AutoCodes – Mercedes-Benz – P0571 Mercedes-Benz

P0571 Mercedes-Benz Code - Cruise Control/Brake Switch 'A' Circuit Malfunction

Quick Answer

When the brake pedal is depressed, the stop light switch sends a signal to the Engine Control Module (ECM). Common causes include Faulty Brake Switch, Misadjusted brake switch, Brake Switch harness is open or shorted. 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: P0571 Mercedes-Benz indicates Cruise Control/Brake Switch 'A' Circuit Malfunction.
Common causes: Common causes include Faulty Brake Switch, Misadjusted brake switch, Brake Switch harness is open or shorted.
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 4,230

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 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 P0571 Mercedes-Benz Description

When the brake pedal is depressed, the stop light switch sends a signal to the Engine Control Module (ECM). When the ECM receives this signal, it cancels the cruise control.

OBDII Code P0571 Mercedes-Benz - Cruise Control/Brake Switch 'A' Circuit Malfunction - AutoCodes.com — P0571 Mercedes-Benz Code - Cruise Control/Brake Switch 'A' Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0571 Mercedes-Benz?

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

How to Fix the DTC P0571 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 P0571 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 P0571 Mercedes-Benz code?

Need more information on how to fix the P0571 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0571 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 P0571 Mercedes-Benz Code

1. What does the OBDII code P0571 mean for a Mercedes-Benz?

P0571 indicates a malfunction in the Cruise Control/Brake Switch 'A' circuit, which affects the vehicle's cruise control and brake light systems.

2. What are the common symptoms of the P0571 code in a Mercedes-Benz?

Symptoms may include non-functional cruise control, illuminated brake lights, the brake lights staying on constantly, and the Check Engine Light or other warning lights on the dashboard.

3. What causes the P0571 code to appear in a Mercedes-Benz?

Possible causes include a faulty brake light switch, damaged wiring or connectors in the brake switch circuit, or a blown fuse related to the brake light system.

4. Can I still drive my Mercedes-Benz with the P0571 code active?

While the car may still be drivable, malfunctioning brake lights or cruise control could pose a safety risk. It's best to address the issue promptly.

5. How is the P0571 code diagnosed in a Mercedes-Benz?

A technician will use a scan tool to check for codes, inspect the brake switch and its wiring, and test the circuit for proper voltage and continuity.

6. How do I fix the P0571 code on my Mercedes-Benz?

Common fixes include replacing the faulty brake light switch, repairing damaged wiring or connectors, and ensuring fuses related to the system are intact.

7. How much does it cost to repair a P0571 code in a Mercedes-Benz?

Repair costs can range from $50 to $200 or more, depending on whether the issue is a simple brake switch replacement or involves more extensive wiring repairs.

8. Can a faulty brake light switch cause other issues besides the P0571 code?

Yes, a faulty brake light switch can also cause problems with ABS, traction control, and the electronic stability program (ESP) systems in your Mercedes-Benz.

9. How can I prevent the P0571 code from recurring in my Mercedes-Benz?

Regular maintenance, including inspecting the brake light switch and its wiring, can help prevent this issue. Avoid harsh driving conditions that might damage electrical components.

10. Does the P0571 code always require professional repair for a Mercedes-Benz?

If you're comfortable with basic car repairs, you might be able to replace the brake light switch yourself. However, diagnosing wiring issues is best left to a professional.