AutoCodes – Buick – U1176 Buick

U1176 Buick Code - Loss Of Remote Function Actuator Communications

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Remote Function Actuator (RFA), Remote Function Actuator harness is open or shorted, Remote Function Actuator 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: U1176 Buick indicates Loss Of Remote Function Actuator Communications.
Common causes: Common causes include Faulty Remote Function Actuator (RFA), Remote Function Actuator harness is open or shorted, Remote Function Actuator 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 623

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 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1176 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) U1176 is set.

OBDII Code U1176 Buick - Loss Of Remote Function Actuator Communications - AutoCodes.com — U1176 Buick Code - Loss Of Remote Function Actuator Communications

What does this mean?

What are the Possible Causes of the DTC U1176 Buick?

Faulty Remote Function Actuator (RFA)
Remote Function Actuator harness is open or shorted
Remote Function Actuator circuit poor electrical connection

How to Fix the DTC U1176 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 U1176 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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Need Help with the Code?

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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 U1176 Buick Code

1. What does the OBDII code U1176 mean on a Buick?

U1176 indicates a loss of communication with the Remote Function Actuator, which manages features like keyless entry and remote start.

2. What are the common symptoms of code U1176 in a Buick?

Symptoms may include non-functional keyless entry, issues with remote start, and warning lights on the dashboard.

3. What causes the U1176 code in a Buick?

Common causes include wiring issues, connector problems, module failure, or interference in the communication network.

4. Can a weak car battery trigger code U1176?

Yes, a weak battery can cause communication errors and may trigger this code.

5. How do I diagnose code U1176 in a Buick?

Use an advanced scan tool to check for communication errors, inspect wiring and connectors, and test the Remote Function Actuator for proper operation.

6. Is it safe to drive with code U1176 on a Buick?

While the vehicle is typically drivable, loss of remote functions can be inconvenient and may indicate underlying electrical issues that should be addressed.

7. How do I fix code U1176 on a Buick?

Repairs may include checking and repairing damaged wiring, cleaning or reconnecting module connectors, or replacing the Remote Function Actuator if faulty.

8. Can a software update resolve code U1176 on a Buick?

In some cases, a software update or reprogramming the affected modules may resolve communication issues.

9. What tools are needed to troubleshoot U1176 on a Buick?

You'll need an advanced diagnostic scanner capable of reading Buick-specific codes and accessing module communication data.

10. Does code U1176 require professional repair?

If the problem involves complex wiring or module replacement, professional assistance may be necessary for proper diagnosis and repair.

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