DTC Diagnostic Strategy
WARNING: This page is about a different car, the 2020 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
If the module DTC list results in a large number of DTCs, diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011, and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern DTCs are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active DTCs before diagnosing any historic DTCs.