Restore Your Buick’s Electrical System and Drive with Confidence
Is your 2006-2011 Buick Lucerne experiencing a baffling array of electrical problems? One minute the power windows work, the next they don’t. The security light stays on, or the interior lights flicker for no reason. As a technician with over two decades of diagnostic experience, I can tell you these aren’t random glitches—they’re classic signs of a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s comfort and convenience features, and when it starts to go, it can make your car feel unreliable and frustrating.
Instead of facing a costly trip to the dealership for a new module and expensive programming fees, we offer a smarter, more direct solution. This is a dependable replacement BCM, and the purchase includes our professional cloning service. You simply send us your original BCM, and we transfer all the critical vehicle-specific data—including your VIN and security information—to this replacement unit. We then ship both modules back to you. The result is a fully functional, plug-and-play component that restores your car’s operations without any need for dealer intervention.
Is Your Buick Showing These Symptoms? Common BCM Failure Signs
- ✔ Power windows, door locks, or mirrors operating intermittently or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The anti-theft or security system light is illuminated on the dash, possibly causing a no-start condition.
- ✔ Inaccurate or erratic gauge readings on the instrument cluster.
- ✔ Remote keyless entry failing to work consistently.
- ✔ Diagnostic trouble codes related to communication errors, such as U0140 (Lost Communication With Body Control Module).
A Technician’s Notebook
I remember a 2009 Lucerne that came into the shop with a complaint that was driving the owner crazy. Every few days, the car simply wouldn’t start, and the security light would be flashing. Other times, it worked perfectly. We checked the battery, starter, and ignition switch—all were fine. After connecting the scan tool, I noticed intermittent communication loss with the BCM. On these GM platforms, the BCM is a critical part of the Pass-Key III+ security handshake. We pulled the original BCM, cloned its data to one of our replacement units, and installed it. The problem vanished instantly. It’s a perfect example of how a failing BCM can mimic other, more expensive problems.
Your Straightforward BCM Installation Guide
Installing your cloned 2006-2011 Lucerne Body Control Module is a manageable job for a confident DIYer. Here’s a general guide to get you started:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before beginning work.
- Locate the BCM: On the 2006-2011 Buick Lucerne, the BCM is typically located behind the right side of the dashboard, accessible after removing the glove box assembly.
- Disconnect and Remove: Carefully unplug the electrical connectors from the module. They have locking tabs that need to be depressed. Once disconnected, remove any bolts or clips holding the BCM in its bracket and take it out.
- Install the New Module: Seat the replacement BCM into the mounting bracket and secure it.
- Reconnect and Reassemble: Plug the electrical connectors firmly into the new BCM. You should hear or feel a click. Reinstall the glove box and any other trim pieces you removed.
- Final Steps: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: windows, locks, lights, and wipers to confirm the repair.
Important Post-Installation Notes
While our cloning service handles the main programming, some vehicle systems may require a handshake with the new BCM. Be aware of the following potential procedures:
- Airbag System Sync: If your airbag warning light is on after installation, a professional scan tool is needed to perform the “Setup SDM Primary Key in BCM” procedure. This syncs the airbag system with the new BCM.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure correct brake light operation and to prevent issues with the traction control system.
Disclaimer: Vehicle systems vary. We always recommend consulting a factory service manual or a certified technician for procedures specific to your vehicle.
Verified Vehicle Compatibility
This Body Control Module is a direct replacement for part number 20921436 and interchanges with a wide range of other part numbers. It is guaranteed to fit the following models, among many others:
- Buick Lucerne: 2006-2011 (located on the right side of the dash)
- Cadillac DTS: 2006-2011
- Chevrolet Impala: 2006-2013
- Chevrolet Equinox: 2007-2009
- GMC Acadia: 2007-2012
- Chevrolet Tahoe / Suburban / Avalanche: 2010 (check ID)
- GMC Yukon / Yukon XL: 2010 (check ID)
- Chevrolet Express / GMC Savana Vans: 2008-2012
This module also fits many other GM vehicles. Please verify your original part number against our extensive cross-reference list: 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
What is a BCM cloning service?
Our cloning service is a process where we transfer the exact software and vehicle-specific information (like the VIN and key data) from your original, failing BCM to this replacement unit. This ensures the module is perfectly matched to your car’s options and security system, making the installation plug-and-play.
Do I need to program this module at the dealer?
No. The cloning service completely eliminates the need for dealer programming, saving you significant time and money. It will arrive ready to install right out of the box.
Where is the BCM located on my 2008 Buick Lucerne?
On the 2006-2011 Buick Lucerne, the Body Control Module is found behind the dashboard on the passenger’s side. You can typically access it by removing the glove box.
What is your core policy?
We require your original module to perform the cloning service. After we transfer the data to the replacement unit, we ship both your original module and the newly programmed replacement back to you. We do not keep your original part.
Will this fix my security light and no-start problem?
In many cases, yes. The BCM is integral to the vehicle’s anti-theft system. If the BCM is faulty, it can cause the security light to activate and prevent the engine from starting. A properly cloned BCM will restore this function.