DTC C1451-51: High Pressure Tube Air Bleeding Not Programmed [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.

If air bleeding has not been performed, the No. 1 skid control ECU (brake booster with master cylinder assembly) stores DTC C1451-51 to prevent the entry of air due to pump motor operation.

DTC C1451-51 is stored when Motor Deactivate is selected, the system will not return to normal until the air bleeding procedure is performed.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Note
C1451-51	High Pressure Tube Air Bleeding Not Programmed	Either of the following is detected: Using the GTS, "Motor Deactivate" of the "ECB Utility" has been performed. The brake booster with master cylinder assembly has been replaced.	Air bleeding not performed	Does not come on	Brake Booster	Output ECU: No. 1 skid control ECU (brake booster with master cylinder assembly) HINT: The DTC is cleared when the conditions return to normal. ECB: Electronically Controlled Brake System

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Note

C1451-51

High Pressure Tube Air Bleeding Not Programmed

Either of the following is detected:

Using the GTS, "Motor Deactivate" of the "ECB Utility" has been performed.
The brake booster with master cylinder assembly has been replaced.

Air bleeding not performed

Does not come on

Brake Booster

Output ECU: No. 1 skid control ECU (brake booster with master cylinder assembly)

HINT:

The DTC is cleared when the conditions return to normal.
ECB: Electronically Controlled Brake System