End the Electrical Headaches in Your GM Truck
If you’re dealing with bizarre electrical problems in your 2007-2011 GMC Sierra 2500 or another compatible GM vehicle, a failing Body Control Module (BCM) is the likely culprit. As the central command for your truck’s body electronics, a faulty BCM can cause a cascade of frustrating issues, from flickering lights and a dead HVAC system to security lockouts and false warning lights. This isn’t just an annoyance; it’s a matter of safety and reliability. Stop chasing down individual symptoms and address the root cause with our direct-replacement BCM, part number 20939137.
What is Our Cloning Service?
Forget expensive dealership visits and the hassle of programming. Our unique cloning service makes this repair a true plug-and-play solution. You send us your original BCM, and we professionally transfer all its critical data—including your vehicle’s VIN, mileage, and specific options—to this replacement unit. The result? A module that is a perfect electronic match for your truck. It arrives ready for installation with no further steps needed, saving you hundreds in dealer fees and diagnostic time. We then ship your original module back to you along with the ready-to-install replacement.
From the Diagnostic Bay: The Case of the Ghostly Glitches
I once had a 2009 Sierra 2500 in my shop that was driving the owner crazy. The radio would turn on and off by itself, the driver’s side power window worked only when it wanted to, and the airbag light was on with a DTC B1001. The owner had already replaced the window switch and checked fuses. After confirming the battery and grounds were solid, we hooked up the scanner. We saw communication errors across multiple systems, all pointing back to one component: the BCM. A failing BCM can send corrupt data across the CAN bus, creating these ghost-like problems. By installing a cloned BCM, we restored all functions in under 10 minutes. The new module already had the vehicle’s security data, so the airbag light cleared after the SDM key sync, and all the other gremlins vanished instantly.
Is Your Sierra 2500 Showing These Electrical Faults?
- ✔ The HVAC blower motor works intermittently or not at all.
- ✔ Power windows, door locks, or interior/exterior lights behave erratically.
- ✔ The airbag warning light is illuminated, often with a DTC B1001 code.
- ✔ Your vehicle experiences unexpected stalling, misfires, or security system issues.
- ✔ The anti-theft system prevents the truck from starting.
- ✔ Multiple unrelated diagnostic trouble codes (DTCs) are present.
A Straightforward Guide to Your BCM Replacement
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the BCM: On most GM trucks from this era, 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 BCM: Mount your new, cloned BCM and securely plug in all the electrical connectors. You should hear a click as they lock into place.
- ✔ Reconnect and Test: Reconnect the negative battery terminal. Start the vehicle and test all functions: lights, wipers, HVAC, power windows, and door locks to confirm the repair was successful.
- ✔ Post-Installation Checks: In some cases, an ‘Airbag System Sync’ or ‘Brake Pedal Position Relearn’ may be required if related warning lights appear. This is done with a professional scan tool. See our FAQ for more details.
Verified Vehicle Compatibility List
This BCM is a direct fit for a wide range of General Motors trucks and SUVs. It is interchangeable with part numbers 25835966, 15263363, 15943678, 25844479, 20939138, 22860591, and more. Please verify your part number or contact us to ensure perfect fitment for your specific model.
Fits select models of:
- Chevrolet Avalanche, Silverado 1500/2500/3500, Suburban, Tahoe
- GMC Sierra 1500/2500/3500, Sierra Denali, Yukon, Yukon XL
- Cadillac Escalade, Escalade ESV, Escalade EXT
Our cloning service makes this 2007-2011 Sierra 2500 BCM fully compatible with your vehicle’s existing systems, ensuring a seamless and effective repair.