Restore Full Electrical Function to Your GM Truck or SUV
Are you dealing with frustrating and unpredictable electrical issues in your 2007-2011 Chevrolet Avalanche 1500? Problems like flickering lights, unresponsive power windows, a malfunctioning security system, or a dead HVAC blower are common signs of a failing Body Control Module (BCM). The BCM acts as the central nervous system for your vehicle’s body electronics, and when it fails, it can cause a cascade of confusing symptoms. This genuine quality GM Body Control Module, part number 25844480, is the definitive solution to restore your truck’s functionality and reliability.
From the Diagnostic Bay
We recently had a 2009 GMC Sierra (which shares the same platform as the Avalanche) in the shop with a persistent battery drain that had the owner stumped. He had already replaced the battery and alternator, but the truck would be dead every morning. After diagnosing the network, we discovered the original BCM was not entering its ‘sleep mode,’ keeping multiple circuits active and draining the battery overnight. Installing this VIN-programmed BCM resolved the parasitic draw immediately, saving the customer from needlessly replacing more parts. Often, the root of complex electrical gremlins is a faulty central module.
Is Your Truck Showing These Symptoms?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, a faulty module is the likely culprit:
- ✔ Power windows, door locks, or interior/exterior lights acting erratically or not working at all.
- ✔ HVAC system failures, such as the blower motor not turning on or climate controls being unresponsive.
- ✔ An active airbag warning light, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Security system malfunctions, causing no-start conditions or random alarm activation.
- ✔ Unexplained battery drain, stalling, misfires, or strange grounding issues that are hard to trace.
- ✔ A variety of communication-related DTCs stored in the vehicle’s memory.
The Plug-and-Play Solution for Your Avalanche 1500 Body Control Module
Forget expensive dealership visits and complex programming procedures. We simplify the repair process by pre-programming this module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that it integrates seamlessly with your truck’s existing systems right out of the box. Loaded with the latest GM software updates, it’s designed for a straightforward, plug-and-play installation. This not only restores original functionality but also ensures optimal performance and communication between all related electronic components.
Installation and Post-Install Procedures
Physically installing the BCM is simple. It’s typically located under the driver’s side dashboard, near the steering column, and can be swapped out in minutes. However, depending on your vehicle’s specific state, some post-installation steps may be necessary:
- Airbag System Sync: If the airbag warning light is illuminated after installation (often with code B1001), a ‘Setup SDM Primary Key in BCM’ procedure must be performed. This requires a professional-grade scan tool and syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor recalibration to ensure proper brake light operation and traction control functionality.
This module is a direct replacement for a wide range of part numbers, including 25823559, 25835966, 15943678, 20939137, 22860591, and more, ensuring broad compatibility across many GM trucks and SUVs from this era.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we flash the module with your truck’s specific VIN and the latest GM software before shipping. This makes the unit plug-and-play, as it’s already configured to communicate with your vehicle’s other electronic systems without needing a trip to the dealer.
Is this part difficult to install myself?
The physical installation is very easy, usually taking less than 15 minutes with basic tools. However, be aware that post-install procedures like the airbag system sync may require a bi-directional scan tool that most DIY mechanics do not own.
Do I need to send my old BCM back?
No. There is no core charge for this part. You can keep your old module, saving you the time and hassle of a return shipment.
Will this BCM fix my airbag light?
If the airbag light is caused by a communication error with a faulty BCM (like DTC B1001), this part will fix the root cause. However, you will still need to perform the ‘Setup SDM Primary Key in BCM’ procedure with a proper scan tool to turn the light off.
What if I still have issues after installation?
After confirming any necessary post-install procedures have been completed, double-check all vehicle grounds and connectors. Poor grounds are a very common issue on these trucks and can mimic the symptoms of a faulty module.