DTC U0401-00: Error Signal Received From Pcm: Notes

WARNING: This page is about a different car, the 2018 Mazda CX-9. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0401:00 (360°VIEW Monitor Control Module) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Error Signal Received From PCM
Detection Condition	The 360°view monitor control module detects a signal error from the PCM for a certain period of time or more.
Fail-safe	Vehicle speed is set [655.35 km/h {407.22 mph} or more]
Possible Cause	DTCs are stored in the PCM. PCM malfunction 360°view monitor control module malfunction
System Wiring Diagram	Not applicable