How to Fix P0779 Pressure Control Solenoid B Malfunction

Introduction

If you’re experiencing issues with your car’s transmission, specifically the P0779 code, you may be wondering what to do next. The P0779 code indicates a problem with the pressure control solenoid B circuit, which can cause a variety of transmission issues. Fortunately, with a little bit of knowledge and some basic tools, you can fix this problem yourself.

Step 1: Diagnose the Problem

Before you can fix the problem, you need to diagnose it. The P0779 code can be caused by a variety of issues, including a faulty pressure control solenoid, a damaged wiring harness, or a malfunctioning transmission control module. To diagnose the problem, you’ll need an OBD-II scanner. Connect the scanner to your car’s OBD-II port and read the code. If the code is P0779, you can be sure that the problem is related to the pressure control solenoid B circuit.

Step 2: Replace the Pressure Control Solenoid

Once you’ve diagnosed the problem, it’s time to fix it. The most common cause of the P0779 code is a faulty pressure control solenoid. To replace the solenoid, you’ll need to locate it on your transmission. The pressure control solenoid is typically located on the valve body, which is located inside the transmission. You’ll need to remove the transmission pan and filter to access the valve body.

Once you’ve located the pressure control solenoid, remove it from the valve body. Install the new solenoid in its place, making sure to connect the wiring harness properly. Reinstall the transmission pan and filter, and refill the transmission with fluid.

Step 3: Check the Wiring Harness

If replacing the pressure control solenoid doesn’t fix the problem, the issue may be with the wiring harness. Check the wiring harness for any damage or corrosion. If you find any damage, repair or replace the affected wires.

Step 4: Check the Transmission Control Module

If the wiring harness is in good condition, the problem may be with the transmission control module. The transmission control module is responsible for controlling the transmission’s shifting and other functions. If the module is malfunctioning, it can cause a variety of transmission issues, including the P0779 code.

To check the transmission control module, you’ll need to use a scan tool that can communicate with the module. Connect the scan tool to the OBD-II port and follow the manufacturer’s instructions to communicate with the module. If the module is malfunctioning, you’ll need to replace it.

Conclusion

Fixing the P0779 code may seem daunting, but with a little bit of knowledge and some basic tools, you can do it yourself. By following these steps, you can diagnose and fix the problem, saving yourself time and money.

FAQs

1. Can I drive my car with the P0779 code?

It’s not recommended to drive your car with the P0779 code. The code indicates a problem with the transmission, which can cause further damage if left untreated.

2. How much does it cost to fix the P0779 code?

The cost to fix the P0779 code can vary depending on the cause of the problem. Replacing the pressure control solenoid is typically the least expensive option, while replacing the transmission control module can be more costly.

3. Can I fix the P0779 code myself?

Yes, you can fix the P0779 code yourself if you have some basic knowledge and tools. However, if you’re not comfortable working on your car’s transmission, it’s best to take it to a professional mechanic.