Restore Full Electrical Function to Your Truck
Are you battling frustrating electrical gremlins in your Chevrolet or GMC truck? Flickering lights, a dead HVAC system, or power windows with a mind of their own are classic signs of a failing Body Control Module (BCM). As the central command for your vehicle’s body electronics, a faulty BCM can cause a cascade of confusing issues. This OEM-quality replacement BCM, pre-programmed to your vehicle’s specific VIN, is the definitive solution to restore order and reliability. It’s designed to be a direct-fit replacement, eliminating the need for expensive dealership programming and getting you back on the road with confidence.
Case Study: The “Haunted” Silverado
I once had a 2009 Silverado 1500 in my bay that the owner swore was possessed. The radio would change stations, the dome light would stay on, the driver’s window wouldn’t roll down, and he was getting a random airbag light. He’d already replaced the battery and checked fuses. After hooking up my scanner, I saw a dozen communication codes pointing in different directions. This is a tell-tale sign. Instead of chasing each problem individually, we went straight for the central hub: the BCM. A quick check of the ground wire near the module (a common failure point) showed it was secure. We swapped in a VIN-programmed BCM, and like magic, every single issue disappeared. It’s a powerful reminder that when multiple, unrelated electronics fail at once, the BCM should be your first suspect.
Is Your Truck Showing These Symptoms?
- ✔ Unresponsive or erratic HVAC controls, including a blower motor that won’t turn on or off.
- ✔ An active airbag warning light, often accompanied by diagnostic trouble code (DTC) B1001.
- ✔ Widespread electrical failures: power locks, windows, or interior/exterior lights not working correctly.
- ✔ Security system faults, such as the engine stalling immediately after starting or random alarm activation.
- ✔ A cluster of seemingly unrelated communication or body-related DTCs stored in the system.
Your 5-Minute Installation Guide
Replacing the 2007-2011 Avalanche 1500 BCM is a job most DIYers can handle in minutes. The module is typically located under the driver’s side dashboard, near the steering column.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on electrical components.
- Locate the BCM: On most models, you’ll find it attached to a bracket under the dash. You may need to remove a plastic trim panel for access.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs, so be sure to depress them fully before pulling. Once disconnected, unclip or unbolt the old module from its mounting location.
- Install the New Module: Seat the new, VIN-programmed BCM into the bracket and securely plug in all the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect and Test: Reconnect the negative battery terminal. Start the vehicle and test all functions—lights, wipers, windows, door locks, and HVAC—to confirm the repair was successful.
Post-Installation Note: In some cases, particularly if you had an airbag light, the system may need to be synchronized. This requires a professional scan tool to perform the “Setup SDM Primary Key in BCM” procedure. A brake pedal position relearn might also be necessary for certain models.
Verified Fitment for Your GM Truck or SUV
This module is a direct replacement for a wide range of General Motors vehicles and is interchangeable with numerous part numbers, including 25844480, 25835966, 15943678, 20939137, and 22860591. It is guaranteed to fit the following models:
Note: For 2007 models, this fits the ‘new style’ with a smooth door skin. Please verify your part number or contact us with your VIN to ensure perfect compatibility.
Frequently Asked Questions
Does this BCM really not require a trip to the dealership?
That’s correct. We pre-program the module to your vehicle’s VIN before shipping. This ensures it communicates perfectly with your truck’s other systems right out of the box, saving you hundreds in dealership programming fees.
What if my airbag light is still on after installation?
If the airbag light persists, it simply means the new BCM needs to be electronically ‘introduced’ to the airbag system (SDM). This is done with a pro-level scan tool using the ‘Setup SDM Primary Key’ function and is a quick procedure for any qualified mechanic.
Is the installation difficult for a DIYer?
Not at all. The physical swap takes less than 5 minutes with basic hand tools. It’s located under the driver’s side dash and involves unplugging the old module and plugging in the new one.
Do I need to send my old part back?
No. There is no core charge for this part. You can keep or dispose of your old module without any hassle.
What part numbers does this module replace?
This part is a direct replacement for many common BCM part numbers, including 25823558, 25844480, 25835966, 15263363, 15878753, 15943678, 20939137, and 22860591, among others.