DTC U045A: Invalid Data Received From Parking Assist Control Module A: Description
WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
DTC sets when the IPC receives rear parking aid data when the IPC is not configured for parking aid. See MODULE CONFIGURATION SYSTEM - F150 and PARKING AID SYSTEM - F150