Service Update for Inventory Vehicles Only - Improved Idle Control Calibration - Reprogram PCM - Expires May 31, 2007

THIS SERVICE UPDATE INVOLVES VEHICLES IN DEALER INVENTORY ONLY AND WILL EXPIRE MAY 31, 2007.

This bulletin provides a service procedure to reprogram the Powertrain Control Module (PCM) on certain 2007 Chevrolet Silverado HD and GMC Sierra HD vehicles, equipped with 6.0L V-8 (RPO LY6 - VIN K) engines. Some of these vehicles may exhibit an engine stall while shifting into drive or reverse 15 to 25 seconds after engine startup when the coolant temperature is between 8°C (46°F) and -16°C (3°F). This condition does not affect vehicles in motion. To prevent this condition from occurring, a new calibration has been released.

This service procedure should be completed on involved vehicles currently in dealership inventory as soon as possible but no later than May 31, 2007, at which time this bulletin will expire.

A list of involved vehicles currently in dealer inventory is attached to the Administrative Messages (GM) or Dealer Communications (Canada), used to release this bulletin.

Important: Dealers are to confirm vehicle eligibility prior to beginning repairs by using the GM Vehicle Inquiry System (GMVIS).

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 with the calibration update. Use TIS 2 Web version 2.5 for 2007 (available on 02/18/07) and on TIS DVD version 3.0/2007 or later, which will be mailed to dealers on 03/14/2007. The Tech 2 diagnostic tool must also be updated with version 27.003 or later. If you cannot access the calibration, call the Techline Customer Support Center at 1-800-828-6860 (English) or 1-800-503-3222 (French) and it will be provided.

The "Required Field Actions" section of the GM Vehicle Inquiry System (GMVIS) must be checked to determine if a specific vehicle requires this action. If GMVIS indicates that Service Update Bulletin 07054 remains ‘open’ and PCM reprogramming has not taken place, reprogram the PCM using a Tech 2® scan tool with the calibration update from TIS 2 Web.

Tech 2 Pass-Thru Method for the Powertrain Control Module (PCM)

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.

Important:  If pass-thru programming fails (i.e. hangs up) try remote programming. A "Candi" module is necessary.

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 TIS 2 Web 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. Connect the Tech 2 to the vehicle and TIS 2 Web.
3. Turn the ignition to the ON position with the engine OFF.
4. After all warning chimes inside the vehicle have stopped, turn on the Tech 2.
5. On TIS 2 Web, go into SPS Programming.
6. Select Pass Thru programming.
7. Follow instructions on TIS 2 Web. When you get to the Supported Controllers screen.

7.1.	Scroll down in the top box and select PCM/VCM (Powertrain Control Module/Vehicle Control Module).

7.2.	In the lower box, select Normal.

7.3.	Select Next.

8. Select NEXT when the calibrations screen displays.
9. Follow on-screen prompts until programming is completed. Additional reprogramming time may be experienced due to required downloading of operating system files with calibration files.
10. When programming is complete.

10.1.

Turn off Tech 2.

10.2.

Turn the ignition switch to the OFF position.

11. Wait 30 seconds.
12. Turn ignition switch to the ON position with engine off.
13. Turn on the Tech 2.
14. Go into diagnostics and check for DTC codes.
15. Clear all codes.

For vehicles repaired under this service update, use: