DTC U0121: Lost Communication with the Anti-lock Brake System (ABS) Control Module: Action
WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
Implement a ABS module self-test. If the scan tool indicates the module is not responding, REFER to COMMUNICATIONS NETWORK to diagnose the network communication concern. If ABS module DTCs are present, REFER to ANTI-LOCK CONTROL -- NON-HYBRID or ANTI-LOCK CONTROL -- HYBRID to diagnose the ABS system fault.