Question about 2003 GMC Envoy Xl
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.
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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Posted on Jan 02, 2017
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