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U0129 2014 Toyota RAV4 Code - Lost Communication with Brake System Control Module

Quick Answer

The U0129 diagnostic trouble code (DTC) for a 2014 Toyota RAV4 indicates that there is a communication issue between the vehicle's onboard computer system and the Brake System Control Module. Common causes include Faulty brake system control module, Wiring or connection issues between the ECM and brake module, Communication network problems within the vehicle. 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 2014 Toyota RAV4 indicates Lost Communication with Brake System Control Module.
Common causes
Common causes include Faulty brake system control module, Wiring or connection issues between the ECM and brake module, Communication network problems within the vehicle.
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 2014 Toyota RAV4 Description

The U0129 diagnostic trouble code (DTC) for a 2014 Toyota RAV4 indicates that there is a communication issue between the vehicle's onboard computer system and the Brake System Control Module. This means that the main engine control module (ECM) is unable to communicate with the brake system module, which can lead to a variety of potential issues affecting the vehicle's performance and safety.

OBDII Code U0129 2014 Toyota RAV4 - Lost Communication with Brake System Control Module
U0129 2014 Toyota RAV4 Code - Lost Communication with Brake System Control Module

Common Causes of U0129 2014 Toyota RAV4

  1. Faulty brake system control module.
  2. Wiring or connection issues between the ECM and brake module.
  3. Communication network problems within the vehicle.
  4. ECM malfunction or software glitches.

Symptoms of U0129 2014 Toyota RAV4

  1. Illumination of the ABS, TCS, or ESC warning lights on the dashboard.
  2. Loss of ABS functionality, resulting in longer braking distances or potential skidding.
  3. Inability to engage traction control in slippery conditions.
  4. Erratic or inconsistent brake system behavior, such as sudden brake engagement or release.

How to Fix U0129 2014 Toyota RAV4

  1. Begin by conducting a thorough diagnostic scan to retrieve the specific trouble codes and pinpoint the source of the communication failure.
  2. Inspect the wiring harness and connectors between the ECM and brake system control module for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the communication network within the vehicle to ensure proper functionality and connectivity between modules.
  4. If the issue persists, consider replacing the brake system control module or addressing any ECM-related problems with the help of a professional technician.

Cost to Fix U0129 2014 Toyota RAV4

The cost of repairing a U0129 code in a 2014 Toyota RAV4 can vary depending on the specific cause of the communication failure and the required repairs. On average, the parts for replacing a brake system control module can range from $200 to $500, while the labor costs can add another $100 to $200 to the total repair bill. Overall, the total cost for resolving this issue may fall within the range of $300 to $700. It is important to note that diagnostic time and labor rates can vary between auto repair shops, so it's advisable to obtain quotes from several reputable technicians to get a more accurate cost estimate based on your location and vehicle specifics.

What does this mean?

Tech Notes for U0129 2014 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 2014 Toyota RAV4 Code

1. What does the OBDII code U0129 mean on a 2014 Toyota RAV4?

The code U0129 indicates a communication problem between the vehicle's engine control module (ECM) and the brake system control module.

2. What are the common symptoms of U0129 on a Toyota RAV4?

Common symptoms of U0129 include the ABS warning light, traction control light, or brake warning light illuminating on the dashboard. Additionally, you may experience issues with the ABS system or traction control system.

3. What are the possible causes of U0129 on a 2014 Toyota RAV4?

Possible causes of U0129 include a faulty brake system control module, damaged wiring or connectors, a software glitch, or a communication network issue within the vehicle.

4. How can I diagnose the U0129 code on my Toyota RAV4?

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

5. Can I still drive my Toyota RAV4 with the U0129 code?

It is not recommended to drive your Toyota RAV4 with the U0129 code present, as it indicates a communication issue with an essential safety system like the brake system control module. It's best to have the vehicle inspected and repaired as soon as possible.

6. How can I repair the U0129 code on my Toyota RAV4?

Repairing the U0129 code may involve replacing the brake system control module if it is determined to be faulty. Additionally, repairing any damaged wiring or connectors and ensuring proper communication network functionality may resolve the issue.

7. Can I reset the U0129 code on my Toyota RAV4 with a simple DIY method?

Resetting the U0129 code may be possible by using an OBDII scanner to clear the code. However, it is essential to address the underlying cause of the code to prevent it from reoccurring.

8. Are there any common mistakes to avoid when dealing with the U0129 code on a Toyota RAV4?

When dealing with the U0129 code, avoid overlooking the brake system control module as a potential cause of the communication issue. It's crucial to perform a comprehensive diagnosis to pinpoint the exact problem accurately.

9. Is the U0129 code on a Toyota RAV4 a serious issue?

The U0129 code should be taken seriously as it relates to a communication problem with the vehicle's brake system control module. Ignoring this issue could potentially impact the safety and performance of the vehicle's braking system.

10. How much can I expect to pay to fix the U0129 code on my 2014 Toyota RAV4?

The cost of fixing the U0129 code on a Toyota RAV4 can vary depending on the underlying cause of the issue. Repair costs may include diagnostic fees, parts replacement, and labor costs, so it's advisable to consult a professional mechanic for an accurate estimate.

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