DTC U0420: Invalid Data Received From Power Steering Control Module
WARNING: This page is about a different car, the 2019 Subaru Ascent. However, it is still accessible from the selected car via links, so may be relevant.
DTC detecting condition:
CAN data from electric power steering Control Module is abnormal.
Trouble symptom:
There is no effect on MFD operation/display.
NOTE:
For the diagnostic procedure, refer to DTC U0074. Ref. to MULTI-FUNCTION DISPLAY (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0074 CONTROL MODULE COMMUNICATION BUS "BODY-CAN" OFF .