Fix Your Truck’s Electrical Gremlins for Good
If you’re dealing with flickering lights, a dead HVAC system, or random warning messages on your 2007-2011 Chevrolet Avalanche 1500, you’ve likely met the frustrating reality of a failing Body Control Module (BCM). As the electronic nerve center for your truck’s comfort and security features, a faulty BCM can cause a cascade of problems that are often misdiagnosed. This VIN-programmed BCM, a direct replacement for part number 20939137, is the reliable, straightforward solution to restore full functionality and peace of mind without a costly trip to the dealership.
Case Study: The Phantom Battery Drain
A customer brought in his ’09 Silverado with a classic complaint: a dead battery every morning. He’d already replaced the battery and alternator, but the problem persisted. After a quick diagnostic scan, I saw no parasitic draw from the usual suspects. However, I noticed the interior lights would flicker faintly long after the doors were shut. This pointed me straight to the BCM. A failing module wasn’t letting the truck’s systems fully go to sleep. We swapped in a VIN-programmed BCM, and the problem was solved instantly. It’s a perfect example of how a 2007-2011 Avalanche 1500 BCM failure can mimic other, more expensive problems.
Is Your Avalanche Showing These Symptoms?
- ✔ The air conditioning or heater blower only works intermittently or not at all.
- ✔ Your power windows, door locks, or windshield wipers have a mind of their own.
- ✔ The security system acts up, preventing the truck from starting or causing stalling.
- ✔ An airbag warning light is illuminated on the dash, often with a DTC B1001 code stored.
- ✔ You’re experiencing strange electrical issues, like lights staying on or the radio not turning off.
- ✔ Diagnostic scans reveal multiple communication or body-related trouble codes.
Your 5-Minute Installation Guide
Getting your truck back to normal is easier than you think. This module is designed for a simple, direct-fit replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On your Avalanche, the BCM is located under the driver’s side dashboard, just below the steering column. It’s a black box with several large connectors.
- Swap the Module: Carefully unplug the electrical connectors from the old BCM. Release the mounting tabs and remove the old unit. Snap the new module into place and securely re-attach all connectors.
- Reconnect and Test: Reconnect the negative battery terminal. Start your vehicle and test all functions—lights, locks, windows, HVAC, and wipers—to confirm the repair.
- 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. Additionally, a Brake Pedal Position Relearn might be needed for certain models.
Why Choose Our Pre-Programmed BCM?
This isn’t just a replacement part; it’s a complete solution. We program the module to your truck’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures that the BCM communicates flawlessly with your vehicle’s other electronic systems, like the Engine Control Module (ECM) and Transmission Control Module (TCM), right out of the box. You get optimal performance with the latest GM software updates, all while avoiding the high costs and scheduling hassles of dealership programming.
Verified Vehicle Compatibility
This Body Control Module is a guaranteed fit for a wide range of General Motors trucks and SUVs. While this page focuses on the 2007-2011 Avalanche 1500 BCM, it is also compatible with the following vehicles:
- Chevrolet: Avalanche 1500 (2007-11), Silverado 1500/2500/3500 (2007-13), Suburban 1500/2500 (2007-11), Tahoe (2007-11)
- GMC: Sierra 1500/2500/3500 (2007-13), Sierra Denali (2007-13), Yukon & Yukon XL (2007-11)
- Cadillac: Escalade, Escalade ESV & EXT (2007-11)
This module is interchangeable with part numbers: 25835966, 15263363, 15263497, 15878753, 15284816, 15943678, 15926094, 15940214, 25790508, 25790509, 25823558, 25823559, 25835965, 25844479, 25971916, 25971917, 15901388, 20939138, and 22860591.
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM is a computer that manages your vehicle’s non-engine related electronics. This includes power windows, door locks, interior and exterior lighting, the security system, HVAC controls, and wipers.
What does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s specific VIN into the module before shipping. This makes installation a simple plug-and-play process, saving you from needing expensive programming services at a dealership.
Do I need to return my old BCM?
No. There is no core charge for this part. You can keep or dispose of your old module without any hassle.
My airbag light came on after I installed the new BCM. What do I do?
This is a normal security measure in GM vehicles. The new BCM needs to be synced with the airbag’s Sensing and Diagnostic Module (SDM). This requires a professional-grade scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure to clear the light.
Is this a difficult part to replace myself?
For most DIYers, this is a very straightforward job. It typically requires only basic hand tools to access the module under the dashboard and takes less than 15 minutes to swap out.