Restore Your Truck’s Electrical System with a Perfectly Matched BCM
Is your GMC Sierra 3500 acting possessed? Flickering lights, a dead instrument cluster, or power windows with a mind of their own are classic signs of a failing Body Control Module (BCM). The BCM is the nerve center for your truck’s comfort and security features, and when it fails, it can cause a cascade of frustrating and hard-to-diagnose problems. This replacement BCM, corresponding to part number 25790509, is the definitive solution for restoring full functionality to your vehicle.
Unlike a standard off-the-shelf part, this module comes with our professional Cloning Service. You send us your original BCM, and we transfer its exact data—including VIN, mileage, and specific options—to this replacement unit. The result is a true plug-and-play component that requires no expensive trip to the dealership for programming. It’s the most reliable way to ensure every feature works just as it did from the factory.
A Technician’s Notebook: The Grounding Gremlin
I once had a 2009 Sierra 2500 in my bay that was driving the owner crazy. The radio would cut out, the dash lights would flicker on bumps, and occasionally it wouldn’t start. He’d already replaced the battery and alternator. After checking the main power feeds, I went straight for the BCM grounds under the dash. Sure enough, the main G218 ground point was loose and corroded. This intermittent connection had slowly damaged the BCM over time. We replaced the module with a cloned unit and properly cleaned and secured the ground. It’s a five-minute check that I tell every customer to do—it can save you from a world of electrical headaches and prevent repeat failure of your new 2007-2011 Sierra 3500 BCM.
Is Your Truck Showing These Symptoms?
- ✔ Unresponsive or erratic power windows, door locks, and interior lights.
- ✔ HVAC system failures, such as a blower motor that won’t turn on or stays stuck on high.
- ✔ An active airbag warning light, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Security system faults, leading to no-start or stalling conditions.
- ✔ False warnings on the driver information center (DIC).
- ✔ Communication errors with other modules on the CAN bus network.
A Straightforward Guide to BCM Replacement
- ✔ Step 1: The Cloning Process. After purchase, you will ship your original BCM to us. Our technicians will professionally clone all necessary data to the new module. We then ship both your original module and the ready-to-install replacement back to you.
- ✔ Step 2: Safety First. Always disconnect the negative terminal from your truck’s battery before starting any electrical work.
- ✔ Step 3: Locate the BCM. On most 2007-2011 Sierra models, the BCM is located under the driver’s side of the dashboard, near the steering column. It’s a black box with several large multi-pin connectors.
- ✔ Step 4: Swap the Modules. Carefully disconnect the electrical connectors from the old BCM. Unbolt or unclip the module from its mounting bracket and remove it. Install the newly cloned BCM in its place, reconnecting all electrical connectors securely.
- ✔ Step 5: Post-Installation Checks. Reconnect the battery terminal. Start the vehicle and test all functions: lights, wipers, locks, windows, and HVAC. If the airbag light is on, a ‘Setup SDM Primary Key in BCM’ procedure may be needed with a capable scan tool. Some models may also require a Brake Pedal Position Relearn.
Guaranteed Fitment for Your GM Truck
This module is a direct replacement for part number 25790509 and interchanges with several other part numbers. It is designed for a wide range of GM trucks and SUVs. Please verify your part number or consult the list below.
ESCALADE & ESCALADE ESV/EXT 07-11
SIERRA 1500 PICKUP 07-11 (New body style for 07)
SIERRA 2500 PICKUP 07-11 (New body style for 07)
SIERRA 3500 PICKUP 07-11 (New body style for 07)
SIERRA DENALI 1500/2500/3500 07-11
SILVERADO 1500 PICKUP 07-11 (New body style for 07)
SILVERADO 2500 PICKUP 07-11 (New body style for 07)
SILVERADO 3500 PICKUP 07-11 (New body style for 07)
SUBURBAN 1500/2500 07-11
TAHOE 07-11
YUKON & YUKON XL 1500/2500 07-11
Note: Some 2010-2013 models may use a different ID. Please match your part number.
Frequently Asked Questions
Frequently Asked Questions
Do I need to send my original BCM to you?
Yes. This is a cloning service. We require your original module to extract the vehicle-specific software and security information. This guarantees 100% correct functionality without any additional programming.
Will I get my old part back?
Absolutely. We always return your original module along with the newly programmed replacement. There is no core charge or need to keep your old part.
What if my airbag light is on after installation?
This can happen occasionally. It means the BCM and the airbag system (SDM) need to be re-synced. A professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ function. This is a simple procedure for most repair shops.
Is this a difficult part to install myself?
The physical installation is very straightforward for a DIYer with basic tools. It’s typically held in by a few bolts or clips and is accessible under the dash. The entire swap usually takes less than 30 minutes.
Disclaimer: Vehicle systems and repair procedures can vary. Always consult a factory service manual or a certified technician if you are unsure about any step of the process.