Fix Your Truck’s Electrical Headaches for Good
If you’re dealing with frustrating and unpredictable electrical problems in your GM truck or SUV, you know how quickly it can disrupt your day. One minute the A/C works, the next it doesn’t. Your power windows have a mind of their own, and a persistent airbag light is staring you down. These aren’t separate issues; they’re classic signs of a failing Body Control Module (BCM). This OEM-quality BCM, equivalent to part number 20939137, is the definitive, hassle-free solution. We pre-program it to your vehicle’s VIN, so it arrives ready for a true plug-and-play installation, getting you back on the road without a mandatory trip to the dealership.
Is Your Truck Showing These Symptoms?
- ✔️ Intermittent or non-working HVAC and climate controls.
- ✔️ Power windows, door locks, or exterior lights operating erratically or not at all.
- ✔️ An active airbag warning light on the dash, often with a DTC B1001 code stored.
- ✔️ Security system malfunctions that can lead to no-start or stalling conditions.
- ✔️ A cluster of seemingly unrelated diagnostic trouble codes (DTCs) related to body systems.
A Technician’s Notebook: The Grounding Ghost
I had a 2011 Sierra 2500 in the bay last month with a laundry list of complaints: dome lights flickering, radio cutting out, and an intermittent no-crank. The owner had already replaced the battery and alternator. After checking the main power and grounds, everything seemed solid. A scan revealed a dozen communication codes pointing to the BCM. We installed a new VIN-programmed BCM, and most issues vanished. However, the no-crank issue returned a day later. A deeper dive revealed a corroded G218 ground point on the left-hand A-pillar—a common culprit on these trucks. After cleaning and securing that ground, all problems were solved permanently. This is why I always tell customers: when you replace a BCM, take five extra minutes to inspect the main body grounds. It can save you a world of trouble.
A Straightforward Guide to Installation
Replacing the BCM in your truck is one of the easier fixes you can do. It’s designed to be accessible and requires no special tools for the physical swap. Most DIYers can complete the job in under 10 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on electrical components.
- Locate the BCM: On most compatible models, the BCM is located under the driver’s side dashboard, to the left of the steering column.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. They have locking tabs that need to be depressed. Once disconnected, remove the old BCM from its mounting bracket.
- Install the New BCM: Snap the new module into the bracket and firmly reconnect all electrical connectors. You’ll hear a click when they are secure.
- Reconnect and Test: Reconnect the negative battery terminal. Start the vehicle and test all functions: lights, wipers, locks, windows, and HVAC to confirm the repair was successful.
Important Post-Installation Note: In some cases, particularly if you had an airbag light on, the system may require a ‘Setup SDM Primary Key’ procedure using a professional scan tool to sync with the new BCM. Additionally, a Brake Pedal Position Relearn might be needed. And remember, there is no core charge, so you can keep your old part without any hassle.
Will This Fit My Truck?
This Body Control Module is a direct replacement for part number 20939137 and other interchangeable numbers. It is guaranteed to fit a wide range of General Motors trucks and SUVs. Please verify your vehicle in the list below or use our vehicle selector tool to ensure perfect compatibility.
ESCALADE EXT 10 Body Control (BCM); (under steering column), ID 25835966
SIERRA 2500 PICKUP 08-11 Body Control (BCM); (under steering column)
SIERRA DENALI 2500 11 Body Control (BCM); (under steering column)
SIERRA DENALI 3500 13 Body Control (BCM); (under steering column), ID 25835966
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 25835966
SUBURBAN 2500 10 Body Control (BCM), (under steering column)
YUKON XL 2500 09-11 Body Control (BCM); (under steering column)
ESCALADE EXT 07-09 Body Control (BCM); (under steering column)
SIERRA 3500 PICKUP 08-11 Body Control (BCM); (under steering column)
TAHOE 07 Body Control (BCM); (under steering column)
YUKON 07 Body Control (BCM); (under steering column)
ESCALADE EXT 11 Body Control (BCM); (under steering column)
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 25835966
AVALANCHE 1500 08-09 Body Control (BCM); (under steering column)
SILVERADO 1500 PICKUP 08-11 Body Control (BCM); (under steering column)
TAHOE 09 Body Control (BCM); (under steering column)
SIERRA 1500 PICKUP 10-11 Body Control (BCM); (under steering column)
SIERRA 2500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SILVERADO 2500 PICKUP 09-11 Body Control (BCM); (under steering column)
SUBURBAN 2500 07-09 Body Control (BCM); (under steering column)
YUKON 11 Body Control (BCM), (under steering column)
ESCALADE 11 Body Control (BCM); (under steering column)
ESCALADE ESV 11 Body Control (BCM); (under steering column)
SUBURBAN 1500 07-09 Body Control (BCM); (under steering column)
AVALANCHE 1500 07 Body Control (BCM), (under steering column)
SIERRA 3500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SILVERADO 3500 PICKUP 08 Body Control (BCM), (under steering column)
TAHOE 10 Body Control (BCM); (under steering column), ID 25835966
YUKON 08 Body Control (BCM), (under steering column)
YUKON 09 Body Control (BCM); (under steering column)
SIERRA 3500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
SIERRA DENALI 2500 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 3500 PICKUP 09-11 Body Control (BCM); (under steering column)
SILVERADO 3500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
TAHOE 08 Body Control (BCM)
YUKON XL 2500 07-08 Body Control (BCM), (under steering column)
SIERRA DENALI 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA DENALI 1500 11 Body Control (BCM); (under steering column)
SILVERADO 2500 PICKUP 13 Body Control (BCM); (under steering column), ID 25835966
YUKON 10 Body Control (BCM); (under steering column), ID 25835966
YUKON XL 1500 07-09 Body Control (BCM), (under steering column)
YUKON XL 1500 11 Body Control (BCM); (under steering column)
AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 25835966
SIERRA 2500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
ESCALADE 07-09 Body Control (BCM); (under steering column)
SIERRA 1500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
SIERRA 1500 PICKUP 09 Body Control (BCM), (under steering column)
SIERRA DENALI 3500 11 Body Control (BCM); (under steering column)
SUBURBAN 2500 11 Body Control (BCM); (under steering column)
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 25835966
SIERRA 1500 PICKUP 08 Body Control (BCM); (under steering column)
SIERRA DENALI 08-10 Body Control (BCM); (under steering column)
SUBURBAN 1500 11 Body Control (BCM); (under steering column)
ESCALADE 10 Body Control (BCM); (under steering column), ID 25835966
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 3500 PICKUP 07 Body Control (BCM); new style (smooth door skin), (under steering column)
AVALANCHE 1500 11 Body Control (BCM)
TAHOE 11 Body Control (BCM); (under steering column)
Frequently Asked Questions
Frequently Asked Questions
Why is VIN programming so important for a BCM?
VIN programming loads your vehicle’s specific software and configurations onto the BCM. This ensures all electronic features, from your key fobs to the specific options your truck was built with, work correctly right out of the box. It eliminates the need for expensive programming at a dealership.
Is this a job I can do myself?
Absolutely. The physical installation is a simple plug-and-play process that typically takes less than 10 minutes with basic hand tools. The module is easily accessible under the driver’s side dash.
What if my airbag light stays on after installation?
This is uncommon, but if it happens, it means the new BCM needs to be electronically introduced to the airbag system’s computer (SDM). A mechanic with a professional bi-directional scan tool can perform the ‘Setup SDM Primary Key in BCM’ function to clear the light.
Does this part have a core charge?
No. We do not require you to send your old module back. There is no core charge, saving you time and money.
What other part numbers does this BCM replace?
This module is a direct replacement for many part numbers, including 20939137, 25844480, 25835966, 15943678, 22860591, and others listed in the product details.
Don’t let electrical gremlins dictate when your truck works properly. This pre-programmed 2011 Sierra Denali 2500 BCM is the reliable, cost-effective way to restore your vehicle’s functions and your peace of mind. Order yours today and get back to a dependable ride.