Solve Your Truck’s Electrical Gremlins for Good
Is your GMC Sierra, Chevy Silverado, or other GM truck plagued by bizarre electrical issues? One moment the A/C works, the next it doesn’t. The power windows have a mind of their own, and a persistent airbag light is on your dash. As a technician with over 20 years of experience, I’ve seen these exact frustrations hundreds of times. The culprit is almost always a failing Body Control Module (BCM), the central command center for your vehicle’s body electronics. This isn’t just an inconvenience; it can affect safety systems and vehicle security. This replacement Body Control Module, part number 15943678, is the definitive solution, provided with our expert cloning service to make your repair simple and permanent.
A Technician’s Notebook: The Misleading Blower Motor
A customer brought in his 2011 Silverado 2500 with an intermittent HVAC blower. He had already replaced the blower motor and the resistor, but the problem persisted. His scanner showed no specific codes for those parts. After a quick check, I noticed his dome light would also flicker occasionally when using the turn signal. This pointed me directly to the BCM. A failing BCM can send erratic voltage signals, making perfectly good components seem faulty. We performed our cloning service on a new BCM, installed it in 10 minutes, and all the electrical issues—including the phantom blower problem—were gone. It saved him from chasing a problem that wasn’t there and restored full functionality to his truck.
Is Your GM Truck Showing These Symptoms?
- ✔ Strange electrical behavior: Power windows, door locks, or interior/exterior lights work intermittently or not at all.
- ✔ HVAC system malfunctions: The air conditioning or heater controls are unresponsive, or the blower motor cuts out randomly.
- ✔ Annoying warning lights: The airbag light is illuminated, often with a DTC B1001 (Setup SDM Primary Key in BCM) stored in the system.
- ✔ Security and starting problems: The factory alarm system acts up, or the vehicle experiences stalling, misfires, or no-start conditions due to immobilizer communication failures.
- ✔ A flood of diagnostic trouble codes (DTCs) related to body, communication (U-codes), or security systems.
The Power of Our Cloning Service
Why choose our service? Because we eliminate the most expensive and time-consuming part of the repair: dealership programming. When you order, you’ll send us your original BCM. We then transfer its specific VIN, security information, and option content to this new module. This “cloning” process makes the replacement 100% plug-and-play. It will recognize your existing keys and sync perfectly with the other modules in your 2013 Sierra 2500 BCM network, like the ECU and SDM (Airbag Module). You get a reliable, OEM-spec part that’s ready to install right out of the box, saving you hundreds in dealership fees.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the BCM: On most compatible GM trucks and SUVs, the BCM is located under the driver’s side dashboard, near the steering column. It’s a black box with several large electrical connectors.
- ✔ Remove the Old Module: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once unplugged, unbolt or unclip the module from its mounting bracket.
- ✔ Install the New Module: Seat the newly cloned BCM into the mounting bracket and securely plug in all the electrical connectors until they click.
- ✔ Reconnect and Test: Reconnect the battery terminal. Start the vehicle and test all functions: lights, wipers, locks, windows, and HVAC to confirm the repair is successful.
- ✔ Post-Installation Checks: If your airbag light remains on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. Similarly, a ‘Brake Pedal Position Relearn’ may be required on some models.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15943678 and other interchangeable numbers across a wide range of GM vehicles. While this is a perfect fit for a 2013 Sierra 2500 BCM replacement, please verify your specific model and year from the list below. This part is compatible with part numbers: 25835966, 15263363, 15263497, 15878753, 15284816, 15926094, 15940214, 25790508, 25790509, 25823558, 25823559, 25835965, 25844479, 25971916, 25971917, 15901388, 20939137, 20939138, 22860591.
ESCALADE EXT 10 Body Control (BCM); (under steering column), ID 25835966
SIERRA 2500 PICKUP 08-11 Body Control (BCM); (under steering column)
SIERRA DENALI 2500 11 Body Control (BCM); (under steering column)
SIERRA DENALI 3500 13 Body Control (BCM); (under steering column), ID 25835966
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 25835966
SUBURBAN 2500 10 Body Control (BCM), (under steering column)
YUKON XL 2500 09-11 Body Control (BCM); (under steering column)
ESCALADE EXT 07-09 Body Control (BCM); (under steering column)
SIERRA 3500 PICKUP 08-11 Body Control (BCM); (under steering column)
TAHOE 07 Body Control (BCM); (under steering column)
YUKON 07 Body Control (BCM); (under steering column)
ESCALADE EXT 11 Body Control (BCM); (under steering column)
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 25835966
AVALANCHE 1500 08-09 Body Control (BCM); (under steering column)
SILVERADO 1500 PICKUP 08-11 Body Control (BCM); (under steering column)
TAHOE 09 Body Control (BCM); (under steering column)
SIERRA 1500 PICKUP 10-11 Body Control (BCM); (under steering column)
SIERRA 2500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SILVERADO 2500 PICKUP 09-11 Body Control (BCM); (under steering column)
SUBURBAN 2500 07-09 Body Control (BCM); (under steering column)
YUKON 11 Body Control (BCM), (under steering column)
ESCALADE 11 Body Control (BCM); (under steering column)
ESCALADE ESV 11 Body Control (BCM); (under steering column)
SUBURBAN 1500 07-09 Body Control (BCM); (under steering column)
AVALANCHE 1500 07 Body Control (BCM), (under steering column)
SIERRA 3500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SILVERADO 3500 PICKUP 08 Body Control (BCM), (under steering column)
TAHOE 10 Body Control (BCM); (under steering column), ID 25835966
YUKON 08 Body Control (BCM), (under steering column)
YUKON 09 Body Control (BCM); (under steering column)
SIERRA 3500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SIERRA DENALI 2500 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 3500 PICKUP 09-11 Body Control (BCM); (under steering column)
SILVERADO 3500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
TAHOE 08 Body Control (BCM)
YUKON XL 2500 07-08 Body Control (BCM), (under steering column)
SIERRA DENALI 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA DENALI 1500 11 Body Control (BCM); (under steering column)
SILVERADO 2500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
YUKON 10 Body Control (BCM); (under steering column), ID 25835966
YUKON XL 1500 07-09 Body Control (BCM), (under steering column)
YUKON XL 1500 11 Body Control (BCM); (under steering column)
AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 25835966
SIERRA 2500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
ESCALADE 07-09 Body Control (BCM); (under steering column)
SIERRA 1500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 1500 PICKUP 09 Body Control (BCM), (under steering column)
SIERRA DENALI 3500 11 Body Control (BCM); (under steering column)
SUBURBAN 2500 11 Body Control (BCM); (under steering column)
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 25835966
SIERRA 1500 PICKUP 08 Body Control (BCM); (under steering column)
SIERRA DENALI 08-10 Body Control (BCM); (under steering column)
SUBURBAN 1500 11 Body Control (BCM); (under steering column)
ESCALADE 10 Body Control (BCM); (under steering column), ID 25835966
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 3500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
AVALANCHE 1500 11 Body Control (BCM)
TAHOE 11 Body Control (BCM); (under steering column)
What is a BCM cloning service?
What is a BCM cloning service?
Our cloning service involves transferring the essential data (VIN, security info, and vehicle options) from your original, faulty BCM to this replacement unit. This makes the new module a perfect electronic match for your truck, allowing for simple plug-and-play installation without any need for expensive dealership programming.
Do I need to program this module at the dealership?
No. The cloning service completely handles the programming. Once you receive the module from us, it is ready to be installed directly into your vehicle without any further steps or trips to a mechanic or dealer.
What if my airbag light is on after installation?
This is a known possibility. If the airbag light appears, it means the BCM needs to be synced with the Sensing and Diagnostic Module (SDM). This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ function, which is a quick procedure for any qualified technician.
Will I get my original module back?
Yes, absolutely. We always return your original module along with the newly programmed replacement unit. We do not keep customer cores.
Is this part difficult for a DIYer to install?
The physical installation is very straightforward for most DIY enthusiasts. It typically involves removing a few dash panels and unplugging connectors, usually taking less than 30 minutes with basic hand tools. The key is our cloning service, which removes the difficult programming step.