Normal Operation and Fault Conditions
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
With the ignition ON, the diagnostic scan tool communicates with the ABS module over the HS-CAN2. Communications can be interrupted by a wiring condition such as a short to ground, a short to voltage or an open circuit; module failure is also a cause of no communication.