Are you battling frustrating electrical gremlins in your GM vehicle? Issues like erratic power windows, malfunctioning door locks, flickering interior lights, or a security system that acts up on its own are often traced back to a single component: a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it starts to fail, it can cause a wide range of confusing and intermittent problems. This replacement BCM, part number 25910474, is the definitive solution to restore full functionality and reliability to your vehicle.
We take the guesswork and high cost out of the repair process. Unlike a standard replacement that requires a trip to the dealership for expensive programming, this module arrives at your door pre-programmed with the latest GM software updates, specifically matched to your vehicle’s VIN. This plug-and-play approach saves you time and money, getting your truck or van back to work faster. Simply provide us with your VIN after purchase, and our experts will handle the programming before it ships. This ensures seamless integration with your vehicle’s existing systems.
From the Diagnostic Bay
We had a 2011 Express work van come in that was a complete mystery to the owner. The battery would be dead every other morning, the radio would sometimes stay on after the key was removed, and the power locks worked intermittently. We checked for battery drains and shorts but found nothing obvious. After connecting our diagnostic tool, we saw multiple communication errors pointing to the BCM. Instead of a complex wiring issue, the fix was a new Express 3500 Body Control Module. Once we installed the VIN-programmed unit, all the phantom electrical issues vanished instantly. It’s a perfect example of how one faulty module can mimic a dozen different problems.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-working power windows, door locks, and mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or don’t turn on at all.
- ✔ A security system that engages randomly or prevents the vehicle from starting.
- ✔ Unexplained battery drain that leaves you with a dead battery.
- ✔ Warning lights on the dashboard, such as the airbag or security light.
- ✔ Wipers or radio behaving erratically.
- ✔ Inaccurate gauge readings on the instrument cluster.
Installation and Post-Install Notes
Replacing your Express 3500 Body Control Module is straightforward. The module is typically located under the dash on the driver’s side or in the center dash area. After disconnecting the battery, simply unplug the wiring harnesses from the old BCM, remove it, and install the new one in its place. While our VIN programming handles the majority of the setup, some vehicles may require a simple relearn procedure after installation.
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is needed. This syncs the new BCM with the airbag system and can be performed with a professional-grade scan tool.
- Brake Pedal Position Relearn: On certain models, a brake pedal position sensor recalibration might be necessary to ensure correct brake light operation and traction control function.
This BCM is a direct replacement for a wide range of GM vehicles and part numbers. Please verify your original part number and check the fitment list below to ensure compatibility with your specific make, model, and year.
Frequently Asked Questions
What is a BCM and what does it do?
The Body Control Module (BCM) is a computer in your vehicle that controls and monitors a wide variety of electronic accessories not related to the engine, such as power windows, locks, lights, wipers, and the security system.
Is this BCM ready to install out of the box?
Yes! This BCM is programmed to your vehicle’s specific VIN before we ship it. This means it’s ready for installation without needing a trip to the dealer for programming, though some minor post-installation relearn procedures may be required depending on your vehicle.
How do I provide my vehicle’s VIN?
After you complete your purchase, you can send us a message with your 17-digit VIN. We cannot program and ship the module without it, so please provide it promptly to avoid delays.
What if my airbag light comes on after installation?
This is a common security measure. The new BCM needs to be synced with the airbag’s Sensing and Diagnostic Module (SDM). A ‘Setup SDM Primary Key in BCM’ procedure must be performed with a compatible high-end scan tool to resolve this.
Do I need to send my old BCM back?
No. There is no core charge for this part. You can keep your original module.
Will this fix my specific electrical problem?
This part is designed to fix problems directly caused by a faulty BCM. If your vehicle is experiencing issues like erratic lights, non-functional power accessories, or phantom battery drain, a failing BCM is the most likely cause.