DTC C0594-00: Brake Booster Motor "A" Performance [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.

The No. 1 skid control ECU (brake booster with master cylinder assembly) detects decreases in the accumulator pressure according to the data from the accumulator pressure sensor, and then starts and stops the pump motor by operating the motor relay.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Note
C0594-00	Brake Booster Motor "A" Performance	The pump motor is operating continuously for 178 seconds or more.	Accumulator pressure sensor malfunction Wire harness and connector Brake booster with accumulator pump assembly Foreign matter enters SLA solenoid valve No. 1 skid control ECU (brake booster with master cylinder assembly)	Comes on	Brake/EPB	SAE Code: C0594 Output ECU: Both skid control ECUs