AutoCodes – Buick – U1173 Buick

U1173 Buick Code - Lost Communications With Power Roof 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 Power Roof Module (PRM), Power Roof Module harness is open or shorted, Power Roof 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: U1173 Buick indicates Lost Communications With Power Roof Module.
Common causes: Common causes include Faulty Power Roof Module (PRM), Power Roof Module harness is open or shorted, Power Roof 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 470

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 U1173 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) U1173 is set.

OBDII Code U1173 Buick - Lost Communications With Power Roof Module - AutoCodes.com — U1173 Buick Code - Lost Communications With Power Roof Module

What does this mean?

What are the Possible Causes of the DTC U1173 Buick?

Faulty Power Roof Module (PRM)
Power Roof Module harness is open or shorted
Power Roof Module circuit poor electrical connection

How to Fix the DTC U1173 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 U1173 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 U1173 Buick Code

1. What does OBDII code U1173 mean on a Buick?

U1173 indicates a communication issue with the Power Roof Module, meaning the module is not sending or receiving data properly over the vehicle's network.

2. What are the common symptoms of code U1173 in a Buick?

Symptoms may include a non-functional sunroof, intermittent operation, warning lights on the dashboard, or other electrical malfunctions related to the roof system.

3. What causes the U1173 code to appear in a Buick?

Common causes include a faulty Power Roof Module, damaged wiring or connectors, network communication issues, or a failing Body Control Module (BCM).

4. Can a weak battery cause the U1173 code?

Yes, a weak or failing battery can disrupt communication between modules and trigger the U1173 code.

5. How do I diagnose code U1173 in my Buick?

Start by checking the wiring and connectors for damage or corrosion near the Power Roof Module. Use a scan tool to monitor network communication and test the module's functionality.

6. Can I drive my Buick with the U1173 code?

Yes, but the sunroof or power roof system may not function properly, and ignoring the issue could lead to further electrical problems.

7. How do I fix the U1173 code on my Buick?

Repairs may include fixing or replacing damaged wiring, cleaning corroded connectors, reprogramming the Power Roof Module, or replacing it if it's defective.

8. How much does it cost to fix a U1173 code in a Buick?

The cost depends on the root cause. Simple repairs like fixing wiring or connectors may cost under $100, while module replacement can range from $300 to $800 or more.

9. Can a software update resolve the U1173 code?

In some cases, a software update or reprogramming of the Power Roof Module or BCM can resolve the issue if itâ€™s caused by a software glitch.

10. Do I need a professional to fix the U1173 code?

While basic checks like inspecting wiring can be done at home, diagnosing and repairing communication issues often require specialized tools and expertise, so a professional is recommended.