DTC U0301 09: Error Signal Received From Pcm: Notes

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0301:09 (VEHICLE CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Error signal received from PCM
Detection condition	There is an error in the following signals sent from the PCM. Brake switch signal Cruise control system control signal
Fail-safe	Inhibits the Mazda radar cruise control (MRCC) system control Inhibits the forward obstruction warning (FOW) system control^1 ^1 : Enabled depending on malfunction content.
Possible cause	PCM malfunction DSC HU/CM malfunction Vehicle control module (V/C-module) malfunction
System wiring diagram	Not applicable