DTC B2456: Left Headlight ECU Variation Error [09/2020 - 11/2021]: Description

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2024 Lexus IS 500, 2024 Lexus IS 350, 2024 Lexus IS 300, 2023 Lexus IS 500, and 2023 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

This DTC is stored if the headlight ECU sub-assembly LH for another destination is installed.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
B2456	Left Headlight ECU Variation Error	Detection condition: The engine switch is on (IG). Malfunction status: Vehicle specification information received via CAN communication is continuously mismatched Malfunction duration: -	ECM Main body ECU (multiplex network body ECU) Headlight ECU sub-assembly LH	HL AutoLeveling

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2456

Left Headlight ECU Variation Error

Detection condition:

The engine switch is on (IG).

Malfunction status:

Vehicle specification information received via CAN communication is continuously mismatched

Malfunction duration:

ECM
Main body ECU (multiplex network body ECU)
Headlight ECU sub-assembly LH

HL AutoLeveling