEMBER
2007 PONTIAC GRAND PRIX
3.8L
6 CYL
FWD
AUTOMATIC
120,000 MILES

Ignition coil pack 2-5 is not firing. I swap all coils around and all of them fire, Just not the middle one. I checked volt for crank sensor to the icm. At the icm wire P has battery volt. Wires H&G when turning the engine by hand clockwise has 6 volts. Wire N has 11.9 volts. Checked for good ground on wire K. Checked ok. Only code is P0300. Only problem I was having with the car before all this was the charging system failure and battery saver mode was on. New battery and retested ok. Charging system at battery is 14.1 volt. Any suggestion? Note it was slightly bumped in the L front corner.

6 Replies

KNOWLEDGE IS POWER

MECHANIC
1,136 POSTS

It really sounds like you need a new ignition control module. Its the flat thing under the coil packs

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Saturday, February 1st, 2014 AT 3:46 PM

ANDREWSHEAKLEY33

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4 POSTS

I will try that. Thank for your help

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Saturday, February 1st, 2014 AT 3:52 PM

KNOWLEDGE IS POWER

MECHANIC
1,136 POSTS

Youre welcome. Im here if you need more help. Ill answer as soon as I can

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Saturday, February 1st, 2014 AT 4:08 PM

KRAZY4X4S

MEMBER
30 POSTS
2005 PONTIAC GRAND PRIX
6 CYL
FWD
AUTOMATIC
205,000 MILES

I have a 2005 pontiac grand prix 3.8l. With 205k miles ont. If the ignition control module is bad can it cause it to throw emission fault codes? It brings up code. P0420 � Catalyst System Efficiency Below Threshold (Bank 1)
it also has a ignition module code that comes and goes

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Friday, June 14th, 2019 AT 6:06 PM (Merged)

RASMATAZ

MECHANIC
75,992 POSTS

If there's problem with the ICM I don't think it will start and also won't throw an emission code/s

Start checking the oxygen sensor/s and the catalytic converter