If you’re battling bizarre electrical problems in your 2006-2013 Chevy Impala, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Body Control Module (BCM) can turn a reliable car into a source of constant frustration. It’s the central hub for your car’s body electronics—think power windows, door locks, interior lights, security system, and more. When it starts to fail, the symptoms can seem random and unrelated, making diagnosis a real headache.
This isn’t just another part; it’s a complete solution. We take a genuine GM-spec BCM, part number 20839063, and professionally program it with the latest official software updates specifically for your vehicle’s VIN. This means you get a module that is ready for installation right out of the box, eliminating the need for expensive dealership programming or specialized scan tools. Restore your Impala’s functionality and peace of mind with a part you can trust.
Common Signs of a Failing BCM
A faulty BCM can cause a wide range of issues. If your Impala is showing any of these signs, a replacement is likely the answer:
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ The security or anti-theft light stays on, preventing the car from starting.
- ✔ Interior dome lights or dashboard lights flicker or won’t turn off.
- ✔ Horn sounds randomly or doesn’t work at all.
- ✔ Diagnostic trouble codes (DTCs) stored in the system, especially communication codes like U0140 (Lost Communication With Body Control Module).
- ✔ Erratic behavior from the heating and A/C controls.
A Technician’s Notebook: The Haunted Impala
A customer brought in an ’08 Impala with a story I’ve heard a hundred times. The car would randomly not start, the security light would flash, and sometimes the radio would stay on after he locked the doors. He’d already replaced the battery and checked the alternator. After hooking up my scanner, I saw a handful of U-codes pointing to a communication breakdown. In my shop, these “haunted” cars are almost always a BCM failure. The internal circuits degrade over time, causing these intermittent data network errors. We installed a VIN-programmed BCM, and the car has been problem-free ever since. It’s a classic fix for a classic GM issue.
A Straightforward Guide to Installation
Installing your new 2006-2013 Impala BCM is a manageable job for a confident DIYer. For the Impala, the BCM is typically located on the left (driver’s) side of the dash.
- Safety First: Always disconnect the negative terminal from your car’s battery and wait about 10 minutes before starting work.
- Locate the BCM: On most 2006-2013 Impalas, you’ll find the BCM mounted to the left of the steering column, often behind a lower dash panel. You may need to remove this panel for access.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the old BCM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed BCM in the same location and securely plug in all the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘ON’ position (without starting the engine) and test all body functions: lights, locks, windows, etc.
Important Post-Installation Steps
While this module is programmed for your VIN, some vehicle systems may require a quick handshake procedure to recognize the new BCM. Please note the following:
- Airbag System Sync: If your airbag warning light is on after installation, a simple ‘Setup SDM Primary Key in BCM’ procedure is needed. This requires a professional-grade scan tool and 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 your brake lights and traction control system function correctly.
Disclaimer: Procedures can vary slightly by year and model. Always consult a factory service manual for your specific vehicle if you are unsure.
Verified Vehicle Compatibility
This BCM is a direct replacement for part number 20839063 and interchanges with a wide range of other part numbers. It is guaranteed to fit the following vehicles (please verify location notes):
Chevrolet Monte Carlo: 2006-2007 (LH steering column)
And many other GM models including: Acadia, Avalanche, Caprice, Captiva Sport, CTS, DTS, Enclave, Equinox, Escalade, Express, G8, Hummer H2, Lucerne, Outlook, Savana, SRX, STS, Suburban, Tahoe, Torrent, Traverse, Vue, Yukon. Please match your part number or contact us to confirm fitment.
Frequently Asked Questions
Do I need to send my old BCM back?
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 from me?
After you place your order, we will need your vehicle’s 17-digit VIN (Vehicle Identification Number) to program the module correctly before we ship it.
Is this a simple plug-and-play installation?
Yes, for most functions. Because we program it to your VIN, it will control the main features right away. However, as noted above, some systems like the airbag or brake sensor may require a simple relearn procedure with a scan tool.
Will this fix my car’s no-start problem?
If your no-start issue is caused by the anti-theft system (VATS/Passlock) being triggered by a faulty BCM, then yes, this will resolve the problem. The VIN programming ensures the security data matches your keys.
How do I find my original part number?
Your original BCM will have a sticker on it with the part number. You can compare it to the extensive list of compatible numbers provided in this listing to confirm a match.