DTC U045A: Invalid Data Received From Parking Assist Control Module A: Action
WARNING: This page is about a different car, the 2015 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.
CARRY OUT a self-test of the PAM. If the diagnostic scan tool indicates the module is not responding, REFER to MODULE COMMUNICATIONS NETWORK . If PAM DTCs are present, REFER to PARKING AID SYSTEM - AUDIBLE . If there are no DTCs in the PAM, SET the ignition to OFF.
DISCONNECT and INSPECT all PAM electrical connectors and related inline connectors for corrosion, bent pins, pushed-out pins and spread terminals. REPAIR as necessary.