Tired of Chasing Electrical Gremlins in Your Truck?
If your 2007-2011 Chevrolet Avalanche 1500 is acting possessed—with flickering lights, a dead A/C blower, or power locks with a mind of their own—you’ve likely met the culprit: a failing Body Control Module (BCM). This component is the central nervous system for your truck’s body electronics, and when it fails, it can cause a cascade of frustrating and difficult-to-diagnose issues. This OEM-quality replacement BCM, part number 15940214, is the definitive solution. It arrives expertly programmed to your vehicle’s specific VIN, making the repair straightforward and eliminating the need for a costly trip to the dealership. Restore full, reliable functionality to your truck’s essential systems and get back on the road with confidence.
A Technician’s Notebook: The Avalanche with a Ghost
A customer brought in his ’09 Avalanche, completely fed up. The radio would randomly shut off, the driver’s side power window wouldn’t work, and the airbag light was on. He’d already replaced the window switch and checked fuses. After hooking up my scanner, I saw a handful of communication codes and the infamous BCM code B1001. In my shop, I’ve seen this exact pattern dozens of times. A failing BCM can’t properly communicate with other modules, leading to these bizarre, scattered symptoms. We installed a VIN-programmed BCM, performed the quick SDM key sync, and all the problems vanished instantly. It’s a classic case where one part solves five different headaches.
Common Signs of a Failing BCM
A faulty Body Control Module can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your 2007-2011 Avalanche 1500 BCM needs replacement:
- ✔ Intermittent or non-functional HVAC controls, especially the blower motor.
- ✔ Power windows, door locks, or interior/exterior lights behaving erratically or not working at all.
- ✔ The security system light is flashing, and the vehicle may stall or fail to start.
- ✔ An active airbag warning light on the dash, often with a stored Diagnostic Trouble Code (DTC) like B1001.
- ✔ Unexplained battery drain or issues with electrical grounding.
- ✔ Multiple communication-related DTCs stored in the system.
Your Straightforward Installation Guide
Replacing the BCM is a job most DIYers can handle in under 15 minutes right in their own driveway. It’s located under the driver’s side dashboard, near the steering column.
- Step 1: Safety First. Always disconnect the negative terminal from your vehicle’s battery before working on any electrical components.
- Step 2: Locate the BCM. It’s a black plastic box with several large electrical connectors, typically mounted to a bracket under the dash.
- Step 3: Disconnect and Remove. Carefully unplug all the wiring harnesses. They have locking tabs that need to be depressed. Once unplugged, unbolt or unclip the old module and remove it.
- Step 4: Install the New Module. Mount your new, pre-programmed BCM in the same location and securely reconnect all the wiring harnesses.
- Step 5: Reconnect and Test. Reconnect the negative battery terminal. Start the vehicle and test all functions: lights, locks, windows, wipers, and HVAC to confirm the repair.
Post-Installation Note: In some cases, the airbag light may remain on. This requires a ‘Setup SDM Primary Key in BCM’ procedure using a compatible high-level scan tool. A Brake Pedal Position Relearn may also be necessary for certain models.
Will This Fit My Truck?
This Body Control Module is a direct-fit replacement 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 and part numbers:
Interchangeable Part Numbers: 15940214, 25835966, 15263363, 15263497, 15878753, 15284816, 15943678, 15926094, 25790508, 25790509, 25823558, 25823559, 25835965, 25844479, 25971916, 25971917, 15901388, 20939137, 20939138, 22860591.
Compatible Models Include: Chevrolet Avalanche 1500, Silverado 1500/2500/3500, Suburban 1500/2500, Tahoe; GMC Sierra 1500/2500/3500, Sierra Denali, Yukon, Yukon XL; Cadillac Escalade, Escalade ESV, Escalade EXT. Please verify your part number before ordering to ensure correct fitment.
Frequently Asked Questions
Frequently Asked Questions
Do I need to have this BCM programmed by the dealer?
No. We program the module to your vehicle’s VIN before shipping. It arrives ready for installation, with no additional programming required, saving you time and money.
What happens if my airbag light is still on after installation?
This is a known possibility. It means the new BCM needs to be synced with the airbag system’s SDM. This requires a ‘Setup SDM Primary Key’ procedure, which can be done with a professional-grade diagnostic tool. Most local repair shops can perform this service if needed.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old module without any hassle or need to return it.
Will this fix my truck’s no-start issue?
If the no-start is caused by the BCM failing to recognize the key or communicate with the engine computer (a common failure), then yes, this part is very likely to resolve the problem.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure perfect programming.