Question about 2003 GMC Envoy Xl

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Knocking in the rear panel

I have knocking in the rear passenger side panel. knocking is constant whether moving or not as long as the vehicle is on. knocking seems to be coming from between the rear panel and rear fender under the rear windshield.

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  • Anonymous Mar 22, 2014

    this knock is not constant.

  • Rupert
    Rupert Sep 06, 2014

    I have a 2004 envoy xl, it is not the fuel pump, it is the rear a/c unit. mine does it every so often and its speed nor duration are affected by the a/c switches. it stops after 30 to 45 seconds and the all is quite.



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If the vehicle is on, but not moving, the only thing in that area that would be "in motion" and capable of causing a 'knock' is the electric fuel pump. That should be your problem. The only other possible cause would be if you have some sort of electric/computer controlled ride system which is trying to pump up and is making a knocking sound. There is nothing else in that area of the vehicle that can cause that when you are parked.

Posted on Nov 13, 2009


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