Question about 2006 Pontiac Grand Prix

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PO 411 code / 06 Grand Prix

I bought the car used last yr with 28xxx and every morning last year when it was cold the pump was really loud for a few mins and fade away slowly. Now the po411 code is coming up and now I'm not hearing the pump this year at all when it is cold, think the pump is not working. Is it normal for the pump to be so loud like that or was something going out then??? Now with this code on the Auto Start does not work and that is a bummer. Is this something that a "shade tree" repair person can tackle??? LOL Thank in advance for any help with solving this problem.

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  • GJCamp Dec 28, 2008

    I had the same noise happen every cold morning. It sounded like a fan blade rubbing until the car warmed up.

    I found out that this was a known issue and that the dealer had a fix which was to bend a cowling away from rubbing on the noise maker.

    This should take care of that cold start noise.


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The pump should be fairly quiet. There not too hard to replace, just a hose and a power connection. Check the fuse that works the pump first. If it is blown you will probably need a new pump.

Posted on Dec 01, 2008

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Hi there:
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If this is right, this code refers to the emissions system. The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.

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Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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