Engine-Codes.com
Engine-Codes – Mercedes-Benz – P0571 Mercedes-Benz

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

Quick Answer

The P0571 code for Mercedes-Benz indicates a Cruise Control/Brake Switch 'A' Circuit Malfunction. Common causes include Faulty brake switch, Wiring issues or shorts in the circuit, Malfunctioning cruise control module. 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, Wiring issues or shorts in the circuit, Malfunctioning cruise control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0571 Mercedes-Benz Description

The P0571 code for Mercedes-Benz indicates a Cruise Control/Brake Switch 'A' Circuit Malfunction. This code specifically refers to an issue with the cruise control system's ability to communicate with the brake switch circuit. The brake switch is a crucial component that sends a signal to the vehicle's control modules when the brake pedal is depressed, allowing the cruise control system to disengage. When this communication is disrupted, it can lead to various performance issues and safety concerns.

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

Common Causes of P0571 Mercedes-Benz

  1. Faulty brake switch.
  2. Wiring issues or shorts in the circuit.
  3. Malfunctioning cruise control module.
  4. Corrosion or damage to electrical connections.
  5. Software issues in the vehicle's control modules.

Symptoms of P0571 Mercedes-Benz

  1. Inability to engage or disengage cruise control.
  2. Erratic speed control while using cruise control.
  3. Limp mode activation.
  4. Warning lights on the dashboard related to cruise control or brake system.

How to Fix P0571 Mercedes-Benz

  1. Begin by diagnosing the specific cause of the P0571 code using a diagnostic scanner to pinpoint the exact issue.
  2. Inspect the brake switch and its wiring for any signs of damage, corrosion, or wear. Replace the brake switch if necessary.
  3. Check the cruise control module and related components for faults or malfunctions. Repair or replace as needed.
  4. Clear the code from the vehicle's computer system and test the cruise control functionality to ensure the issue has been resolved.
  5. Perform a final inspection to confirm that all connections are secure and functioning correctly before returning the vehicle to normal operation.

Cost to Fix P0571 Mercedes-Benz

The typical repair costs for addressing a P0571 code in a Mercedes-Benz can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates can vary between auto repair shops, so individuals should consult with their local service providers for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable options.

When is the Code Detected?

The P0571 codes is set when the stop light switch does not turn off even once the vehicle is driven.

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.

Discuss the causes and fixes for P0571 Mercedes-Benz OBDII Code

Submit a New Comment

Code P0571 Mercedes-Benz comments

No comments found for this page.