DTC C124A-05: Braking System information System Programming Failure [11/2021 - 03/2024]: Description

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Note
C124A-05	Braking System information System Programming Failure	When the vehicle speed is 40 km/h (25 mph) or more, one of the following conditions is met: The engine type, powertrain variation and destination information sent from the hybrid vehicle control ECU do not match the information stored in the No. 2 skid control ECU (brake actuator assembly). No system information stored in the No. 2 skid control ECU (brake actuator assembly).	Incorrect hybrid vehicle control ECU installed No. 2 skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C124A Output ECU: No. 2 skid control ECU (brake actuator assembly)