DTC C1214: Hydraulic Control System Malfunction [06/2018 - 07/2019]: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

The skid control ECU (brake booster with master cylinder assembly) controls braking force according to the hybrid control system regenerative braking force and provides the hydraulic pressure necessary for operating the master cylinder and each wheel cylinder according to the servo pressure sensor.

DTCs may be stored if one of the following occurs:

Brake fluid leaks.
Wheel cylinder vibrates due to uneven wear of a brake disc.
Foreign matter enters a solenoid valve.
Line pressure drops during air bleeding.
Brake pads are replaced.
Rotors are replaced.
HINT:

When replacing the brake pads, retracting the brake caliper pistons and installing new brake pads will greatly increase the clearance between the brake pads and brake discs. This will result in a significant possibility of this DTC being stored the next time the brake pedal is depressed. As this is not a malfunction, clear the DTC if it is stored for this reason.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1214	Hydraulic Control System Malfunction	431 432 436 438 440 441 442	INF Code: 431 Fluid pressure control performance degraded (high pressure). INF Code: 432 Fluid pressure control performance degraded (low pressure). INF Code: 436 SLA valve malfunction (stuck, etc.). INF Code: 438 Malfunction in one of the two circuits (leakage, etc.). INF Code: 440 SSA valve malfunction (stuck, etc.). INF Code: 441 SGH valve malfunction (stuck, etc.). INF Code: 442 Malfunction (leakage, etc.) detected in the ABS decrease pressure valve in the brake actuator assembly.	INF Code: 431, 432, 436, 438, 440, 441 Brake fluid leaks Uneven brake disc rotor wear Brake actuator (brake booster with master cylinder assembly) INF Code: 442 Brake actuator assembly	Comes on	INF Code 431: SAE Code C13CD INF Code 432: SAE Code C13CE INF Code 436: SAE Code C139D INF Code 438: SAE Code C139A INF Code 440: SAE Code C14EE INF Code 441: SAE Code C14F7 INF Code 442: SAE Code C1400 Electronically controlled brake system DTC