DTC U2121-00: Communication Error With Vehicle Control Module (VCM)

U2121-00: (DSC) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with vehicle control module (VCM)
Detection condition	The electronically controlled brake unit/DSC HU/CM cannot receive CAN signal from the vehicle control module (VCM).
Fail-safe	(See DTC TABLE [DSC] .)
Possible cause	Malfunction in CAN communication line between vehicle control module (VCM) and electronically controlled brake unit/DSC HU/CM NOTE: Perform the malfunction diagnosis according to the troubleshooting procedure for the multiplex communication system. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .)
Repeatability verification procedure	Not applicable
System wiring diagram	Not applicable