DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0130: Lost Communication with Steering Effort Control Module; DTC U0134: Lost Communication with DRS Module; DTC U023A: Lost Communication with Front Camera Module; DTC U1104: Lost Communication with Driving Support ECU [09/2018 - 10/2023]: Description

The power steering ECU (rack and pinion power steering gear assembly) receives signals from the steering sensor, skid control ECU (brake actuator assembly)*1, skid control ECU assembly*2, VGRS ECU (front steering control ECU)*3, DRS ECU (rear steering control ECU)*3, forward recognition camera*4, object recognition camera*5, driving support ECU assembly*5 and ECM via CAN communication.

*1: w/ Vacuum Brake Booster
*2: w/o Vacuum Brake Booster
*3: w/ Variable Gear Ratio Steering System
*4: for Mono Camera Type
*5: for Stereo Camera Type

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Return-to-normal Condition	Note
U0100	Lost Communication with ECM / PCM "A"	Lost communication with ECM	ECM CAN communication system Rack and pinion power steering gear assembly	EPS warning light: Does not come on	After the CAN communication returns to normal	-
U0126	Lost Communication with Steering Angle Sensor Module	Lost communication with steering sensor	Steering sensor CAN communication system Rack and pinion power steering gear assembly	EPS warning light: Comes on	After the CAN communication returns to normal	-
U0129	Lost Communication with Brake System Control Module	Lost communication with skid control ECU (brake actuator assembly) (w/ Vacuum Brake Booster) Lost communication with skid control ECU assembly (w/o Vacuum Brake Booster)	Skid control ECU (brake actuator assembly) (w/ Vacuum Brake Booster) Skid control ECU assembly (w/o Vacuum Brake Booster) CAN communication system Rack and pinion power steering gear assembly	EPS warning light: Comes on	After the CAN communication returns to normal	-
U0130	Lost Communication with Steering Effort Control Module	Lost communication with VGRS ECU (front steering control ECU)	VGRS ECU (front steering control ECU) CAN communication system Rack and pinion power steering gear assembly	EPS warning light: Comes on	After the CAN communication returns to normal	w/ Variable Gear Ratio Steering System
U0134	Lost Communication with DRS Module	Lost communication with DRS ECU (rear steering control ECU)	DRS ECU (rear steering control ECU) CAN communication system Rack and pinion power steering gear assembly	EPS warning light: Does not come on	After the CAN communication returns to normal	w/ Variable Gear Ratio Steering System
U023A	Lost Communication with Front Camera Module	Lost communication with forward recognition camera (for Mono Camera Type) Lost communication with object recognition camera (for Stereo Camera Type)	Forward recognition camera (for Mono Camera Type) Object recognition camera (for Stereo Camera Type) CAN communication system Rack and pinion power steering gear assembly	EPS warning light: Does not come on	After the CAN communication returns to normal	-
U1104	Lost Communication with Driving Support ECU	Lost communication with forward recognition camera (for Mono Camera Type) Lost communication with driving support ECU assembly (for Stereo Camera Type)	Forward recognition camera (for Mono Camera Type) Driving support ECU assembly (for Stereo Camera Type) CAN communication system Rack and pinion power steering gear assembly	EPS warning light: Does not come on	After the CAN communication returns to normal	-