DTC U0401-68; Error Signal Received From Pcm: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

Description	Error signal received from PCM
Detection condition	Blind spot monitoring (BSM) control module receives the error signal from the PCM for 1 s or more.
Fail-safe	Blind spot monitoring (BSM) system is stopped.
Possible cause	DTCs are stored in the PCM. PCM malfunction Blind spot monitoring (BSM) control module malfunction
System wiring diagram	Not applicable