3.6L LLT Engine - MIL/SES Light Illuminated, DTCs P2601 or P2610 Stored (Reprogram ECM)

Some customers may comment that the MIL/SES light is illuminated.

Upon further investigation , technicians may find the following Diagnostic Trouble Code(s) (DTCs ) stored:

Engineering has identified a concern with the ECM software that may cause this condition.

Important: DO NOT replace the ECM for this condition.

If DTC P2601 has set and routine diagnosis using SI does not reveal any obvious cause, reprogram the ECM using the latest calibration.

If DTC P2610 has set, reprogram the ECM with the latest calibration.

An updated ECM calibration is now available to address this concern. This calibration, or any that follow, is designed to address the concern.

Refer to Service Programming System (SPS) using the appropriate Service Information (SI) procedures. Do not attempt to order the calibration number from GMSPO. The calibration numbers required for this service procedure are programmed into control modules via a Techline Tech 2® scan tool and the Techline Information System (TIS) 2000 terminal with the calibration update.

Use data version 8.5 for 2007 or later, available on TIS2Web 08/19/07; and on TIS DVD version 9.0/ 2007 or later, mailed to dealers beginning 09/12/07. As always, make sure your Tech 2® is updated with the latest software version. If you cannot access the calibration, call the Techline Customer Support Center.

For vehicles repaired under the 8 year/80,000 mile (130,000 km) emission controller warranty, use: