End the Electrical Chaos in Your Traverse
Are you dealing with a vehicle that seems to have a mind of its own? Flickering lights, malfunctioning power windows or locks, a security system that prevents starting, or random warning messages on your dash are all classic signs of a failing Body Control Module (BCM). As the central command center for your vehicle’s body electronics, a faulty BCM can create a cascade of frustrating and unpredictable problems. This isn’t just an annoyance; it can be a serious safety concern when critical systems like lighting and security are compromised.
This replacement Body Control Module is the definitive solution for your 2009-2012 Chevrolet Traverse and a wide range of other GM vehicles. Forget the expensive trip to the dealership and the hassle of getting your vehicle towed for programming. We handle the critical first step for you. Simply provide your vehicle’s VIN during checkout, and our technicians will program the BCM with the latest, most stable software direct from GM. It arrives at your door ready for installation, saving you time, money, and a major headache.
Case Study: A Tricky Diagnosis
I remember a 2011 Traverse that came into my bay with a complaint of the battery dying overnight. The owner had already replaced the battery twice. We ran a parasitic draw test and found a significant drain. After isolating circuits, we traced it back to the BCM, which wasn’t letting the interior lighting and radio circuits go to ‘sleep’ after the key was off. Swapping in a pre-programmed BCM like this one solved the draw instantly. It’s a common failure point I’ve seen dozens of times on these GM platforms.
Is Your Vehicle Showing These Symptoms?
- âś” Intermittent or non-working power windows, door locks, or interior lights.
- âś” Horn honking randomly or not working at all.
- âś” ‘Service StabiliTrak’ or other warning lights appearing without a clear cause.
- âś” The security or anti-theft system light is on, preventing the engine from starting.
- âś” Communication error codes, such as U0140, stored in other modules.
- âś” Wipers turning on by themselves or not responding to the switch.
Your Straightforward BCM Installation Guide
Replacing the BCM in your 2009-2012 Traverse is a manageable job for a confident DIYer. The module is typically located on the left (driver’s) side of the dashboard, often behind the lower trim panel.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Access the Module: Carefully remove any lower dash panels or trim necessary to gain access to the BCM. Refer to a service manual for your specific model for precise panel removal steps.
- Disconnect and Remove: Unplug the electrical connectors from the old BCM. They have locking tabs that must be depressed. Once disconnected, unbolt or unclip the old module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in the exact same position. Reconnect all electrical connectors, ensuring they click securely into place.
- Reconnect and Test: Reattach the negative battery terminal. Turn the key to the ‘On’ position (without starting) and test functions like lights, locks, and windows to confirm operation.
- Perform Relearns (If Needed): Start the vehicle. If you see an airbag light or notice brake system warnings, you may need to perform the post-installation procedures noted below with a capable scan tool.
Post-Installation Notes
While this module is programmed for your VIN, some vehicle security and safety systems may require a ‘handshake’ after installation. This may include:
- Airbag System Sync: If the airbag light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is needed using a professional-grade diagnostic tool.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be necessary to ensure correct brake light and traction control operation.
Disclaimer: Procedures can vary. Always consult a factory service manual or a qualified technician for guidance specific to your vehicle.
Verified Vehicle Compatibility
This BCM is a direct replacement for part number 20921436 and interchanges with a wide array of part numbers across numerous GM models. Please verify your vehicle is on the list below. This module is guaranteed to fit and function in:
- Acadia: 2007-2012
- Avalanche 1500: 2010
- Caprice: 2011-2013
- Captiva Sport: 2012
- CTS: 2008-2013
- DTS: 2006-2011
- Enclave: 2008-2012
- Equinox: 2007-2009
- Escalade / ESV / EXT: 2010
- Express / Savana Vans (1500, 2500, 3500): 2008-2012
- G8: 2008-2009
- Hummer H2: 2008-2009
- Impala: 2006-2013
- Lucerne: 2006-2011
- Monte Carlo: 2006-2007
- Outlook: 2007-2010
- SRX: 2007-2009
- STS: 2010
- Suburban 1500: 2010
- Tahoe: 2010
- Torrent: 2007-2009
- Traverse: 2009-2012
- Vue: 2008-2010
- Yukon / Yukon XL 1500: 2010
This replaces part numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921435, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084
Frequently Asked Questions
Do I need to send my old BCM back?
No, there is absolutely no core charge for this part. You can keep your original module.
What information do you need to program it?
We need your 17-digit Vehicle Identification Number (VIN) to program the module with the correct software and vehicle-specific options from GM. Please provide it during or after checkout.
Is this a difficult part to install myself?
For someone with basic mechanical skills, it is a straightforward replacement. The primary challenge is accessing the module behind the dashboard trim. No special programming tools are required on your end.
Will this fix my ‘Service StabiliTrak’ message?
A faulty BCM is a common cause for this warning message, as it communicates with the traction control system. While this part often resolves the issue, you should always have the vehicle scanned for codes to confirm the diagnosis, as other sensors can also cause this light.
What if my original part number isn’t 20921436 but is on the list?
If your part number is on our interchange list, this module is the correct, updated replacement for your vehicle. GM often consolidates multiple part numbers into a single, new one.