AutoCodes – Generic – U0123

U0123 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 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 25,252

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

What does this mean?

What are the Possible Causes of the DTC U0123?

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?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

U0123 Buick — Lost Communication with Yaw Rate Sensor Module
U0123 Cadillac — Lost Communication with Yaw Rate Sensor Module
U0123 Chevrolet — Lost Communication with Yaw Rate Sensor Module
U0123 GMC — Lost Communication with Yaw Rate Sensor Module
U0123 Lexus — Lost Communication with Yaw Rate Sensor Module
U0123 Toyota — 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 Code

1. What does OBDII code U0123 mean?

Code U0123 indicates a loss of communication between the Yaw Rate Sensor Module and other vehicle control modules, often affecting stability control systems.

2. What are common symptoms of code U0123?

Symptoms may include a disabled stability control system, illuminated warning lights such as the ABS or traction control light, and reduced vehicle handling performance.

3. What causes code U0123?

Common causes include a faulty Yaw Rate Sensor Module, damaged wiring or connectors, module communication issues, or power supply problems to the sensor.

4. Can I drive with code U0123?

While the vehicle may still be drivable, the stability control system will likely be disabled, which can increase the risk of losing control in slippery conditions.

5. How do I diagnose code U0123?

Start by inspecting the wiring and connectors around the Yaw Rate Sensor Module and related control modules for damage or corrosion. Use a scan tool to check for other related codes.

6. How is code U0123 fixed?

Repairs may involve replacing the Yaw Rate Sensor Module, repairing damaged wiring, cleaning corroded connectors, or updating the vehicle's software.

7. Where is the Yaw Rate Sensor Module located?

The Yaw Rate Sensor Module is typically located under the center console or near the floor in the middle of the vehicle, but its exact location can vary depending on the make and model.

8. Can a dead battery cause code U0123?

Yes, a dead or weak battery can lead to communication issues between modules, potentially triggering code U0123.

9. Does code U0123 require module reprogramming?

In some cases, reprogramming or recalibrating the Yaw Rate Sensor Module or other related control modules may be necessary after repairs.

10. How much does it cost to repair code U0123?

Repair costs can vary widely, ranging from $50 to $500 or more, depending on whether the issue is a simple wiring repair or a sensor/module replacement.