AutoCodes – Toyota – U0129 2013 Toyota RAV4

U0129 2013 Toyota RAV4 Code - Lost Communication with Brake System Control Module

Quick Answer

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Brake System Control Module, Brake System Control Module harness is open or shorted. 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 2013 Toyota RAV4 indicates Lost Communication with Brake System Control Module.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Brake System Control Module, Brake System Control Module harness is open or shorted.
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.

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Code Popularity 366

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 26, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0129 2013 Toyota RAV4 Description

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. The exchange of operating information and commands among devices is facilitated by pre-programmed information about the required message exchange on the serial data circuits. Communication is carried out using two dedicated wires, known as CAN high and CAN low, with both lines carrying 2.5V when the CAN bus is in idle mode. During the transmission of data bits, the CAN high line increases to 3.75V while the CAN low drops to 1.25V, creating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Brake System Control Module has not been received.

OBDII Code U0129 2013 Toyota RAV4 - Lost Communication with Brake System Control Module - AutoCodes.com — U0129 2013 Toyota RAV4 Code - Lost Communication with Brake System Control Module

What does this mean?

What are the Possible Causes of the DTC U0129 2013 Toyota RAV4?

Faulty Controller Area Network (CAN) Communication System
Faulty Brake System Control Module
Brake System Control Module harness is open or shorted
Brake System Control Module circuit poor electrical connection

How to Fix the DTC U0129 2013 Toyota RAV4?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0129 2013 Toyota RAV4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 2013 Toyota RAV4 Code

1. What does the OBDII code U0129 on a 2013 Toyota RAV4 indicate?

The code U0129 signifies a "Lost Communication with Brake System Control Module" error.

2. What are the common symptoms of U0129 in a 2013 Toyota RAV4?

Common symptoms include the ABS warning light, traction control light, or brake warning light illuminating on the dashboard.

3. What are the possible causes of the U0129 code in a 2013 Toyota RAV4?

Potential causes of U0129 include a faulty brake system control module, damaged wiring or connectors, or a communication network issue.

4. How can I diagnose the U0129 code in my 2013 Toyota RAV4?

Diagnosing U0129 requires a professional OBDII scanner to retrieve the trouble codes and further testing to pinpoint the exact cause, such as checking the wiring and connections.

5. Can I still drive my 2013 Toyota RAV4 with the U0129 code?

It is not recommended to drive your vehicle with the U0129 code as it may affect the proper functioning of the brake system and other safety features.

6. How can I repair the U0129 code in my 2013 Toyota RAV4?

Repairing the U0129 code typically involves addressing the root cause, which may include replacing the brake system control module, repairing damaged wiring, or fixing communication network issues.

7. Is it safe to reset the U0129 code in my 2013 Toyota RAV4 without fixing the underlying issue?

Resetting the code without addressing the underlying problem is not recommended, as the issue may persist and potentially compromise the safety and performance of your vehicle.

8. How much does it cost to fix the U0129 code in a 2013 Toyota RAV4?

The cost of fixing the U0129 code can vary depending on the exact cause of the issue, parts needed for replacement, and labor charges from a mechanic or dealership.

9. Can a DIY enthusiast fix the U0129 code in a 2013 Toyota RAV4?

While some basic troubleshooting steps can be taken by DIY enthusiasts, diagnosing and repairing the U0129 code may require specialized tools and expertise best handled by a professional mechanic.

10. Will the U0129 code cause my 2013 Toyota RAV4 to fail an emissions test?

The U0129 code itself may not directly cause your vehicle to fail an emissions test, but it indicates a problem that should be addressed to ensure the overall health and performance of your vehicle.