DTC U0401: Invalid Data Received From ECM/Pcm "A"

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

DTC detecting condition:

When the following conditions are all established.

Data no-receive DTC of monitored node is not displayed in current code.
Fail detection counter of monitored node is not updated 32 times in a row. Or checksum error is detected 3 times in a row.

NOTE:

Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE