DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0122: Lost Communication with Vehicle Dynamics Control Module; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U1104: Lost Communication with Driving Support ECU [08/2015 - ]: Description

The ECM communicates several signals with each sensor and ECU via CAN communication.

If there are any malfunctions in the communication circuit, one or more CAN communication system DTCs are stored.

DTC No.	U0100	DTC Detection Condition	Trouble Area
U0100	Lost Communication with ECM / PCM "A"	(Condition 1) While the dynamic radar cruise control is either preparing for operation or operating, the ECM continuously receives a communication cut-off signal from the driving support ECU assembly for more than a certain amount of time, the ECM stores this DTC. (Condition 2) While the dynamic radar cruise control is either preparing for operation or operating, the ECM continuously receives a communication cut-off signal from the skid control ECU (brake actuator assembly) for a certain amount of time, the ECM stores this DTC.	(Condition 1) Communication circuit ECM Driving support ECU assembly (Condition 2) Communication circuit ECM Skid control ECU (brake actuator assembly)
U0122	Lost Communication with Vehicle Dynamics Control Module	While dynamic radar cruise control is either preparing for operation or operating, communication data from the skid control ECU (brake actuator assembly) is invalid for a certain amount of time, the ECM stores this DTC.	Communication circuit Skid control ECU (brake actuator assembly) ECM
U0123	Lost Communication with Yaw Rate Sensor Module	While the dynamic radar cruise control is either preparing for operation or operating, the ECM continuously receives a yaw rate sensor malfunction signal for a certain amount of time.	Communication circuit Airbag senor assembly (yaw rate sensor) Driving support ECU assembly ECM
U0126	Lost Communication with Steering Angle Sensor Module	While the dynamic radar cruise control is either preparing for operation or operating, the ECM continuously receives a steering sensor communication error signal for a certain amount of time, the driving support ECU assembly sends a signal to the ECM and the ECM stores this DTC.	Communication circuit Steering angle sensor Driving support ECU assembly ECM
U1104	Lost Communication with Driving Support ECU	While dynamic radar cruise control is either preparing for operation or operating and engine switch is on (IG), communication between driving support ECU assembly and front millimeter wave radar sensor assembly, ECM or skid control ECU (brake actuator assembly) stops for 1 second or more.	Driving support ECU assembly Communication circuit Millimeter wave radar sensor assembly ECM Skid control ECU (brake actuator assembly)