DTC U0100-00: Communication Error With Pcm [DSC HU/Cm]: Outline

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

System malfunction location	Communication error with PCM
Detection condition	The DSC HU/CM cannot receive CAN (CAN BUS No. 1 and CAN BUS No. 2) signal from the PCM.
Fail-safe	Refer to "DTC Table" and "Fail-safe Function Malfunction Contents Table". (See DTC TABLE [DSC HU/CM (US)] .)
Possible cause	Malfunction in CAN communication line between PCM and DSC HU/CM
System wiring diagram	Not applicable
Connector diagram	Not applicable