On-Board Diagnostic System Software Upgrade-Reprogram Powertrain Control Module (PCM)

This bulletin provides information about installing new Powertrain Control Module (PCM) software and calibration on certain 2005 Cadillac CTS-V model vehicles equipped with a 5.7-liter (RPO LS6 - VIN S) V8 engine. The revised calibration includes OBD system improvements that should be installed as soon as practical. Install the new calibration on all affected vehicles identified in this bulletin, including vehicles in new dealer inventory and any vehicles that return for service, for any reason, during the applicable 8 year/80,000 mile (130,000 km.) emission controller warranty coverage period. To verify if an updated calibration is required, refer to the following procedure in this bulletin.

Important: Do not attempt to order the calibration number from GMSPO. The calibration numbers are programmed into the PCM via a Techline Tech 2 scan tool and the Techline Information System (TIS) 2000 terminal with the calibration update. Use data version 5.0 or later, broadcasted to dealers on April 30, 2005 (May 5, 2005 in Canada); and on TIS CD-ROM version 5.0 / 2005, mailed to dealers beginning May 11, 2005.

The GM Vehicle Inquiry System (GM VIS) must be checked to determine if a specific vehicle requires this action. If GMVIS indicates that this System Software Upgrade remains ‘open’ and PCM reprogramming has not taken place otherwise after the TIS Broadcast or CD-ROM availability dates identified in this bulletin, reprogram the PCM using a Tech 2 scan tool with the calibration update from Techline Information System (TIS) 2000.

Notice: Before reprogramming, please check the battery condition to prevent a reprogram error of the PCM 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 TIS terminal operating software is up to date. Attempt to reprogram the control module. If the control module cannot be programmed, replace the control module.

Tech 2 Remote Programming

1. Use the normal "request method" through "Service Programming System" to request information from the vehicle.

Important: The Tech 2 scan tool will provide the following information if no vehicle identification number is embedded in the powertrain control module: "Write down the VIN from the vehicle. Turn OFF ignition. Disconnect Tech 2 from vehicle and connect it to PC".

2. At the Techline Terminal enter TIS SPS programming system.
3. Select Tech 2 from the "Select Diagnostic Tool" window
4. Select Reprogram ECU from the "Select Programming Process" window
5. Select Vehicle from the "Select ECU Location" window
6. Select Next to go to the "Preparing for Communication" instruction Screen
7. Select Next to view the "Validate Vehicle ID Number" screen. If the Vehicle ID Number does not appear on the screen, manually insert the VIN into the VIN window of the "Validate Vehicle ID Number" screen
8. Select Next to view the "Supported Controllers" screen.
9. Select PCM/VCM Powertrain/Vehicle Control Module from "Supported Controllers" window.
10. Select Next to view the "Select Programming Type" window
11. Select Normal from the "Select Programming Type" window
12. Select Next to view the "Service Programming System Calibration Selection" screen
13. Select Next to view "Summary" screen
14. Verify that the following information is displayed the on the "Summary" screen (shown below this procedure).
15. Select Next to download the calibration to the Tech 2.
16. Back at the vehicle enter "Service Programming Systems."
17. Select "Program ECU" and follow on screen instructions.
18. Make sure to turn OFF the ignition for 30 seconds after the "Programming is Complete" screen is displayed. Clear diagnostic trouble codes (DTCs), if required.

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