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2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing.


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Novice

Nov 7, 2016, 9:46 PM

Post #1 of 11 (324 views)
2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

I am having issues with my 2009 GMC Sierra. It has around 330,000 kms.

- Service stabilitrak pops up constantly and sometimes says stabilitrak is now off.

- 3 cylinders are not firing

- Engine lights keeps blinking

Is there something simple that could be causing these problems like a bad fuel pump? Spark plugs? Or is it time to find a new truck?

I replaced spark plugs not to long ago so id think those should be good?

Any comments would be helpful.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 8, 2016, 3:03 AM

Post #2 of 11 (307 views)
Re: 2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

Check engine light blinking means NOW! Get code readings at once and post the #s not another person's idea of what to replace.


Blinking means you are actively harming this vehicle by continuing to run it.


BTW - about all vehicles will do best with original brand and type of spark plugs. Any changes in brand or type frequently can be the new problem added to what you were trying to fix so just know that,


T



Discretesignals
Ultimate Carjunky / Moderator
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Nov 8, 2016, 5:25 AM

Post #3 of 11 (298 views)
Re: 2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

As Tom stated, retrieve trouble codes and post the numbers in here. Which engine? Which three cylinders are missing?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Need Help
Novice

Nov 8, 2016, 7:44 AM

Post #4 of 11 (288 views)
Re: 2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

Thanks for the feedback guys. Not sure if spark plugs were the same brand I will find that out and I will also post codes when I can get them today.


Thanks


Hammer Time
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Nov 8, 2016, 8:21 AM

Post #5 of 11 (283 views)
Re: 2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

With that many miles you probably want to test the compression before going too far.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Need Help
Novice

Nov 8, 2016, 4:27 PM

Post #6 of 11 (268 views)
Re: 2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

These are the codes I found.

- P0305 Cnf Cylinder 5 misfire 1/3
- P0305 Pnd Cylinder 5 misfire 2/3
- P0305 Pro Cylinder 5 misfire 3/3


Need Help
Novice

Nov 8, 2016, 4:35 PM

Post #7 of 11 (266 views)
Re: 2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

Could replacing the coil pack or packs fix these problems?


Discretesignals
Ultimate Carjunky / Moderator
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Nov 8, 2016, 4:39 PM

Post #8 of 11 (264 views)
Re: 2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

According to the codes you only have one cylinder missing. Does this misfire all the time? Which engine? A compression test would be a good thing to do to rule out mechanical issues.

Replacing a coil would be a fix, if the coil is the problem. Does it have spark on that cylinder?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Nov 8, 2016, 4:40 PM)


Need Help
Novice

Nov 8, 2016, 4:45 PM

Post #9 of 11 (259 views)
Re: 2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

Yeah I guess it is only the one. I have had misfire problems for a good year now but they have been rare. Hitting certain rpms used to sometimes trigger a misfire, but as I said earlier whenever the truck is running the engine light is constantly blinking.


Discretesignals
Ultimate Carjunky / Moderator
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Nov 8, 2016, 4:49 PM

Post #10 of 11 (257 views)
Re: 2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

Which engine???? Does it misfire all the time? Is it missing while the engine is idling? Be kind of a waste of money to start replacing stuff that is good.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Need Help
Novice

Nov 8, 2016, 5:08 PM

Post #11 of 11 (255 views)
Re: 2009 GMC Sierra misfires, stabilitrak warning, and 3 cylinders not firing. Sign In

Yes the engine light. It did not misfire all the time no. But the other day, yes it started to have a constant misfire so I stopped driving it. When in idle, it does not misfire, not until you take it out of park.






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