Are you chasing electrical gremlins in your GMC Sierra? One day the power windows work, the next they don’t. Maybe your A/C is stuck on full blast or won’t turn on at all. These aren’t just annoyances; they’re classic signs of a failing Body Control Module (BCM). As the central command for your truck’s body electronics, a faulty BCM can wreak havoc. This replacement BCM, interchangeable with part number 15878753, is the reliable, straightforward solution to restore full functionality to your vehicle.
We take the guesswork and dealership hassle out of the equation. Each module is expertly programmed to your truck’s specific VIN before it ships. This means no expensive trips to the dealer for programming—it’s ready for installation right out of the box. This is the definitive fix for the persistent, frustrating electrical issues that plague so many GM trucks and SUVs of this era.
Is Your Sierra Showing These Symptoms?
- ✔️ Power windows, door locks, or mirrors operating intermittently or not at all.
- ✔️ HVAC system behaving erratically (blower motor issues, incorrect temperatures).
- ✔️ The security light is on, and you’re experiencing no-start or stalling conditions.
- ✔️ An airbag warning light is illuminated, often with a diagnostic trouble code like B1001.
- ✔️ Headlights, taillights, or interior lights flickering, staying on, or not working.
- ✔️ The instrument cluster displaying false warnings or acting erratically.
A Technician’s Notebook: The Grounding Gremlin
I had a 2009 Silverado in the bay last month with a textbook case of BCM failure—the radio would cut out, the driver’s window was dead, and the security light would flash randomly. The owner had already replaced the BCM once himself, but the problems returned within a week. Before condemning the new part, I checked the main BCM ground point located on the driver-side A-pillar behind the kick panel. Sure enough, it was corroded. After cleaning the contact point to bare metal, both the old and new BCMs worked perfectly. Always check your grounds during a BCM replacement; a poor ground can mimic BCM failure and damage a new module.
A Straightforward Guide to Installation
Replacing the 2007-2011 Sierra 1500 BCM is a job most DIYers can handle in their driveway in under 10 minutes. It’s located in a junction block under the driver’s side of the 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 or knee bolster (usually held by a few clips or screws) to access the junction block.
- Disconnect and Remove: The BCM is a module plugged into the junction block with several large connectors. Carefully release the locking tabs on each electrical connector and pull them straight out. The BCM itself is often held in place by locking tabs on the junction block; gently pry them back to release the module.
- Install the New Module: Align the new, pre-programmed BCM with the slot in the junction block and press it firmly into place until the tabs click. Reconnect all electrical connectors, ensuring they are fully seated and the locking tabs engage.
- Final Steps: Reinstall the lower dash panel and reconnect the negative battery terminal. Start the vehicle and test all functions (windows, locks, lights, HVAC, etc.).
Post-Installation Note: In some cases, particularly if you had an airbag light on, you may need to perform a “Setup SDM Primary Key in BCM” procedure using a professional-grade scan tool. This re-syncs the new BCM with the airbag system. A brake pedal position relearn may also be required on certain models.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15878753 and other interchangeable numbers. It is guaranteed to fit the following vehicles (and more):
AVALANCHE 1500 07-11 Body Control (BCM)
ESCALADE & ESV & EXT 07-11 Body Control (BCM)
SIERRA 2500/3500 PICKUP 07-11 Body Control (BCM)
SIERRA DENALI 1500/2500/3500 07-11 Body Control (BCM)
SILVERADO 1500 PICKUP 07-11 Body Control (BCM)
SILVERADO 2500/3500 PICKUP 07-11 Body Control (BCM)
SUBURBAN 1500/2500 07-11 Body Control (BCM)
TAHOE 07-11 Body Control (BCM)
YUKON & YUKON XL 1500/2500 07-11 Body Control (BCM)
Note: For 2007 models, this fits the new body style (smooth door skin).
Frequently Asked Questions
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM is a computer that acts as the central hub for your truck’s body electronics. It controls non-engine related functions like power windows, locks, lights, wipers, the security system, and the HVAC climate control system.
Why is VIN programming so important?
VIN programming loads your vehicle’s specific software and options into the BCM. Without it, the module won’t know how to operate your truck’s features correctly. Our pre-programming service saves you a trip to the dealership and ensures a plug-and-play installation.
Is this a difficult part to install myself?
No, this is one of the easier modules to replace. It’s typically located under the driver’s side dash and requires minimal tools and less than 10 minutes to swap out, making it a great DIY-friendly repair.
What if my airbag light is still on after installation?
If the airbag light remains on, it means the new BCM needs to be electronically introduced to the airbag system’s computer (SDM). This requires a “Setup SDM Primary Key” procedure with a bi-directional scan tool, a common task for any professional repair shop.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your old module without any extra fees or hassle.