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U198D-83-Message CSWC 1 Plausibility Error (Checksum Calculation)-Value Of Signal Protection Calculation Incorrect

WARNING: This page is about a different car, the 2019 Fiat 500X. 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 (CSWM) 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 .