Engine-Codes.com
Engine-Codes – GMC – U179D GMC

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

Quick Answer

The U179D GMC code indicates that there is a communication problem between the vehicle's onboard computer system and the Brake System Control Module 2 on the chassis expansion bus. Common causes include Damaged wiring or connectors in the communication network, Faulty Brake System Control Module 2, Malfunctioning onboard computer system. 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 GMC indicates Lost Communication With Brake System Control Module 2 On Chassis Expansion Bus.
Common causes
Common causes include Damaged wiring or connectors in the communication network, Faulty Brake System Control Module 2, Malfunctioning onboard computer system.
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 13, 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 U179D GMC Description

The U179D GMC code indicates that there is a communication problem between the vehicle's onboard computer system and 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 communication is lost with the Brake System Control Module 2, it can lead to issues with the vehicle's braking system, potentially compromising safety.

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

Common Causes of U179D GMC

  1. Damaged wiring or connectors in the communication network
  2. Faulty Brake System Control Module 2
  3. Malfunctioning onboard computer system
  4. Issues with the chassis expansion bus
  5. Software glitches or programming errors

Symptoms of U179D GMC

  1. Illumination of the ABS warning light on the dashboard
  2. Loss of ABS functionality
  3. Traction control system malfunction
  4. Erratic braking behavior
  5. Loss of communication with other vehicle control modules

How to Fix U179D GMC

  1. Perform a thorough inspection of the wiring and connectors in the communication network to identify any damage or corrosion. Repair or replace as necessary.
  2. Check the Brake System Control Module 2 for any signs of damage or malfunction. Replace if faulty.
  3. Use a diagnostic scan tool to reset the communication between the onboard computer system and the Brake System Control Module 2.
  4. Update the software and programming of the vehicle's control modules to ensure compatibility and proper communication.
  5. Test drive the vehicle to verify that the communication issue has been resolved and that the braking system functions correctly.

Cost to Fix U179D GMC

The typical repair costs for addressing a U179D GMC code can vary depending on the specific cause of the communication issue. On average, the repair costs for this type of problem can range from $200 to $800, including parts and labor. However, it is important to note that the actual cost can be higher or lower based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It is recommended to consult with a qualified mechanic or repair shop to get an accurate estimate for addressing this issue.

Need more information about the U179D GMC code?

Need more information on how to fix the U179D GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U179D GMC 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 U179D GMC Code

1. What are the common symptoms of OBDII code U179D GMC?

The common symptoms include ABS and traction control warning lights on the dashboard, loss of communication with the brake system module, and potential loss of brake control features.

2. What could cause the OBDII code U179D GMC to appear?

The code can be triggered by a communication failure between the chassis expansion bus and the brake system control module 2. This can be caused by issues with wiring, connectors, or the modules themselves.

3. How serious is the U179D GMC code related to lost communication with the brake system control module 2?

This code is considered serious because it can affect the proper functioning of the brake system, potentially compromising safety while driving.

4. Can I continue driving with the U179D GMC code present?

It is not recommended to continue driving with this code active, as it could lead to unpredictable brake behavior and compromise the vehicle's safety systems.

5. How can I diagnose the cause of the U179D GMC code?

Diagnosing the issue may involve checking the wiring and connectors between the chassis expansion bus and the brake system control module 2, as well as performing a scan to identify communication faults.

6. Are there any DIY repair tips for fixing the U179D GMC code?

DIY repair tips may include checking for loose or damaged wiring, ensuring connectors are properly seated, and resetting the codes to see if the communication is restored.

7. Is it necessary to visit a mechanic for the U179D GMC code repair?

Given the safety implications of brake system communication failure, it is advisable to have a qualified mechanic diagnose and repair the issue to ensure proper functionality.

8. How much does it cost to fix the U179D GMC code?

The cost of repair can vary depending on the underlying cause of the communication issue. It is recommended to obtain quotes from automotive professionals for an accurate estimate.

9. Can the U179D GMC code be intermittent?

Yes, in some cases, the communication issue leading to the U179D code may be intermittent, making it harder to diagnose. Monitoring the frequency of the code appearance can provide valuable information.

10. Does the U179D GMC code affect vehicle drivability?

While the vehicle may still be operable with the code present, it is important to address the issue promptly to ensure the brake system functions properly and the safety features are operational.

Discuss the causes and fixes for U179D GMC OBDII Code

Submit a New Comment

Code U179D GMC comments

No comments found for this page.