Tired of Chasing Electrical Gremlins in Your GM Truck?
If your GMC Sierra 3500 is acting possessed—with flickering lights, a dead HVAC blower, or random warning messages—you’re not alone. As a technician with over two decades of experience, I’ve seen these exact issues countless times. The culprit is often a failing Body Control Module (BCM), the central command center for your truck’s comfort and convenience features. This isn’t just an annoyance; it can compromise your vehicle’s security and safety. This replacement BCM, part number 15926094, is the definitive solution to restore order and get your truck operating like new.
We take the guesswork and dealer expense out of the equation. Each module is expertly programmed to your vehicle’s specific VIN before it ships. This means no expensive trips to the dealership for programming. It’s a direct-fit, ready-to-install solution for your 2007-2011 Sierra 3500 Body Control Module and a wide range of other GM trucks and SUVs. Stop letting electrical chaos dictate your day and install a reliable, pre-programmed BCM that gets the job done right the first time.
From the Diagnostic Bay: The Misleading Ground Wire
A customer brought in a 2008 Silverado 2500 with a laundry list of complaints: intermittent radio, dome light staying on, and the security light flashing, causing a no-start condition. He’d already replaced the battery and cleaned every ground he could find. His scanner showed a dozen U-codes (loss of communication). In my shop, I’ve learned that while grounds are a common cause, a failing BCM can mimic those exact symptoms by failing to properly manage the data bus network. We installed a VIN-programmed BCM, and every single issue vanished instantly. It saved him hours of further frustrating (and costly) diagnostic time.
Is Your Truck Showing These Symptoms?
A faulty BCM can cause a wide range of frustrating electrical problems. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Unresponsive power windows, door locks, or mirrors.
- ✔ HVAC controls not working or the blower motor operating erratically.
- ✔ The security system malfunctioning, leading to no-start or stalling conditions.
- ✔ An airbag warning light on the dash, often with a DTC B1001 (SDM Mismatch).
- ✔ Interior or exterior lights flickering, staying on, or not working at all.
- ✔ A cluster of communication codes (U-codes) or other body-related DTCs.
Your Straightforward Guide to Installation
Replacing your 2007-2011 Sierra 3500 Body Control Module is a quick job that most DIYers can handle in their own driveway. The BCM is typically located under the driver’s side dashboard, near the steering column.
- Safety First: Always disconnect the negative battery terminal and wait a few minutes before starting any electrical work.
- Locate the BCM: Remove the lower dash panel (knee bolster) below the steering wheel to access the module. It’s a black box with several large electrical connectors.
- Swap the Module: Carefully release the locking tabs on each electrical connector and unplug them. Unbolt or unclip the old BCM from its mounting bracket and remove it.
- Install the New BCM: Mount the new, pre-programmed BCM in place. Securely plug in all electrical connectors until they click, ensuring a solid connection.
- Reconnect & Test: Reinstall the lower dash panel, reconnect the battery terminal, and start the vehicle. Test all functions like lights, locks, windows, and wipers to confirm the fix.
Post-Installation Note: In some cases, particularly if the airbag light was on, a ‘Setup SDM Primary Key’ procedure may be needed using a capable bi-directional scan tool. This re-syncs the new BCM with the airbag system. A brake pedal position relearn might also be required for certain models.
Guaranteed Fitment for Your GM Truck or SUV
This module is a direct replacement for part number 15926094 and is interchangeable with many other part numbers, ensuring broad compatibility. It is verified to fit the following vehicles:
ESCALADE 07-11
ESCALADE ESV 07-11
ESCALADE EXT 07-11
SIERRA 1500 PICKUP 07-11
SIERRA 2500 PICKUP 07-13
SIERRA 3500 PICKUP 07-13
SIERRA DENALI 07-10
SIERRA DENALI 1500 11
SIERRA DENALI 2500 11-13
SIERRA DENALI 3500 11-13
SILVERADO 1500 PICKUP 07-11
SILVERADO 2500 PICKUP 07-13
SILVERADO 3500 PICKUP 07-13
SUBURBAN 1500 07-11
SUBURBAN 2500 07-11
TAHOE 07-11
YUKON 07-11
YUKON XL 1500 07-11
YUKON XL 2500 07-11
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for installation, saving you the time and expense of a dealership visit.
What tools do I need for installation?
Basic hand tools are all that’s required for the physical swap, typically a socket set and a panel removal tool. In some cases, a bi-directional scan tool may be needed for post-installation procedures like an airbag system sync if the warning light is on.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without any hassle or need to return it.
Will this fix my airbag light with code B1001?
A faulty BCM is a common cause of the B1001 code. Replacing the module will likely resolve the root cause, but you will need to perform the ‘Setup SDM Primary Key in BCM’ procedure with a professional scan tool to clear the light after installation.
What if my original part number is different?
This module is a direct replacement for many part numbers, including 25844480, 25835966, 15943678, and others. As long as your vehicle is on the compatibility list, this module will function correctly.