Restore Your Truck’s Electrical Systems with a Pre-Programmed BCM
If you’re dealing with frustrating electrical issues in your 2007-2013 GM truck or SUV, a failing Body Control Module (BCM) is often the root cause. As the central command for your vehicle’s body electronics, a faulty BCM can create a cascade of problems that seem unrelated. This OEM-quality replacement, part number 20939138, arrives at your door pre-programmed to your vehicle’s specific VIN. This means no expensive trips to the dealership for programming—it’s a true plug-and-play solution designed to get your truck back to 100% functionality quickly and affordably.
From the Diagnostic Bay
I recently had a 2013 GMC Sierra 2500 HD in the shop that was a real head-scratcher for the owner. The radio would turn on and off by itself, the driver’s side power window worked intermittently, and the airbag light was on with a stubborn DTC B1001. The owner had already replaced the window switch and checked fuses. After hooking up my scanner, I saw multiple communication loss codes pointing to the BCM. A failing BCM can cause network interference, leading to these ghost-like problems. We installed a VIN-programmed module, performed the quick ‘Setup SDM Primary Key’ procedure to sync the airbag system, and cleared all codes. The truck’s electrical gremlins were gone for good. This is a classic case where shotgunning parts costs more than a proper diagnosis and the right component.
Is Your Sierra Exhibiting These Electrical Gremlins?
A failing BCM doesn’t always cause a complete shutdown. Often, the symptoms start small and grow worse over time. Here are the most common signs I’ve seen in my 20+ years of experience that point directly to a BCM issue.
- âś” The air conditioning or heater blower motor works sporadically or not at all.
- âś” Your power windows, door locks, or interior lights behave erratically.
- âś” The dreaded airbag warning light is illuminated, often with a B1001 code.
- âś” Your vehicle’s security system acts up, causing no-start or stalling conditions.
- âś” You’re chasing multiple, seemingly random Diagnostic Trouble Codes (DTCs) related to body systems.
- âś” Wipers or exterior lights turn on or off without command.
A Straightforward Guide to BCM Installation
One of the best parts about this module is its simple installation. For most DIYers or professional mechanics, the job takes less than 15 minutes. It’s located in a consistent spot across the GM truck platform.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the BCM: On your Sierra 2500, the BCM is found under the driver’s side of the dashboard, typically to the left of the steering column.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. They have locking tabs, so be gentle. Once disconnected, unclip or unbolt the old BCM and remove it.
- Install the New Module: Seat the new, VIN-programmed BCM into the mounting bracket and securely plug in all the electrical connectors. You’ll hear a click as they lock into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: lights, locks, windows, HVAC, etc.
- Post-Install Sync (If Needed): If the airbag light is on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ function. This re-establishes communication between the new BCM and the airbag system. A ‘Brake Pedal Position Relearn’ may also be required on some models.
Why Choose a VIN-Programmed 2013 Sierra 2500 Body Control Module?
This isn’t just a replacement part; it’s a complete solution. By ordering a module pre-programmed to your VIN, you are ensuring that it has the correct software and calibrations for your truck’s specific options and features. This eliminates communication errors between modules, resolves common DTCs from the start, and provides a level of reliability that a generic, un-programmed part can’t match. Plus, with our no-core-charge policy, you can keep your old part without any hassle.
Verified Vehicle Compatibility List
ESCALADE 07-11
ESCALADE ESV 07-11
ESCALADE EXT 07-11
SIERRA 1500 PICKUP 07-11
SIERRA 2500 PICKUP 07-13
SIERRA 3500 PICKUP 07-13
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 07-13
SILVERADO 3500 PICKUP 07-13
SUBURBAN 1500 07-11
SUBURBAN 2500 07-11
TAHOE 07-11
YUKON 07-11
YUKON XL 1500 07-11
YUKON XL 2500 07-11
Note: For 2007 models, this fits the ‘new style’ with a smooth door skin. Some models in 2010 and 2013 may require matching the ID 25835966. This module interchanges with part numbers 25844480, 20939137, 22860591 and others.
Frequently Asked Questions
Will this BCM really be plug-and-play?
Yes. We program the module to your vehicle’s VIN before shipping. This ensures it works with your existing keys and options, eliminating the need for dealership programming for most functions.
What if the airbag light comes on after I install it?
This is a known security handshake procedure. An advanced scan tool is required to perform a ‘Setup SDM Primary Key in BCM’ function. This syncs the new BCM with the airbag module and is a quick procedure for any professional shop.
Do I need to send my old BCM back?
No. There is absolutely no core charge or return required for this part. You can keep your old module.
What tools are needed for installation?
For the physical swap, you’ll likely only need a basic socket set or trim removal tool to access the module under the dash. The entire process typically takes less than 15 minutes.
How do I know this is the right part for my truck?
This module, 20939138, is a direct replacement for many 2007-2013 GM trucks and SUVs. You can verify fitment by checking the compatibility list on this page or by matching your original part number to one of the interchangeable numbers provided.