Stop Guessing and Start Towing Safely Again
Is the “Service Trailer Brake System” message on your dash causing you constant stress every time you hitch up? A faulty Trailer Brake Control Module (TBCM) doesn’t just create annoying alerts; it compromises the safety of you, your truck, and your valuable load. This pre-programmed Trailer Brake Control Module is the definitive, no-hassle solution to restore your truck’s towing capabilities and give you back the confidence you need on the road.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a failing TBCM is the most likely culprit. This module is engineered to resolve these exact problems in your 2007-2009 GM truck:
- Persistent “Service Trailer Brake System” or “Check Trailer Wiring” messages on the Driver Information Center (DIC).
- The trailer brake output display on your dash is blank or shows dashes.
- No power or inconsistent power being sent to your trailer’s electric brakes.
- Diagnostic Trouble Codes (DTCs) such as C0265, C0266, or U0100 stored in the system.
Instead of paying for expensive diagnostic fees and programming charges at a dealership, this module arrives at your door ready for installation. We use your vehicle’s VIN to flash it with the latest, most stable software from GM, ensuring perfect communication with your truck’s existing systems. This is the most efficient way to get your Silverado Sierra trailer brake control module working correctly again.
Features & Benefits
- ✔ VIN-Programmed for Your Truck: Simply provide your VIN at checkout, and we handle the complex programming. This ensures a true plug-and-play installation with no need for a trip to the dealer.
- ✔ Restores Full Functionality: Eliminates error messages and restores proper operation of your integrated trailer brake controller, allowing for safe and controlled stops.
- ✔ Latest GM Software: Your module is loaded with the most recent updates, addressing common bugs and improving performance over the original factory software.
- ✔ Direct-Fit Replacement: Designed to be a perfect match for the original part (replaces part numbers 20850923, 25854535, 25788981, 25907533), guaranteeing a straightforward installation on the driver-side rear frame rail.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty.
An Expert’s Diagnostic Tip
Before you replace your Silverado Sierra trailer brake control module, take a moment to inspect your truck’s 7-pin trailer connector at the bumper. Over time, moisture and road salt can cause severe corrosion inside the connector, leading to short circuits and communication errors that can mimic a failed module. A quick clean with a wire brush and some dielectric grease can sometimes solve the issue. If the problem persists after cleaning, you can be confident that the module itself is the root cause. We believe in helping you fix it right the first time.
Frequently Asked Questions
Do I need to take my truck to the dealer after installing this?
Absolutely not. The main benefit of our service is that we program the module to your specific vehicle’s VIN before we ship it. This means it is ready for installation right out of the box, saving you time and the extra cost of dealership programming.
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, often near the spare tire. It’s mounted to the frame with a small bracket.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the part until we receive and program it with your VIN.
What if my old part number is slightly different?
This module is a direct replacement for several part numbers, including 20850923, 25854535, 25788981, and 25907533. As long as your vehicle is a 2007-2009 GM truck listed in the fitment chart, this programmed module is the correct part for you.
Will this fix the “Service Trailer Brake System” message?
Yes, in the vast majority of cases, a faulty TBCM is the cause of that specific error message. By replacing your old unit with this pre-programmed Silverado Sierra trailer brake control module, you can permanently clear that warning and restore proper system operation.