AutoCodes – GMC – U0137 2015 GMC Sierra

U0137 2015 GMC Sierra Code - Lost Communication with Trailer Brake 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 Trailer Brake Control Module, Trailer Brake Control Module harness is open or shorted, Trailer Brake 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: U0137 2015 GMC Sierra indicates Lost Communication with Trailer Brake Control Module.
Common causes: Common causes include Faulty Trailer Brake Control Module, Trailer Brake Control Module harness is open or shorted, Trailer Brake 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 297

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 Jul 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0137 2015 GMC Sierra 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 need 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) will be set when the device setting the DTC has attempted to establish communications on the serial data circuits more than 3 times in 5 s.

OBDII Code U0137 2015 GMC Sierra - Lost Communication with Trailer Brake Control Module - AutoCodes.com — U0137 2015 GMC Sierra Code - Lost Communication with Trailer Brake Control Module

What does this mean?

What are the Possible Causes of the DTC U0137 2015 GMC Sierra?

Faulty Trailer Brake Control Module
Trailer Brake Control Module harness is open or shorted
Trailer Brake Control Module circuit poor electrical connection

How to Fix the DTC U0137 2015 GMC Sierra?

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 U0137 2015 GMC Sierra 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 U0137 2015 GMC Sierra Code

1. What does the OBDII code U0137 for a 2015 GMC Sierra mean?

The code U0137 indicates a "Lost Communication with Trailer Brake Control Module" error in the vehicle's diagnostic system.

2. What are common symptoms of a U0137 code in a 2015 GMC Sierra?

Common symptoms of a U0137 code may include non-functioning trailer brakes, disabled trailer brake control features, and possibly an illuminated warning light on the dashboard.

3. What are some possible causes of the U0137 code in a 2015 GMC Sierra?

Potential causes of a U0137 code include damaged wiring harnesses, faulty trailer brake control module, poor electrical connections, or a malfunctioning CAN bus communication system.

4. How can I diagnose a U0137 code in my 2015 GMC Sierra?

Diagnosing a U0137 code typically involves using an OBDII scanner to retrieve the code, checking the trailer brake control module for any visible damage, inspecting wiring for breaks or corrosion, and testing electrical connections for proper continuity.

5. How can I repair a U0137 code in my 2015 GMC Sierra?

Repairing a U0137 code may involve repairing or replacing damaged wiring, ensuring proper electrical connections, resetting the control module, or replacing the trailer brake control module if necessary.

6. Can I continue driving my 2015 GMC Sierra with a U0137 code?

It is not recommended to continue driving with a U0137 code, as it may affect the functionality of the trailer brake control system, leading to safety issues when towing a trailer.

7. Will a U0137 code in a 2015 GMC Sierra cause the vehicle to fail an emissions test?

The U0137 code itself is not related to emissions, so it should not cause the vehicle to fail an emissions test directly. However, it is important to address the code to ensure proper functioning of the trailer brake control system.

8. How much does it typically cost to repair a U0137 code in a 2015 GMC Sierra?

The cost of repairing a U0137 code can vary depending on the specific cause of the issue. It may range from a simple repair of wiring or connections to a more costly replacement of the trailer brake control module.

9. Can a U0137 code be triggered by DIY repairs or modifications to the trailer brake system?

Yes, DIY repairs or modifications to the trailer brake system can potentially trigger a U0137 code if the wiring or connections are not properly addressed or if there are compatibility issues with the control module.

10. Is a U0137 code a common issue in 2015 GMC Sierra vehicles?

The U0137 code related to lost communication with the trailer brake control module is not extremely common but can occur in 2015 GMC Sierra vehicles, especially in those used for towing trailers frequently.