How to Diagnose and Fix the P0571 Code

In the field of automobile fault diagnosis, the P0571 code is a common DTC (diagnostic fault code), which indicates a fault in the brake switch A circuit. This code not only troubles many car owners but also is one of the challenges that automobile maintenance personnel often face. This article will analyze the meaning, possible causes, common symptoms, triggering models, severity, diagnostic methods, repair strategies, and preventive measures of the P0571 code in detail, and interspersed with specific data and cases to help car owners and maintenance personnel better understand and deal with this problem.

1. What does the P0571 code mean? 

The P0571 code is an OBD-II (second-generation on-board diagnostic system) fault code that indicates that there is a fault in the brake switch A circuit. Among them, "P" stands for the powertrain system, and "0571" is the specific fault code. The P0571 is a fault in the brake switch A circuit, which may affect the vehicle's cruise control, torque converter separation, and other functions. As for the specific meaning of each number, they usually follow specific coding rules, but the specific interpretation may vary from manufacturer to manufacturer.

2. What are the possible causes of the P0571 code?

The occurrence of the P0571 code is usually related to problems with the brake switch, related circuits or connectors. Possible causes include:

• The internal components of the brake switch are damaged or have poor contact.
• The brake switch circuit is open or shorted.
• The brake switch connector is loose or corroded.
• The electronic control unit (ECU) receives an unreliable signal from the brake switch (less common).

3. What are the common symptoms of the P0571 code?

When the vehicle has the P0571 code, it may be accompanied by the following symptoms:

• The cruise control function fails.
• The torque converter cannot be properly disengaged.
• The brake lights may not light up or flash.
• The instrument panel displays the relevant fault warning light.
• The vehicle may have poor acceleration or a failure of the brake override function.

4. Which vehicles can trigger the P0571 code?

The P0571 code is a fault code that applies widely to various car manufacturers. This code may be triggered by vehicles of different makes and models, including but not limited to Dodge, Jeep, Duramax, Chrysler, Audi, Chevrolet, Toyota, Ford, Mazda, Volkswagen, and Volvo. Different models may show different symptoms due to design differences.

5. How serious is the P0571 code?

The severity of the P0571 code depends on its root cause. If the problem originates from the brake switch or related circuits, it may affect the vehicle's braking performance and cruise control function, thereby increasing driving risks. Therefore, once this code is discovered, it should be diagnosed and repaired in time.

6. Can I still drive after the P0571 code appears?

Although the vehicle may still be able to drive after the P0571 code appears, it is recommended that the owner does not risk driving before repair. Because the cruise control function may fail and the brake system may have hidden dangers, this will increase the risk of driving.

7. How to diagnose the P0571 code?

Diagnosing the P0571 code usually requires a professional auto repair technician to use a fault diagnostic tool for in-depth inspection. Here are the general diagnostic steps:

• Use iCarsoft OBD2 diagnostic tool to read and confirm the presence of the P0571 code.
• Check whether the brake switch is damaged or has poor contact.
• Check whether the brake switch wiring and connectors are loose, open, or corroded.
• Use a multimeter to test whether the circuit is conducting normally.
• Check whether there is a software glitch or other problem with the ECU (rare).

8. Common mistakes when diagnosing the P0571 code

Common mistakes when diagnosing the P0571 code include:

• Ignoring the inspection of the brake switch wiring and connector and only focusing on the brake switch itself.
• Misjudging it as an ECU failure, which is actually a rare ECU failure.
• Not thoroughly checking all possible fault points, resulting in the problem not being completely solved.

9. How to fix the P0571 code?

The method to fix the P0571 code depends on the specific cause of the fault. Possible repairs include:

• Replace a damaged brake switch.
• Repair or replace loose wiring and connectors.
• Clear the fault code and perform a system test to ensure the problem is resolved.
• If the ECU has a software fault (rare), perform a software update or restore the factory settings.

10. Difficulty of checking the P0571 code

The difficulty of checking the P0571 code varies depending on the vehicle brand and model. Some vehicles may be easier to diagnose because they have more advanced fault diagnosis systems and more accessible parts. However, for some models, especially older or imported models, it may take more time and expertise to accurately diagnose the problem.

11. How much does it cost to repair the P0571 code in the United States?

In the United States, the cost of repairing the P0571 code varies by region, repair shop, and specific cause of the fault. Generally speaking, if the problem stems from a brake switch or wiring fault, the repair cost may be around a few hundred dollars to a thousand dollars. However, if it involves repairing or replacing the ECU, the cost may be higher. The specific cost also needs to be determined by the repair shop's pricing and the economic level of the area.

12. How to clear the P0571 code?

After repairing the fault, the P0571 code should be cleared using a OBD2 diagnostic tool. Note that you should not disconnect the negative terminal of the battery at will to clear the fault code, as this may cause the vehicle control computer to lose its memory function, thus affecting the vehicle's performance. The correct approach is to use a fault diagnostic instrument to perform the clearing operation according to the manufacturer's instructions.

13. How to prevent the occurrence of the P0571 error code?

The prevention of the P0571 error code can be started from the following aspects:

• Regularly check the status of the brake switch and circuit to ensure that they are working properly.
• Avoid driving for long periods of time under adverse driving conditions to reduce wear on the brake system.
• Perform vehicle maintenance and inspections regularly to detect and repair potential problems in a timely manner.
• Pay attention to driving habits, avoid frequent sudden braking and long-term continuous use of functions such as cruise control.

14. Other notes on the P0571 code

When dealing with the P0571 code, be sure to follow the vehicle manufacturer's maintenance guidelines and operating procedures. If you cannot determine the cause of the fault or cannot repair the problem yourself, please seek professional car repair services in a timely manner. Remember, safety always comes first. Don't risk driving a vehicle with hidden dangers before repairing the fault. Some models may have specific maintenance precautions or special requirements. Please be sure to consult the relevant maintenance manual or consult professional maintenance personnel.

15.How to Choose a Diagnostic Tool?

When purchasing an OBD2 diagnostic tool, you should consider the following factors:

• Brand and quality: Choose a well-known brand and reliable quality products to ensure accuracy and reliability.
• Functional requirements: Choose an OBD2 scan tool with appropriate functions according to the vehicle model and repair needs. For example, some advanced tools may support more car models and more detailed diagnostic information.
• Budget: Choose a suitable OBD2 scan tool according to your budget. Prices vary depending on brand, function, and quality.
• User reviews: Check other users' reviews and feedback to understand the performance and ease of use of the product.

When purchasing an OBD2 scan tool, you can get more information and suggestions through Internet searches, car forums, or professional repair shops. Make sure the product you choose meets your needs and budget and can provide accurate diagnostic services for your vehicle.

Welcome to iCarsoft-US.com, your ultimate destination for cutting-edge automotive diagnostic tools and solutions! At iCarsoft-US.com, we pride ourselves on delivering high-quality, professional-grade products that empower both DIY enthusiasts and professional mechanics to take charge of their vehicle's health with confidence.

Our extensive range of diagnostic scanners, code readers, and specialty tools are designed to seamlessly integrate with a wide variety of vehicle makes and models, ensuring accurate, swift, and actionable insights into your car's performance and any potential issues. Whether you're looking to reset your oil service light, read and clear diagnostic trouble codes, or perform advanced troubleshooting, iCarsoft has got the perfect tool for you.

Learn More About iCarsoft Diagnostic Tools

In summary, the P0571 code is a fault diagnosis code involving the brake switch A circuit. It may be caused by a variety of reasons and accompanied by a series of symptoms. In order to ensure driving safety, the owner should diagnose and repair it in time. At the same time, by regularly checking and maintaining the vehicle, the occurrence of such faults can be effectively prevented.