Are you battling bizarre electrical problems in your GM truck or SUV? Flickering lights, unresponsive power windows, a dead HVAC system, or random warning lights are classic signs of a failing Body Control Module (BCM). The BCM is the central command for your vehicle’s body electronics, and when it fails, it can cause a cascade of frustrating issues. This VIN-programmed GM 25844480 BCM is the definitive solution, designed for a seamless, plug-and-play installation to restore full functionality to your vehicle.
Common Symptoms of a Failing BCM
- ✔ Unresponsive or erratic power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that won’t turn on or off.
- ✔ HVAC system failures, such as a blower motor that won’t run or incorrect temperature control.
- ✔ An illuminated airbag warning light, often with a DTC B1001 code.
- ✔ Security system malfunctions, causing no-start conditions or random alarm activation.
- ✔ Erratic windshield wiper operation.
Why Choose Our Programmed Sierra 3500 Body Control Module?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We pre-program each module to your vehicle’s specific VIN, loading it with the latest GM software updates. This critical step ensures perfect communication between the BCM and your truck’s other systems, eliminating the need for an expensive trip to the dealership for programming. It’s built to strict OEM standards for reliability and longevity, ensuring it can handle the demands of your workhorse truck or family SUV. This module is a direct replacement for a wide range of part numbers, including 15943678, 25835966, 15926094, and 22860591, making it a versatile fix for many 2007-2013 GM vehicles.
Installation & Post-Install Notes
Installation is straightforward. The BCM is typically located under the driver’s side dashboard, near the steering column. Simply disconnect the battery, remove the old module, plug in the new one, and reconnect the battery. In most cases, you’re done. However, if your airbag light was on due to the old BCM, you may need a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the new module with the airbag system. There is no core charge, so you can keep your old part without any hassle.
Frequently Asked Questions
What does a Body Control Module do on a GMC Sierra?
The BCM acts as the central computer for your truck’s body electronics. It controls non-engine related functions like your lights, power windows and locks, security system, wipers, and the HVAC climate control system.
Is this BCM difficult to install?
No, installation is typically very simple and takes less than 15 minutes. It involves unplugging the old module from under the dashboard and plugging the new one in. No special tools are required for the physical replacement.
Will I need to take my truck to the dealership after installing this?
No. This BCM comes pre-programmed to your vehicle’s VIN. This means it’s ready for immediate installation without requiring any additional, expensive programming from a dealership.
My airbag light is on after installation. Is the part defective?
No, this is a known security procedure with GM vehicles. If the airbag light is on, it means the new BCM needs to be electronically ‘introduced’ to the airbag system. This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ function, which syncs the modules and turns off the light.
How do I know if this part number will fit my vehicle?
This module replaces many part numbers, including 15943678 and 25844480. The best way to ensure compatibility is to check the part number on your original module or use the fitment guide on our website. You can also contact us with your VIN for guaranteed fitment.
What happens if I don’t replace a failing BCM?
Ignoring a failing BCM can lead to worsening electrical problems, potential security system issues that could leave you stranded, and even safety concerns if exterior lights or wipers fail unexpectedly.