Underbody Rattle (Modify Assist Step)

Some customers may comment on a rattle in the underbody.

The dealer installed tubular assist running boards may be contacting the frame.

Inspect the top corners of the tubular assist step front brackets for contact with the frame. Clearance should be at least 5 mm (5/16 in). If there is contact or a gap of less than 5 mm (5/16 in) between the front bracket and the frame, grind the tubular assist step front bracket to greater than 5 mm (5/16 in). After grinding, paint the exposed metal per GM 4901-M-D-2005 Approved Refinish Materials booklet. The information for the GM Approved Refinish Materials booklet will now be online at the GM GOODWRENCH WEB SITE ONLY. Printed books have been discontinued. Steps to the site are as follows:

1. Go to www.gmgoodwrench.com
2. Click on GM Collision Parts.
3. Click on GM Technical Repair information.
4. Click on Paint Shop.

For vehicles repaired under warranty, use: