Question about 2005 Hummer H2

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I'm getting a p003 engine code , what does this mean and how can I fix this

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  • Hummer Master
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OBDII trouble codes are the letter P followed by four digits. Are you sure it's P003?

Posted on Dec 30, 2012

  • 3 more comments 
  • Harold Washington
    Harold Washington Dec 30, 2012

    my mistake it says P0303

  • Jeremy W.
    Jeremy W. Dec 30, 2012

    That would be a number 3 cylinder misfire. What engine do you have?

  • Harold Washington
    Harold Washington Dec 30, 2012

    its a vortec v8 6.0 liter

  • Jeremy W.
    Jeremy W. Dec 30, 2012

    Great! Cylinder number three should be the second one back on the passenger side. Each cylinder has a coil and a plug wire. You can start by checking for spark out of the plug wire. If there is no spark than a new coil and wire should fix the problem. You can also check the spark plug to see what condition it is in. Also look for carbon tracking on the plug. It will look like a black line on the white part of the plug. If nothing seems wrong with the before mentioned than try swapping the coil with another cylinder. If the misfire follows the coil than replace it. You can also do this with the plu and the wire. If there is no change with swapping than you may have an injector issue or possible a weak cylinder. A compression test will tell you if the cylinder is o.k. Hope that helps. Let me know what you figure out.

  • Harold Washington
    Harold Washington Dec 30, 2012

    thanks , I will give it a try

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