DTC C1349: Pressure Holding Solenoid Valve Learning Undone; DTC C134A: Pressure Holding Solenoid Valve Learning Malfunction [10/2018 - ]: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus UX 250h, 2023 Lexus UX 250h, 2022 Lexus UX 250h, 2021 Lexus UX 250h, and 2020 Lexus UX 250h. 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) stores the individual characteristic of each holding solenoid built into the brake actuator assembly. Based on the stored information, the skid control ECU (brake booster with master cylinder assembly) calibrates the individual differences and controls systems.

The skid control ECU (brake booster with master cylinder assembly) receives the shift position P signal from the hybrid vehicle control ECU through the CAN communication system.

These DTCs are cleared when the ABS holding solenoid valve learning results are normal.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1349	Pressure Holding Solenoid Valve Learning Undone	1155	The ABS holding solenoid valve learning value is not stored.	Perform ABS holding solenoid valve learning and check for DTCs. If no DTCs are output again, the valve is normal.	Only DTC C1349 (INF code 1155) is stored: Does not come on SAE Code C1349 is stored: Comes on	INF Code 1155: SAE Code C1349 Electronically controlled brake system DTC
C134A	Pressure Holding Solenoid Valve Learning Malfunction	1156	The ABS holding solenoid valve learning value cannot be obtained.	Perform ABS holding solenoid valve learning and check for DTCs. If no DTCs are output again, the valve is normal. Skid control ECU (brake booster with master cylinder assembly) Brake actuator assembly	Does not come on	Electronically controlled brake system DTC