Replace and Program ECU or Reprogram ECU

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 ECU, perform the following procedure:

NOTE:

Due to continuous improvements, the on screen selections may vary from instructions below.
It is required to program both the B218L Side Object Sensor Module - Left and B218R Side Object Sensor Module - Right when a programming event is required.

Access the Service Programming System (SPS) and follow the on-screen instructions.
On the SPS Supported Controllers screen, select B218L Side Object Sensor Module - Left.
On the SPS Select Function / Sequence screen, select Programming
Clear DTCs.
On the SPS Supported Controllers screen, select B218R Side Object Sensor Module - Right.
On the SPS Select Function / Sequence screen, select Programming
Clear DTCs.