Restore Safe and Reliable Towing Power to Your GM Truck
Seeing the dreaded “Service Trailer Brake System” message on your dash? Are your trailer brakes engaging erratically or not at all? Don’t compromise the safety of your load, your vehicle, or yourself. A faulty Trailer Brake Control Module (TBCM) is often the culprit, and this VIN-programmed unit is the definitive, hassle-free solution for your 2011-2012 GM HD truck or SUV. Get back to towing with confidence and complete control.
Common Symptoms & Your Direct-Fit Solution
If you’re experiencing any of the following issues, a failing TBCM is the likely cause. This module is engineered to resolve these problems and restore your vehicle’s factory towing performance.
- “Service Trailer Brake System” warning light on the instrument cluster
- “Trailer Connected” / “Trailer Disconnected” messages cycling on and off
- No output to the trailer’s electric brakes
- Intermittent or weak trailer braking
- Diagnostic Trouble Codes (DTCs) such as C151C, C152C, or U0100
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a genuine GM module and professionally program it with the latest dealer-level software, specifically matched to your truck’s unique Vehicle Identification Number (VIN). This critical step ensures perfect communication between the module and your truck’s other computer systems, a step that is absolutely required for it to function. Our process using the 2011-2012 Sierra Silverado Trailer Brake Control Module 20791897 eliminates the need for an expensive trip to the dealership for programming.
Features & Tangible Benefits
- ✔ VIN-Programmed for Your Truck: Arrives ready for a true plug-and-play installation. No dealer visits, no special tools, no extra programming fees required.
- ✔ Latest GM Software Updates: We flash the module with the most current software from General Motors, ensuring optimal performance and reliability.
- ✔ Restores Full Braking Function: Regain precise, dependable control over your trailer’s brakes for safer stops and descents.
- ✔ Clears Annoying Dash Warnings: Permanently resolve the “Service Trailer Brake System” message and restore your dash to a clean, warning-free state.
- ✔ Direct-Fit OE Replacement: Guarantees a perfect fit and seamless integration with your vehicle’s existing wiring and mounting points on the frame.
- ✔ This unit is backed by our one-year replacement warranty.
An Expert’s Note on Programming: Many truck owners try to save a few dollars by sourcing a used module from a salvage yard, only to find it doesn’t work. That’s because these TBCMs are coded to the specific options and VIN of the original vehicle. Without proper programming, the module simply cannot communicate with your truck’s Body Control Module (BCM) and Engine Control Module (ECM). Our service handles this complex step for you, ensuring the 2011-2012 Sierra Silverado Trailer Brake Control Module 20791897 you receive is a 100% functional, bolt-in fix right out of the box.
Frequently Asked Questions
Is this a simple plug-and-play installation?
Yes. Because we program the module to your specific VIN before shipping, it is a true plug-and-play part. Simply disconnect the old module, mount the new one, plug in the electrical connectors, and you’re done. No further programming is required.
How do I provide you with my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically find your VIN on your driver’s side door jamb sticker, the corner of the dashboard (viewable through the windshield), or on your vehicle’s registration and insurance documents.
Where is this module located on my truck?
For Sierra and Silverado pickups, the module is typically located on the driver’s side frame rail, towards the rear of the truck, often near the spare tire. For Suburban 2500 and Yukon XL 2500 models, it’s usually found on the driver’s side frame rail in the middle of the vehicle.
Will this definitely fix my “Service Trailer Brake System” message?
While a faulty TBCM is the most common cause of this warning on these trucks, other issues like wiring problems or a bad trailer connector can also trigger it. However, if you’ve ruled out external wiring issues, this 2011-2012 Sierra Silverado Trailer Brake Control Module 20791897 is the most probable and effective solution.
What if my original module has a different part number?
This module, part number 20791897, is a compatible replacement for several original part numbers within the specified vehicle range. As long as your vehicle is listed in the fitment chart, this programmed module will work correctly.