Is your Buick Lucerne or other GM vehicle suffering from strange and frustrating electrical problems? Flickering lights, malfunctioning power windows or locks, a security system that acts on its own, or even a no-start condition can often be traced back to a single component: a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s body electronics, and when it fails, it can cause a cascade of confusing issues. This isn’t just an inconvenience; it can be a major disruption to your daily life. Stop chasing electrical gremlins and get a definitive solution.
This is a direct-fit replacement Body Control Module, part number 20921436, for a wide range of GM vehicles, including the 2006-2011 Buick Lucerne. The most significant benefit of our service is that we program the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This means you receive a part that is truly ready for installation, eliminating the need for an expensive trip to the dealership for programming. We flash it with the latest GM software updates, ensuring optimal performance and compatibility. Simply provide your VIN after purchase, and we’ll handle the complex part, saving you time, money, and hassle.
We had a 2008 Impala come into the shop with the most bizarre symptoms. The owner said the radio would randomly turn off, the driver’s side power window wouldn’t work on Tuesdays (yes, really), and the anti-theft light would flash intermittently, sometimes preventing the car from starting. We checked grounds, wiring harnesses, and individual switches, but everything tested fine. On a hunch, we connected a high-end scan tool and tried to communicate with the BCM. The connection was unstable and kept dropping. That was our smoking gun. A faulty BCM was corrupting the data network. We replaced it with a VIN-programmed unit like this one, and every single one of the owner’s ‘haunted car’ problems vanished instantly. It’s amazing how one module can control so much.
Common Symptoms of a Failing BCM
- ✔ Erratic or non-functional interior and exterior lights (headlights, dome lights, etc.).
- ✔ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔ The security system engaging randomly or preventing the vehicle from starting.
- ✔ Dashboard warning lights appearing for no reason.
- ✔ Inconsistent or non-operational radio and climate controls.
- ✔ A complete no-start condition where the starter doesn’t even click.
- ✔ Communication errors with diagnostic scan tools.
Your Plug-and-Play 2006-2011 Lucerne BCM Solution
Don’t let a faulty module keep your car off the road. This replacement 2006-2011 Lucerne BCM is the reliable and cost-effective way to restore your vehicle’s full electronic functionality. By programming the unit to your VIN, we ensure that it correctly communicates with your vehicle’s other modules, like the Engine Control Module (ECM) and Transmission Control Module (TCM), right out of the box. Installation is straightforward for a DIY mechanic or any professional technician. While the core programming is done, some vehicles may require simple, on-vehicle relearn procedures after installation to sync specific subsystems. These are typically performed with a professional scan tool.
Post-Installation Procedures
Please be aware of the following potential requirements after installing your new BCM:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is necessary. This syncs the new BCM with the airbag system and must be done with a compatible diagnostic tool. This is only required if the light is on.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be needed to ensure proper operation of the brake lights and traction control system.
Disclaimer: Specific procedures can vary by vehicle. Always consult a factory service manual or a qualified technician for guidance.
This module is a direct replacement for an extensive list of part numbers, ensuring wide compatibility. The compatible part numbers include: 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, and 95151084.
Frequently Asked Questions
What does a Body Control Module do?
The BCM is a computer that acts as the central hub for your car’s body electronics. It controls non-engine related functions like power windows, locks, lights, wipers, security system, and climate controls by interpreting inputs from switches and sending commands to the appropriate components.
Do I need to program this module?
No. The main benefit of our service is that we program the module for you using the VIN you provide. This makes the installation process much simpler and saves you from needing to have it programmed at a dealership.
What happens if I don’t provide my VIN?
Providing your VIN is mandatory for this part. We cannot ship the BCM without it, as the programming is essential for the module to function correctly in your specific vehicle. After your purchase, please send us your VIN promptly to avoid delays.
Is this BCM difficult to install?
The physical installation is typically straightforward. On a 2006-2011 Lucerne, the BCM is located on the right side of the dash. It involves disconnecting the battery, removing some trim panels, and unplugging the old module to plug in the new one. However, some post-installation sync procedures, like for the airbag system, may require a professional scan tool.
Will this fix my specific electrical problem?
If your vehicle’s symptoms match the common signs of BCM failure and your mechanic has diagnosed the BCM as the faulty component, this part is the correct solution. It’s designed to resolve issues caused by a malfunctioning original BCM.