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Engine-Codes – Generic – U0123

U0123 Code - Lost Communication with Yaw Rate Sensor Module

Quick Answer

The U0123 diagnostic trouble code (DTC) indicates that there is a communication issue between the vehicle's onboard computer system and the Yaw Rate Sensor Module. Common causes include Damaged or corroded wiring harness leading to the Yaw Rate Sensor Module, Loose or disconnected wiring connections between the sensor module and the vehicle's computer system, A malfunctioning Yaw Rate Sensor Module. 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 Damaged or corroded wiring harness leading to the Yaw Rate Sensor Module, Loose or disconnected wiring connections between the sensor module and the vehicle's computer system, A malfunctioning Yaw Rate Sensor Module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code U0123 Description

The U0123 diagnostic trouble code (DTC) indicates that there is a communication issue between the vehicle's onboard computer system and the Yaw Rate Sensor Module. The Yaw Rate Sensor is a crucial component responsible for detecting the vehicle's angular velocity or rotational motion around its vertical axis. This information is essential for systems like the electronic stability control (ESC) and traction control to function properly. When communication with the Yaw Rate Sensor Module is lost, it can lead to a variety of performance issues and potentially compromise the safety systems of the vehicle.

OBDII Code U0123 - Lost Communication with Yaw Rate Sensor Module
U0123 Code - Lost Communication with Yaw Rate Sensor Module

Common Causes of U0123

  1. Damaged or corroded wiring harness leading to the Yaw Rate Sensor Module.
  2. Loose or disconnected wiring connections between the sensor module and the vehicle's computer system.
  3. A malfunctioning Yaw Rate Sensor Module.
  4. Issues with the vehicle's onboard computer system causing communication errors.
  5. Electrical interference or signal disruptions affecting the communication between components.

Symptoms of U0123

  1. The ESC and traction control warning lights may illuminate on the dashboard.
  2. The vehicle may experience erratic or unresponsive steering.
  3. Decreased stability and handling, especially during sharp turns or sudden maneuvers.
  4. Reduced fuel efficiency due to compromised electronic systems.
  5. Difficulty maintaining control in slippery or uneven road conditions.

How to Fix U0123

  1. Begin by conducting a thorough visual inspection of the wiring harness connected to the Yaw Rate Sensor Module for any signs of damage or corrosion. Repair or replace any faulty wiring as needed.
  2. Check and secure all wiring connections between the sensor module and the vehicle's computer system to ensure a stable communication link.
  3. Test the Yaw Rate Sensor Module for proper functionality using a diagnostic tool. Replace the sensor if it is found to be faulty.
  4. Clear the DTC from the vehicle's computer system using an OBD-II scanner to reset the communication error.
  5. Perform a road test to verify that the ESC and traction control systems are functioning correctly and that the U0123 code does not reappear.

Cost to Fix U0123

The typical repair costs for addressing a U0123 code can range from $200 to $500, depending on the specific cause of the communication issue and the cost of replacement parts. This estimate includes the cost of diagnostic testing, labor, and any necessary repairs or replacements. It is important to note that the actual repair costs can vary significantly based on the vehicle make and model, the location of repair, and the extent of the communication problem. It is advisable to consult with a qualified mechanic or repair shop to obtain a more accurate estimate based on the specific circumstances.

What does this mean?

Tech Notes for U0123

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.

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Code U0123 Information for Specific Makes

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.

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