Restore Full Control Over Your Truck’s Electronics
Is your 2007-2011 GMC Sierra 2500 acting possessed? Flickering lights, a dead HVAC system, or power windows with a mind of their own are hallmark signs of a failing Body Control Module (BCM). The BCM is the central command center for your truck’s comfort and security features. When it fails, it can cause a cascade of frustrating and seemingly unrelated electrical problems. This replacement module, part number 20939138, is the definitive solution to restore order and reliability to your vehicle.
We make this repair simple with our professional Cloning Service. Instead of shipping you a generic module that requires an expensive trip to the dealership for programming, we transfer the vital data from your original BCM directly to this replacement unit. This includes your vehicle’s VIN, security information, and specific options. The result is a true plug-and-play component, ready for installation the moment it arrives at your door.
A Technician’s Notebook
I recently had a 2010 Sierra 2500 HD in the shop that was a diagnostic nightmare for the owner. The radio would turn on and off, the driver’s side power lock was inoperative, and the airbag light was on with a DTC B1001. The owner had already replaced the battery and checked fuses. After hooking up my scanner, I saw multiple communication loss codes with the BCM. A quick check under the dash revealed the issue: a previous water leak from a bad windshield seal had corroded one of the BCM’s main connectors. While the leak was fixed, the damage to the module was done. Installing one of our cloned BCMs and performing the quick SDM key sync had the truck’s electronics working perfectly in under 15 minutes. It’s a common failure point I’ve seen dozens of times on these GM trucks.
Is Your Sierra 2500 Showing These Electrical Faults?
- ✔ The HVAC blower motor works intermittently or not at all.
- ✔ Power windows, door locks, or interior lights fail to operate correctly.
- ✔ The anti-theft or security system light is illuminated, sometimes preventing the truck from starting.
- ✔ An airbag warning light is on, often with a diagnostic trouble code (DTC) like B1001 (Setup SDM Primary Key Mismatch).
- ✔ Wipers operate erratically or won’t turn off.
- ✔ You’re experiencing strange grounding issues or communication errors between modules.
A Straightforward Guide to Installation
Getting your truck back to normal is easier than you think. This installation typically takes less than 10 minutes.
- Safety First: Always disconnect the negative terminal from your truck’s battery before working on electrical components.
- 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.
- 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 the new, cloned BCM in the same location and securely reconnect all electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Post-Install Checks: Start the vehicle and test all functions: lights, wipers, HVAC, power windows, and locks. Note: Some vehicles may require the post-installation procedures below.
Post-Installation Procedures & Notes
Our cloning service handles the vast majority of the setup. However, due to the complex nature of modern vehicle systems, a couple of simple relearn procedures may be necessary.
- Airbag System Sync: If your airbag light is on after installation, a technician will need to use a professional scan tool to perform the “Setup SDM Primary Key in BCM” function. This syncs the new BCM with the airbag system and is a quick procedure.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure the brake lights and traction control system function correctly.
- Core Policy: Our service is built on cloning your module’s data. You send us your original BCM, we perform the service, and then we ship both your original unit and the ready-to-install replacement back to you. There is no core charge and no need to return the old part afterward.
Verified Vehicle Compatibility
This module is a direct replacement for part number 20939138 and other interchangeable numbers on a wide range of GM trucks and SUVs. While this page focuses on the 2007-2011 Sierra 2500 BCM, it also fits the following vehicles:
ESCALADE 07-11
ESCALADE ESV 07-11
ESCALADE EXT 07-11
SIERRA 1500 PICKUP 07-11
SIERRA 2500 PICKUP 07-11
SIERRA 3500 PICKUP 07-11
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 07-11
SILVERADO 3500 PICKUP 07-11
SUBURBAN 1500 07-11
SUBURBAN 2500 07-11
TAHOE 07-11
YUKON 07-11
YUKON XL 1500 07-11
YUKON XL 2500 07-11
Always verify your part number or consult with us to ensure perfect fitment.
Frequently Asked Questions
What exactly is a “Cloning Service”?
Cloning is a precise data transfer process. We read the essential vehicle-specific data (like VIN, security codes, and mileage) from your original BCM and write it directly onto the replacement module. This makes the new part an exact electronic match to your old one, eliminating the need for dealership programming.
Do I have to send you my original part?
Yes. For the cloning service to work, we need your original module to extract the unique data for your truck. Once the service is complete, we will return your original module along with your newly programmed replacement.
What if my airbag light is on after I install the new BCM?
This is a known possibility and is easily resolved. It means the new BCM needs to be electronically introduced to the airbag system (SDM). A mechanic with a bi-directional scan tool can perform the “Setup SDM Primary Key in BCM” procedure in a few minutes to clear the light.
Is this a difficult part to install myself?
Not at all. For most DIYers, this is a very straightforward job. The BCM is typically held in place by simple clips or a couple of bolts under the dashboard and requires no special tools to swap out. The entire process often takes less than 10 minutes.
My part number is slightly different. Will this still work?
Yes, this module is interchangeable with a long list of GM part numbers, including 25844480, 25835966, 15943678, 20939137, and 22860591, among others. Our cloning process ensures it will function correctly in place of any of these compatible parts.