Road Noise Heard Behind Front Seats (Seal Sheet Metal Seams)

Some customers may comment that road noise can be heard coming from the area behind the front seats.

This condition may be caused by an open sheet metal seam in the metal support panel between the frame rail and the rocker panel.

1. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in the General Information Sub-section of the Service Manual.
2. Locate the support panel between the underbody frame rail and the rocker panel. It is in the middle of the underbody of the vehicle just behind the front doors. The support panels on both sides of the vehicle must be sealed.
3. Clean both the front and back sides of the support panel as required.



4. Apply Medium Body Seam Sealing Compound, P/N 12378500 (in Canada, P/N 10952233),, to the front side of the support panel at the locations shown by the arrows in the illustration above. Use a small brush to force the sealer into the open seams and corners of the support panel.



5. Apply Medium Body Seam Sealing Compound, P/N 12378500 (in Canada, P/N 10952233),, to the rear side of the support panel at the locations shown by the arrows in the illustration above. Use a small brush to work the sealer into the open seams and corners of the support panel.
6. Lower the vehicle

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: