AutoCodes – Toyota – U0123 Toyota

U0123 Toyota 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 Toyota 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 2,590

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 25, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0123 Toyota 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 Toyota - Lost Communication with Yaw Rate Sensor Module - AutoCodes.com — U0123 Toyota Code - Lost Communication with Yaw Rate Sensor Module

What does this mean?

What are the Possible Causes of the DTC U0123 Toyota?

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 Toyota?

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 Toyota 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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Information for Specific Toyota Models

U0123 2013 Toyota RAV4 — Lost Communication with Yaw Rate Sensor Module
U0123 2014 Toyota RAV4 — Lost Communication with Yaw Rate Sensor Module
U0123 2015 Toyota RAV4 — Lost Communication with Yaw Rate Sensor Module
U0123 2016 Toyota RAV4 — Lost Communication with Yaw Rate Sensor Module
U0123 2017 Toyota RAV4 — Lost Communication with Yaw Rate Sensor Module
U0123 2018 Toyota RAV4 — Lost Communication with Yaw Rate Sensor Module

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 Toyota Code

What does the OBDII code U0123 mean on a Toyota?

1. U0123 indicates that the vehicle's control modules have lost communication with the Yaw Rate Sensor Module, which monitors the vehicle's lateral and rotational movement for stability control. 2.

What are the common symptoms of the U0123 code on a Toyota?

Symptoms may include the ABS or traction control warning light turning on, reduced stability control functionality, or no noticeable driving issues in some cases. 3.

What causes the U0123 code to appear on a Toyota?

Common causes include a faulty yaw rate sensor, wiring or connector issues, a malfunctioning ABS module, or a problem with the vehicle's CAN (Controller Area Network) communication system. 4.

Can I drive my Toyota with a U0123 code?

While the vehicle may still be drivable, it is not recommended to drive for long periods, as stability control and safety features like ABS may not function properly. 5.

How do I diagnose the U0123 code on my Toyota?

Start by checking the wiring and connectors to the yaw rate sensor for damage or loose connections. Use a scan tool to verify communication with the sensor and inspect for related codes. 6.

Where is the yaw rate sensor located in a Toyota?

The yaw rate sensor is typically located under the center console, beneath the dashboard, or near the vehicle's floorboard, depending on the model. 7.

How do I fix the U0123 code on a Toyota?

Repairs may include reconnecting or replacing damaged wiring, cleaning corroded connectors, recalibrating the yaw rate sensor, or replacing the sensor if it is faulty. 8.

What tools are needed to troubleshoot the U0123 code?

A diagnostic scan tool with CAN communication capabilities, a multimeter, and basic tools for inspecting and repairing wiring are commonly used. 9.

How much does it cost to fix the U0123 code on a Toyota?

Repair costs vary depending on the issue. Replacing a yaw rate sensor typically ranges from $200 to $600, while wiring repairs may be less expensive. 10.

Does clearing the U0123 code solve the problem?

Clearing the code does not fix the underlying issue. The cause of the communication loss must be identified and repaired to prevent the code from returning.