AutoCodes – Generic – P0724

P0724 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 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 21,085

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

What does this mean?

What are the Possible Causes of the DTC P0724?

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?

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 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.

Need more information about the P0724 code?

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Information for Specific Makes

P0724 Acura — Brake Switch 'B' Circuit High
P0724 Audi — Brake Switch 'B' Circuit High
P0724 Buick — Brake Switch Circuit High Input
P0724 Cadillac — Brake Switch Circuit High Input
P0724 Chevrolet — Brake Switch Circuit High Input
P0724 GMC — Brake Switch Circuit High Input
P0724 Honda — Brake Switch 'B' Circuit High
P0724 Isuzu — Brake Switch Circuit Fault
P0724 Lexus — Brake Switch 'B' Circuit High
P0724 Mazda — Brake Switch 'B' Circuit High
P0724 Mercedes-Benz — Brake Switch 'B' Circuit High
P0724 Pontiac — Brake Switch Circuit High Input
P0724 Saturn — Brake Switch Circuit High Input
P0724 Scion — Brake Switch 'B' Circuit High
P0724 Subaru — Torque Converter Brake Switch 'B' Circuit High
P0724 Toyota — Brake Switch 'B' Circuit High
P0724 Volkswagen — Brake Switch 'B' Circuit High

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.