Exhaust System - Underbody Rattle/Buzz/Vibration

TECHNICAL

Bulletin No.: 10-06-05-001

Date: January 05, 2010

Subject: Vibration, Buzz or Rattle Noise from Underbody, Exhaust or Engine Compartment (Verify Condition and Replace Muffler and Pipe Assembly, if Necessary)

Models:
2009 Chevrolet Suburban Heavy Duty (HD)
2009 GMC Yukon XL HD
Equipped with 6.0L V8 Engine RPO LY6
Please Refer to GMVIS

Condition

Some customers may comment on a vibration, buzz or rattle noise coming from the underbody, exhaust or engine compartment. This condition occurs most often during light throttle, 48-64 km/h (30-40 mph), when vehicle is warm.

Cause

This condition may be caused by the center baffle tube, within the muffler, being loose in the press-fit connector joint.

Correction

Important
Do not attempt any repairs on the vehicle until you verify the condition is present by following the steps below:

1. Warm up the vehicle by driving approximately 8 km (5 mi).
2. Pull the vehicle up parallel to a wall and roll down the side windows.
3. While in Drive, apply the brake and raise engine speed to 1600-1800 RPM. If this condition exists, a vibration/rattle noise should be present coming from the muffler.

- If no noise is evident, the function may be normal, or the condition may have a different cause. Refer to SI for any further related diagnostics.
- If this condition is identified, replace the muffler and pipe assembly with a new design assembly that has an improved center baffle tube joint interface. Refer to Exhaust Muffler Replacement (With LY6) in SI.

Parts Information





Warranty Information





For vehicles repaired under warranty, use the table above.





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