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U0123 GMC Code - Lost Communication with Yaw Rate Sensor Module

Quick Answer

The U0123 diagnostic trouble code (DTC) for GMC vehicles indicates that there has been a loss of communication with the Yaw Rate Sensor Module. Common causes include Faulty Yaw Rate Sensor Module, Damaged wiring or connectors leading to the Yaw Rate Sensor, Corrosion or water damage affecting the sensor or its connections. 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 GMC indicates Lost Communication with Yaw Rate Sensor Module.
Common causes
Common causes include Faulty Yaw Rate Sensor Module, Damaged wiring or connectors leading to the Yaw Rate Sensor, Corrosion or water damage affecting the sensor or its connections.
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 13, 2024
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Code U0123 GMC Description

The U0123 diagnostic trouble code (DTC) for GMC vehicles indicates that there has been a loss of communication with the Yaw Rate Sensor Module. The Yaw Rate Sensor is a crucial component of the vehicle's stability control system, which helps to prevent skidding and loss of control during sudden maneuvers or slippery road conditions. This sensor measures the vehicle's rate of rotation around its vertical axis, providing important data to the vehicle's electronic stability control (ESC) system.

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

Common Causes of U0123 GMC

  1. Faulty Yaw Rate Sensor Module.
  2. Damaged wiring or connectors leading to the Yaw Rate Sensor.
  3. Corrosion or water damage affecting the sensor or its connections.
  4. Electronic control module (ECM) issues affecting communication with the Yaw Rate Sensor.
  5. Electrical interference or communication bus errors within the vehicle's network.

Symptoms of U0123 GMC

  1. Illumination of the ESC (Electronic Stability Control) warning light on the dashboard.
  2. Loss of traction control functionality.
  3. Increased difficulty in maintaining control during sharp turns or sudden maneuvers.
  4. Unusual or erratic behavior of the vehicle's stability control system.
  5. Possible activation of the vehicle's limp mode to prevent further damage.

How to Fix U0123 GMC

  1. Begin by conducting a thorough inspection of the Yaw Rate Sensor Module, wiring, and connectors for any visible damage or corrosion.
  2. Test the Yaw Rate Sensor Module using a diagnostic scanner to check for proper functionality and communication.
  3. Replace the Yaw Rate Sensor Module if it is found to be faulty or not communicating with the vehicle's systems.
  4. Repair or replace any damaged wiring or connectors leading to the Yaw Rate Sensor.
  5. Clear the DTC from the vehicle's memory using a diagnostic scanner and perform a road test to ensure proper operation of the stability control system.

Cost to Fix U0123 GMC

The cost of repairing a U0123 code related to a lost communication with the Yaw Rate Sensor Module can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing the Yaw Rate Sensor Module and addressing any related wiring or connector issues can range from $200 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple shops to ensure a competitive price. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable options.

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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 GMC Code

1. What are the common symptoms of OBDII code U0123 in a GMC vehicle?

The common symptoms of OBDII code U0123 include the ABS warning light or traction control light illuminating on the dashboard, along with potential issues with the vehicle's stability control system.

2. What does the OBDII code U0123 "Lost Communication with Yaw Rate Sensor Module" indicate in a GMC car?

The U0123 code indicates a communication problem between the vehicle's onboard computer and the yaw rate sensor module, which is responsible for measuring the vehicle's rate of rotation around its vertical axis.

3. What are the possible causes of the U0123 code in a GMC vehicle?

Potential causes of the U0123 code include a faulty yaw rate sensor module, damaged wiring or connectors leading to the sensor, a malfunctioning ABS module, or a problem with the vehicle's CAN bus communication system.

4. How can I diagnose the U0123 code in my GMC car?

Diagnosing the U0123 code typically involves using a diagnostic scanner to retrieve the specific error codes, checking the wiring and connectors leading to the yaw rate sensor module, and testing the sensor itself for proper functionality.

5. Can I continue driving my GMC vehicle with the U0123 code present?

It is not recommended to drive your vehicle with the U0123 code active, as it could lead to potential safety hazards due to the compromised stability control system. It is advisable to address the issue promptly.

6. How can I repair the U0123 code in my GMC car?

Repairing the U0123 code may involve replacing the faulty yaw rate sensor module, repairing damaged wiring or connectors, resetting the error codes with a diagnostic scanner, and testing the vehicle to ensure the issue has been resolved.

7. Will resetting the error codes make the U0123 code disappear permanently?

Resetting the error codes may temporarily clear the U0123 code, but if the underlying issue causing the communication problem persists, the code is likely to reappear. It is important to address the root cause of the problem for a permanent fix.

8. Can a DIY enthusiast fix the U0123 code issue in a GMC vehicle?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing the U0123 code may require specialized tools and technical expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

9. How much does it typically cost to repair the U0123 code in a GMC car?

The cost of repairing the U0123 code can vary depending on the underlying cause of the issue, the labor rates in your area, and whether any parts need to be replaced. It is advisable to obtain quotes from different repair shops for an accurate estimate.

10. Can the U0123 code be prevented in a GMC vehicle?

While some causes of the U0123 code may be unavoidable, regular maintenance, inspecting and repairing wiring/connectors, and addressing any related warning lights promptly can help prevent potential communication issues with the yaw rate sensor module.

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