DTC B277A-96: Wireless Starter Component Internal Failure [10/2022 - ]: Description

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

If the remote engine start ECU*1 or DCM (telematics transceiver)*2 does not respond to the certification ECU (smart key ECU assembly) or the remote engine start ID is not registered, this DTC is stored.

HINT:

Registration status of the DCM (telematics transceiver) ID can be checked using the "Remote Engine Starter Registration Status" item in the Data List.*2

*1: w/ Genuine Remote Engine Start
*2: for Remote Connect Compatible Type

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority	Note
B277A-96	Wireless Starter Component Internal Failure	One of the following conditions is met (1 trip detection logic*3): A remote start communication error occurs. Response is not possible. Registration has not been performed.	CAN communication system Remote engine start ECU1 DCM (telematics transceiver)2 Certification ECU (smart key ECU assembly)	Smart Access	A	DTC output confirmation operation: A remote start operation is performed.

*1: w/ Genuine Remote Engine Start
*2: for Remote Connect Compatible Type
*3: Only output while a malfunction is present.

VEHICLE CONDITION AND FAIL-SAFE OPERATION WHEN MALFUNCTION DETECTED

Vehicle Condition when Malfunction Detected	Fail-safe Operation when Malfunction Detected
Engine does not start with remote start operation	Engine cannot be started by remote start operation only

RELATED DATA LIST AND ACTIVE TEST

DTC No.	Data List and Active Test
B277A-96	Telematics Remote Engine Starter Registration Status*

*: for Remote Connect Compatible Type