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

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.

Description	Error signal received from PCM
Detection condition	Blind spot monitoring (BSM) control module (LH) receives the error signal from the PCM for 2 s or more with the ignition switched ON (engine off or on).
Fail-safe	Blind spot monitoring (BSM) system is stopped.
Possible cause	DTCs are stored in the PCM. PCM malfunction DTCs are stored in the instrument cluster. Instrument cluster malfunction Blind spot monitoring (BSM) control module (LH) malfunction
System wiring diagram	Not applicable