Finally, A Real Fix for Your Car’s Electrical Gremlins
Are you tired of chasing down bizarre electrical issues in your 2006-2013 Chevrolet Impala or other GM vehicle? One day the power windows don’t work, the next the security light is flashing, or the interior lights have a mind of their own. As a technician with over two decades of experience, I’ve seen these frustrating symptoms hundreds of times. The culprit is often a failing Body Control Module (BCM)—the central command center for your vehicle’s body electronics.
A faulty BCM can turn a reliable car into a source of constant headaches. Instead of paying a fortune at the dealership for a new module and expensive programming fees, we offer a smarter solution. This is a high-quality replacement BCM that comes with our professional Cloning Service. We transfer the critical data from your original module to this replacement unit. The result? A true plug-and-play component that restores full functionality without any need for a trip to the dealer. Just send us your VIN after purchase, and we’ll handle the rest, ensuring it’s loaded with the latest GM software for optimal performance.
Common Signs of a Failing BCM
- âś” Intermittent or non-working power windows, door locks, or mirrors.
- âś” Erratic interior or exterior lights (flickering, staying on, or not turning on).
- âś” The security system acting up, causing no-start conditions or a constantly flashing security light.
- âś” The key fob not responding or working inconsistently.
- âś” False warnings on the instrument cluster (e.g., “Service Theft System”).
- âś” Communication-related Diagnostic Trouble Codes (DTCs), such as U0140, U0155, or other U-codes indicating a loss of communication with the BCM.
A Technician’s Notebook: The Case of the Haunted Impala
A customer brought in a 2011 Impala with a list of complaints that sounded like the car was possessed. The horn would honk randomly, the radio would shut off, and the power locks would cycle while driving. They had already replaced the battery and checked all the fuses. After connecting my scan tool, I found multiple communication loss codes pointing to the BCM. These modules, especially on the W-body platform, are prone to internal circuit board failures from heat cycles and vibration over the years. By installing a cloned 2006-2013 Impala BCM, we solved all the issues in one shot. The cloning service was key, as it saved the customer the time and cost of having the dealer perform a complicated security and key relearn procedure.
A Straightforward Guide to Installation
- âś” Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- âś” Locate the BCM: On the 2006-2013 Impala, the BCM is typically located on the left (driver’s) side of the dash, often near the steering column or behind the lower dash panel. Consult a service manual for your specific model’s location if unsure.
- âś” Remove Trim Panels: Carefully remove any plastic trim panels necessary to access the module. These usually pop off with a trim removal tool.
- âś” Disconnect and Remove: 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.
- âś” Install the New Module: Mount your new, pre-programmed BCM in the same location and reconnect all electrical connectors securely. Ensure they click into place.
- âś” Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘ON’ position and test all body functions—windows, locks, lights, wipers, etc.—to confirm the repair.
Important Post-Installation Steps
Because our service clones your existing data, most vehicles will not require additional procedures. However, in some cases, you may need a professional scan tool to perform one of the following relearns:
- Airbag System Sync: If the airbag light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure is needed to sync the systems.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure proper brake light and traction control operation.
Verified Vehicle Compatibility
This BCM is a direct replacement for part number 20921435 and interchanges with a wide range of other part numbers. It fits many GM vehicles, including but not limited to:
- Chevrolet Impala: 2006-2013
- Chevrolet Monte Carlo: 2006-2007
- Chevrolet Equinox: 2007-2009
- Chevrolet Traverse: 2009-2012
- Chevrolet Tahoe/Suburban/Avalanche: 2010 (check ID)
- Chevrolet Express Van: 2008-2012
- GMC Acadia: 2007-2012
- GMC Yukon / Yukon XL: 2010 (check ID)
- GMC Savana Van: 2008-2012
- Cadillac DTS/CTS/SRX/Escalade: Various years, check fitment list.
- Buick Lucerne/Enclave: Various years, check fitment list.
- And many more models listed in the full compatibility chart. Always verify your original part number.
Frequently Asked Questions
Why do you need my VIN?
Why do you need my VIN?
We use your Vehicle Identification Number (VIN) to access the latest official GM software updates specific to your car’s factory options. This ensures the BCM we send you performs correctly and has the most recent bug fixes and performance improvements from the manufacturer.
Is this really a plug-and-play installation?
Why do you need my VIN?
We use your Vehicle Identification Number (VIN) to access the latest official GM software updates specific to your car’s factory options. This ensures the BCM we send you performs correctly and has the most recent bug fixes and performance improvements from the manufacturer.
What happens to my old BCM?
Why do you need my VIN?
We use your Vehicle Identification Number (VIN) to access the latest official GM software updates specific to your car’s factory options. This ensures the BCM we send you performs correctly and has the most recent bug fixes and performance improvements from the manufacturer.
Will this fix my ‘Service Theft System’ message?
Why do you need my VIN?
We use your Vehicle Identification Number (VIN) to access the latest official GM software updates specific to your car’s factory options. This ensures the BCM we send you performs correctly and has the most recent bug fixes and performance improvements from the manufacturer.
What if I have an airbag light on after installing?
Why do you need my VIN?
We use your Vehicle Identification Number (VIN) to access the latest official GM software updates specific to your car’s factory options. This ensures the BCM we send you performs correctly and has the most recent bug fixes and performance improvements from the manufacturer.