AutoCodes – Cadillac – U1111 Cadillac

U1111 Cadillac 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 Cadillac 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 508

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

What does this mean?

What are the Possible Causes of the DTC U1111 Cadillac?

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

How to Fix the DTC U1111 Cadillac?

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 Cadillac 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 Cadillac Code

1. What does the OBDII code U1111 Cadillac indicate?

The code U1111 signifies a communication error between the vehicle's onboard diagnostic system and the Chime Module.

2. What are the common symptoms of a U1111 Cadillac code?

Common symptoms include the loss of audible chimes for various functions like seat belt warnings, door ajar alerts, and other safety notifications.

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

The U1111 code can be triggered by issues such as a faulty Chime Module, damaged wiring or connectors, software glitches, or a malfunctioning Body Control Module (BCM).

4. How can I diagnose a U1111 Cadillac code?

Diagnosing a U1111 code typically involves using a professional OBDII scanner to retrieve the specific fault codes, checking the wiring and connections related to the Chime Module, and conducting a thorough visual inspection.

5. Can I still drive my Cadillac with a U1111 code?

While the U1111 code itself may not directly affect the drivability of the vehicle, it is important to address the underlying issue promptly to ensure all safety notifications are functioning properly.

6. How can I repair a U1111 Cadillac code?

Repairing a U1111 code often involves replacing the faulty Chime Module, repairing damaged wiring or connectors, updating software as needed, or addressing any underlying BCM issues.

7. Is it possible to reset a U1111 Cadillac code without repairs?

Resetting the code without addressing the underlying issue may temporarily clear the fault code, but it is likely to reappear until the root cause is resolved.

8. Can a DIY enthusiast fix a U1111 Cadillac code?

While some basic troubleshooting like checking connections and fuses can be done by DIY enthusiasts, diagnosing and repairing complex issues related to the U1111 code may require professional expertise.

9. How much does it cost to repair a U1111 Cadillac code?

The cost of repairing a U1111 code can vary depending on the specific issue causing the communication error, the labor rates of the repair shop, and the cost of any replacement parts needed.

10. How can I prevent a U1111 Cadillac code from recurring?

Regular maintenance, checking for loose connections or damaged wiring, and addressing any related issues promptly can help prevent the U1111 code from recurring in the future.