Replace and Program Control Module or Reprogram Control Module
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.
To program a replacement or an existing K56 Serial Data Gateway Module, perform the following procedure:
- Access the Service Programming System (SPS) and follow the on-screen instructions.
- On the SPS Supported Controllers screen, select K56A Serial Data Gateway Module Processor 1 - Programming and follow the on-screen instructions.
- On the SPS Supported Controllers screen, select K56B Serial Data Gateway Module Processor 2 - Programming and follow the on-screen instructions.
- Clear DTCs.
NOTE:
When programming K56 Serial Data Gateway Module, both processor 1 and processor 2 need to be updated. After programming processor 1, re-enter SPS and program processor 2.