AutoCodes – Pontiac – U1111 Pontiac

U1111 Pontiac 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 Pontiac 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 588

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

What does this mean?

What are the Possible Causes of the DTC U1111 Pontiac?

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

How to Fix the DTC U1111 Pontiac?

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 Pontiac 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 Pontiac Code

What does OBDII code U1111 mean for a Pontiac vehicle?

OBDII code U1111 indicates "Lost Communication with Chime Module," which means the vehicle's computer has detected a communication failure with the chime module responsible for alert sounds.

What are common symptoms of the U1111 code?

Common symptoms include the absence of chimes for alerts (like seatbelt reminders), dashboard warning lights, and potentially other electrical issues related to the vehicleâ€™s warning systems.

What could cause the U1111 code to trigger?

Causes can include a faulty chime module, damaged wiring, poor connections, or issues with the vehicle's main control module that prevent proper communication.

How can I diagnose the U1111 code?

Start by checking the vehicle's wiring and connectors related to the chime module for any visible damage or corrosion. Use a scan tool to confirm the code and check for any other related codes.

Are there any quick fixes for the U1111 code?

Sometimes, reseating or cleaning the connectors associated with the chime module can restore communication. Additionally, checking the fuses related to the chime system may help.

What tools do I need to troubleshoot the U1111 code?

You'll need an OBDII scanner to read the codes, a multimeter for electrical testing, and basic hand tools for inspecting wiring and connectors.

Can I drive my Pontiac with a U1111 code?

While the vehicle may still operate normally, itâ€™s advisable to address the U1111 code promptly to ensure you receive important alerts from the chime module.

What should I do if the chime module is faulty?

If the chime module is determined to be faulty, it should be replaced with a compatible part. Ensure proper installation and reconnection to restore functionality.

Is resetting the code a permanent solution to U1111?

Resetting the code may temporarily clear the issue, but if the underlying problem (like a faulty module or wiring issue) isn't fixed, the code will likely reappear.