Unsuccessful Programming Recovery
WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
In the event of an interrupted or unsuccessful programming event, perform the following steps:
- DO NOT turn the ignition OFF. Ensure that all ECU, DLC and programming tool connections are secure and the TIS terminal operating software is up to date.
- Attempt to reprogram the ECU using the Replace and Program ECU instructions above.
- If the ECU can still not be programmed, turn the ignition OFF, disconnect battery, and wait for 15 minutes.
- Connect battery, turn the ignition ON and attempt to reprogram the ECU using the Replace and Program ECU instructions above. The ECU should program.
- If the ECU still cannot be programmed, replace the ECU.