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 [08/2019 - ]: Description

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The 4WD ECU assembly receives signals from the ECM, skid control ECU (brake actuator assembly) and steering sensor via CAN communication.

When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U0100	Lost Communication with ECM / PCM "A"	When both of the following continue for 2 seconds or more: The IG 1 terminal voltage is 10 V or more. At a vehicle speed of 60 km/h (38 mph) or more, communication with the ECM cannot be performed.	CAN communication system 4WD ECU assembly ECM
U0126	Lost Communication with Steering Angle Sensor Module	When both of the following continue for 1 second or more: The IG 1 terminal voltage is 10 V or more. Communication with the steering sensor cannot be performed. When all of the following occur 10 times consecutively: The IG 1 terminal voltage is 10 V or more. A communication malfunction with the steering sensor occurs once within 5 seconds, 10 times or more within 60 seconds.	CAN communication system 4WD ECU assembly Steering sensor
U0129	Lost Communication with Brake System Control Module	When the following continues for 3 seconds or more: The IG 1 terminal voltage is 10 V or more. Communication with the skid control ECU (brake actuator assembly) cannot be performed.	CAN communication system 4WD ECU assembly Skid control ECU (Brake actuator assembly)