Air Conditioning (A/C) Compressor and/or Serpentine Belt Noise at Vehicle Startup (Reprogram Powertrain Control Module (PCM)) (07-01-38-010A)

Publication date: 2009-10-06
Reference number: 07-01-38-010A
Supersedes refnos: 07-01-38-010

Air Conditioning (A/C) Compressor and/or Serpentine Belt Noise at Vehicle Startup (Reprogram Powertrain Control Module (PCM))

TECHNICAL SERVICE BULLETIN

Reference Number(s): 07-01-38-010A, Date of Issue: October 06, 2009

Affected Model(s):	2007-2008 Cadillac Escalade Models; 2007-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe; 2007-2008 GMC Sierra, Yukon Models; Equipped With Air Conditioning (RPOs CJ2 or CJ3)
Supercedes:	This bulletin is being revised to update the Condition and Correction information. Please discard Corporate Bulletin Number 07-01-38-010 (Section 01 - HVAC).

Superceded Bulletin(s): 07-01-38-010, Date of Issue: October 1, 2007

Condition

Some customers may comment on air conditioning (A/C) compressor slugging and/or serpentine belt or pulley rattle noise at vehicle startup in warmer outside ambient temperature conditions. Others may describe the noise as a belt chirp or as a thumping/grinding noise coming from the A/C compressor at vehicle startup.

Cause

This condition may be caused by the A/C compressor trying to move liquid refrigerant through the system.

Correction

Do This	Don't Do This
Reprogram the PCM with the latest available calibration.	DO NOT replace the compressor, compressor clutch, serpentine belt and/or the belt tensioner.

A revised PCM calibration has been released to address this condition. Reprogram the PCM using the Service Programming System (SPS) with the latest calibration available on TIS2WEB. Refer to the SPS procedures in SI.
When using a multiple diagnostic interface (MDI) for reprogramming, ensure that it is updated with the latest software version.
When using a Tech 2® for reprogramming, ensure that it is updated with the latest software version.
During programming, the battery voltage must be maintained within the proper range of 12-15 Volts. Only use the approved Midtronics® PSC 550 Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent during programming.

Warranty Information

NOTE: *Please use Failure Code 93 for any warranty claims submitted using this bulletin.

For vehicles repaired under warranty, use:

Warranty Information

Labor Operation	Description	Labor Time	Failure Code
J6354	Powertrain Control Module Engine Reprogramming with SPS	Use Published Labor Operation Time	93 (Technical Service Bulletin)*