AutoCodes – Toyota – U0123 2018 Toyota RAV4

U0123 2018 Toyota RAV4 Code - Lost Communication with Yaw Rate Sensor 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 Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly), Yaw Rate and Acceleration Sensor 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: U0123 2018 Toyota RAV4 indicates Lost Communication with Yaw Rate Sensor Module.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly), Yaw Rate and Acceleration Sensor 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 270

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 25, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0123 2018 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 Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly) has not been received.

OBDII Code U0123 2018 Toyota RAV4 - Lost Communication with Yaw Rate Sensor Module - AutoCodes.com — U0123 2018 Toyota RAV4 Code - Lost Communication with Yaw Rate Sensor Module

What does this mean?

What are the Possible Causes of the DTC U0123 2018 Toyota RAV4?

Faulty Controller Area Network (CAN) Communication System
Faulty Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly)
Yaw Rate and Acceleration Sensor harness is open or shorted
Yaw Rate and Acceleration Sensor circuit poor electrical connection

How to Fix the DTC U0123 2018 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 U0123 2018 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 U0123 2018 Toyota RAV4 Code

1. What does the OBDII code U0123 in a 2018 Toyota RAV4 indicate?

The code U0123 signifies a "Lost Communication with Yaw Rate Sensor Module" error in the vehicle's onboard diagnostic system.

2. What are the common symptoms of the U0123 code in a 2018 Toyota RAV4?

Common symptoms include the illumination of the Check Engine Light, stability control issues, traction control malfunctions, and potential steering problems.

3. What are the possible causes of the U0123 code in a 2018 Toyota RAV4?

Potential causes may include a faulty yaw rate sensor module, damaged wiring or connectors, a malfunctioning control module, or software issues within the vehicle's system.

4. How can I diagnose the U0123 code in my 2018 Toyota RAV4?

Diagnosis typically involves using an OBDII scanner to retrieve the specific code, checking for any related trouble codes, inspecting the sensor module and its connections, and conducting a thorough visual inspection of the wiring.

5. Can I drive my 2018 Toyota RAV4 with the U0123 code present?

It is not recommended to drive the vehicle with the U0123 code active, as it may lead to safety and performance issues. It's best to address the problem promptly.

6. How can I repair the U0123 code in my 2018 Toyota RAV4?

Repair options may include replacing the yaw rate sensor module, repairing or replacing damaged wiring or connectors, reprogramming the control module, or addressing any software-related issues.

7. Is it possible to reset the U0123 code in a 2018 Toyota RAV4 without fixing the underlying issue?

While clearing the code may temporarily turn off the Check Engine Light, it's crucial to address the root cause to prevent potential safety hazards and ensure the vehicle operates correctly.

8. How much does it cost to repair the U0123 code in a 2018 Toyota RAV4?

The cost of repair can vary depending on the specific cause of the issue, the parts needed, and labor charges. It's advisable to consult a professional mechanic for an accurate estimate.

9. Can a DIY enthusiast fix the U0123 code issue in a 2018 Toyota RAV4?

Depending on your skill level and access to tools, some aspects of the repair may be tackled by a knowledgeable DIYer. However, complex electrical or sensor-related repairs are best left to experienced professionals.

10. How can I prevent the U0123 code from reoccurring in my 2018 Toyota RAV4?

To prevent the code from coming back, ensure regular vehicle maintenance, address any related trouble codes promptly, and follow proper driving practices to minimize strain on the vehicle's sensors and modules.