Restore Critical Towing Safety and Control
When you’re hauling a heavy load, the last thing you need is a dashboard warning light and the uncertainty of whether your trailer brakes will respond. A failing Trailer Brake Control Module (TBCM) can be a source of major stress, displaying messages like “Service Trailer Brake System” and compromising your safety on the road. This isn’t just an annoyance; it’s a critical failure that demands a reliable solution. Get back to towing with complete confidence with this direct-fit, VIN-programmed 2007-2009 Sierra Silverado Trailer Brake Control Module, designed to restore your truck’s integrated braking system to perfect working order.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty TBCM is the most likely culprit. This module is the definitive solution for:
- “Service Trailer Brake System” message on the Driver Information Center (DIC)
- “Trailer Connected” / “Trailer Disconnected” messages cycling intermittently
- No output or erratic output to the trailer’s electric brakes
- Diagnostic Trouble Codes (DTCs) related to the TBCM, such as C0561
- The manual trailer brake lever not responding
Don’t settle for a generic part that requires an expensive trip to the dealership for programming. We take care of the most crucial step for you. By providing your VIN at checkout, you receive a module that is flashed with the latest GM software specific to your truck’s configuration, making installation a true plug-and-play process.
Features & Benefits
- ✔ VIN-Programmed for Your Truck: Arrives ready for installation with the latest GM updates, completely eliminating the need for a dealer visit.
- ✔ Restores Full Functionality: Clears persistent dash warnings and restores precise, reliable control over your trailer’s brakes.
- ✔ Direct-Fit Replacement: Engineered to be a perfect match for the original module (replaces part numbers 20850923, 25854535, 25788981, 25907533), ensuring a seamless fit.
- ✔ Enhanced Towing Safety: Regain the peace of mind that comes from knowing your integrated braking system is working exactly as the factory intended.
- ✔ Cost-Effective Solution: Save hundreds of dollars in dealership programming fees and labor costs with this all-in-one solution.
- ✔ Warranty Protection: This unit is backed by our one-year replacement warranty.
Expert Insight from a Seasoned Tech
“I’ve seen it countless times. A driver is heading down a steep grade, and that’s when they discover their trailer brake controller isn’t responding correctly. It’s a terrifying feeling. The factory integrated system in these GM trucks is excellent, but the TBCM is a common point of failure due to its location on the frame rail, exposed to the elements. The key to a successful repair isn’t just replacing the part—it’s ensuring it’s programmed correctly. An unprogrammed module is just a paperweight. This pre-flashed 2007-2009 Sierra Silverado Trailer Brake Control Module is the only way I’d do this job in my own bay. It’s safe, it’s reliable, and it gets the truck back to work without the dealership hassle.”
Frequently Asked Questions
How does the VIN programming process work?
It’s simple. After you complete your purchase, you provide us with your vehicle’s 17-digit VIN. Our technicians then use official GM equipment to load the latest, vehicle-specific software and calibrations onto the module. It ships to you ready to be installed, no further steps required.
Will this fix the ‘Service Trailer Brake System’ message?
Yes. In the vast majority of cases, this warning message is caused by a failing TBCM. Replacing your old module with this correctly programmed unit is the definitive fix for this common issue.
Is this a direct fit for my truck?
This module is a guaranteed fit for 2007-2009 Sierra 2500/3500 & Silverado 2500/3500, as well as 2008-2009 Sierra/Silverado 1500 and Sierra Denali models equipped with the factory towing control option. It is a direct replacement for the original part.
Where is this module located on my truck?
The Trailer Brake Control Module is typically located on the driver’s side frame rail, towards the rear of the truck, near the spare tire. It’s held in place by a few bolts and has an electrical connector.
What happens if I forget to provide my VIN?
Providing your VIN is a required step for this part. We cannot ship the module until we have programmed it, as an unprogrammed module will not function in your vehicle. We will contact you after your purchase to ensure we get the necessary information.
Are any other part numbers compatible?
Yes, this module is a direct replacement for several part numbers, including 20850923, 25854535, 25788981, and 25907533. If your original module has any of these numbers, this part will work for you.