If you’re dealing with baffling electrical gremlins in your 2007-2011 GMC Sierra 3500, you’re not alone. Over my 20 years in the shop, I’ve seen countless GMT900-platform trucks come in with flickering lights, a dead instrument cluster, or power accessories that have a mind of their own. More often than not, the culprit is a failing Body Control Module (BCM). This isn’t just an annoyance; it’s the central command for your truck’s comfort and safety features. This OEM-quality Body Control Module, part number 15284816, is the definitive solution to get your workhorse back in reliable condition.
We take the guesswork and dealership hassle out of the equation. Each module is expertly programmed to your truck’s specific Vehicle Identification Number (VIN) before it ships. This ensures it communicates flawlessly with your Powertrain Control Module (PCM), anti-lock brake system, and airbag module right out of the box. You get a true plug-and-play part that restores full functionality without needing an expensive trip to the dealer for programming.
From the Diagnostic Bay
A contractor brought his ’09 Sierra 3500 dually into my bay last month with a list of bizarre symptoms. The radio would cut out, the driver’s side power window wouldn’t work, and the airbag light was on. He was worried it was a major wiring harness issue. After hooking up my scanner, I pulled a DTC B1001 (Option Configuration Error) and a few U-codes indicating a loss of communication. Before tearing into the dash, I checked the BCM ground—a common failure point. It was solid. That pointed directly to an internal BCM failure. We swapped in one of these VIN-programmed modules, performed the quick SDM key relearn, and every single issue was resolved in under 15 minutes. He was back on the road to his next job site, problem solved.
Is Your Sierra 3500 Showing These Symptoms?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, this module is your likely solution:
- ✔ An active airbag warning light, often with DTC B1001 stored in the system.
- ✔ Intermittent or non-functional power windows, door locks, or interior lights.
- ✔ HVAC controls that don’t respond or a blower motor that works sporadically.
- ✔ Erratic behavior from the security system, including no-start or stalling conditions.
- ✔ Communication error codes (U-codes) when scanning other modules.
- ✔ Headlights, taillights, or turn signals not working correctly.
A Straightforward Guide to BCM Installation
For the confident DIYer or professional technician, replacing the 2007-2011 Sierra 3500 BCM is a quick job. It’s typically located under the driver’s side dashboard, near the steering column.
- Safety First: Always disconnect the negative terminal from your truck’s battery before working on any electronic components.
- Locate the Module: Find the BCM under the dash. It’s a black plastic box with several large multi-pin connectors.
- Disconnect and Remove: Carefully unplug all electrical connectors. They have locking tabs, so be gentle. Once unplugged, unclip or unbolt the old module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed module in place and securely reconnect all the electrical harnesses. Double-check that every plug is fully seated.
- Reconnect Power: Reattach the negative battery terminal.
- Critical Final Steps: After installation, you must perform the ‘Setup SDM Primary Key in BCM’ procedure with a bi-directional scan tool to clear the airbag light. Some vehicles may also require a brake pedal position sensor recalibration.
Verified Fitment for Your GM Truck
While this is a direct-fit solution for the 2007-2011 GMC Sierra 3500, this module is also compatible with a wide range of other GM trucks and SUVs, ensuring broad applicability. It is a direct replacement for part numbers 15284816, 25835966, 15943678, 20939137, and others listed in our cross-reference. Please verify your part number or use our vehicle selector to guarantee fitment.
- GMC Sierra 1500/2500/3500 & Denali
- Chevrolet Silverado 1500/2500/3500
- Chevrolet Avalanche & Suburban
- GMC Yukon & Yukon XL
- Cadillac Escalade, ESV, & EXT
Frequently Asked Questions
Do I need to program this 2007-2011 Sierra 3500 BCM?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you a trip to the dealership.
Where is the BCM located on my Sierra 3500?
The Body Control Module is located under the driver’s side of the dashboard, typically to the left of the steering column.
Will this fix my airbag light and DTC B1001?
Yes, a faulty BCM is a primary cause of the B1001 code. Replacing it and performing the ‘Setup SDM Primary Key’ procedure with a proper scan tool will resolve the issue and turn off the airbag light.
What tools are required for installation?
Basic hand tools like a socket set or nut driver are usually all that’s needed to remove the old module. A bi-directional scan tool is required for the post-installation airbag system relearn procedure.
Is there a core charge for my old part?
No, there is no core charge. You can keep or dispose of your old module without the hassle of returning it.
What if my electrical problems continue after replacement?
In my experience, if issues persist, it’s critical to check for poor ground connections (especially the main BCM ground) or potential wiring issues, as these can mimic the symptoms of a failed module.