tighten gas cap warning

Discussion in 'North America - Southeast USA' started by detailjohn, Apr 13, 2009.

  1. detailjohn

    detailjohn Rockstar 100 Posts

    Getting this alarm tighten gas cap, and its tight. Check engine light is on.

    Any ideas?

  2. detailjohn

    detailjohn Rockstar 100 Posts

    06 gmc 4.8l cc 4x4
  3. retired2001

    retired2001 Epic Member 5+ Years 5000 Posts

    I know that if the gas cap does not seal, it will throw off the emissions readings. There is probably a sensor that monitors the pres. on the fuel tank. If it is showing a bad reading the CEL might come on. Just a thought. Good luck!
  4. Cableguy

    Cableguy Epic Member 5+ Years ROTM Winner 1000 Posts

    I had that on my buddies 05 Jimmy. Replaced with aftermarket cap...problem fixed
  5. Samplemaven

    Samplemaven New Member

    This just to get my three posts to remove sticky on home page.
  6. 05-Burb

    05-Burb New Member

    Dont buy anything.

    When this tank of gas runs out, buy gas at a different station, then put the gas cap back on as you normally do.

    This should take care of the problem. Usually caused by a bad tank of gas, or the gas cap not put on tightly enough.
  7. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    Bad tank of gas????? Please explain, Thanks.

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