Question about 2006 GMC Sierra 1500 2WD

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I have a 2006 GMC Sierra 5.3liter/automatic that is giving the p306 code. I have replace the ignition coil on the passenger side that is third from the front of the truck (#6), and the problem persist. The code is not persistent and will cut off on its on. It mainly occurs when the outside temperature is very hot and the truck becomes sluggish and the motor begins to miss severely. On two occasions the engine light has flashed. I have not noticed and rotten egg smell, but I have heard that there could be problems with the catalytic converter. Thanks for the assistance.

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Pull # 5 plug and have a look at it .. because they fire so close to each other it can confuse the pcm about wich cylinder in having a problem. I have seen this between #7 and #8 on a few occasions. As you see the firing order has those two close together. 18736532

Posted on Jul 29, 2010

Testimonial: "would it do this in only hot conditions?"

  • Ron
    Ron Jul 29, 2010

    P0300 is a general misfire code and would be more likely to come up if it was outside temp related , also I see I made an error and put 3 in twice .. It should be 18736542 . That being said , I would still pull the plugs and check to see how they are firing .. A bad plug or coil will show more in hot engine conditions .

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