Service Update for Inventory and Customer Vehicles-OBD System Improvements-Reprogram Engine Control Module-Expires w/8 yr-80,000 mi (130,000 km) Emission Controller Warranty Period

THIS SERVICE UPDATE INCLUDES VEHICLES IN DEALER INVENTORY AND CUSTOMER VEHICLES THAT RETURN TO THE DEALERSHIP FOR ANY REASON, AND WILL EXPIRE AT THE END OF THE INVOLVED VEHICLE'S 8 YEAR / 80,000 MILE (130,000 KM) EMISSION CONTROLLER WARRANTY PERIOD.

This bulletin provides a service procedure to reprogram the Engine Control Module (ECM) calibration on certain 2006 Buick Lucerne; Cadillac DTS vehicles, equipped with 4.6L V8 (RPO L37 - VIN 9, RPO LD8 - VIN Y) engines; 2006 Chevrolet Cobalt; Saturn Ion vehicles, equipped with 2.2L 4-cylinder (RPO L61 - VIN F) engines; 2006 Buick Rainier; Chevrolet Trailblazer; GMC Envoy vehicles, equipped with 4.2L I-6 (RPO LL8 - VIN S) engines. The revised calibration includes Secondary Air Injection Reaction (SAIR) OBD system improvements that should be installed as soon as practical. To verify if an updated calibration is required, refer to the following procedure in this bulletin.

This service procedure should be completed as soon as possible on involved vehicles currently in dealer inventory and customer vehicles that return to the dealership for any reason during the New Vehicle 8 year / 80,000 mile (130,000 km) Emission Controller Warranty period.

A list of involved vehicles currently in dealer inventory is available on the "Service Update Bulletin Information" link under the "Service" tab in DealerWorld (US), used to release this bulletin. Customer vehicles that return to the dealership for any reason, and are still covered under the vehicle's emission controller warranty, and are within the VIN breakpoints provided below, should be checked for vehicle eligibility in the appropriate system listed below.

Important: Dealers/retailers are to confirm vehicle eligibility prior to beginning repairs by using the system(s) below. Not all vehicles within the above breakpoints may be involved.

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 TIS 2 WEB website with the following calibration updates:

If you cannot access the calibration, call the Techline Customer Support Center and it will be provided.

GMVIS or AS/400 (US Saturn) must be checked to determine if a specific vehicle requires this action. If the system indicates that Service Update Bulletin 07132 remains ‘open’ and ECM reprogramming has not taken place, reprogram the ECM using a Tech 2® scan tool with the calibration update from TIS 2 Web.

Tech 2 Pass-Thru Method for the Engine Control Module (ECM)

Notice: Before reprogramming, please check the battery condition to prevent a reprogramming error of any of the modules due to battery discharge. Battery voltage must be between 12 and 16 volts during reprogramming. If the vehicle battery is not fully charged, use jumper cables from an additional battery. Be sure to turn off or disable any system that may put a load on the battery, such as automatic headlamps, daytime running lights, interior lights, heating, ventilation, and air conditioning (HVAC) system, radio, engine cooling fan, etc. A programming failure or control module damage may occur if battery voltage guidelines are not observed.

The ignition switch must be in the proper position. The Tech 2® prompts you to turn ON the ignition, with the engine OFF. DO NOT change the position of the ignition switch during the programming procedure, unless instructed to do so.

Make certain all tool connections are secure, including the following components and circuits:

DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur.

DO NOT turn OFF the ignition if the programming procedure is interrupted or unsuccessful. Ensure that all control module and DLC connections are secure and the Tech 2® operating software is up to date.

1. Verify that there is a battery charge of 12 to 16 volts. The battery must be able to maintain a charge during programming. Use an additional jump battery, if necessary. Only use approved Midtronics charger or Jumper Packs, etc. to maintain proper battery voltage during programming.
2. Reprogram the engine control module (ECM). Refer to SI and Service Programming System (SPS) documentation for ECM programming instructions, if required.

For vehicles repaired under this service update, use:

To receive credit, submit a claim with the information below: