Exhaust System - Rattle/Thud Noise On Left Turns/Bumps

TECHNICAL

Bulletin No.: 09-06-05-004

Date: May 20, 2009

Subject: Rattle or Thud Type Noise During Left Turns or While Driving Over Bumps (Perform Repair as Outlined)

Models:
2007-2009 Chevrolet Silverado 1/2 Ton 1500 Series (Including Hybrid)
2007-2009 GMC Sierra 1/2 Ton 1500 Series (Including Hybrid)

Condition

Some customers may comment on a rattle or thud type noise during left turns or while driving over bumps.

Cause

This condition may be caused by contact between the front exhaust hanger and the frame hanger.

Correction

Perform the repair below to eliminate the contact between the front exhaust hanger and the frame hanger.

1. Raise and support the vehicle.





2. Measure the clearance (1) between the front exhaust hanger and the frame hanger. There should be at least 8 mm (0.315 in) clearance. Witness marks may also be visible.

- If the clearance is less than specified, proceed to step 3.
- If the clearance is within specification, diagnose and repair using the information found in SI.

3. Grind or file the front exhaust hanger head until the remaining material measures 4 mm (0.157 in).
4. Lower the vehicle.

Warranty Information





For vehicles repaired under warranty, use the table above.





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