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Engine-Codes – GMC – U0134 GMC

U0134 GMC Code - Lost Communication With Rear Power Steering Control Module

Quick Answer

The U0134 GMC code indicates that there is a communication problem between the vehicle's main computer system and the rear power steering control module. Common causes include Faulty rear power steering control module, Wiring issues or loose connections between the main computer system and the control module, Software glitches or communication errors within the vehicle's network. 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
U0134 GMC indicates Lost Communication With Rear Power Steering Control Module.
Common causes
Common causes include Faulty rear power steering control module, Wiring issues or loose connections between the main computer system and the control module, Software glitches or communication errors within the vehicle's network.
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 Sep 13, 2024
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Code U0134 GMC Description

The U0134 GMC code indicates that there is a communication problem between the vehicle's main computer system and the rear power steering control module. This module is responsible for controlling the rear power steering system, which assists in steering the vehicle and improving handling, especially at lower speeds. When communication is lost with this module, it can lead to issues with the power steering system, potentially affecting the vehicle's steering performance and overall drivability.

OBDII Code U0134 GMC - Lost Communication With Rear Power Steering Control Module
U0134 GMC Code - Lost Communication With Rear Power Steering Control Module

Common Causes of U0134 GMC

  1. Faulty rear power steering control module
  2. Wiring issues or loose connections between the main computer system and the control module
  3. Software glitches or communication errors within the vehicle's network
  4. Malfunctioning main computer system or power steering system components
  5. Environmental factors such as water damage or corrosion affecting the connections

Symptoms of U0134 GMC

  1. Erratic steering behavior
  2. Difficulty steering, especially at lower speeds
  3. Power steering warning light illuminated on the dashboard
  4. Unresponsive power steering system
  5. Vehicle pulling to one side while driving

How to Fix U0134 GMC

  1. Begin by conducting a thorough inspection of the wiring harness and connections between the main computer system and the rear power steering control module. Look for any signs of damage, corrosion, or loose connections.
  2. Use a diagnostic scanner to retrieve any stored trouble codes and perform a reset of the system to see if the communication can be reestablished.
  3. If the issue persists, consider replacing the rear power steering control module with a new or refurbished unit. Ensure that the replacement module is compatible with the vehicle's make and model.
  4. Test the power steering system after the replacement to verify that the communication has been restored and that the steering functions properly.
  5. Clear any remaining trouble codes and perform a final test drive to confirm that the issue has been resolved and that the power steering system is functioning as expected.

Cost to Fix U0134 GMC

The typical repair costs for addressing a U0134 GMC code can vary depending on the specific cause of the communication issue. In general, replacing a rear power steering control module can range from $200 to $500, including parts and labor. However, additional diagnostic time and labor costs may apply, and rates can vary based on the location, vehicle make and model, and the shop's hourly rates. It is recommended to consult with a professional mechanic or auto repair shop for a more accurate cost estimate based on the specific circumstances.

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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 U0134 GMC Code

1. What are the common symptoms of OBDII code U0134 in a GMC vehicle?

- Common symptoms include loss of power steering, illuminated warning lights on the dashboard, and difficulty controlling the rear power steering system.

2. What can cause the OBDII code U0134, indicating lost communication with the Rear Power Steering Control Module in a GMC?

- Possible causes include faulty wiring or connections, a malfunctioning power steering control module, or issues with the vehicle's network communication system.

3. How can I diagnose the source of the communication loss with the Rear Power Steering Control Module in my GMC?

- A thorough inspection of wiring, connectors, and the power steering control module is recommended. Using a diagnostic scanner to retrieve additional trouble codes can also help pinpoint the issue.

4. Is it safe to drive my GMC with the U0134 code related to the Rear Power Steering Control Module communication loss?

- It is not recommended to drive the vehicle with this code present, as it can affect the power steering system's functionality, potentially compromising the vehicle's safety and drivability.

5. Can I repair the U0134 code related to the Rear Power Steering Control Module issue in my GMC myself?

- While some basic troubleshooting like checking connections and fuses can be done by DIY enthusiasts, diagnosing and repairing complex electrical system issues may require professional expertise.

6. How much does it typically cost to repair the U0134 code indicating communication loss with the Rear Power Steering Control Module in a GMC?

- Repair costs can vary depending on the root cause of the issue. On average, expect to pay between $200 to $600 for parts and labor, but this can differ based on the specific circumstances.

7. Are there any preventive measures to avoid encountering the U0134 code in a GMC due to communication problems with the Rear Power Steering Control Module?

- Regularly inspecting and maintaining the vehicle's electrical connections, wiring, and power steering system can help prevent issues that may lead to the U0134 code.

8. Can a low battery voltage or a weak alternator cause the U0134 code in a GMC related to the Rear Power Steering Control Module communication loss?

- Yes, low battery voltage or a failing alternator can disrupt the communication between modules in the vehicle, potentially triggering the U0134 code.

9. Will resetting the OBDII code U0134 related to the Rear Power Steering Control Module fix the issue in my GMC?

- Simply clearing the code without addressing the underlying problem will not resolve the communication loss issue. Proper diagnosis and repairs are necessary to fix the root cause.

10. How long does it typically take to repair the U0134 code associated with the Rear Power Steering Control Module communication loss in a GMC?

- The repair time can vary based on the complexity of the issue. In general, expect the repair to take a few hours to a full day, depending on the extent of the diagnosis and repairs needed.

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