AutoCodes – Lexus – P0724 Lexus

P0724 Lexus Code - Brake Switch 'B' Circuit High

Quick Answer

The stop light switch is part of a duplex system that transmits two signals: STP and ST1-. Common causes include Faulty Brake Switch (Stop Light Switch), Brake Switch harness is open or shorted, Brake Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0724 Lexus indicates Brake Switch 'B' Circuit High.
Common causes: Common causes include Faulty Brake Switch (Stop Light Switch), Brake Switch harness is open or shorted, Brake Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,997

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 11, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0724 Lexus Description

The stop light switch is part of a duplex system that transmits two signals: STP and ST1-. These two signals are used by the Engine Control Module (ECM) to monitor whether or not the brake system is working properly. This Diagnostic Trouble Code (DTC) indicates that the stop light switch assembly remains on. When the stop light switch assembly remains on during STOP and GO driving, the ECM interprets this as a fault in the stop light switch assembly. Then the ECM illuminates the MIL and stores the DTC.

OBDII Code P0724 Lexus - Brake Switch 'B' Circuit High - AutoCodes.com — P0724 Lexus Code - Brake Switch 'B' Circuit High

What does this mean?

What are the Possible Causes of the DTC P0724 Lexus?

Faulty Brake Switch (Stop Light Switch)
Brake Switch harness is open or shorted
Brake Switch circuit poor electrical connection
Misadjusted Brake Switch
Faulty Engine Control Module (ECM)

How to Fix the DTC P0724 Lexus?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0724 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.