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U1173 Pontiac Code - Lost Communications With Power Roof Module

Quick Answer

The U1173 code indicates a communication failure between the vehicle's onboard computer and the Power Roof Module (PRM). Common causes include Faulty Power Roof Module (PRM) that has failed internally, Damaged or corroded wiring harnesses connecting the PRM to the vehicle's electrical system, Poor connections at the PRM or related connectors due to corrosion or wear. 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 Pontiac indicates Lost Communications With Power Roof Module.
Common causes
Common causes include Faulty Power Roof Module (PRM) that has failed internally, Damaged or corroded wiring harnesses connecting the PRM to the vehicle's electrical system, Poor connections at the PRM or related connectors due to corrosion or wear.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 26, 2024
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Code U1173 Pontiac Description

The U1173 code indicates a communication failure between the vehicle's onboard computer and the Power Roof Module (PRM). This module is responsible for controlling the operation of the convertible top or sunroof in vehicles equipped with such features. When the PRM fails to communicate with the vehicle's network, it can lead to a range of operational issues, primarily affecting the functionality of the roof mechanism.

OBDII Code U1173 Pontiac - Lost Communications With Power Roof Module
U1173 Pontiac Code - Lost Communications With Power Roof Module

Common Causes of U1173 Pontiac

  1. Faulty Power Roof Module (PRM) that has failed internally.
  2. Damaged or corroded wiring harnesses connecting the PRM to the vehicle's electrical system.
  3. Poor connections at the PRM or related connectors due to corrosion or wear.
  4. Software issues or glitches within the vehicle's control modules.
  5. External factors such as water intrusion or physical damage to the roof mechanism.

Symptoms of U1173 Pontiac

  1. Inability to open or close the convertible top or sunroof.
  2. Dashboard warning lights related to the roof system illuminated.
  3. Erratic or inconsistent operation of the roof mechanism.
  4. Other electrical components, such as windows or locks, may also exhibit issues.
  5. Diagnostic scanner shows U1173 code along with other related codes.

How to Fix U1173 Pontiac

  1. Diagnostic Scan: Begin by using an OBD-II scanner to confirm the U1173 code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Inspect the wiring harnesses and connectors associated with the PRM for signs of damage, corrosion, or loose connections.
  3. Module Testing: Test the Power Roof Module for functionality. This may involve checking power and ground circuits, as well as communication signals with other modules.
  4. Repair or Replace: If the PRM is found to be faulty, replace it with a new or refurbished unit. If wiring issues are present, repair or replace damaged sections of the harness.
  5. Reprogramming: After replacement, ensure that the new module is properly programmed to communicate with the vehicle's network, which may require specialized equipment.

Cost to Fix U1173 Pontiac

The cost to repair the U1173 code can vary widely based on the specific diagnosis and repair needed. On average, the total cost may range from $200 to $800, which includes parts and labor. The Power Roof Module itself can cost anywhere from $100 to $400, depending on whether it is new or refurbished. Labor costs typically range from $80 to $150 per hour, with the total time for diagnosis and repair potentially taking 2 to 4 hours.

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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 Pontiac Code

1. What are the common symptoms of OBDII code U1173 in a Pontiac related to lost communications with the power roof module?

- Common symptoms include malfunctioning power roof operation, inoperative roof controls, and warning lights on the dashboard.

2. What are the possible causes of OBDII code U1173 in a Pontiac indicating lost communications with the power roof module?

- The code U1173 can be triggered by issues such as faulty wiring connections, a defective power roof module, or a malfunctioning communication network.

3. How can I diagnose the cause of OBDII code U1173 in my Pontiac for the power roof module communication error?

- Diagnosing the issue may involve checking the wiring connections, inspecting the power roof module for any visible damage, and using a scan tool to analyze communication signals.

4. Is it safe to continue driving my Pontiac with OBDII code U1173 present for the power roof module communication error?

- It is recommended to address the issue promptly to avoid potential safety hazards and further damage to the power roof system.

5. What are some repair tips for fixing OBDII code U1173 in a Pontiac due to lost communications with the power roof module?

- Repair tips may include checking and repairing any damaged wiring, replacing the power roof module if necessary, and resetting the system after repairs are made.

6. Can a DIY enthusiast resolve OBDII code U1173 in a Pontiac related to the power roof module communication issue?

- DIY enthusiasts with automotive repair experience may be able to address the issue by following repair guides, but professional diagnosis and repair are recommended for complex electrical problems.

7. How much can I expect to pay to fix OBDII code U1173 in a Pontiac caused by lost communications with the power roof module?

- The cost of repairs for code U1173 can vary depending on the extent of the issue, but it may involve expenses for parts replacement, labor, and diagnostic services.

8. Are there any preventive measures to avoid encountering OBDII code U1173 in a Pontiac due to power roof module communication problems?

- Regular maintenance checks, ensuring proper wiring connections, and addressing any minor issues promptly can help prevent the occurrence of code U1173 and related problems.

9. Will resetting the OBDII system clear code U1173 in a Pontiac for the power roof module communication error?

- Resetting the OBDII system may temporarily clear the code, but it is essential to diagnose and fix the underlying issue to prevent the code from reappearing.

10. Can extreme weather conditions or water damage contribute to triggering OBDII code U1173 in a Pontiac associated with the power roof module communication failure?

- Yes, extreme weather conditions, water ingress, or moisture exposure can potentially cause electrical issues leading to code U1173, so it's crucial to protect the vehicle from such elements.

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