Is your GM truck or SUV suffering from strange electrical issues? You’re not alone.
The Body Control Module (BCM) is the central command center for your vehicle’s body electronics. When it begins to fail, it can cause a cascade of frustrating and seemingly unrelated problems. From power windows that won’t budge to a security system that acts up, a faulty BCM can make your reliable truck feel unpredictable. This genuine quality GM Body Control Module, part number 25844480, is the definitive solution to restore full electrical functionality to your vehicle.
What sets our modules apart is the crucial pre-programming service. We flash the unit with the latest GM software and program it specifically to your vehicle’s VIN before it ships. This means no expensive trips to the dealership for coding or setup. It arrives at your door ready for a true plug-and-play installation, getting you back on the road faster.
From the Diagnostic Bay
We had a 2013 Sierra 3500 come in with the owner at his wit’s end. The radio would turn on by itself, the driver’s side power lock was dead, and the HVAC blower was intermittent. He’d already replaced the lock actuator and checked fuses, suspecting a complex wiring nightmare. After a quick scan, we saw multiple communication codes pointing to one culprit. Instead of hours chasing wires, we installed a VIN-programmed BCM. In under 10 minutes, every single issue was resolved. It’s a classic case of what looks like multiple failures being a single module problem.
Symptoms of a Failing Sierra 3500 Body Control Module
- ✔ Unresponsive or erratic power windows, door locks, and interior/exterior lights.
- ✔ HVAC system malfunctions, such as the blower motor not working or temperature controls failing.
- ✔ The security system engaging randomly, causing a no-start condition or stalling.
- ✔ An active airbag warning light, often accompanied by diagnostic trouble code (DTC) B1001.
- ✔ Intermittent wiper operation or wipers that won’t turn off.
- ✔ False warnings on the instrument cluster or messages like “Service 4WD”.
Installation and Post-Install Procedures
Replacing the BCM is surprisingly straightforward. It’s typically located under the driver’s side dashboard, near the steering column. The physical swap takes just a few minutes. However, be aware of a couple of potential post-installation steps:
- Airbag System Sync: If the airbag light remains on after installation, a technician will need to perform the “Setup SDM Primary Key in BCM” procedure using a professional scan tool. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: In some cases, a brake pedal position sensor relearn may be required to ensure correct brake light and stability control operation.
This module is a direct replacement for a wide range of GM trucks and SUVs from 2007-2013, including the Chevrolet Silverado, Tahoe, Suburban, Avalanche, and Cadillac Escalade. It interchanges with numerous part numbers, including 25823559, 25835966, 15943678, 20939137, and 22860591, ensuring broad compatibility.
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. We pre-program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation, saving you time and the cost of dealer programming.
Where is the BCM located on my 2013 Sierra?
The Body Control Module is typically found under the driver’s side of the dashboard, often near the steering column or integrated into the fuse box area.
Will this fix my airbag light with a B1001 code?
A faulty BCM is a very common cause of the B1001 code. Replacing it often resolves the issue, but you may need to perform the “Setup SDM Primary Key” procedure with a scan tool to clear the light after installation.
Is this a new or used part?
This is a high-quality, OEM-standard component that has been expertly tested and prepared with fresh programming for your vehicle, backed by a one-year warranty.
What if my original part number is different?
This module, 25844480, is a direct replacement for many part numbers, including 25823559, 25835966, and others listed in the description. As long as your vehicle is listed in the compatibility chart, this programmed module will work correctly.