Unsuccessful Programming Recovery

WARNING: This page is about a different car, the 2021 GMC Sierra 3500 HD and 2021 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

If programming a control module is not successful, perform the following procedure:

Verify the control module, data link connector and programming tool connections are secure and the tool software is up to date.
Ignition - On / Vehicle - In Service Mode
Access SPS and follow the on-screen instructions for the control module: K34 Glow Plug Control Module
Verify the control module programming is successful.
- If the programming is not successful
1. Ignition/Vehicle - Off - For greater than 1 min
2. Ignition - On / Vehicle - In Service Mode
3. Access SPS and follow the on-screen instructions for the control module: K34 Glow Plug Control Module
  - If the programming is not successful - Replace the component: K34 Glow Plug Control Module
  - Go to next step: If the programming is successful
4. All OK.
- Go to next step: If the programming is successful
All OK.