U0137 GMC Code - Lost Communication with Trailer Brake Control Module
Quick Answer
The U0137 GMC code indicates that there is a communication error between the vehicle's main computer system and the Trailer Brake Control Module. Common causes include Faulty wiring connections between the main computer system and the Trailer Brake Control Module, Damaged Trailer Brake Control Module, Corrosion on electrical connectors. 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 GMC indicates Lost Communication with Trailer Brake Control Module.
- Common causes
- Common causes include Faulty wiring connections between the main computer system and the Trailer Brake Control Module, Damaged Trailer Brake Control Module, Corrosion on electrical connectors.
- 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 U0137 GMC Description
The U0137 GMC code indicates that there is a communication error between the vehicle's main computer system and the Trailer Brake Control Module. This module is responsible for controlling the trailer brakes when towing a trailer. When communication is lost with this module, it can lead to issues with the trailer brake system, potentially affecting the vehicle's ability to brake safely while towing.
Common Causes of U0137 GMC
- Faulty wiring connections between the main computer system and the Trailer Brake Control Module.
- Damaged Trailer Brake Control Module.
- Corrosion on electrical connectors.
- Issues with the vehicle's main computer system.
- Software glitches in the vehicle's communication system.
Symptoms of U0137 GMC
- Trailer brakes not responding properly when towing.
- Trailer brake warning light illuminated on the dashboard.
- ABS (Anti-lock Braking System) warning light on.
- Loss of trailer brake functionality.
- Inability to control trailer braking intensity.
How to Fix U0137 GMC
- Begin by inspecting the wiring connections between the main computer system and the Trailer Brake Control Module. Look for any signs of damage, corrosion, or loose connections. Repair or replace any damaged wiring as needed.
- Test the Trailer Brake Control Module to determine if it is functioning properly. If the module is faulty, it will need to be replaced.
- Check for any software updates for the vehicle's communication system. Updating the software may resolve any communication errors.
- Clear the diagnostic trouble codes from the vehicle's system using a diagnostic scanner.
- Test the trailer brake system to ensure that communication has been restored and that the brakes are functioning correctly.
Cost to Fix U0137 GMC
The cost of repairing a U0137 GMC code can vary depending on the specific cause of the communication error. In general, the cost of parts for this repair can range from $100 to $500, while labor costs can range from $100 to $300. Overall, the total repair cost for this issue may fall between $200 and $800. It is important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and the extent of the repairs needed. It is recommended to consult with a qualified mechanic to get an accurate cost estimate for this repair.
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Information for Specific GMC Models
- U0137 2014 GMC Sierra — Lost Communication with Trailer Brake Control Module
- U0137 2015 GMC Sierra — Lost Communication with Trailer Brake Control Module
- U0137 2016 GMC Sierra — Lost Communication with Trailer Brake Control Module
- U0137 2017 GMC Sierra — Lost Communication with Trailer Brake Control Module
- U0137 2018 GMC Sierra — Lost Communication with Trailer Brake Control Module
Frequently Asked Questions about U0137 GMC Code
1. What does the OBDII code U0137 mean on a GMC vehicle?
U0137 indicates a loss of communication between the vehicle's main control modules and the Trailer Brake Control Module (TBCM).
2. What are the common symptoms of a U0137 code on a GMC?
Symptoms may include a non-functional trailer brake system, warning lights on the dashboard, and error messages related to trailer brakes.
3. What causes the U0137 code to appear on a GMC?
Common causes include damaged or corroded wiring, a faulty Trailer Brake Control Module, or communication issues with the CAN (Controller Area Network) bus.
4. Can a blown fuse trigger a U0137 code on a GMC?
Yes, a blown fuse related to the TBCM or CAN bus system can disrupt communication and trigger the code.
5. How do you diagnose a U0137 code on a GMC?
Diagnosis involves checking the wiring and connections to the TBCM, testing the CAN bus network for continuity, and inspecting fuses and power supplies.
6. Can a U0137 code on a GMC affect trailer towing?
Yes, the code can disable the trailer brake system, making towing unsafe or impossible in some cases.
7. How do you fix a U0137 code on a GMC?
Repairs may include replacing damaged wiring, cleaning corroded connectors, replacing a faulty TBCM, or reflashing the module software.
8. Is it safe to drive with a U0137 code on a GMC?
While the vehicle may still be drivable, towing with a trailer is not recommended until the issue is resolved.
9. Can a software update fix the U0137 code on a GMC?
In some cases, a software update or reprogramming of the TBCM or other control modules can resolve the communication issue.
10. What tools are needed to troubleshoot a U0137 code on a GMC?
You’ll need an OBDII scanner with CAN bus capabilities, a multimeter for testing electrical connections, and access to the vehicle’s wiring diagrams.
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