Restore Your Car’s Brain and End Electrical Chaos
Are you chasing electrical gremlins in your 2006-2007 Chevrolet Monte Carlo? One minute the power windows work, the next they don’t. The security light is flashing, the interior lights are flickering, or worse, the car refuses to start. As a technician with over two decades of experience, I’ve seen these exact issues hundreds of times. The culprit is almost always a failing Body Control Module (BCM)—the central computer for all your car’s comfort and convenience features. When it goes bad, it can make your vehicle feel possessed. This isn’t just an annoyance; it can affect safety systems and leave you stranded.
This isn’t just a replacement part; it’s a complete solution. We take a reliable BCM, part number 20935349, and program it specifically to your car’s Vehicle Identification Number (VIN) before we ship it. This means it arrives loaded with the latest GM software updates, ready for a straightforward installation. You get to skip the expensive dealership visit and the hassle of programming a blank module. This is the definitive fix to get your Monte Carlo’s electronics functioning like new again.
A Technician’s Notebook: The Monte Carlo with a Mind of its Own
A customer brought in a 2007 Monte Carlo SS with a list of bizarre complaints. The radio would switch off randomly, the ‘Service Theft System’ message kept appearing, and sometimes the car wouldn’t crank. They had already replaced the battery and checked the alternator. My initial scan showed a slew of communication error codes (U-codes) pointing to the BCM. Instead of just guessing, we monitored the data stream from the 2006-2007 Monte Carlo BCM and saw erratic voltage outputs to various circuits. This confirmed internal failure. Installing a VIN-programmed BCM like this one resolved all issues in under an hour, saving the customer from endless diagnostic fees.
Common Signs of a Failing BCM
If you’re experiencing any of the following, a faulty BCM is the likely cause. Replacing your 2006-2007 Monte Carlo BCM can be the one-step fix you need.
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ The security or anti-theft light stays on, preventing the car from starting.
- ✔ Dashboard lights or headlights flicker or work intermittently.
- ✔ The horn honks unexpectedly or doesn’t work at all.
- ✔ Communication error codes, such as U0140 (Lost Communication With Body Control Module).
- ✔ Parasitic battery drain that kills your battery overnight.
- ✔ Wipers or climate control functions behaving unpredictably.
Your Straightforward BCM Installation Guide
For the 2006-2007 Monte Carlo, the BCM is located to the left of the steering column. While professional installation is always an option, a confident DIYer can handle this job.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10 minutes to allow capacitors to discharge.
- Locate the BCM: On your Monte Carlo, you’ll need to remove the lower dash panel beneath the steering wheel to access the module. It’s typically mounted with a few small bolts or clips.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs, so be gentle to avoid breaking them. Once disconnected, unbolt the old BCM and remove it.
- Install the New Module: Mount your new, pre-programmed BCM in the same location. Reconnect all the electrical harnesses securely, ensuring each one clicks into place.
- Post-Installation Steps: Reconnect the battery. While the module is programmed, your vehicle may require a couple of simple relearn procedures. A ‘Brake Pedal Position Relearn’ or an ‘Airbag System Sync’ might be necessary if related warning lights appear. This can often be done with a high-end scan tool.
- Final Check: Start the vehicle and test all body functions—windows, locks, lights, wipers, etc.—to confirm the repair was successful.
Verified Vehicle Compatibility List
This BCM is a direct replacement for part number 20935349 and other interchangeable numbers listed below. It is guaranteed to fit the following vehicles, among others:
- CHEVROLET MONTE CARLO (2006-2007): Body Control (BCM); (LH steering column)
- CHEVROLET IMPALA (2006-2012): Body Control (BCM); (LH dash)
- CHEVROLET EQUINOX (2007-2009): Body Control (BCM); (center dash)
- CADILLAC DTS (2006-2011): Body Control (BCM); (RH center dash)
- GMC ACADIA (2007-2012): Body Control (BCM); (LH dash)
- And many other GM cars, trucks, and vans as detailed in the full fitment list. Please verify your original part number is on our 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.
Do I need to do any programming myself?
Do I need to do any programming myself?
No. This is the key benefit of our service. We program the 2006-2007 Monte Carlo BCM to the VIN you provide during checkout. It arrives ready to be installed, with no dealer flashing required.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot ship the module until we receive this information, as the programming is specific to your vehicle.
Do I need to return my old BCM?
No, there is absolutely no core charge for this part. You can keep your old module, which is helpful if you ever need to reference its part number.
What if my airbag light comes on after installation?
This is a possibility. If the airbag light illuminates, it means the new BCM needs to be synced with the airbag’s computer (SDM). A professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.
Is a brake pedal position relearn always necessary?
Not always, but it is common. This procedure ensures your brake lights and traction control system work correctly with the new BCM. It’s a quick recalibration that can be done with a compatible diagnostic tool.