Question about 2004 GMC Envoy

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2003 Hummer H2 check engine light is on steady

Reduced Engine Power  & when we increase speed the check engine light begins flashing

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  • ayman_1963_n Jan 27, 2009

    thank for you

  • peabs46 Mar 04, 2009

    03 hummer h2 reduced engine power light and reduced engine power takes place .. shut it off a couple of times and power regains but engine light stays on

  • 427sccobra Apr 13, 2009

    I have the same problem and Autozone read the codes and said it could be one of four issues, plugs and wires (changed and did not fix) ignition coil (next step) , Cam position timing sensor, and fuel pressure regualtor. May question is how many coils does the engine have? It looks like there are 8??? Can anyone answer this question?

  • Anonymous Mar 19, 2014

    Reduced engine power light comes on intermittently

  • Anonymous Apr 01, 2014

    2003 reduce engine power

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This is Obama's new energy policy to to save gas !

Seriously, go to Autozone and they'll read the code for free.

Posted on Jan 27, 2009

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You need to have it scanned for codes

Posted on Jan 27, 2009

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Check engine and service traction control light on in 3rd limp mode


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My hummer H2 2003 did the same and I checked the coolant it was low.Refill the coolant and start the vehicle,if problem of reduced power persists check the thermostat if its not faulty.Hoping this will solve your reduced poweproblem

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Aug 19, 2011 | 2003 Hummer H2

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Mar 08, 2011 | 2003 Hummer H2

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Jan 29, 2011 | 2003 Hummer H2

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If it is OBD2 Then have it scanned, most likely it is something simple as a blown fuse or faulty wiring.

Jan 11, 2010 | 2003 Hummer H2

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sounds like a skip if the light flashes. your vehicle goes into a limp mode if it detects a problem to prevent further damage. this is why you cant go over a certain speed of rpm

Oct 03, 2009 | 2003 Hummer H2

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May 13, 2009 | 2003 Hummer H2

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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.

Dec 11, 2008 | 2003 Hummer H2

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