Tired of Unpredictable Electrical Problems in Your GM Truck?
If you’re dealing with a 2013 GMC Sierra 3500 or another compatible GM vehicle where the lights flicker, the power windows have a mind of their own, or the dashboard is lit up with warning lights, the Body Control Module (BCM) is often the culprit. As the central command for your truck’s body electronics, a failing BCM can cause a cascade of frustrating and seemingly unrelated issues. This isn’t just an inconvenience; it can affect vehicle security and safety systems. This replacement module, part number 25790508, is the definitive solution to restore order and reliability to your vehicle.
What makes our service unique is our professional Cloning Service. Instead of just programming the module with your VIN, we perform a direct data transfer from your original BCM to this replacement unit. This process copies all the specific settings, key data, and configurations unique to your truck. The result is a true plug-and-play component that eliminates the need for expensive dealership programming or complex relearn procedures. You get a module that is perfectly matched to your vehicle’s existing systems, ensuring seamless integration and performance from the moment you install it.
A Technician’s Notebook
I had a 2011 Silverado 2500 in my bay last month that was a textbook case of BCM failure. The customer complained of the radio turning off randomly and the driver’s side power lock not working. A basic scan showed a few communication codes, but nothing pointed directly to one component. From experience, I know these intermittent, multi-system electrical gremlins on the GMT900 platform almost always lead back to the BCM or a poor ground. We checked the main BCM ground connection—it was solid. By swapping in a cloned BCM, all the ghost-like issues vanished instantly. It saved hours of chasing wires and provided a permanent fix.
Is Your Truck Showing These Symptoms?
- ✔ The HVAC blower motor works intermittently or not at all.
- ✔ Your airbag warning light is illuminated, often with DTC B1001 (Setup SDM Primary Key in BCM).
- ✔ Power accessories like windows, door locks, or interior/exterior lights are failing or acting erratically.
- ✔ The anti-theft or security system malfunctions, causing no-start or stalling conditions.
- ✔ You’re seeing a variety of communication or body-related Diagnostic Trouble Codes (DTCs).
- ✔ Unexplained battery drain when the vehicle is off.
Your Straightforward BCM Installation Guide
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the BCM: On most of these GM trucks and SUVs, the BCM is located under the driver’s side of the dashboard, near the steering column. You may need to remove a lower dash panel for access.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unclip or unbolt the module from its mounting bracket.
- ✔ Install the New Module: Seat the replacement BCM into the mounting bracket and securely plug in all the electrical connectors. You’ll hear a click when they are properly seated.
- ✔ Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: lights, wipers, locks, windows, and HVAC to confirm the repair was successful.
- ✔ Post-Installation Checks: If the airbag light remains on, a professional scan tool is required to perform the “Setup SDM Primary Key in BCM” function. A Brake Pedal Position relearn may also be necessary on some models.
Verified Fitment for Your GM Truck or SUV
This BCM is a direct-fit replacement for a wide range of General Motors vehicles. It is interchangeable with part numbers 25835966, 15263363, 15263497, 15878753, 15284816, 15943678, 15926094, 15940214, 25790509, 25823558, 25823559, 25835965, 25844479, 25971916, 25971917, 15901388, 20939137, 20939138, and 22860591. Please verify your part number or contact us to ensure compatibility for models including:
- Chevrolet Avalanche, Silverado, Suburban, Tahoe (2007-2013)
- GMC Sierra, Sierra Denali, Yukon, Yukon XL (2007-2013)
- Cadillac Escalade, ESV, EXT (2007-2011)
Frequently Asked Questions
How does the Cloning Service work?
After you place your order, you will send us your original Body Control Module. Our technicians will use specialized equipment to read the unique data from your module and write it directly onto the replacement unit. This ensures all your vehicle’s specific options and security information are preserved for a true plug-and-play installation.
Do I need to send my original BCM to you?
Yes, the cloning service requires your original module to extract the necessary data. We will return your original module to you along with the newly programmed replacement. There is no core charge.
Will this fix my airbag light with code B1001?
A faulty BCM is a common cause of the B1001 code. Replacing it often resolves the issue. However, if the light stays on after installation, the ‘Setup SDM Primary Key in BCM’ procedure must be performed with a compatible high-end scan tool to sync the airbag system.
Is this a difficult part for a DIYer to install?
The physical replacement is very straightforward and typically takes less than 15 minutes with basic tools. It’s located under the dash and is easy to access. Our cloning service handles the difficult programming part, making this an excellent job for a DIY enthusiast.
What if I have other electrical problems after installation?
While this BCM will solve issues caused by a faulty module, it won’t fix problems from other sources like bad wiring, faulty switches, or poor grounds. We always recommend checking the main ground connections near the BCM during installation as a preventative measure.