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Engine-Codes – Generic – U179D

U179D Code - Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus

Quick Answer

The U179D diagnostic trouble code indicates that the vehicle's onboard computer system has lost communication with the Brake System Control Module 2 on the Chassis Expansion Bus. Common causes include Damaged wiring or connectors, Faulty Brake System Control Module 2, Issues with the Chassis Expansion Bus network. 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
U179D indicates Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus.
Common causes
Common causes include Damaged wiring or connectors, Faulty Brake System Control Module 2, Issues with the Chassis Expansion Bus network.
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 11, 2024
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Code U179D Description

The U179D diagnostic trouble code indicates that the vehicle's onboard computer system has lost communication with the Brake System Control Module 2 on the Chassis Expansion Bus. The Chassis Expansion Bus is a network that allows various control modules in the vehicle to communicate with each other. When the communication with the Brake System Control Module 2 is lost, it can lead to potential issues with the braking system, affecting the vehicle's overall performance and safety.

OBDII Code U179D - Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus
U179D Code - Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus

Common Causes of U179D

  1. Damaged wiring or connectors
  2. Faulty Brake System Control Module 2
  3. Issues with the Chassis Expansion Bus network
  4. Software glitches in the vehicle's computer system

Symptoms of U179D

  1. Intermittent or complete loss of braking functionality
  2. ABS system malfunctions
  3. Traction control issues
  4. Stability control problems
  5. Dashboard warning lights (ABS light, traction control light)

How to Fix U179D

  1. Perform a diagnostic scan to retrieve the U179D code and identify the specific cause of the communication failure.
  2. Inspect the wiring and connectors related to the Brake System Control Module 2 for any damage or corrosion. Repair or replace as necessary.
  3. Test the Brake System Control Module 2 for functionality and replace if found to be faulty.
  4. Check the Chassis Expansion Bus network for any issues or faults and address them accordingly.
  5. Clear the diagnostic trouble codes, reset the vehicle's computer system, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U179D

The typical repair costs for addressing the U179D code can vary depending on the specific cause of the communication failure. In general, the cost of parts such as wiring, connectors, or a new Brake System Control Module 2, along with labor costs, can range from $200 to $800. It's important to note that the diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your vehicle make and model.

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Code U179D Information for Specific Makes

  • U179D Buick — Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus
  • U179D Cadillac — Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus
  • U179D Chevrolet — Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus
  • U179D GMC — Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus
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 U179D Code

1. What are the common symptoms of OBDII code U179D - Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus?

- Common symptoms include the ABS warning light or traction control light illuminating on the dashboard, loss of ABS functionality, and potential issues with the brake system.

2. What are the possible causes of OBDII code U179D?

- The code U179D can be caused by a loose or damaged wiring connection, a faulty brake system control module, a communication network issue, or a malfunction within the chassis expansion bus.

3. How can I diagnose OBDII code U179D at home?

- You can start by checking the wiring connections related to the brake system control module 2, inspecting for any visible damage, and ensuring all connections are secure. You may also use an OBDII scanner to read and clear the code for troubleshooting.

4. Is it safe to drive with OBDII code U179D present?

- It is not recommended to drive the vehicle with code U179D active, as it could indicate a potential issue with the brake system control module 2, leading to safety concerns and compromised braking performance.

5. How do I repair OBDII code U179D - Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus?

- Repairing this code typically involves addressing the root cause, such as repairing or replacing damaged wiring, fixing any faulty brake system control module, or resolving communication network issues. Professional diagnosis and repair may be required.

6. Can a DIY enthusiast fix OBDII code U179D, or should I seek professional help?

- While some basic troubleshooting steps can be done by a DIY enthusiast, resolving OBDII code U179D often requires specialized tools and expertise. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

7. How much does it cost to fix OBDII code U179D?

- The cost of fixing OBDII code U179D can vary depending on the underlying issue causing the communication loss with the brake system control module 2. Costs may include parts replacement, labor charges, and diagnostic fees.

8. Will resetting the OBDII system clear code U179D permanently?

- Resetting the OBDII system may temporarily clear the code, but if the root cause of the communication issue is not addressed, the code is likely to reappear. It is essential to diagnose and fix the underlying problem for a permanent solution.

9. Can extreme weather conditions cause OBDII code U179D to trigger?

- Extreme weather conditions, such as excessive heat or moisture, can potentially impact the electrical connections and communication network, leading to the activation of code U179D. Inspecting and securing connections can help prevent weather-related issues.

10. Are there any recalls or technical service bulletins related to OBDII code U179D?

- It is advisable to check with the vehicle manufacturer or authorized service centers for any recalls or technical service bulletins related to OBDII code U179D. These resources may provide valuable information on known issues and solutions.

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