DTC U2121-00: Communication Error With Vehicle Control Module (VCM) [DSC HU/Cm]: Outline

System malfunction location	Communication error with vehicle control module (VCM)
Detection condition	The DSC HU/CM cannot receive CAN signal from the vehicle control module (VCM).
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 vehicle control module (VCM) and DSC HU/CM
System wiring diagram	Not applicable
Connector diagram	Not applicable