Dtc C139A-00: Brake Pressure Control Solenoid Circuit Malfunction; Dtc C13D9-00: Brake Pressure Too Low (Brake Booster); Dtc C14Ec-7E: Brake Pressure Control Solenoid "C" Actuator Stuck On [11/2021 - ]: 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) Controls The Brake Fluid Pressure Of The Master Cylinder Based On The Output Of The Brake Fluid Pressure Sensor.

DTCS May Be Stored If One Of The Following Occurs:

Brake Fluid Leaks.
Foreign Matter Enters A Solenoid Valve.
Line Pressure Drops During Air Bleeding.
Brake Pads Are Replaced.
Rotors Are Replaced.

Hint:

Brake Pressure Control Solenoid "C": Solenoid Sla

Dtc No.	Detection Item	Dtc Detection Condition	Trouble Area	Mil	Dtc Output From	Note
C139A-00	Brake Pressure Control Solenoid Circuit Malfunction	When All Of The Following Conditions Are Met, There Is A Malfunction In One Of The Two Circuits (Leakage, Etc.). The Vehicle Was Driven Before The Ignition Switch Was Turned Off. 90 Seconds Have Elapsed Since The Ignition Switch Was Turned Off. The Vehicle Is Stopped And The Shift State Is Park (P).	Brake Fluid Leaks Wire Harness And Connector Brake Booster With Master Cylinder Assembly	Does Not Come On	Brake Booster	Output ECU: No. 1 Skid Control ECU (Brake Booster With Master Cylinder Assembly)
C13D9-00	Brake Pressure Too Low (Brake Booster)	Fluid Pressure Control Performance Degraded (Pressure Excessively Low)	Brake Fluid Leaks Wire Harness And Connector Brake Booster With Master Cylinder Assembly	Does Not Come On	Brake Booster	Output ECU: No. 1 Skid Control ECU (Brake Booster With Master Cylinder Assembly)
C14Ec-7E	Brake Pressure Control Solenoid "C" Actuator Stuck On	Sla Valve Malfunction (Stuck Closed, Etc.)	Brake Fluid Leaks Wire Harness And Connector Brake Booster With Master Cylinder Assembly	Does Not Come On	Brake Booster	Output ECU: No. 1 Skid Control ECU (Brake Booster With Master Cylinder Assembly)