Cruise Control Turns Off During Operation (Reprogram ECM) (09-08-68-001)

Publication date: 2009-11-13
Reference number: 09-08-68-001

Cruise Control Turns Off During Operation (Reprogram ECM)

TECHNICAL SERVICE BULLETIN

Reference Number(s): 09-08-68-001, Date of Issue: November 13, 2009

Affected Model(s):

2008-2009 Cadillac Escalade, Escalade ESV, Escalade EXT; 2007-2009 Chevrolet Silverado; 2008-2009 Chevrolet Avalanche, Suburban, Tahoe; 2007-2009 GMC Sierra; 2008-2009 GMC Yukon, Yukon Denali, Yukon XL, Yukon Denali XL; 2008-2009 HUMMER H2

Condition

On rare occasions, some customers may comment that the cruise control turned off. This typically occurs during operation and while pulling up and releasing both driver door window switches or activating the heated windshield washer fluid system in cold weather conditions with a battery charge below 80%.

Cause

Cruise control command cancellation is caused by a voltage spike that occurs when the driver door window switches are released or when the heated washer fluid system is activated.

Correction

A revised calibration has been developed to address this condition. Technicians are to reprogram the ECM with the latest calibrations available. This new service calibration is available on TIS2WEB using the Service Programming System (SPS). Refer to the SPS procedures in SI. SPS may require the technician to select the calibration from the ECM calibration screen.

NOTE: This calibration update should only be used when this loss of cruise control condition is experienced.

When using a Tech 2® or a multiple diagnostic interface (MDI) 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

For vehicles repaired under warranty, use:

Warranty Information

Labor Operation	Description	Labor Time
N9629*	Reprogram ECM to Correct Cruise Control Drop-Off Issue	0.4 hr
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.