Are you battling mysterious electrical problems in your GMC Sierra, Chevy Silverado, or another GM truck? When power windows fail, the security system acts up, or your dashboard lights up with warnings, a faulty Body Control Module (BCM) is often the culprit. The BCM is the central command for your vehicle’s body electronics, and when it fails, it can create a cascade of frustrating and seemingly unrelated issues. This genuine GM Body Control Module, part number 25844480, is the definitive solution, arriving pre-programmed to your vehicle’s VIN for a hassle-free, plug-and-play installation.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-functional power windows, door locks, or interior/exterior lights.
- ✔ HVAC system malfunctions, such as an unresponsive blower motor or incorrect temperature control.
- ✔ An illuminated airbag warning light, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Vehicle security system errors, leading to anti-theft activation or no-start conditions.
- ✔ Unexplained parasitic battery drain that kills your battery overnight.
- ✔ A flood of communication-related error codes stored in the vehicle’s computer system.
The Plug-and-Play Advantage for Your Sierra 3500 Body Control Module
Don’t waste time and money on a trip to the dealership for programming. We handle the complex part for you. Before this module ships, we flash it with the latest GM software and program it specifically to your truck’s Vehicle Identification Number (VIN). This critical step ensures that the new BCM communicates flawlessly with your engine computer, transmission module, and other onboard systems right out of the box. This direct-fit Sierra 3500 Body Control Module is the fastest way to get your truck back to 100% operational condition.
Installation is straightforward for any DIY mechanic. The BCM is typically located under the driver’s side dashboard near the steering column. Simply disconnect the negative battery terminal, unplug the electrical connectors from the old module, swap in the new one, and reconnect everything. While the physical installation takes minutes, be aware of potential post-installation procedures. If the airbag warning light appears, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ function. Additionally, a ‘Brake Pedal Position Relearn’ may be necessary on some models to ensure proper brake light and traction control operation.
Frequently Asked Questions
What does the Body Control Module do on my truck?
The BCM is a computer that manages and monitors a wide range of your truck’s non-engine related electronic systems. This includes power windows, door locks, the security system, interior and exterior lighting, wipers, and the climate control (HVAC) system.
Is this BCM ready to install when I receive it?
Yes. This module is fully programmed to your vehicle’s VIN before it is shipped. This makes the installation plug-and-play and eliminates the need for expensive programming at a dealership.
Will this part fix my airbag light?
A faulty BCM is a common cause of an airbag light with code B1001. Replacing it often solves the problem. However, if the light stays on after installation, the system needs to be re-synced using a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure.
Where is the BCM located on a 2008 GMC Sierra?
On most 2007-2013 GM trucks and SUVs, including the GMC Sierra, the BCM is found under the driver’s side of the dashboard, usually attached to a bracket near the steering column. It is a black plastic box with multiple large wiring harnesses connected to it.
Do I have to send my old BCM back?
No, there is no core charge associated with this part. You can keep your old module without any penalty.
My original part number is 25823558. Will this 25844480 part work?
Absolutely. Part number 25844480 is a genuine GM service part that supersedes and is interchangeable with a long list of previous part numbers, including 25823558, 25835966, 15943678, and many others listed in the fitment guide. We guarantee compatibility.