DTC U0073: Control Module Communication Bus OFF; DTC U0124: Lost Communication with Lateral Acceleration Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0293: Lost Communication With Hybrid Vehicle Control System [10/2017 - 10/2020]: Description

The parking brake ECU assembly communicates with the skid control ECU assembly, deceleration sensor (yaw rate sensor) and hybrid vehicle control ECU assembly via CAN communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
U0073	Control Module Communication Bus OFF	Diagnosis Condition: Power switch on (IG) Malfunction Status: Bus OFF (cannot communicate with other ECUs) Malfunction Duration: 2 seconds (differs according to communication timing)	CAN communication system	Yes	An electric parking brake system malfunction is displayed on the multi-information display.
U0124	Lost Communication with Lateral Acceleration Sensor Module	Diagnosis Condition: Power switch on (IG) and vehicle driven at 7 km/h (9 mph) or more Malfunction Status: Parking brake ECU assembly unable to receive signals from the deceleration sensor (yaw rate sensor) Malfunction Duration: Approximately 1 second	CAN communication system Deceleration sensor (Yaw rate sensor)	Yes	An electric parking brake system malfunction is displayed on the multi-information display.
U0129	Lost Communication with Brake System Control Module	Diagnosis Condition: Power switch on (IG) Malfunction Status: Parking brake ECU assembly cannot receive signals from skid control ECU assembly Malfunction Duration: Approximately 1 second or approximately 10 seconds (duration differs according to signal)	CAN communication system Skid control ECU assembly	Yes	An electric parking brake system malfunction is displayed on the multi-information display.
U0293	Lost Communication With Hybrid Vehicle Control System	With the power switch on (IG) and the vehicle being driven at 15 km/h (9 mph) or more, the parking brake ECU assembly cannot receive signals from the hybrid vehicle control ECU assembly for approximately 1 second or 10 seconds (malfunction duration differs depending on the signal).	CAN communication system Hybrid vehicle control ECU assembly	Yes	An electric parking brake system malfunction is displayed on the multi-information display.