Restore Full Functionality to Your GM Truck with a Pre-Programmed BCM
Are you battling frustrating electrical issues in your 2007-2010 GMC Sierra Denali? Intermittent wipers, malfunctioning power windows, or a persistent airbag light can turn a reliable truck into a daily headache. The Body Control Module (BCM) is the central command center for these systems, and when it fails, it can cause a cascade of seemingly unrelated problems. This genuine OEM-quality BCM, equivalent to part number 20939137, is the definitive solution. We pre-program it to your vehicle’s specific VIN, ensuring it arrives ready for a straightforward, plug-and-play installation, eliminating the need for a costly trip to the dealership.
A Technician’s Notebook: The Grounding Gremlin
I once had a 2008 Silverado in the shop with a classic case of BCM failure symptoms—flickering lights, dead radio, the works. The owner had already replaced the battery and alternator. Before condemning the module, I always check the main BCM ground, which on these trucks is often located on the A-pillar near the driver’s left foot. Sure enough, it was loose and corroded. After cleaning and tightening it, half the problems vanished. However, the power locks remained erratic, and a quick scan showed internal communication errors within the BCM. The intermittent bad ground had caused voltage spikes that damaged the module’s delicate internal circuits over time. We installed a programmed BCM, and the truck was back to 100%. Moral of the story: Always check your grounds during installation to prevent a repeat failure.
Is Your Truck Showing These Symptoms?
- ✔ Power windows, door locks, or interior/exterior lights operating erratically or not at all.
- ✔ HVAC system failures, such as the blower motor not working or being stuck on one speed.
- ✔ An active airbag warning light, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Security system malfunctions, leading to no-start conditions or random alarm activation.
- ✔ Unexplained battery drain or communication errors with other vehicle modules.
- ✔ Erratic wiper and washer functions.
Your 5-Minute Path to a Fully Functional Truck
Installation is a simple process that most DIY mechanics can complete in under 15 minutes with basic hand tools. The BCM is typically located under the driver’s side dashboard, near the steering column.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning work.
- Locate the Module: Find the BCM under the dash. It will have several large electrical connectors attached to it.
- Disconnect and Remove: Carefully unplug all wiring harnesses. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the old BCM and remove it.
- Install the New BCM: Mount your new, VIN-programmed BCM in the same location and securely reconnect all wiring harnesses. You should hear a click as they lock into place.
- Reconnect and Test: Reconnect the negative battery terminal. Start the vehicle and test all body functions (lights, locks, windows, HVAC, etc.) to confirm the repair.
- Post-Install Checks: In some cases, an airbag light may persist. This requires a professional scan tool to perform the “Setup SDM Primary Key in BCM” procedure. Similarly, a brake pedal position relearn might be needed for certain models to ensure proper brake light and traction control operation.
Verified Fitment for Your Truck or SUV
This Body Control Module is a direct replacement for part number 20939137 and other interchangeable numbers. It is guaranteed to fit the following GM vehicles:
AVALANCHE 1500 08-09 Body Control (BCM); (under steering column)
AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 25835966
AVALANCHE 1500 11 Body Control (BCM)
ESCALADE 07-09 Body Control (BCM); (under steering column)
ESCALADE 10 Body Control (BCM); (under steering column), ID 25835966
ESCALADE 11 Body Control (BCM); (under steering column)
ESCALADE ESV 07-09 Body Control (BCM); (under steering column)
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 25835966
ESCALADE ESV 11 Body Control (BCM); (under steering column)
ESCALADE EXT 07-09 Body Control (BCM); (under steering column)
ESCALADE EXT 10 Body Control (BCM); (under steering column), ID 25835966
ESCALADE EXT 11 Body Control (BCM); (under steering column)
SIERRA 1500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 1500 PICKUP 08 Body Control (BCM); (under steering column)
SIERRA 1500 PICKUP 09 Body Control (BCM), (under steering column)
SIERRA 1500 PICKUP 10-11 Body Control (BCM); (under steering column)
SIERRA 2500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 2500 PICKUP 08-11 Body Control (BCM); (under steering column)
SIERRA 2500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SIERRA 3500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 3500 PICKUP 08-11 Body Control (BCM); (under steering column)
SIERRA 3500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SIERRA DENALI 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA DENALI 08-10 Body Control (BCM); (under steering column)
SIERRA DENALI 1500 11 Body Control (BCM); (under steering column)
SIERRA DENALI 2500 11 Body Control (BCM); (under steering column)
SIERRA DENALI 2500 13 Body Control (BCM); (under steering column), ID 25835966
SIERRA DENALI 3500 11 Body Control (BCM); (under steering column)
SIERRA DENALI 3500 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 1500 PICKUP 08-11 Body Control (BCM); (under steering column)
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 2500 PICKUP 09-11 Body Control (BCM); (under steering column)
SILVERADO 2500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SILVERADO 3500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SILVERADO 3500 PICKUP 08 Body Control (BCM), (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
SUBURBAN 1500 07-09 Body Control (BCM); (under steering column)
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 25835966
SUBURBAN 1500 11 Body Control (BCM); (under steering column)
SUBURBAN 2500 07-09 Body Control (BCM); (under steering column)
SUBURBAN 2500 10 Body Control (BCM), (under steering column)
SUBURBAN 2500 11 Body Control (BCM); (under steering column)
TAHOE 07 Body Control (BCM); (under steering column)
TAHOE 08 Body Control (BCM)
TAHOE 09 Body Control (BCM); (under steering column)
TAHOE 10 Body Control (BCM); (under steering column), ID 25835966
TAHOE 11 Body Control (BCM); (under steering column)
YUKON 07 Body Control (BCM); (under steering column)
YUKON 08 Body Control (BCM), (under steering column)
YUKON 09 Body Control (BCM); (under steering column)
YUKON 10 Body Control (BCM); (under steering column), ID 25835966
YUKON 11 Body Control (BCM), (under steering column)
YUKON XL 1500 07-09 Body Control (BCM), (under steering column)
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 25835966
YUKON XL 1500 11 Body Control (BCM); (under steering column)
YUKON XL 2500 07-08 Body Control (BCM), (under steering column)
YUKON XL 2500 09-11 Body Control (BCM); (under steering column)
Frequently Asked Questions
Will I need to have this BCM programmed by a dealer?
No. We program the module to your vehicle’s VIN before shipping. This allows for a simple plug-and-play installation without the need for expensive dealer tools or software.
What is a core charge? Do I need to send my old part back?
There is no core charge for this part. You can keep your original module without any extra fees or hassle, making the replacement process even easier.
My airbag light is on. Will this BCM fix it?
A faulty BCM can cause the airbag light to illuminate with code B1001. Replacing the module should resolve the root cause. However, after installation, the system may require an ‘SDM key sync’ using a professional scan tool to clear the light and fully sync the safety systems.
Is this a difficult part for a DIYer to install?
The physical replacement is one of the easier electronic repairs. It’s typically held in place by a few bolts or clips under the dashboard and requires only basic tools. The most important part, the programming, is already done for you.
What happens if I install this and still have problems?
While this 2007-2010 Sierra Denali BCM will fix issues caused by a faulty module, problems can also stem from wiring, sensors, or poor grounds. We recommend checking the main BCM ground connection during installation. If issues persist, it indicates the fault may lie elsewhere in the vehicle’s electrical system.