Monitor Description

WARNING: This page is about a different car, the 2025 Lexus RX 450h+, 2025 Lexus RX 350h, 2024 Lexus RX 450h+, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.

The ECM and battery energy control module send and receive signals via CAN communication.

If a communication error occurs between the ECM and battery energy control module, the ECM illuminates the MIL and stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
U0111-87	Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message	All of the following conditions are met for 50.6 seconds or more (1 trip detection logic): Ignition switch ON Auxiliary battery voltage is 10 V or higher No communication between ECM and battery energy control module	CAN communication system Battery energy control module ECM	Comes on	Engine	B	SAE Code: U0111 DTC for Mexico Models: Does not apply