Question about 2003 Hummer H2

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Car loses power

Check engine light flashes on and off and the car loses power when this occurs generally only happens up a long or steep hill or at a higher speed.

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  • Anonymous Dec 15, 2008

    THE HUMMER IS NOT STARTING

  • Anonymous Mar 29, 2014

    The dealer cannot reproduce my experience with the car, but are holding it to try and figure it out.

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  • 31 Answers

When the check engine light is flashing that indicates an engine misfire, which is catalyst damaging. Because you said that it generally only happens up a long hill or at higher speed, and it doesnt happen all of the time, most likely you are in need of a full tune up.

Posted on Dec 11, 2008

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