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U0129 2017 Toyota RAV4 Code - Lost Communication with Brake System Control Module

Quick Answer

The U0129 diagnostic trouble code (DTC) for a 2017 Toyota RAV4 indicates that there is a communication problem between the vehicle's onboard computer system and the Brake System Control Module. Common causes include Corroded or damaged wiring harness connecting the ECU and Brake System Control Module, Faulty Brake System Control Module, Software malfunction in the vehicle's ECU. 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 2017 Toyota RAV4 indicates Lost Communication with Brake System Control Module.
Common causes
Common causes include Corroded or damaged wiring harness connecting the ECU and Brake System Control Module, Faulty Brake System Control Module, Software malfunction in the vehicle's ECU.
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 16, 2024
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Code U0129 2017 Toyota RAV4 Description

The U0129 diagnostic trouble code (DTC) for a 2017 Toyota RAV4 indicates that there is a communication problem between the vehicle's onboard computer system and the Brake System Control Module. This module is responsible for controlling various aspects of the vehicle's braking system, such as anti-lock braking (ABS) and traction control. When communication is lost with this module, it can lead to issues with the vehicle's braking performance and safety systems.

OBDII Code U0129 2017 Toyota RAV4 - Lost Communication with Brake System Control Module
U0129 2017 Toyota RAV4 Code - Lost Communication with Brake System Control Module

Common Causes of U0129 2017 Toyota RAV4

  1. Corroded or damaged wiring harness connecting the ECU and Brake System Control Module
  2. Faulty Brake System Control Module
  3. Software malfunction in the vehicle's ECU
  4. Loose or disconnected connectors between the ECU and module
  5. Water damage or exposure to moisture affecting the module

Symptoms of U0129 2017 Toyota RAV4

  1. Illuminated ABS warning light on the dashboard
  2. Traction control system warning light activated
  3. Inconsistent or unresponsive brake pedal feel
  4. Increased stopping distance or reduced braking effectiveness
  5. Loss of stability control during braking or cornering

How to Fix U0129 2017 Toyota RAV4

  1. Perform a thorough diagnostic scan to retrieve the specific trouble codes and pinpoint the communication issue.
  2. Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the Brake System Control Module for functionality and replace if found to be faulty.
  4. Update the vehicle's software to address any potential glitches in the ECU.
  5. Clear the DTCs and perform a road test to ensure proper communication and functionality of the brake system.

Cost to Fix U0129 2017 Toyota RAV4

The typical repair costs for addressing a U0129 code on a 2017 Toyota RAV4 can vary depending on the specific cause of the communication failure. In general, the cost of parts such as a new Brake System Control Module or wiring harness can range from $200 to $800, while labor costs can add an additional $100 to $300. Overall, the total repair cost for this issue may fall within the range of $300 to $1100, including parts and labor.

What does this mean?

Tech Notes for U0129 2017 Toyota RAV4

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 2017 Toyota RAV4 Code

1. What are the common symptoms of OBDII code U0129 in a 2017 Toyota RAV4?

The common symptoms include the ABS warning light illuminated on the dashboard, loss of communication with the brake system control module, and potential issues with the vehicle's brake system functionality.

2. What causes the U0129 code (Lost Communication with Brake System Control Module) in a 2017 Toyota RAV4?

The U0129 code is usually caused by wiring issues, damaged connectors, a faulty brake system control module, or a malfunction in the communication network between the various control modules in the vehicle.

3. How can I diagnose the U0129 code in my 2017 Toyota RAV4?

Diagnosing the U0129 code typically involves using an OBDII scanner to retrieve the code, checking the wiring and connectors for any visible damage, and performing a thorough inspection of the brake system control module.

4. Can I still drive my 2017 Toyota RAV4 with the U0129 code active?

It is not recommended to drive your vehicle with the U0129 code active, as it indicates a communication failure with the brake system control module, which can affect the proper functioning of the vehicle's braking system.

5. How do I repair the U0129 code in my 2017 Toyota RAV4?

To repair the U0129 code, you may need to repair or replace damaged wiring and connectors, troubleshoot the brake system control module for faults, or reset the communication network between the control modules in the vehicle.

6. Is it safe to continue driving if the U0129 code (Lost Communication with Brake System Control Module) appears intermittently?

It is not advisable to continue driving if the U0129 code appears intermittently, as it indicates a potential issue with the communication between the brake system control module and other vehicle systems, which can compromise safety.

7. Can a DIY enthusiast fix the U0129 code in a 2017 Toyota RAV4?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing the U0129 code may require specialized tools and expertise, so it is advisable to consult a professional mechanic.

8. How much does it cost to fix the U0129 code in a 2017 Toyota RAV4?

The cost of fixing the U0129 code can vary depending on the underlying cause of the issue. It may range from a simple repair of wiring/connectors to a replacement of the brake system control module, costing anywhere from $100 to $500 or more.

9. Will resetting the fault codes make the U0129 code disappear permanently?

Simply resetting the fault codes may temporarily clear the U0129 code, but if the underlying issue causing the communication loss with the brake system control module is not addressed, the code is likely to reappear.

10. Can extreme weather conditions trigger the U0129 code in a 2017 Toyota RAV4?

Extreme weather conditions such as excessive heat or moisture can potentially cause electrical issues leading to the U0129 code. It is essential to ensure all components are properly sealed and protected from environmental factors to prevent such occurrences.

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