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Discussion Starter #1
I have a 2009 traverse. Car was misfiring so changed out all 6 coils and plugs. Started car check engine light on checked with reader and showing misfire codes on all 6 cylinders. Problem is car runs perfect. Major problem is wife is now mad because car starter will not work when your check engine light is on
 

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I have a 2009 traverse. Car was misfiring so changed out all 6 coils and plugs. Started car check engine light on checked with reader and showing misfire codes on all 6 cylinders. Problem is car runs perfect. Major problem is wife is now mad because car starter will not work when your check engine light is on
Can you list the exact codes you're pulling? Also, what are the part numbers you used for the coils and plugs? While doing my research for this job on my 09, I found the 09 has some one year only parts.
 

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yes, remote start will not run if the CEL is on.


get the codes.
Some codes may be set while you worked and disconnected stuff....
and may clear on their own after a few cold engine cycles.


But get the codes so we know whats going on.
 

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Discussion Starter #4
Codes are as follows:
P0351 coil a primary
P0352 coil b primary
P0353 coil c primary
P0354 coil d primary
P0355 coil e primary
P0356 coil f primary

Coils were uf-375 and plugs were autolite app5263. I cleared all codes and if you drive the car they will come right back. Car runs perfectly fine tho.....
 

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Codes are as follows:
P0351 coil a primary
P0352 coil b primary
P0353 coil c primary
P0354 coil d primary
P0355 coil e primary
P0356 coil f primary

Coils were uf-375 and plugs were autolite app5263. I cleared all codes and if you drive the car they will come right back. Car runs perfectly fine tho.....
Code P0351 thru P0356 indicates there's an electrical problem in either the primary (the computer side) or the secondary (the spark plug side) of the Ignition Coil Circuit. Check the wiring into the coils and make sure they are secure. Also check the condition of the harness. Were these codes there before you swapped out the plugs and coils?
 

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The CEL only came on after the parts swap. Same job was done 3 years ago without a issue.
If you had one or two of those codes, I'd say maybe the connectors were damaged when they were removed from the old coils, but a code for all six, something is up. The connectors on the new coil are the same as the old coils, correct?
 

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I'm wondering if the new coils are "talking" correctly to the PCM. Since you have code for all 6, replace one of the 3 in the front of the motor with one of the coils you removed. Then see if you still have a code for each coil, or just 5.
 

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Discussion Starter #9
Yup. I would imagine harness are on correctly because they wouldn’t lock into place without. Only thing I can think is I ordered all 6 from amazon for $70 new. But that’s the same thing I did last time. Maybe it’s not reading the coils correctly but I would think if that’s the case they wouldn’t work right?..... I’m just dumbfounded lol
 

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Yup. I would imagine harness are on correctly because they wouldn’t lock into place without. Only thing I can think is I ordered all 6 from amazon for $70 new. But that’s the same thing I did last time. Maybe it’s not reading the coils correctly but I would think if that’s the case they wouldn’t work right?..... I’m just dumbfounded lol
My guess is you have the wrong or defective coils, that's why I suggested taking one of the old coils (if you still have them) and replacing one of the new ones with it to see if the code returns for that cylinder. If the code doesn't, you have found your issue.

I bought my new coils from Amazon too, but I used the Delco ones. They weren't cheap, but not expensive either, $26 each.
 

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Yup...the front three are easy, just pull the engine cover and you’ll be able to change them.
 
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