AutoCodes – Buick – U1111 Buick

U1111 Buick 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 Buick 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 617

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

What does this mean?

What are the Possible Causes of the DTC U1111 Buick?

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

How to Fix the DTC U1111 Buick?

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 Buick 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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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 Buick Code

1. What are the common symptoms of OBDII code U1111 Buick (Lost Communication With Chime Module)?

- Common symptoms include the chime module not functioning properly, loss of audible notifications, and warning lights related to the chime system on the dashboard.

2. What are the possible causes of OBDII code U1111 Buick?

- Possible causes can include a faulty chime module, damaged wiring or connectors, communication bus issues, or a malfunctioning body control module.

3. How can I diagnose the cause of OBDII code U1111 Buick?

- Diagnose by checking the wiring and connectors for any visible damage, testing the chime module for proper functioning, and using a diagnostic scan tool to identify communication errors.

4. Can a DIY enthusiast repair OBDII code U1111 Buick?

- While basic checks like inspecting wiring and connectors can be done by DIY enthusiasts, diagnosing and repairing complex issues may require professional assistance due to the involvement of electronic systems.

5. Is it safe to continue driving with OBDII code U1111 Buick triggered?

- It is generally safe to drive with this code, but it is recommended to address the issue promptly to avoid missing important audible alerts or potentially causing further damage to the chime system.

6. How much does it typically cost to repair OBDII code U1111 Buick?

- The cost of repair can vary depending on the specific cause of the code. Simple fixes like repairing wiring may be inexpensive, while replacing a faulty chime module or control unit can be more costly.

7. Are there any temporary fixes for OBDII code U1111 Buick?

- Temporary fixes such as checking and reseating connectors or resetting the vehicle's computer system may resolve communication issues temporarily, but a permanent fix may require professional diagnosis and repair.

8. Can weather conditions affect the triggering of OBDII code U1111 Buick?

- Extreme weather conditions like excessive heat or moisture can potentially impact the chime module's functionality and communication, leading to the triggering of this OBDII code.

9. Will resetting the OBDII system clear the U1111 Buick code?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the lost communication with the chime module is not resolved, the code is likely to reappear.

10. How long does it typically take to repair OBDII code U1111 Buick?

- The repair time can vary depending on the complexity of the issue. Simple fixes may be completed within an hour, while more involved repairs might take several hours or more, especially if parts need to be ordered.