DTC U0121-00: Communication Error With DSC HU/Control Module [Vehicle Control Module]: Outline

DTC U0121:00 (VEHICLE CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Communication error with DSC HU/Control Module
Detection condition	The vehicle control module (VCM) cannot receive CAN signal from DSC HU/Control Module for 10 s.
Fail-safe	(See DTC TABLE [VEHICLE CONTROL MODULE] .)
Possible cause	Malfunction in CAN communication line between vehicle control module (VCM) and DSC HU/Control Module DSC HU/Control Module malfunction Vehicle control module (VCM) malfunction (built into body control module (BCM))
System wiring diagram	Not applicable