Restore Full Functionality to Your 2007-2011 Sierra 3500 Pickup
If your GMC Sierra 3500 is plagued by bizarre electrical problems—like power windows with a mind of their own, a dead HVAC blower, or a security light that won’t turn off—you’re likely dealing with a failed Body Control Module (BCM). As the central command for your truck’s body electronics, a faulty BCM can cause a cascade of frustrating issues. This replacement module, part number 15878753, is the definitive solution to get your workhorse back in reliable working order, without the exorbitant costs and scheduling hassles of a dealership visit.
This isn’t just a part; it’s a complete service. We perform a professional Cloning Service by transferring the critical data from your original module to this replacement unit. This ensures that all your truck’s specific configurations and security information are perfectly preserved, making for a true plug-and-play installation. Once installed, your Sierra’s essential systems—from interior and exterior lighting to power locks and the anti-theft system—will operate just as they did from the factory.
Is Your Sierra’s BCM Failing? Watch for These Signs
A failing Sierra 3500 Body Control Module can manifest in numerous ways. In my two decades of experience, these are the most common complaints I see from truck owners that point directly to the BCM. If you’re experiencing any of these, it’s time for a replacement.
- ✔ Power windows, mirrors, or door locks operating intermittently or not at all.
- ✔ The HVAC system is unresponsive, or the blower motor works only on certain speeds or not at all.
- ✔ An airbag warning light is illuminated on the dash, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ The security system acts erratically, preventing the truck from starting or causing it to stall.
- ✔ Headlights, taillights, or interior lights flicker, stay on, or refuse to turn on.
- ✔ Communication errors with other modules, leading to a host of seemingly unrelated DTCs.
From the Diagnostic Bay: The Ghost in the Machine
I once had a 2009 Sierra 3500 in the shop that was driving its owner, a contractor, crazy. The truck would randomly refuse to start, the radio would cut out, and the dome light would stay on, draining the battery. He’d already replaced the battery and alternator. After hooking up my scanner, I saw a storm of U-codes (communication errors) but no clear culprit. Experience told me to look at the BCM. We found minor corrosion on one of the BCM connectors from a leaky windshield seal. This small amount of moisture was enough to disrupt the entire CAN bus network. By replacing the BCM and fixing the leak, we solved every single one of his truck’s “ghosts.” It’s a perfect example of how this one module is the key to so many functions.
A Straightforward Guide to Installation
Thanks to our Cloning Service, installing your replacement BCM is a simple process that most DIYers can complete in under 15 minutes. No dealership programming is needed.
- Safety First: Always disconnect the negative terminal from your truck’s battery before working on any electrical components.
- Locate the BCM: On most 2007-2011 Sierra 3500 models, the BCM is located under the driver’s side of the dashboard, to the left of the steering column.
- Remove Connectors: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed to be released. Do not force them.
- Swap the Module: Unbolt or unclip the old BCM from its mounting bracket and install the new, cloned module in its place.
- Reconnect Everything: Plug the electrical connectors firmly into the new BCM until they click into place. Reconnect the negative battery terminal.
- Perform Post-Install Checks: Start the truck and verify that all functions (windows, locks, lights, HVAC) are working correctly. See our FAQ for information on potential airbag light or brake sensor relearn procedures.
Verified Fitment for Your GM Truck
This Body Control Module is a direct replacement for part number 15878753 and is compatible with a wide range of General Motors trucks and SUVs. It is a guaranteed fit for the following models:
- GMC Sierra 3500 Pickup (2007-2011)
- GMC Sierra 1500/2500 Pickup (2007-2013)
- GMC Yukon / Yukon XL (2007-2011)
- Chevrolet Silverado 1500/2500/3500 Pickup (2007-2013)
- Chevrolet Avalanche, Suburban, Tahoe (2007-2011)
- Cadillac Escalade, ESV, EXT (2007-2011)
This module also interchanges with part numbers: 25835966, 15263363, 15263497, 15284816, 15943678, 15926094, 20939137, 22860591 and more. Please verify your part number before ordering.
Frequently Asked Questions
What is the ‘Cloning Service’?
Our Cloning Service involves transferring the exact software, security data, and vehicle-specific options from your original BCM to the replacement unit. This makes the new module a perfect electronic match for your truck, eliminating the need for expensive dealership programming.
Do I need to send my original BCM to you?
Yes. For the cloning process to work, we need your original module. After you place your order, we will provide instructions for sending it to us. We will return your original module along with your newly programmed replacement.
What if the airbag light is on after installation?
In some cases, the new BCM needs to be synced with the airbag system (SDM). This requires a ‘Setup SDM Primary Key in BCM’ procedure, which can be performed by a technician with a professional-grade diagnostic tool. This is only necessary if the light stays on after the swap.
Is there a core charge?
No. We do not require a core deposit because we use your original module for the data transfer and then return it to you. You get to keep your old part.
Will this fix my truck’s no-start issue?
If the no-start condition is caused by the BCM’s control over the anti-theft or fuel pump relay systems, then yes, this will resolve the problem. A proper diagnosis is always recommended to confirm the BCM is the root cause.
What tools do I need for installation?
Typically, you will only need basic hand tools, such as a socket set or a screwdriver, to access and remove the BCM. No special electronic tools are required for the physical installation.