Question about 2004 Pontiac Bonneville

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2004 Pontiac Bonneville Check Engine Light

I have a 2004 Pontiac Bonneville and the check engine light keeps coming on. I have taken it to Auto Zone a couple of times and they say it is the gas cap. I have since replaced the gas cap and it was fine for about 10 days then the check engine light came on again. Also, when the light is on, the engine does not seem to hit on all cylinders incessantly. Could this be a transmission problem?

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  • yadayada
    yadayada May 11, 2010

    those guys at autozone are not TECHNICIANS!!!! TAKE IT TO A DEALER FOR CORRECT DIAGNOSIS



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Do you fill the gas tank with the key on?

Try disconnecting the battery for 1/2 hour an then reconnect and drive for 10 miles. It may run rough for this period. This will clear codes from memory.

Posted on May 27, 2009


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Posted on Jan 02, 2017


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Engine check light comes on and stays on for awhile then goes off. Dometimes when I fill the gas tank the check engine light comes on. is something to do with the gas cap or the instrument lights.


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