Question about GMC Sierra 1500

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I have a '06 sierra small block. The code that is showing up is that the engine is running too lean. Cleaned air filter and re-set. Still showing too lean. Any suggestions? Chico Thuon Vail, Colorado

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  • toneman2121
    toneman2121 May 31, 2010

    what is the code?

  • Jonathan S
    Jonathan S May 31, 2010

    This may be an O2 sensor malfunction or a possible vacuum leak. What code is it P0171 P0174 this would indicate which bank is triggering your light to come on.The 171 would be the driverside bank and the 174 would be passenger side. Are these the only codes or are there more codes?

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Check for vacuum leak

Posted on May 31, 2010

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