AutoCodes – Chevrolet – U1111 Chevrolet

U1111 Chevrolet Code - Lost Communication With Chime Module

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Chime Module, Chime Module harness is open or shorted, Chime 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: U1111 Chevrolet indicates Lost Communication With Chime Module.
Common causes: Common causes include Faulty Chime Module, Chime Module harness is open or shorted, Chime 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 1,054

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1111 Chevrolet Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1111 is set.

OBDII Code U1111 Chevrolet - Lost Communication With Chime Module - AutoCodes.com — U1111 Chevrolet Code - Lost Communication With Chime Module

What does this mean?

What are the Possible Causes of the DTC U1111 Chevrolet?

Faulty Chime Module
Chime Module harness is open or shorted
Chime Module circuit poor electrical connection

How to Fix the DTC U1111 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 U1111 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.

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Need more information on how to fix the U1111 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1111 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 U1111 Chevrolet Code

1. What does the OBDII code U1111 for Chevrolet indicate?

The U1111 code signifies that the vehicle's onboard diagnostics system has lost communication with the chime module.

2. What are the common symptoms of a U1111 code in a Chevrolet vehicle?

Common symptoms of a U1111 code include a malfunctioning chime system, no sound from the vehicle's warning chimes, and potential issues with other vehicle functions linked to the chime module.

3. What are the possible causes of a U1111 code in a Chevrolet?

The U1111 code can be triggered by issues such as a faulty chime module, damaged wiring or connectors related to the chime module, a blown fuse, or a communication error within the vehicle's network.

4. How can I diagnose a U1111 code in my Chevrolet?

Diagnosing a U1111 code typically involves checking the chime module for power and ground, inspecting the wiring harness for damage, testing the communication lines, and using a diagnostic scanner to retrieve further information from the vehicle's system.

5. Can a U1111 code in a Chevrolet be fixed at home?

If the issue is related to a loose connection, damaged wiring, or a blown fuse, some DIY enthusiasts with the necessary tools and skills may be able to address the problem at home. However, complex issues with the chime module itself may require professional diagnosis and repair.

6. Is it safe to drive with a U1111 code present in a Chevrolet?

While the U1111 code itself may not pose an immediate safety risk, it's important to address the underlying communication issue with the chime module to ensure proper functioning of warning chimes and other related systems for overall vehicle safety.

7. How much does it cost to repair a U1111 code in a Chevrolet?

The cost of repairing a U1111 code can vary depending on the specific cause of the communication failure, the labor rates in your area, and whether any parts need to be replaced. It's recommended to obtain quotes from trusted mechanics or dealerships for an accurate estimate.

8. Can a U1111 code be cleared without fixing the underlying issue?

While it's possible to clear the U1111 code using a diagnostic scanner, the root cause of the communication problem with the chime module should be identified and resolved to prevent the code from reoccurring.

9. Will a U1111 code cause my Chevrolet to fail an emissions test?

The U1111 code is not directly related to emissions control, so it typically will not cause your Chevrolet to fail an emissions test. However, unresolved communication issues within the vehicle's system should be addressed for overall vehicle performance and functionality.

10. How long does it take to repair a U1111 code in a Chevrolet?

The repair time for a U1111 code can vary depending on the cause of the communication problem and the complexity of the repair. Simple fixes like reconnecting a loose wire may take less time, while diagnosing and replacing a faulty chime module could require more extensive work.