DTC U029A-123: Lost Communication with EV Battery Pack Sensor Module: Description

The No. 1 battery voltage sensor detects the No. 1 EV battery conditions (voltage, current, and temperature) and battery cooling fan voltage, and sends the detected signals to the power management control ECU via serial communication.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
U029A	123	Power management control ECU cannot receive the signal from the No. 1 battery voltage sensor (1 trip detection)	Wire harness or connector Power management control ECU Electric vehicle battery assembly (No. 1 battery voltage sensor)