AutoCodes – GMC – U0134 GMC

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

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Rear Power Steering Control Module, Rear Power Steering Control Module harness is open or shorted, Rear Power Steering Control 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: U0134 GMC indicates Lost Communication With Rear Power Steering Control Module.
Common causes: Common causes include Faulty Rear Power Steering Control Module, Rear Power Steering Control Module harness is open or shorted, Rear Power Steering Control 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 558

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 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0134 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Rear Power Steering Control Module has not been received.

OBDII Code U0134 GMC - Lost Communication With Rear Power Steering Control Module - AutoCodes.com — U0134 GMC Code - Lost Communication With Rear Power Steering Control Module

What does this mean?

What are the Possible Causes of the DTC U0134 GMC?

Faulty Rear Power Steering Control Module
Rear Power Steering Control Module harness is open or shorted
Rear Power Steering Control Module circuit poor electrical connection

How to Fix the DTC U0134 GMC?

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 U0134 GMC 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 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.