2007 Pontiac Grand Prix coil not firing

ANDREWSHEAKLEY33

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

2007 grand prix 3.8L ignition coil pack 2-5 wont fire. I have swap coils all around and all coils fire. Just no coil will fire off 2-5. I checked crank sensor volt at icm. When I turn engine by hand wire H&G have 6 volts. Also checked K for ground. I have a good ground. P has battery volt. N has 11.9 volts. Only code is P0300. Now before all this only this was going on with the car was battery saver mode and charging system failure lights on. But the battery is charging 14.1 volts and tested. Battery new and been tested. Its ok. Any suggestions?

Saturday, February 1st, 2014 AT 2:20 PM

3 Replies

JDL

MECHANIC
16,098 POSTS

Maybe a problem with ignition module?

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Saturday, February 1st, 2014 AT 3:01 PM

ANDREWSHEAKLEY33

MEMBER
4 POSTS

How do u know its not the ecm. Is there a way to test input or output volts. I know its hard to test because all volts are correct. Guess its just a $130 guess

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Saturday, February 1st, 2014 AT 3:35 PM

JDL

MECHANIC
16,098 POSTS

I've been told some national brand autostores can check ignition modules. I don't know if they can check yours?

With bypass ignition, It is the ignition module that controls spark during cranking, not the computer. After the vehicle starts and the rpms reach a certain point, the computer then takes over spark advance.

All I can go by is the info from our database.

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Saturday, February 1st, 2014 AT 4:28 PM