DTC C1391/69: Accumulator Leak Malfunction [08/2013 - ]: Description

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

This DTC is stored if internal or external brake fluid leaks are detected due to improper sealing in the brake actuator (brake booster with master cylinder assembly) or brake booster pump assembly. Internal leaks are suspected if the pump motor operates frequently without braking.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
C1391/69	351	Either of the following is detected: Accumulator pressure sensor input does not increase before braking or while the pump motor is operating. Accumulator pressure sensor input reduction rate exceeds the specification before braking and while the pump motor is not operating.	Brake fluid leaks Brake actuator (Brake booster with master cylinder assembly) (Malfunctioning internal seal, low gas pressure in accumulator, etc.)