DTC U0557: Invalid Data Received From Front Controls Interface Module "A": Action
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
CHECK for additional RCM and FCIM DTCs. For RCM DTCs, RETURN to the beginning of this chart. DIAGNOSE all other DTCs first. For FCIM DTCs, REFER to the FCIM DTC Chart in the appropriate Information and Entertainment System - General Information article