Tired of Unpredictable Electronics in Your Chevy Avalanche?
If you’re dealing with a frustrating mix of electrical problems in your 2007-2011 Chevrolet Avalanche—like the air conditioning suddenly quitting, power windows refusing to budge, or a persistent airbag light—the Body Control Module (BCM) is the most likely culprit. As the central nervous system for your truck’s comfort and convenience features, a failing BCM can cause chaos. This OEM-quality replacement, part number 25790508, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a hassle-free, plug-and-play repair.
Forget about expensive dealership visits and programming fees. We handle the complex part for you. Simply provide your VIN at checkout, and we’ll flash the module with the latest GM software updates. This ensures all the electronic components it manages—from your door locks and wipers to the security system—communicate flawlessly, just like they did from the factory.
A Technician’s Notebook: The Grounding Gremlin
I once had a 2009 Sierra in the shop with a classic case of BCM failure symptoms: intermittent radio, flickering dash lights, and a security light that wouldn’t turn off. The owner had already replaced the battery and checked the fuses. Before swapping the BCM, I did my due diligence and checked the main BCM ground point located on the driver-side A-pillar. Sure enough, it was corroded. After cleaning the contact point, half the issues vanished, but the security light remained. A new, programmed BCM fixed the final problem. Moral of the story: Always check your grounds during a BCM replacement. It can save you from a world of diagnostic headaches and prevent damage to the new module.
Is Your Avalanche Showing These Electrical Faults?
- ✔ The HVAC blower motor works intermittently or not at all.
- ✔ An airbag warning light is illuminated, often with DTC B1001 (Setup SDM Primary Key in BCM).
- ✔ Power windows, door locks, or interior/exterior lights operate erratically or have failed completely.
- ✔ The anti-theft or security system malfunctions, sometimes preventing the truck from starting.
- ✔ You’re experiencing seemingly unrelated issues like stalling, misfires, or strange instrument cluster behavior.
- ✔ Your scanner is pulling various U-codes or B-codes related to body systems.
Your 5-Minute Path to a Fully Functional Truck
Installation is a straightforward job for any DIYer and can be completed in minutes with basic tools. The BCM is located under the driver’s side dashboard, near the steering column.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the BCM: Find the module under the driver’s side dash. It will have several large electrical connectors plugged into it.
- Swap the Module: Carefully unplug the connectors from the old BCM. They have release tabs that need to be pressed. Unbolt or unclip the old module and install the new one in its place.
- Reconnect and Test: Securely plug all connectors into your new BCM. Reconnect the battery terminal and start the vehicle. Test all functions like windows, locks, lights, and HVAC.
- Post-Install Checks: In some cases, an airbag light may persist. This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ function. Similarly, a ‘Brake Pedal Position Relearn’ might be needed. These are simple procedures for any competent shop if required.
Verified Fitment for Your GM Truck or SUV
This BCM is a direct replacement for part number 25790508 and other interchangeable numbers on a wide range of GM vehicles. While this page focuses on the 2007-2011 Avalanche BCM, it also fits many other models. Please verify your part number or consult our full fitment list, which includes:
- Chevrolet Avalanche, Silverado, Suburban, Tahoe (2007-2013)
- GMC Sierra, Yukon, Yukon XL (2007-2013)
- Cadillac Escalade, ESV, EXT (2007-2013)
Frequently Asked Questions
What does a Body Control Module do on my Avalanche?
The BCM acts as the main computer for your truck’s body electronics. It controls non-engine related functions like power windows, door locks, interior lights, the security system, wipers, and the HVAC system.
Why is VIN programming so important?
VIN programming loads your truck’s specific software and configurations onto the BCM. This ensures it works seamlessly with the other modules and options in your vehicle right out of the box, eliminating the need for a costly trip to the dealership for programming.
Is this difficult to install myself?
Not at all. For most DIYers with basic tools, this is a very simple, 5-10 minute job. The module is easily accessible under the driver’s side dashboard.
What if my airbag light is still on after installation?
This is a common security handshake procedure. If the airbag light stays on (often with code B1001), the BCM and the Sensing and Diagnostic Module (SDM) need to be synced. This is done with a bi-directional scan tool using the ‘Setup SDM Primary Key in BCM’ function.
Do I need to return my old BCM?
No. There is no core charge for this part. You can keep your old module without any extra fees or hassle.