Stop Chasing Electrical Gremlins in Your GM Vehicle
Is your 2006-2013 Impala acting possessed? Flickering lights, intermittent power windows, a security system that has a mind of its own, or a dashboard that lights up with random warnings are all classic signs of a failing Body Control Module (BCM). As the central hub for your car’s electronic accessories, when the BCM starts to go, it can create a cascade of frustrating and unpredictable problems. I’ve seen it hundreds of time in my 20 years on the job: owners and even other shops replace part after part, only to find the root cause was the BCM all along.
This isn’t just a replacement part; it’s a permanent solution. We offer a professional BCM Cloning Service that makes this repair easier and more reliable than ever. Instead of getting a generic module that requires expensive dealership programming, you send us your original BCM. We then perform a full data transfer to this fully tested replacement unit. This means your vehicle’s specific VIN, mileage, and key fob information are perfectly mirrored. The result? A true plug-and-play module that restores your car’s functionality right out of the box.
Case Study: A Tricky Diagnosis
A customer brought in a 2011 Impala with a complaint that was baffling two other shops: the radio would randomly turn off, and the driver’s side power lock would only work sometimes. There were no consistent trouble codes, just a generic U0100 ‘Lost Communication’ code that would pop up now and then. We suspected the BCM, as it controls both of those circuits. Instead of just swapping it, we recommended our cloning service. By transferring the original data, we ensured all the vehicle’s unique settings were preserved. After installing the cloned module, both issues were gone for good. The cloning process avoided potential key programming and system sync headaches, saving the customer hundreds in dealership fees.
Common Signs of a Failing BCM
- ✔️ Erratic or non-functional interior and exterior lights.
- ✔️ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔️ The security system light stays on, or the car won’t start due to a false theft alert.
- ✔️ Dashboard gauges behaving erratically or going dead.
- ✔️ Communication-related Diagnostic Trouble Codes (DTCs), such as U0140, U0155, or B1001.
- ✔️ Horn or windshield wipers activating on their own.
Your Straightforward BCM Installation Guide
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to ensure all systems are powered down.
- ✔ Locate the BCM: On the 2006-2013 Impala, the Body Control Module is typically located on the left (driver’s) side of the dashboard, often behind the lower dash panel near the steering column.
- ✔ Remove Connectors: Carefully unplug all electrical connectors from the old BCM. They have locking tabs that need to be depressed. Do not force them.
- ✔ Swap the Module: Unbolt or unclip the old BCM from its mounting bracket and remove it. Install your new, cloned BCM in its place.
- ✔ Reconnect and Test: Plug all connectors firmly back into the new BCM. Reconnect the battery terminal. Start the vehicle and test all body functions (lights, windows, locks, etc.) to confirm the repair.
Important Post-Installation Steps
Our cloning service makes this a near plug-and-play repair, but some GM vehicles may require a simple relearn procedure. Please be aware of the following:
- Airbag System Sync: If your airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is needed. This requires a professional-grade scan tool to sync the modules and clear the light.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure your brake lights and traction control system function correctly.
Disclaimer: Vehicle systems vary. Always refer to a factory service manual or consult a certified technician if you are unsure about any step.
Verified Vehicle Compatibility
This BCM is a direct replacement for part number 20921436 and interchanges with the following part numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921435, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084. It fits a wide range of GM models, including:
AVALANCHE 1500 10
CAPRICE 11-13
CAPTIVA SPORT 12
CTS 08-13
DTS 06-11
ENCLAVE 08-12
EQUINOX 07-09
ESCALADE 10
ESCALADE ESV 10
ESCALADE EXT 10
EXPRESS VANS 08-12
G8 08-09
HUMMER H2 08-09
IMPALA 06-13
LUCERNE 06-11
MONTE CARLO 06-07
OUTLOOK 07-10
SAVANA VANS 08-12
SRX 07-09
STS 10
SUBURBAN 1500 10
TAHOE 10
TORRENT 07-09
TRAVERSE 09-12
VUE 08-10
YUKON 10
YUKON XL 1500 10