Restore Your GM Truck’s Electrical System
Are you battling frustrating electrical issues in your Chevrolet Silverado, GMC Sierra, or Tahoe? Flickering lights, a dead HVAC blower, or power windows with a mind of their own are common signs of a failing Body Control Module (BCM). The BCM acts as the central command center for your vehicle’s body electronics, and when it fails, it can cause a cascade of confusing and disruptive problems. This genuine GM Body Control Module, part number 25844480, is the definitive solution to restore full functionality and reliability to your vehicle.
From the Diagnostic Bay
We had a 2011 Silverado 2500 roll in with a classic case of BCM failure. The customer complained of the radio turning off randomly, the driver’s side power window not working, and an intermittent airbag light. After ruling out wiring and switch issues, we pinpointed the BCM. Instead of sending him to a dealership for a costly replacement and programming session, we installed one of our VIN-programmed modules. In under 10 minutes, the new BCM was in, and every single issue was resolved on the spot. The customer was back on the road without the typical dealership hassle and expense.
Symptoms of a Failing Body Control Module
- ✔ Intermittent or non-functional HVAC controls and blower motor.
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights staying on, flickering, or failing to turn on.
- ✔ An active airbag warning light, often with DTC B1001.
- ✔ Security system malfunctions, causing no-start or stalling conditions.
- ✔ A variety of seemingly unrelated diagnostic trouble codes (DTCs).
Why Choose Our Programmed GMC Sierra BCM?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The biggest challenge when replacing a modern BCM is the need for expensive, vehicle-specific programming. We eliminate that step entirely. Simply provide your vehicle’s VIN during checkout, and we will program the module with the latest GM software updates specific to your truck or SUV. This ensures perfect communication between modules and restores all factory functions as intended.
Installation is straightforward for any DIY mechanic. The BCM is typically located under the driver’s side dash near the steering column and can be swapped out in minutes. While the module is plug-and-play for most functions, please be aware of potential post-installation procedures:
- Airbag System Sync: If the airbag warning light remains on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure correct brake light and traction control operation.
This module is a direct replacement for a wide range of part numbers, including 25823559, 25835966, 15943678, 20939137, and 22860591, among others. With a one-year warranty and no core charge, you can make your repair with confidence and convenience.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means this module arrives ready for a plug-and-play installation. We pre-load it with your vehicle’s specific software, so you can avoid a costly and time-consuming trip to the dealership for programming.
Will this BCM fix my airbag light?
A faulty BCM is a common cause of an airbag light with code B1001. Replacing it often solves the issue, but you may need to perform the ‘Setup SDM Primary Key’ procedure with a high-level scan tool to sync the modules and clear the light.
Where is the BCM located on my 2013 Sierra Denali 2500?
The Body Control Module is located under the driver’s side of the dashboard, typically mounted near the steering column for easy access.
Is this a new or used part?
This is a high-quality, OEM-standard component that has been thoroughly tested to ensure it meets or exceeds factory specifications for performance and reliability. It is backed by our one-year warranty.
Do I need to return my old BCM?
No. We do not require you to return your original part. There is no core charge associated with this purchase, making the process faster and more convenient for you.