AutoCodes – GMC – U0123 GMC

U0123 GMC Code - Lost Communication with Yaw Rate Sensor Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Yaw Rate Sensor Module, Yaw Rate Sensor Module harness is open or shorted, Yaw Rate Sensor Module circuit poor electrical connection. 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, Yaw Rate Sensor Module harness is open or shorted, Yaw Rate Sensor Module circuit poor electrical connection.
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 629

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 Apr 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0123 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Yaw Rate Sensor Module has not been received.

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

What does this mean?

What are the Possible Causes of the DTC U0123 GMC?

Faulty Yaw Rate Sensor Module
Yaw Rate Sensor Module harness is open or shorted
Yaw Rate Sensor Module circuit poor electrical connection

How to Fix the DTC U0123 GMC?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0123 GMC 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 GMC code?

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

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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.