Stop Staring at the ‘Service Trailer Brake System’ Light and Start Towing with Confidence
There’s nothing more frustrating for a truck owner than seeing a warning light that compromises your vehicle’s core capability. If the “Service Trailer Brake System” message is lit up on your dash, or your trailer brakes are acting erratically, you know you have a problem that can’t be ignored. It’s not just an annoyance; it’s a critical safety issue that puts your truck, your trailer, and your cargo at risk. This isn’t the time for guesswork. You need a reliable, direct-fit solution that gets you back on the road safely and without a time-consuming, expensive trip to the dealership. This is that solution.
Common Symptoms & Your Direct-Fit Solution
A failing TBCM can manifest in several ways, but they all point to one thing: a loss of control and safety when you need it most. If you’re experiencing any of the following, it’s a clear sign that your factory module has failed:
- Persistent “Service Trailer Brake System” message on the Driver Information Center (DIC).
- Trailer brakes not applying, or applying intermittently.
- The gain control on your dash is unresponsive or shows an error.
- Diagnostic Trouble Codes (DTCs) such as C1514, C1524, or other related towing system faults.
This professionally programmed 25907533 Trailer Brake Control Module is the definitive answer to these problems. We take a genuine, reliable module and flash it with the latest GM software specifically matched to your truck’s Vehicle Identification Number (VIN). This means it arrives at your door ready to be installed, communicating perfectly with your truck’s other systems right out of the box.
Features & Benefits
- ✔ VIN-Programmed for Your Truck: We flash the module with your specific VIN before shipping, ensuring 100% correct communication and functionality.
- ✔ Eliminate Dealer Visits: This module is a true plug-and-play solution. No need to pay for expensive diagnostic and programming labor at a dealership.
- ✔ Restore Critical Safety: Regain full, reliable control over your trailer’s braking system for safe and predictable stops under any load.
- ✔ Direct-Fit OEM Compatibility: Engineered to meet or exceed original equipment specifications for a perfect fit and seamless integration. This module is a direct replacement for part numbers 20850923, 25854535, 25788981, and 25907533.
- ✔ Clear Annoying Warnings: Installing this module will resolve the electronic faults that trigger the persistent “Service Trailer Brake System” message.
- ✔ One-Year Protection: This unit is backed by our one-year replacement warranty.
An Expert’s Note on Programming: Many people don’t realize that a new Trailer Brake Control Module is just a paperweight until it’s programmed. A generic, un-programmed module from a parts store won’t communicate with your truck’s Body Control Module (BCM) or Engine Control Module (ECM). You’d still have to get the truck towed or driven to a dealer for a costly programming session. Our service handles that critical step for you. By sending us your VIN, you’re getting a part that is truly ready for the job, saving you an estimated $150-$250 in programming fees and a full day of vehicle downtime.
Frequently Asked Questions
How does the VIN programming process work?
It’s simple. After you complete your purchase, you will need to send us your 17-digit VIN. Our technicians will use this number to load the correct, vehicle-specific GM software onto the 25907533 Trailer Brake Control Module. We then ship the fully programmed part to you.
Is this part difficult to install?
The module is located on the driver’s side rear frame rail. For someone with mechanical experience, it is a straightforward bolt-off, bolt-on process with a single electrical connector. However, we always recommend professional installation if you are not comfortable working on your vehicle.
Will this fix the “Service Trailer Brake System” message for good?
Yes, provided the module itself is the cause of the problem, which it is in the vast majority of cases with these symptoms. This part is designed to resolve the internal electronic faults that trigger that specific warning.
What if my old module has a different part number?
No problem. GM often updates part numbers over time. This module is a direct, compatible replacement for several part numbers, including 20850923, 25854535, 25788981, and 25907533. As long as your vehicle is listed in the fitment guide, this part will work.
Is any additional programming required after I install it?
Absolutely not. That is the primary benefit of our service. The module arrives fully programmed and ready to function the moment it’s installed. You can clear any old codes with a standard scanner, and you’ll be ready to tow.
Where is this module located on my truck?
You will find the Trailer Brake Control Module mounted to the inside of the frame, on the driver’s side (LH), typically above or near the rear axle.