Instrument Cluster Description and Operation: Odometer
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
The Instrument Panel Cluster Control Module displays the vehicle odometer in the driver information center. The ECM sends a distance rolling count serial data message to the body control module (BCM). The BCM uses this information to calculate the vehicle odometer value. This calculated odometer value is then sent via serial data to the Instrument Panel Cluster Control Module to be displayed.
Software checks are in place to ensure these modules, and their stored odometer information, can not be moved or transferred between different vehicles.