Restore Your Buick’s Electrical System with a Reliable BCM Solution
Is your 2006-2011 Buick Lucerne acting possessed? Flickering lights, power windows with a mind of their own, a security system that won’t cooperate, or worse, a car that refuses to start? These frustrating and seemingly random electrical gremlins often point to one culprit: a failing Body Control Module (BCM). The BCM is the central command center for your car’s body electronics, and when it starts to go, it can cause system-wide chaos. In my 20+ years of diagnostics, I’ve seen how a bad BCM can turn a reliable car into a source of daily frustration.
Forget expensive dealership visits and the headache of programming a new module from scratch. We offer a straightforward and effective solution. This listing is for a replacement Body Control Module, part number 20839063, that comes ready for installation through our expert cloning service. You send us your original BCM, and we transfer its unique data—like key information and vehicle-specific options—to this replacement unit. We then ship both modules back to you. The result is a true plug-and-play fix that restores your vehicle’s proper function without needing a trip to the dealer for programming.
A Technician’s Notebook: The Case of the Confused Lucerne
A customer brought in an ’08 Buick Lucerne that was driving them crazy. The radio would turn on and off, the interior lights would flicker while driving, and occasionally the car wouldn’t recognize the key fob. They had already replaced the battery and checked the alternator. After hooking up my scan tool, I saw a flurry of communication error codes (U-codes) pointing to the BCM. A visual inspection of the original BCM revealed no obvious water damage, but these modules can fail internally from years of heat cycles and vibrations. By providing a cloned 2006-2011 Lucerne BCM, we had the car’s electronics working perfectly in under an hour of shop time, saving the customer hundreds compared to the dealership’s quote.
Common Signs of a Failing BCM
If you’re experiencing any of the following, a faulty BCM could be the cause. A proper diagnosis is always recommended, but these are classic symptoms:
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Erratic behavior from the instrument cluster gauges or warning lights.
- ✔ Security system faults or the vehicle immobilizer preventing the car from starting.
- ✔ Headlights, taillights, or interior lights not working correctly.
- ✔ Communication loss codes, such as U0140, stored in other modules.
- ✔ A parasitic battery drain that kills your battery overnight.
A Straightforward Guide to Your BCM Swap
Installing your cloned BCM is a manageable job for a DIYer with basic tools. Here’s a general guide for the Buick Lucerne:
- Step 1: Safety First. Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the system to fully discharge before starting any electrical work.
- Step 2: Locate the BCM. In the 2006-2011 Buick Lucerne, the BCM is typically located on the right side of the dash, often accessible by removing the glove box or a lower dash panel.
- Step 3: Disconnect and Remove. Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
- Step 4: Install the New Module. Mount your replacement BCM and securely reconnect all electrical connectors. You should hear a ‘click’ as they lock into place.
- Step 5: Reconnect and Test. Reinstall any panels you removed and reconnect the negative battery terminal. Start the car and test all body functions—windows, locks, lights, wipers, etc.—to ensure everything is working as it should.
Please Note: After installation, some vehicles may require additional relearn procedures. See our FAQ section for more details.
Verified Vehicle Compatibility
This BCM is a direct replacement for part number 20839063 and is compatible with a wide range of General Motors vehicles. Please verify your original part number matches one in the list below. This module fits the following models, among others:
Cadillac: DTS (2006-2011), CTS (2008-2013), Escalade (2010), SRX (2007-2009), STS (2010)
Chevrolet: Impala (2006-2013), Equinox (2007-2009), Tahoe (2010), Express Van (2008-2012), Traverse (2009-2012), Captiva Sport (2012)
GMC: Yukon (2010), Savana Van (2008-2012)
Pontiac: Torrent (2007-2009), G8 (2008-2009)
…and many more. Refer to the comprehensive fitment list and ensure your original module’s part number is listed: 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
Frequently Asked Questions
How does the cloning service work?
After you place your order, you’ll ship your original BCM to us. We use specialized equipment to read the unique programming and security data from your module and write it onto the replacement unit. We then ship both your original module and the ready-to-install replacement back to you.
Do I need to send my VIN number?
No, for this cloning service, we only need your original module. The VIN is part of the data we transfer, so providing it separately isn’t necessary.
Is this a plug-and-play solution?
Yes! Because we clone your original data, the replacement BCM will be recognized by your vehicle’s other computers, eliminating the need for expensive dealer programming.
What if my airbag light comes on after installation?
In some cases, the BCM and Supplemental Restraint System (SRS) module may need to be re-synced. This is done with a professional scan tool using the ‘Setup SDM Primary Key in BCM’ procedure. This is only necessary if the airbag light is illuminated after the swap.
What is the Brake Pedal Position Relearn?
This is a simple calibration that may be required on some models to ensure the brake lights and traction control system function correctly. A qualified technician or a high-end scan tool can perform this procedure if needed.
What is your core policy?
We do not require a core deposit because your original module is required for the cloning process. It will always be returned to you along with the programmed replacement unit.