How to Solve Error P0725: Torque Converter/Brake Switch B Circuit High

Are you experiencing issues with your car and a diagnostic scan revealed the error code P0725? Don’t worry, we’ve got you covered.

In this article, we will delve into the details of the Torque Converter/Brake Switch B Circuit High error code and provide you with a comprehensive guide on how to solve it. So, let’s get started and get your car back on track!

Understanding Torque Converter/Brake Switch B Circuit High:

The Torque Converter/Brake Switch B Circuit High error code, also known as P0725, indicates a problem with the circuit responsible for transmitting signals between the torque converter clutch solenoid and the brake switch.

This error code usually occurs in automatic transmission vehicles. When the circuit experiences a high voltage condition, the vehicle’s control module detects it and triggers the P0725 error code.

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Causes of P0725:

There are several potential causes for the Torque Converter/Brake Switch B Circuit High error code. Some common factors include:

  1. Faulty brake switch: A malfunctioning brake switch can disrupt the communication between the torque converter clutch solenoid and the vehicle’s control module.
  2. Wiring issues: Damaged or loose wiring connections can lead to a high voltage condition in the circuit, triggering the error code.
  3. Defective torque converter clutch solenoid: If the solenoid responsible for controlling the torque converter clutch is faulty, it can cause the circuit to experience high voltage.

Symptoms of P0725:

Identifying the symptoms associated with the P0725 error code can help you address the issue promptly. Look out for the following indicators:

  1. Illuminated Check Engine Light (CEL): The most obvious sign of the P0725 error code is the activation of the CEL on your vehicle’s dashboard.
  2. Transmission issues: You may experience problems with the shifting of gears, such as delayed or rough shifting.
  3. Stalling or poor acceleration: The error code can result in stalling or a noticeable decrease in acceleration power.

Diagnostic Process:

To diagnose the P0725 error code accurately, follow these steps:

  1. Use an OBD-II scanner: Connect an OBD-II scanner to your car’s diagnostic port and retrieve the error code information.
  2. Inspect the brake switch: Check the brake switch for any signs of damage or malfunction. Replace it if necessary.
  3. Examine the wiring connections: Inspect the wiring connections associated with the torque converter clutch solenoid and the brake switch. Look for any loose or damaged wires.
  4. Test the torque converter clutch solenoid: Use a multimeter to measure the resistance across the solenoid terminals. If the resistance is out of the specified range, the solenoid may need replacement.

Troubleshooting and Repair:

Once you have diagnosed the P0725 error code, follow these steps to troubleshoot and repair the issue:

  1. Replace the brake switch: If the brake switch is faulty, replace it with a new one. Ensure proper installation and secure the wiring connections.
  2. Repair or replace damaged wiring: In case you find any damaged or loose wires, repair or replace them as necessary. Properly secure the connections.
  3. Replace the torque converter clutch solenoid: If the solenoid is defective, remove the old one and install a new torque converter clutch solenoid. Follow the manufacturer’s instructions for proper installation.

Prevention and Maintenance:

To prevent the recurrence of the P0725 error code, consider these preventive measures:

  1. Regular maintenance: Adhere to the recommended maintenance schedule for your vehicle, including periodic checks of the transmission system.
  2. Careful handling of electrical components: Be cautious when working with electrical components in your car to avoid damaging the wiring or connectors.


The Torque Converter/Brake Switch B Circuit High error code, or P0725, can cause transmission issues and hinder your driving experience. However, by following the diagnostic process, troubleshooting steps, and preventive measures outlined in this article, you can resolve the issue effectively. Remember to prioritize safety during the repair process and consult a professional if needed. With the right approach, you can get your car back on the road smoothly.

FAQs (Frequently Asked Questions)

Can I continue driving my car with the P0725 error code?

  1. It is recommended to address the P0725 error code as soon as possible to avoid further damage to the transmission system. Consider seeking professional assistance to resolve the issue promptly.

Can a DIY enthusiast fix the P0725 error code?

  1. Yes, a DIY enthusiast with a basic understanding of automotive systems can attempt to fix the P0725 error code. However, it’s essential to follow the diagnostic and repair steps carefully to ensure a successful resolution.

What should I do if the error code persists after troubleshooting and repair?

  1. If the P0725 error code persists even after following the diagnostic and repair procedures, it is advisable to consult a qualified mechanic or a dealership to assess and resolve the issue accurately. They have the necessary expertise and specialized equipment to handle complex transmission-related problems.