AutoCodes – Chevrolet – U0123 Chevrolet

U0123 Chevrolet 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 Chevrolet 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.

Save to My Repairs My Repairs

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

Code Popularity 769

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
Add Comment

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

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

What does this mean?

What are the Possible Causes of the DTC U0123 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the U0123 Chevrolet 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 Chevrolet Code

1. What are common symptoms of OBDII code U0123 in a Chevrolet related to lost communication with 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 can cause the OBDII code U0123 in a Chevrolet indicating lost communication with the Yaw Rate Sensor Module?

- Potential causes include a faulty Yaw Rate Sensor Module, damaged wiring or connectors, or a communication bus malfunction.

3. How can I diagnose the issue related to the U0123 code in my Chevrolet?

- Diagnosing the issue involves checking the wiring and connectors leading to the Yaw Rate Sensor Module, testing the module itself, and scanning the vehicle for any other related trouble codes.

4. Can driving with the U0123 code present cause any safety concerns?

- Driving with the U0123 code may affect the vehicle's stability control system, leading to potential safety risks, especially in slippery or challenging driving conditions.

5. What are some repair tips for resolving the U0123 code in a Chevrolet?

- Repair tips include inspecting and repairing any damaged wiring or connectors, testing and potentially replacing the Yaw Rate Sensor Module, and clearing the trouble codes with a diagnostic tool.

6. Is it possible to reset the U0123 code in a Chevrolet without fixing the underlying issue?

- While you can clear the trouble code temporarily, it is crucial to address the root cause to prevent the code from reappearing and ensure the proper functioning of the vehicle's stability control system.

7. Can a DIY enthusiast fix the U0123 code issue in a Chevrolet at home?

- Depending on the level of expertise and access to tools, a DIY enthusiast may be able to address the U0123 code by checking the wiring, connectors, and potentially replacing the Yaw Rate Sensor Module.

8. How much does it typically cost to repair the U0123 code related to the Yaw Rate Sensor Module in a Chevrolet?

- The cost of repair can vary based on the specific issue, with potential expenses including parts replacement, labor costs, and diagnostic fees from a mechanic or dealership.

9. Will ignoring the U0123 code in a Chevrolet affect other vehicle systems?

- Ignoring the U0123 code can lead to impaired stability control system functionality, potentially affecting other safety features and overall vehicle performance.

10. Is it necessary to visit a mechanic immediately after the U0123 code appears in a Chevrolet?

- While immediate attention is advisable to prevent safety risks, if the vehicle's drivability is not severely impacted, scheduling a diagnostic check with a mechanic at the earliest convenience is recommended.