AutoCodes – Lexus – U0123 Lexus

U0123 Lexus 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 Lexus 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 750

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U0123 Lexus 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 Lexus - Lost Communication with Yaw Rate Sensor Module - AutoCodes.com — U0123 Lexus Code - Lost Communication with Yaw Rate Sensor Module

What does this mean?

What are the Possible Causes of the DTC U0123 Lexus?

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 Lexus?

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 Lexus 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.

Need more information about the U0123 Lexus code?

Need more information on how to fix the U0123 Lexus code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0123 Lexus code diagnosed by a professional: Find a repair shop in your area

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 Lexus Code

1. What are the common symptoms of OBDII code U0123 in a Lexus related to the Yaw Rate Sensor Module?

- Common symptoms include the ABS warning light, traction control light, and stability control light illuminating on the dashboard.

2. What typically causes the OBDII code U0123 in a Lexus, indicating a lost communication with the Yaw Rate Sensor Module?

- The code U0123 is usually triggered by a faulty yaw rate sensor module, damaged wiring, or a poor connection between the sensor and the vehicle's computer.

3. How can I diagnose the issue causing the OBDII code U0123 in my Lexus?

- A thorough inspection of the yaw rate sensor module, wiring harness, and connectors is recommended. Additionally, using a diagnostic scanner to retrieve specific error codes can help pinpoint the issue.

4. What steps should I take to repair the lost communication with the Yaw Rate Sensor Module in my Lexus?

- Repair options include checking and repairing any damaged wiring, ensuring proper connections, and potentially replacing the yaw rate sensor module if it is deemed faulty.

5. Can I drive my Lexus with the OBDII code U0123 related to the Yaw Rate Sensor Module?

- It is not recommended to drive the vehicle with this issue unresolved, as it may affect the stability control and traction control systems, compromising safety.

6. How much does it typically cost to repair the lost communication with the Yaw Rate Sensor Module in a Lexus?

- The cost of repairs can vary depending on the extent of the issue and whether any components need to be replaced. It is advisable to consult a professional for an accurate estimate.

7. Are there any temporary fixes or workarounds for the OBDII code U0123 in a Lexus?

- Temporary fixes are not recommended for safety reasons. It's best to address the root cause of the issue promptly to ensure proper functioning of the vehicle's safety systems.

8. How long does it take to repair the lost communication with the Yaw Rate Sensor Module in a Lexus?

- The repair time can vary based on the complexity of the issue and the availability of parts. It's advisable to consult a mechanic for a more accurate estimate of the repair duration.

9. Can the OBDII code U0123 related to the Yaw Rate Sensor Module cause any other problems in my Lexus?

- While the main issue is lost communication with the yaw rate sensor module, it can potentially lead to malfunctions in the vehicle's stability control and traction control systems if left unresolved.

10. Is it possible to prevent the OBDII code U0123 from occurring in my Lexus in the future?

- Regular maintenance checks, including inspecting wiring connections and sensor modules, can help prevent the occurrence of the U0123 code related to the Yaw Rate Sensor Module in your Lexus.