Important: Do NOT program a control module unless you are directed by a service procedure or you are directed by a General Motors Corporation service bulletin. Programming a control module at any other time will not permanently correct a customers concern.

Ensure that the following conditions are met before programming a control module:

1. Turn OFF the ignition.
2. Install the Tech 2 to the data link connector (DLC).
3. Turn ON the ignition, with the engine OFF.
4. Turn OFF all vehicle accessories.
5. With the Tech 2, select Service Programming.
6. Identify vehicle information as requested by the Tech 2.
7. Select the type of module you are programming.
8. Select the type of programming to be performed.
9. Verify the displayed VIN with the vehicle VIN. If the displayed VIN does not match the actual VIN, write down the actual VIN and correct the VIN at the Techline terminal.
10. When complete, Exit Service Programming.
11. Turn OFF the Tech 2 and disconnect the Tech 2 from the vehicle.
12. Turn OFF the ignition.
13. Connect the Tech 2 to the Techline terminal.
14. Select Service Programming.
15. Select Tech 2 as the tool you are using.
16. Select the type of programming to be performed.
17. Verify the displayed VIN with the vehicle VIN. Correct the VIN as necessary.
18. Select the type of module you are programming.
19. Identify what type of programming that you are performing.

•	Normal--This type of programming is for updating an existing calibration or programming a new controller.

•	Vehicle configuration index (VCI)--This selection is used if the vehicle VIN is unavailable or not recognized by the Techline terminal. Observe, you will need to contact the Techline Customer Support center to use this option.

•	Reconfigure--This is to reconfigure a vehicle, such as tire size and axle ratio changes.

20. Select the appropriate calibration file.
21. Verify that all connections are secure.
22. Select Reprog to initiate the download of the new calibration to the Tech 2.
23. After the download is complete, turn OFF the Tech 2.
24. Disconnect the Tech 2 from the Techline terminal.
25. Install the Tech 2 to the data link connector (DLC).
26. Turn ON the Tech 2.
27. Turn ON the ignition, with the engine OFF.
28. Select Service Programming.

Important: DO NOT turn OFF the ignition if the programming procedure is interrupted or unsuccessful. Ensure that all the PCM and DLC connections are secure and the Techline operating software is up to date. Attempt to reprogram the control module. If the control module cannot be programmed, replace the control module. Refer to Powertrain Control Module Replacement .

29. Select Program.
30. After the download is complete, EXIT Service Programming.
31. Turn OFF the ignition for 30 seconds.
32. Turn OFF the Tech 2.
33. If a control module is replaced the following service procedures must be performed:

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1. With a scan tool, clear the DTCs.
2. Attempt to start the engine.
3. Repeat the Service Programming procedure if the engine does not start or operates poorly. Perform the following procedures before programming the PCM:

•	Ensure that the control module and DLC connections are OK.

•	Ensure that the Techline operating software is up to date.

•	Ensure that the calibration part number is correct for the vehicle.

4. Attempt to program the control module. If the control module still cannot be programmed properly, replace the control module. Refer to Powertrain Control Module Replacement . You must program the replacement control module.

Important: 

Ensure that all connections are secure at the following locations:

1. Obtain the VIN of the vehicle for which the control module is being programmed.
2. With the Techline terminal, select Service Programming.
3. Select Tech 2, Reprogram ECU, and Off-Board Programming Adapter as the ECU location.
4. Connect the control module, Off-Board Programming Adapter, and the Tech 2 as described on the Techline terminal. Ensure that you use the correct harness connector from the Off-Board Programming Adapter kit.
5. With the Tech 2, select Service Programming Request Information function. The Tech 2 communicates with the control module and receives the access code.
6. With the Tech 2, exit the Service Programming Request Information.
7. Disconnect the Tech 2 from the Off-Board Programming Adapter.
8. Connect the Tech 2 to the Techline terminal.
9. Turn ON the Tech 2.
10. With the Techline terminal, enter the VIN of the vehicle that will be receiving the control module.
11. The Techline terminal will display the message, attaching to database.
12. Identify what type of programming that you are performing.
13. Select the appropriate calibration file.
14. Verify that all connections are secure.
15. The Techline terminal displays a summary screen that summarizes your selections. After confirming you choices, the Techline terminal automatically loads the calibration files to the Tech 2.
16. After the download is complete, turn OFF the Tech 2.
17. Disconnect the Tech 2 from the Techline terminal.
18. Connect the Tech 2 to the Off-Board Programming Adapter.
19. With the Tech 2, select Service Programming.

Important: DO NOT turn OFF the Off-Board Programming Adapter if the programming procedure is interrupted or unsuccessful. Ensure that the control module and the Off-Board Programming Adapter connections are secure and the Techline operating software is up to date. Attempt to reprogram the control module. If the control module cannot be programmed, replace the control module.

20. With the Tech 2, select Program.
21. After the download is complete, exit Service Programming.
22. Turn OFF the Off-Board Programming Adapter.