U0121-00 - Lost Communication With Anti-Lock Brake System (Abs) Control Module "A"

WARNING: This page is about a different car, the 2021 Jeep Grand Cherokee L. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

This DTC indicates a communication issue has occurred between the Sending control module (Brake System Control Module (BSCM)) and the Reporting control module(s) that set this fault.

The COMMUNICATION DIAGNOSTIC PROCEDURE MUST be performed before replacing any component(s) or module(s). Perform the COMMUNICATION DIAGNOSTIC PROCEDURE. Refer to COMMUNICATION DIAGNOSTIC PROCEDURE .