Restore Safe Towing and Clear That Annoying Dashboard Warning
Seeing the “Service Trailer Brake System” message on your dash is more than an inconvenience—it’s a critical safety alert that your truck can’t reliably control your trailer’s brakes. This puts you, your cargo, and everyone else on the road at risk. When you depend on your Silverado or Sierra HD for serious work, you can’t afford that kind of uncertainty. Get back to towing with absolute confidence by replacing your faulty unit with our professionally programmed trailer brake control module 20964299.
Common Symptoms & Your Direct-Fit Solution
If you’re experiencing any of the following issues, a failing Trailer Brake Control Module (TBCM) is the most likely cause:
- Persistent “Service Trailer Brake System” message on the Driver Information Center (DIC).
- “Trailer Connected” / “Trailer Disconnected” messages cycling randomly.
- No output or erratic, jerky output to the trailer brakes.
- Diagnostic Trouble Codes (DTCs) such as C151C, C152D, or U0100 stored in the system.
- The manual trailer brake slider/switch is unresponsive.
This module is the definitive solution. We take a genuine OEM-spec unit and flash it with the latest GM software, specifically calibrated to your truck’s unique Vehicle Identification Number (VIN). This isn’t a generic, one-size-fits-all part; it’s a precision component prepared for your exact vehicle, ensuring all systems communicate and function as the factory intended.
Features & Tangible Benefits
- ✔ VIN-Programmed for Your Truck: Simply provide your VIN after purchase, and we handle the complex programming. This ensures perfect compatibility and function right out of the box.
- ✔ True Plug-and-Play Installation: Because the programming is done, you can skip the expensive trip to the dealership for calibration. Just install the module, and you’re ready to tow.
- ✔ Restores Critical Safety: Regain precise, reliable control over your trailer’s brakes for safer stops and better handling, especially with heavy loads.
- ✔ Clears Dashboard Warnings: Eliminate the persistent and distracting “Service Trailer Brake System” error message for good.
- ✔ Direct OEM-Spec Fitment: Designed to replace part numbers 20964299 and 20850923, guaranteeing a perfect fit in the factory location on the frame rail.
- ✔ Cost-Effective Solution: Avoid the high costs of a dealership diagnosis, programming fees, and inflated part prices. This is the smart, efficient fix.
- ✔ This unit is backed by our one-year replacement warranty.
An Expert’s Note on VIN Programming
“In my 20 years of diagnostics, I’ve seen countless issues arise from using non-programmed modules. On these GM trucks, the TBCM doesn’t just operate the brakes; it integrates with the ABS, stability control (StabiliTrak), and powertrain control modules. Proper VIN programming ensures these systems work in harmony for features like trailer sway control and grade braking. A generic module can’t do that. By sending you a fully programmed trailer brake control module 20964299, we’re not just selling you a part; we’re delivering a complete, integrated solution that maintains the safety and engineering integrity of your truck.”
Don’t let a faulty module compromise your truck’s most important capability. This is the most reliable and straightforward way to get your heavy-duty truck back to work safely. By providing a properly programmed trailer brake control module 20964299, we eliminate the guesswork and extra steps, getting you back on the road faster.
Frequently Asked Questions
What is the process for VIN programming?
It’s simple! After you complete your purchase, just send us a message with your 17-digit VIN. Our technicians will use this to flash the module with the correct software and calibration files for your specific vehicle before it ships.
Is this a direct replacement for part number 20850923?
Yes, this module is a fully compatible and direct replacement for both 20964299 and 20850923, covering all specified applications.
Will this fix the “Service Trailer Brake System” message?
In the vast majority of cases, a faulty TBCM is the root cause of this specific warning message. Replacing it with our pre-programmed unit is the correct and intended repair to resolve the error.
Do I need any special tools for installation?
No special tools are required. Installation typically involves basic hand tools like a socket set to unbolt the module from the frame and a tool to release the electrical connector clips. It’s a very straightforward process for a DIYer or any professional mechanic.
Where is the TBCM located on my truck?
On the 2013-2014 Silverado and Sierra pickups, the module is typically mounted on the driver’s side frame rail, towards the rear of the truck. On the 2013 Suburban 2500 and Yukon XL 2500, it’s located on the driver’s side, near the middle of the frame.