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U0129 Lexus Code - Lost Communication with Brake System Control Module

Quick Answer

The U0129 diagnostic trouble code (DTC) for Lexus vehicles indicates that there is a loss of communication with the Brake System Control Module. Common causes include Damaged wiring or connectors in the communication network, Faulty brake system control module, Software issues or glitches in the vehicle's 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
U0129 Lexus indicates Lost Communication with Brake System Control Module.
Common causes
Common causes include Damaged wiring or connectors in the communication network, Faulty brake system control module, Software issues or glitches in the vehicle's 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 11, 2024
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Code U0129 Lexus Description

The U0129 diagnostic trouble code (DTC) for Lexus vehicles indicates that there is a loss of communication with the Brake System Control Module. This means that the onboard computer is unable to establish a connection with the brake system control module, which can lead to a variety of issues with the vehicle's braking system. The brake system control module is responsible for controlling various aspects of the braking system, such as ABS (anti-lock braking system), traction control, electronic stability control, and brake assist. When communication with this module is lost, it can affect the vehicle's performance and safety.

OBDII Code U0129 Lexus - Lost Communication with Brake System Control Module
U0129 Lexus Code - Lost Communication with Brake System Control Module

Common Causes of U0129 Lexus

  1. Damaged wiring or connectors in the communication network.
  2. Faulty brake system control module.
  3. Software issues or glitches in the vehicle's computer system.
  4. Corrosion or water damage in the brake system control module.
  5. Electrical interference or signal disruption in the communication network.

Symptoms of U0129 Lexus

  1. Illuminated ABS or traction control warning light on the dashboard.
  2. Loss of ABS functionality or traction control features.
  3. Erratic or inconsistent braking behavior.
  4. Vehicle stability control system malfunctions.
  5. Difficulty in engaging or disengaging the electronic parking brake.

How to Fix U0129 Lexus

  1. Perform a diagnostic scan to retrieve the specific trouble codes and identify the root cause of the communication loss.
  2. Inspect the wiring harness, connectors, and communication network for any damage or corrosion. Repair or replace as necessary.
  3. Check the brake system control module for faults or malfunctions. Replace if needed.
  4. Clear the DTCs from the vehicle's computer system and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, consult with a professional mechanic or dealership for further diagnosis and repair.

Cost to Fix U0129 Lexus

The typical repair costs for addressing a lost communication with the brake system control module can range from $200 to $600, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that the cost can vary based on factors such as the location of the repair shop, the vehicle make and model, and the extent of the repair needed. Additionally, the diagnosis time and labor rates at auto repair shops can also impact the overall repair cost. It is recommended to obtain quotes from multiple repair shops to compare prices and ensure a fair and accurate estimate.

What does this mean?

Tech Notes for U0129 Lexus

When there are problems with the way different systems in a vehicle communicate with each other using a technology called Controller Area Network (CAN) communication, Diagnostic Trouble Codes (DTC) are displayed. These codes can be caused by issues with the main bus or branch of the communication network, or with the Electronic Control Units (ECUs) and sensors that make up the different systems. If you see code for both the CAN communication problems and internal or power source problems at the same time, you should focus on fixing the internal or power source problems first.

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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 U0129 Lexus Code

1. What are the common symptoms of OBDII code U0129 in a Lexus related to a lost communication with the Brake System Control Module?

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

2. What are some possible causes of the U0129 code indicating a communication problem with the Brake System Control Module in a Lexus?

- Possible causes may include damaged wiring or connectors, a faulty Brake System Control Module, a software glitch, or a fault in the CAN bus communication system.

3. How can I diagnose the U0129 code in a Lexus indicating a lost communication with the Brake System Control Module?

- Proper diagnosis involves checking the wiring and connectors for any visible damage, testing the Brake System Control Module for functionality, and using a diagnostic tool to scan the vehicle's system for any stored fault codes.

4. What are some tips for repairing the U0129 code related to a lost communication with the Brake System Control Module in a Lexus?

- Repair tips may include repairing or replacing damaged wiring and connectors, reprogramming the Brake System Control Module if necessary, and ensuring proper communication within the vehicle's network.

5. Can I continue driving my Lexus with the U0129 code triggered due to a lost communication with the Brake System Control Module?

- It is not recommended to continue driving the vehicle with this code active, as it may lead to potential safety issues related to brake performance and ABS functionality.

6. How much does it typically cost to repair the U0129 code in a Lexus caused by a communication problem with the Brake System Control Module?

- The cost of repair can vary depending on the underlying cause, but it may involve expenses for diagnostic work, parts replacement, and labor, which can range from a few hundred to over a thousand dollars.

7. Is it possible to reset the U0129 code related to a lost communication with the Brake System Control Module in a Lexus without fixing the underlying issue?

- Resetting the code without addressing the underlying problem is not recommended, as the issue will persist and potentially lead to further complications with the vehicle's braking system.

8. How long does it typically take to repair the U0129 code in a Lexus due to a lost communication with the Brake System Control Module?

- The repair time can vary based on the specific cause of the communication problem, but it may take a few hours to a full day for diagnostics, repairs, and testing to be completed.

9. Are there any preventative measures to avoid triggering the U0129 code in a Lexus related to a lost communication with the Brake System Control Module?

- Regular maintenance checks, inspecting wiring for damage, and promptly addressing any warning lights related to the ABS system can help prevent issues leading to this code.

10. Can a DIY enthusiast with automotive experience repair the U0129 code indicating a communication problem with the Brake System Control Module in a Lexus?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the specific cause of the U0129 code may require specialized tools and expertise best handled by a professional mechanic or technician.

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