AutoCodes – Cadillac – U1173 Cadillac

U1173 Cadillac 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 Cadillac 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 426

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 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) U1173 is set.

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

What does this mean?

What are the Possible Causes of the DTC U1173 Cadillac?

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 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 U1173 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 U1173 Cadillac Code

1. What are common symptoms of OBDII code U1173 in a Cadillac related to "Lost Communications With Power Roof Module"?

- Common symptoms include malfunctioning power roof operation, failure of roof control functions, and possible warning lights on the dashboard.

2. What are the potential causes of the U1173 Cadillac trouble code?

- The code U1173 can be triggered by issues such as faulty wiring connections, damaged or disconnected wires, a malfunctioning power roof module, or issues with the vehicle's communication network.

3. How can I diagnose the U1173 code in my Cadillac?

- To diagnose the U1173 code, it is advisable to start by checking the wiring connections to the power roof module, inspecting for any visible damage or loose connections. Using a diagnostic scanner to read the code and check for additional fault codes is also recommended.

4. What steps should I take to repair the U1173 code related to the Lost Communications With Power Roof Module in my Cadillac?

- Repair steps may include fixing any damaged wiring, ensuring all connections are secure, replacing the power roof module if necessary, and clearing the trouble codes with a diagnostic scanner after the repair.

5. Can the U1173 code be reset without fixing the underlying issue in a Cadillac?

- While it is possible to clear the U1173 trouble code temporarily by using a diagnostic scanner to reset the system, it is crucial to address and repair the root cause to prevent the code from reoccurring.

6. Is it safe to continue driving my Cadillac with the U1173 trouble code present?

- It is generally not recommended to continue driving the vehicle with the U1173 code, as it may lead to further issues with the power roof module or affect other vehicle systems. It is best to address the problem promptly.

7. How can I prevent the U1173 trouble code from appearing in my Cadillac in the future?

- Regularly inspecting the wiring connections associated with the power roof module, ensuring proper maintenance of the vehicle's electrical system, and addressing any issues promptly can help prevent the U1173 trouble code from occurring.

8. Can a DIY enthusiast fix the U1173 trouble code issue in a Cadillac?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to address the U1173 trouble code by following repair guides, checking wiring connections, and possibly replacing components like the power roof module.

9. Is it common for Cadillac vehicles to experience the U1173 trouble code related to Lost Communications With Power Roof Module?

- While the U1173 code may not be as common as some other OBDII codes, Cadillac vehicles equipped with power roof systems can experience communication issues leading to this trouble code, especially in older models.

10. Can extreme weather conditions contribute to triggering the U1173 trouble code in a Cadillac?

- Extreme weather conditions, such as exposure to moisture, humidity, or temperature fluctuations, can potentially impact the wiring connections or electronic components related to the power roof module, leading to the U1173 trouble code.