Solve Your Truck’s Electrical Gremlins for Good
If you’re dealing with a 2007-2011 GMC Sierra 3500 that seems to have a mind of its own—with flickering lights, a dead HVAC system, or random warning messages—you’re likely facing a failing Body Control Module (BCM). As the central command center for your truck’s body electronics, a faulty BCM can cause a cascade of frustrating and unpredictable problems. This VIN-programmed replacement BCM, equivalent to part number 15943678, is the direct-fit, reliable solution to restore full functionality and peace of mind to your heavy-duty truck.
Forget about expensive dealership visits and programming fees. We handle the complex part for you. By programming this module to your truck’s specific VIN before shipping, we ensure it communicates flawlessly with your vehicle’s other systems right out of the box. It’s a true plug-and-play fix that gets you back on the road, and back to work, without the hassle.
From the Diagnostic Bay: The Case of the Haunted Sierra
I remember a 2009 Sierra 3500 that came into my shop with a laundry list of bizarre issues. The radio would cut out, the power locks would cycle randomly, and the A/C blower was completely dead. The customer had already replaced the battery and checked fuses, but the problems persisted. After hooking up my scanner, I saw a dozen communication codes pointing to the BCM. A quick inspection under the dash revealed the culprit: a poor ground connection near the BCM had caused voltage spikes, slowly cooking the original module. Installing a pre-programmed Sierra 3500 Body Control Module and securing the ground fixed every single issue. It’s a perfect example of why this component is so critical to your truck’s operation.
Is Your Sierra 3500 Showing These Electrical Faults?
A failing BCM doesn’t always trigger a check engine light. Instead, it manifests as a variety of electrical malfunctions. Here are the most common signs I’ve seen in my 20+ years of experience:
- ✔ Your power windows, door locks, or mirrors work intermittently or not at all.
- ✔ The interior dome lights or exterior lamps stay on or won’t turn on.
- ✔ The HVAC climate controls or blower motor have stopped responding.
- ✔ An airbag warning light is illuminated, often with a DTC like B1001 (SDM Mismatch).
- ✔ The security system acts up, preventing the truck from starting or causing it to stall.
- ✔ You’re experiencing strange instrument cluster behavior or false warnings.
Your 15-Minute BCM Swap Guide
Installing your new Sierra 3500 Body Control Module is a straightforward job that most DIYers can complete with basic hand tools. The module is located under the driver’s side dashboard, near the steering column.
- Safety First: Always disconnect the negative terminal from your truck’s battery to prevent electrical shorts.
- Locate the BCM: Remove the lower dash panel beneath the steering wheel to access the module. It’s a black box with several large multi-pin connectors.
- Swap the Module: Carefully release the locking tabs on each electrical connector and unplug them. Remove the mounting screws or clips holding the old BCM in place, and then install the new module.
- Reconnect Everything: Plug all electrical connectors firmly into the new BCM until they click. Reinstall the dash panel.
- Power Up: Reconnect the negative battery terminal. Start your vehicle and test all functions like lights, locks, and windows to confirm the repair.
Important Note: In some cases, particularly if your airbag light was on, a post-installation procedure may be needed. See our FAQ section for more details on the “SDM Primary Key Setup.”
Verified Fitment for Your GM Truck or SUV
This module is a direct replacement for part number 15943678 and other interchangeable numbers. It is guaranteed to fit the following vehicles. Please verify your model and year to ensure compatibility.
AVALANCHE 1500 08-09 Body Control (BCM); (under steering column)
AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 25835966
AVALANCHE 1500 11 Body Control (BCM)
ESCALADE 07-09 Body Control (BCM); (under steering column)
ESCALADE 10 Body Control (BCM); (under steering column), ID 25835966
ESCALADE 11 Body Control (BCM); (under steering column)
ESCALADE ESV 07-09 Body Control (BCM); (under steering column)
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 25835966
ESCALADE ESV 11 Body Control (BCM); (under steering column)
ESCALADE EXT 07-09 Body Control (BCM); (under steering column)
ESCALADE EXT 10 Body Control (BCM); (under steering column), ID 25835966
ESCALADE EXT 11 Body Control (BCM); (under steering column)
SIERRA 1500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 1500 PICKUP 08 Body Control (BCM); (under steering column)
SIERRA 1500 PICKUP 09 Body Control (BCM), (under steering column)
SIERRA 1500 PICKUP 10-11 Body Control (BCM); (under steering column)
SIERRA 2500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 2500 PICKUP 08-11 Body Control (BCM); (under steering column)
SIERRA 2500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SIERRA 3500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 3500 PICKUP 08-11 Body Control (BCM); (under steering column)
SIERRA 3500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SILVERADO 1500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SILVERADO 1500 PICKUP 08-11 Body Control (BCM); (under steering column)
SILVERADO 2500 PICKUP 07 Body Control (BCM); new style (smooth door skin), under steering column)
SILVERADO 2500 PICKUP 08 Body Control (BCM), (under steering column)
SILVERADO 2500 PICKUP 09-11 Body Control (BCM); (under steering column)
SILVERADO 2500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SILVERADO 3500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SILVERADO 3500 PICKUP 08 Body Control (BCM), (under steering column)
SILVERADO 3500 PICKUP 09-11 Body Control (BCM); (under steering column)
SILVERADO 3500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SUBURBAN 1500 07-09 Body Control (BCM); (under steering column)
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 25835966
SUBURBAN 1500 11 Body Control (BCM); (under steering column)
SUBURBAN 2500 07-09 Body Control (BCM); (under steering column)
SUBURBAN 2500 10 Body Control (BCM), (under steering column)
SUBURBAN 2500 11 Body Control (BCM); (under steering column)
TAHOE 07 Body Control (BCM); (under steering column)
TAHOE 08 Body Control (BCM)
TAHOE 09 Body Control (BCM); (under steering column)
TAHOE 10 Body Control (BCM); (under steering column), ID 25835966
TAHOE 11 Body Control (BCM); (under steering column)
YUKON 07 Body Control (BCM); (under steering column)
YUKON 08 Body Control (BCM), (under steering column)
YUKON 09 Body Control (BCM); (under steering column)
YUKON 10 Body Control (BCM); (under steering column), ID 25835966
YUKON 11 Body Control (BCM), (under steering column)
YUKON XL 1500 07-09 Body Control (BCM), (under steering column)
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 25835966
YUKON XL 1500 11 Body Control (BCM); (under steering column)
YUKON XL 2500 07-08 Body Control (BCM), (under steering column)
YUKON XL 2500 09-11 Body Control (BCM); (under steering column)
Frequently Asked Questions
Why does this BCM need my VIN?
Your truck’s VIN is essential because it allows us to program the module with the exact software and settings for your specific options (like power seats, climate control type, etc.). This ensures all features work correctly without any additional programming.
Is this a difficult part to replace myself?
Not at all. For most people with basic tools, this is a 15-30 minute job. It’s located under the dashboard and involves unplugging the old module and plugging in the new one. No complex wiring is required.
What if the airbag light is on after I install it?
This can happen. It means the new BCM needs to be electronically introduced to the airbag system’s Sensing and Diagnostic Module (SDM). A mechanic with a bi-directional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to clear the light.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module without any hassle or extra fees.
Will this fix my check engine light?
A BCM typically controls body functions, not engine performance. If your check engine light is on, the problem is likely with a different component, such as the Engine Control Module (ECM). However, BCM issues can sometimes cause communication-related engine problems like stalling.