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