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U0137 2018 GMC Sierra Code - Lost Communication with Trailer Brake Control Module

Quick Answer

The U0137 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that there is a communication problem between the vehicle's onboard computer system and the trailer brake control module. Common causes include Faulty wiring connection between the vehicle and the trailer brake control module, Damaged wiring harness, Malfunctioning trailer brake control module. 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
U0137 2018 GMC Sierra indicates Lost Communication with Trailer Brake Control Module.
Common causes
Common causes include Faulty wiring connection between the vehicle and the trailer brake control module, Damaged wiring harness, Malfunctioning trailer brake control module.
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 07, 2024
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Code U0137 2018 GMC Sierra Description

The U0137 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that there is a communication problem between the vehicle's onboard computer system and the trailer brake control module. This module is responsible for controlling the brake systems of a trailer when it is connected to the vehicle. The lost communication can lead to issues with the trailer brake system, potentially affecting the ability to brake effectively while towing a trailer.

OBDII Code U0137 2018 GMC Sierra - Lost Communication with Trailer Brake Control Module
U0137 2018 GMC Sierra Code - Lost Communication with Trailer Brake Control Module

Common Causes of U0137 2018 GMC Sierra

  1. Faulty wiring connection between the vehicle and the trailer brake control module
  2. Damaged wiring harness
  3. Malfunctioning trailer brake control module
  4. Software glitch in the vehicle's computer system
  5. Corrosion or moisture in the connection points

Symptoms of U0137 2018 GMC Sierra

  1. Malfunctioning trailer brake system
  2. Warning lights illuminated on the dashboard
  3. Inability to control trailer brakes while towing
  4. Decreased braking performance while towing
  5. Stability issues while towing a trailer

How to Fix U0137 2018 GMC Sierra

  1. Perform a diagnostic scan to retrieve the specific DTC and identify the root cause of the communication failure.
  2. Inspect the wiring harness and connections between the vehicle and the trailer brake control module for any damage or corrosion. Repair or replace as necessary.
  3. Check the trailer brake control module for proper functionality and replace if found to be faulty.
  4. Clear the DTC from the vehicle's computer system and reset the communication link between the vehicle and the trailer brake control module.
  5. Test the trailer brake system to ensure proper operation and functionality.

Cost to Fix U0137 2018 GMC Sierra

The cost of repairing a U0137 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. However, as a rough estimate, the repair for this issue could range from $150 to $500, including parts and labor. It is important to note that the cost may be higher if a new trailer brake control module is required or if extensive wiring repairs are needed. Additionally, the 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. It's advisable to check with local repair shops for a more accurate cost estimate.

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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 U0137 2018 GMC Sierra Code

1. What does the OBDII code U0137 mean on a 2018 GMC Sierra?

U0137 indicates a loss of communication with the Trailer Brake Control Module (TBCM), meaning the vehicle's system cannot communicate with this module.

2. What are the common symptoms of the U0137 code in a 2018 GMC Sierra?

Symptoms may include the trailer brakes not functioning, a warning message on the dashboard, the trailer brake controller not responding, or intermittent braking issues.

3. What causes the U0137 code to appear on a 2018 GMC Sierra?

Common causes include a faulty Trailer Brake Control Module, damaged wiring or connectors, a blown fuse, or issues with the vehicle's CAN (Controller Area Network) bus system.

4. Can I still drive my 2018 GMC Sierra with the U0137 code?

Yes, you can drive the vehicle, but the trailer brakes may not function correctly, which can compromise safety when towing.

5. How do I diagnose the U0137 code on my 2018 GMC Sierra?

Start by checking for damaged or disconnected TBCM wiring and connectors. Inspect related fuses and ensure the CAN bus network is functional. A scan tool with CAN diagnostics can help pinpoint the issue.

6. How do I fix the U0137 code on a 2018 GMC Sierra?

Repair or replace damaged wiring, connectors, or fuses related to the TBCM. If necessary, replace the Trailer Brake Control Module and clear the code with a scan tool.

7. How much does it cost to fix the U0137 code on a 2018 GMC Sierra?

Repair costs depend on the issue. Replacing the TBCM can range from $200 to $500, while wiring repairs or connector replacements may be less expensive.

8. Can I reset the U0137 code without fixing the issue?

You can clear the code with a scan tool, but it will likely return unless the underlying issue is resolved.

9. What tools are needed to diagnose the U0137 code on a 2018 GMC Sierra?

You’ll need an OBDII scan tool capable of reading U-codes and CAN communication, along with basic tools for inspecting wiring and connectors.

10. Is the U0137 code specific to the 2018 GMC Sierra?

No, the U0137 code can appear on other vehicles that use a Trailer Brake Control Module, but the exact symptoms and solutions may vary by make and model.

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