DTC U0401: Invalid Data Received From ECM/PCM 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 PCM DTCs. DIAGNOSE and REPAIR any DTCs that are retrieved. For RCM DTCs, REFER to the RCM - Restraint Control Module DTC Chart. To diagnose PCM DTC, Refer to the applicable Electronic Engine Controls article.