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DTC U0073 Control Module Communication Bus OFF; DTC U0105 Lost Communication with ECM; DTC U0121 Lost Communication with Anti-lock Brake System (ABS) Control Module: Description

The power steering ECU assembly receives signals from the HV control ECU, skid control ECU, and steering control ECU via CAN communication.

DTC DETECTION ITEM AND TROUBLE AREA

DTC No.	DTC Detection Item	Inspection Area
U0073	CAN communication error (CAN bus is off)	CAN communication system
U0105	HV control ECU communication error	CAN communication system HV control ECU (when U0105 only is output)
U0121	Skid control ECU communication error	CAN communication system Skid control ECU (when U0121 only is output)

HINT:

When two or more DTCs starting with "U" are output simultaneously, inspect the connectors and wire harness of each ECU.
If the power steering ECU assembly detects DTC U0121 only, it adjusts the amount of power assistance for a speed of 100 km/h (62 mph) and continues system control.