April 5, 2026: LEMON Manuals is launched! Read the announcement.

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; DTC U0122 Lost Communication with Vehicle Dynamics Control Module; DTC U0130 Lost Communication with VGRS: Description

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

DTC DETECTING CONDITION AND TROUBLE AREA

DTC No.	DTC Detection Item	Inspection Area
U0073	CAN communication error (CAN bus is off)	CAN communication system
U0105	ECM communication error	CAN communication system ECM (when only U0105 is output)
U0121	Skid control ECU communication error	CAN communication system Skid control ECU (when only U0121 is output)
U0122	Skid control ECU communication error.	Skid control ECU CAN communication system
U130	Steering control ECU communication error.	Steering control ECU CAN communication system

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.