DTC U0073: Control Module Communication Bus OFF; DTC U0121: Lost Communication with Anti-lock Brake System (ABS) Control Module: Description

The power steering ECU receives signals from the skid control ECU (ECB ECU) via CAN communication.

DTC DETECTION CONDITION AND TROUBLE AREA

DTC No.	DTC Detection Condition	Trouble Area
U0073	CAN communication error (CAN bus is off)	CAN communication system
U0121	Skid control ECU communication error	CAN communication system Skid control ECU (when only U0121 is output)

HINT:

When 2 or more DTCs starting with [U] are output simultaneously, inspect the connectors and wire harness of each ECU.