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Engine-Codes – GMC – U0136 GMC

U0136 GMC Code - Lost Communication With Rear Differential Control Module

Quick Answer

The U0136 diagnostic trouble code (DTC) for GMC vehicles indicates that there is a communication issue with the Rear Differential Control Module (RDCM). Common causes include Corrosion or damage to wiring harnesses or connectors related to the RDCM, A faulty Rear Differential Control Module, Issues with the vehicle's CAN bus communication system. 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
U0136 GMC indicates Lost Communication With Rear Differential Control Module.
Common causes
Common causes include Corrosion or damage to wiring harnesses or connectors related to the RDCM, A faulty Rear Differential Control Module, Issues with the vehicle's CAN bus communication system.
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 U0136 GMC Description

The U0136 diagnostic trouble code (DTC) for GMC vehicles indicates that there is a communication issue with the Rear Differential Control Module (RDCM). This module is responsible for managing the rear differential, which is a crucial component of the vehicle's drivetrain system. The rear differential allows the wheels to rotate at different speeds while maintaining power delivery from the engine to the wheels.

OBDII Code U0136 GMC - Lost Communication With Rear Differential Control Module
U0136 GMC Code - Lost Communication With Rear Differential Control Module

Common Causes of U0136 GMC

  1. Corrosion or damage to wiring harnesses or connectors related to the RDCM.
  2. A faulty Rear Differential Control Module.
  3. Issues with the vehicle's CAN bus communication system.
  4. Software glitches or malfunctions within the vehicle's electronic control modules.
  5. Water intrusion or physical damage to the RDCM.

Symptoms of U0136 GMC

  1. Illumination of the traction control or stability control warning lights on the dashboard.
  2. Loss of traction control or stability control functionality.
  3. Abnormal noises or vibrations coming from the rear of the vehicle.
  4. Difficulty engaging or disengaging the rear differential lock (if equipped).
  5. Decreased fuel efficiency or drivability issues.

How to Fix U0136 GMC

  1. Begin by conducting a thorough visual inspection of the wiring harnesses and connectors related to the RDCM. Repair or replace any damaged or corroded components.
  2. Use a diagnostic scan tool to communicate with the RDCM and check for any stored fault codes or communication errors.
  3. If necessary, replace the Rear Differential Control Module with a new unit and program it to the vehicle.
  4. Clear the DTC from the vehicle's memory using the diagnostic scan tool.
  5. Perform a road test to verify that the issue has been resolved and that all systems are functioning properly.

Cost to Fix U0136 GMC

The typical repair costs for addressing a U0136 code related to a lost communication with the Rear Differential Control Module can range from $200 to $600, including parts and labor. However, it is important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may charge less. It is recommended to check local rates for a more accurate estimate of repair costs.

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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 U0136 GMC Code

1. What are the common symptoms of OBDII code U0136 GMC (Lost Communication With Rear Differential Control Module)?

- Common symptoms include the malfunction indicator light (MIL) illuminating on the dashboard, issues with the rear differential control, and potential drivability problems.

2. What are the possible causes of the U0136 code in a GMC vehicle?

- The U0136 code can be triggered by issues such as a faulty rear differential control module, damaged wiring or connectors, communication network problems, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the U0136 code in my GMC vehicle?

- Diagnosing the U0136 code involves using a diagnostic scanner to retrieve the trouble codes, checking the rear differential control module for any visible damage, inspecting wiring and connectors for signs of wear or corrosion, and testing the communication network.

4. What are some repair tips for fixing the U0136 code in a GMC vehicle?

- Repair tips include checking and repairing any damaged wiring or connectors, replacing the rear differential control module if necessary, ensuring proper communication network connections, and clearing the trouble codes after repairs are completed.

5. Can I drive my GMC vehicle with the U0136 trouble code present?

- It is not recommended to drive your vehicle with the U0136 code active, as it can lead to further damage and potential safety issues. It is best to address the issue promptly to avoid any complications.

6. How much does it typically cost to repair the U0136 code in a GMC vehicle?

- The cost of repairing the U0136 code can vary depending on the specific cause of the issue, parts needed for replacement, labor costs, and whether you choose to address the problem yourself or take it to a professional mechanic.

7. Is the U0136 code a common issue in GMC vehicles?

- The U0136 code related to lost communication with the rear differential control module is not as common as some other OBDII codes, but it can still occur in GMC vehicles due to various factors like electrical issues or module failures.

8. Can a DIY enthusiast fix the U0136 code issue in a GMC vehicle?

- Depending on your experience and knowledge of automotive repairs, you may be able to address the U0136 code yourself by following diagnostic procedures, checking for common causes, and making necessary repairs or replacements.

9. Are there any recalls related to the U0136 code in GMC vehicles?

- Recalls specific to the U0136 code in GMC vehicles are not common, but it's always a good idea to check with the manufacturer or local dealership to see if there are any related recalls or technical service bulletins.

10. How can I prevent the U0136 code from occurring in my GMC vehicle in the future?

- To prevent the U0136 code from occurring, you can perform regular maintenance checks on your vehicle, address any electrical issues promptly, avoid water damage to the rear differential control module, and ensure proper wiring connections are secure.

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