Steering - Drive Belt Noise on Duramax(TM) Diesel Engines
TECHNICALBulletin No.: 12-06-01-002
Date: March 13, 2012
Subject: Drive Belt Noise or Chirp on Duramax(TM) Diesel Engines with Dual Alternators
Models:
2010-2012 Chevrolet Express Equipped with RPOs LGH and KD9
2011-2012 Chevrolet Silverado Equipped with RPOs LGH and K76
2011-2013 Chevrolet Silverado Equipped with RPOs LML and K76
2010-2012 GMC Savana Equipped with RPOs LGH and KD9
2011-2012 GMC Sierra Equipped with RPOs LGH and K76
2011-2013 GMC Sierra Equipped with RPOs LML and K76
Vehicles Built Prior to October 12, 2011
Condition
Some customers may comment on a belt noise or chirp.
Cause
The noise may be caused by the material used in the power steering belt.
A new belt has been developed to reduce the noise.
Correction
Verify the power steering pulley hub height on the pulley. Refer to PI0594A.
Ensure that the power steering pump pulley (1) is flush against the power steering pump shaft (2) with an allowable variance of 0.25 mm (0.010 in).
Replace the power steering belt with the appropriate updated part number shown below.
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
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