DTC U0557: Invalid Data Received From Front Controls Interface Module "A": Action
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This DTC sets if the SECM receives invalid data from the FCIM. Using a diagnostic scan tool, RETRIEVE and DIAGNOSE all FCIM DTCs. REFER to the appropriate Information and Entertainment System article. If the diagnostic scan tool cannot communicate with the FCIM, REFER to appropriate Module Communications Network article. If no DTCs are set in the FCIM, the concern may be intermittent. SET the ignition to OFF. DISCONNECT and INSPECT all FCIM electrical connectors and related in-line connectors for corrosion, bent pins, pushed-out pins and spread terminals. REPAIR as necessary.