AutoCodes – Mercedes-Benz – P0724 Mercedes-Benz

P0724 Mercedes-Benz Code - Brake Switch 'B' Circuit High

Quick Answer

This brake switch send a signal to the Engine Control Module (ECM). Common causes include Faulty Brake 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 Mercedes-Benz indicates Brake Switch 'B' Circuit High.
Common causes: Common causes include Faulty Brake 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 2,716

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0724 Mercedes-Benz Description

This brake switch send a signal to the Engine Control Module (ECM). The signal is used to detect when the brakes have been applied. In some models the brake switch signal voltage is the same as the voltage supplied to the stop lights.

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

What does this mean?

What are the Possible Causes of the DTC P0724 Mercedes-Benz?

Faulty Brake Switch
Brake Switch harness is open or shorted
Brake Switch circuit poor electrical connection
Misadjusted Brake Switch

How to Fix the DTC P0724 Mercedes-Benz?

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 Mercedes-Benz 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 Mercedes-Benz code?

Need more information on how to fix the P0724 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0724 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

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.

Frequently Asked Questions about P0724 Mercedes-Benz Code

1. What does the OBDII code P0724 mean on a Mercedes-Benz?

P0724 indicates a problem with the Brake Switch 'B' Circuit, specifically a high voltage condition, which may affect vehicle safety and transmission operation.

2. What are the common symptoms of code P0724 in a Mercedes-Benz?

Symptoms may include the brake lights staying on or not working, issues with the cruise control, or the transmission being stuck in gear or shifting irregularly.

3. What causes the P0724 code in a Mercedes-Benz?

Potential causes include a faulty brake light switch, damaged wiring or connectors in the brake switch circuit, or a malfunctioning ECM (Engine Control Module).

4. Can I drive my Mercedes-Benz with a P0724 code?

Driving with this code is not recommended as it can affect critical safety systems like brake lights and cruise control, posing a safety risk.

5. How is the P0724 code diagnosed in a Mercedes-Benz?

A technician will use a scan tool to read the code, inspect the brake light switch and its wiring, and test for proper voltage and continuity in the circuit.

6. How do I fix the P0724 code on my Mercedes-Benz?

Common fixes include replacing the faulty brake light switch, repairing damaged wiring or connectors, or updating the ECM software if necessary.

7. What tools do I need to repair a P0724 code?

You may need a diagnostic scan tool, a multimeter for electrical testing, and basic hand tools to access and replace the brake light switch.

8. How much does it cost to fix the P0724 code on a Mercedes-Benz?

Repair costs can range from $50 to $200 depending on whether the brake light switch or wiring needs replacement, and labor charges vary by location.

9. Can a faulty brake light switch cause transmission problems in a Mercedes-Benz?

Yes, a faulty brake light switch can send incorrect signals to the ECM, potentially causing transmission shifting issues or preventing the car from shifting out of park.

10. Will clearing the P0724 code fix the problem?

Clearing the code will temporarily remove it, but if the underlying issue isnâ€™t repaired, the code will return. Proper diagnosis and repair are necessary.