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

System malfunction location	Error signal received from PCM
Detection condition	Communication error between PCM and vehicle control module (V/C-module)
Fail-safe	Inhibits the Mazda radar cruise control (MRCC) system control
Possible cause	PCM malfunction (engine speed signal malfunction) Vehicle control module (V/C-module) malfunction
System wiring diagram	Not applicable