DTC U0556: Invalid Data Received From Front Display Interface Module: Action
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This DTC sets if the data in the multimedia system message from the FCIM has not been updated within the allotted time. RETRIEVE and DIAGNOSE all FCIM and GWM DTCs. REFER to the Diagnosis and Testing in the appropriate Information and Entertainment System - General Information article or Multifunction Electronic Modules article. If there are no DTCs in the FCIM or GWM, the DTC may be caused by an intermittent concern. SET the ignition to OFF. DISCONNECT and INSPECT all FCIM and GWM electrical connectors and related in-line connectors for corrosion, bent pins, pushed-out pins and spread terminals. REPAIR as necessary.