Restore Your Cadillac’s Core Functions
Is your 2008-2013 Cadillac CTS acting possessed? Flickering lights, malfunctioning power windows, a security system that won’t cooperate, or even a frustrating no-start condition can often be traced back to one component: a failing Body Control Module (BCM). As the central command center for your vehicle’s electronics, when the BCM falters, it can create a cascade of confusing and disruptive problems. This isn’t just an inconvenience; it affects your car’s reliability and your peace of mind. As a technician with over 20 years of experience, I’ve seen how a faulty BCM can turn a luxury vehicle into a source of daily frustration.
We offer a straightforward and reliable solution. This is a replacement BCM that comes ready for installation through our expert Cloning Service. You send us your original BCM, and we transfer its exact data—including key information and vehicle-specific settings—to this replacement unit. The result? A true plug-and-play module that eliminates the need for expensive dealership programming. We then ship both your original module and the ready-to-install replacement back to you.
A Technician’s Notebook: The Ghost in the Machine
A customer brought in a 2011 CTS with a laundry list of bizarre symptoms. The radio would turn on by itself, the driver’s side window worked intermittently, and the key fob would randomly stop working. They had already replaced the battery and checked fuses with no luck. After connecting my diagnostic scanner, I saw multiple ‘U’ codes, specifically U0140 (Lost Communication With Body Control Module). This pointed me directly to the BCM. Instead of a simple failure, the internal circuits were degrading, causing erratic signals across the vehicle’s network. By providing a cloned BCM, we were able to resolve all the issues in one go, saving the customer from a costly and lengthy diagnostic process at the dealership. This is a classic failure pattern for the 2008-2013 CTS Body Control Module.
Common Signs of a Failing BCM
If you’re experiencing any of the following, a faulty BCM could be the culprit. A proper diagnosis is key, but these are tell-tale signs I’ve seen hundreds of times in the shop:
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, door locks, or security system acting strangely.
- ✔ The engine won’t crank or start, even with a good battery.
- ✔ Warning lights appearing on the dashboard for no apparent reason.
- ✔ Key fobs are not being recognized by the vehicle.
- ✔ Communication error codes stored, such as U0140, B1001, or other B-series codes.
Your Straightforward BCM Swap Guide
For the DIY enthusiast, replacing the BCM on a 2008-2013 CTS is a manageable job. The BCM is typically located on the left (driver’s) side of the dash. Always exercise caution when working with vehicle electronics.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Access the Module: You will likely need to remove the lower dash panel beneath the steering column. This is usually held in by a few clips and screws.
- Locate the BCM: Identify the Body Control Module. It’s a plastic box with several large electrical connectors plugged into it.
- Disconnect and Remove: Carefully unplug all electrical connectors. They have locking tabs that must be depressed. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Seat the replacement BCM into the mounting bracket and secure it. Reconnect all electrical connectors firmly until they click into place.
- Reassemble and Reconnect: Reinstall the dash panel and reconnect the negative battery terminal.
- Perform Post-Install Checks: Start the vehicle and test all body functions—windows, locks, lights, etc. Refer to the post-installation procedures below if any warning lights appear.
Important Post-Installation Steps
Our cloning service makes this repair as simple as possible, but some vehicle systems may require a quick handshake with the new module:
- Airbag System Sync: If your airbag warning light is on 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. This can also be performed with a capable scan tool.
Disclaimer: Vehicle systems vary. We always recommend consulting a factory service manual or a qualified technician if you are unsure about any step.
Guaranteed Vehicle Compatibility
This module is a direct replacement for a wide range of GM vehicles. Please verify your part number and vehicle model from the list below to ensure perfect fitment.
This BCM is compatible with part numbers: 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.
Fits the following models (and more):
- Cadillac CTS (2008-2013)
- Cadillac DTS (2006-2011)
- Cadillac Escalade, ESV, EXT (2010)
- Chevrolet Impala (2006-2013)
- Chevrolet Tahoe / Suburban 1500 (2010)
- Chevrolet Avalanche 1500 (2010)
- Chevrolet Express / GMC Savana Vans (2008-2012)
- GMC Acadia / Saturn Outlook (2007-2012)
- Buick Enclave / Chevrolet Traverse (2008-2012)
- And many others listed in the compatibility chart.
Frequently Asked Questions
What is a ‘Cloning Service’ and why do I need it?
Cloning is the process of transferring the unique software and security data from your original BCM to the replacement unit. This makes the replacement module plug-and-play, as it contains all your vehicle’s specific information, avoiding the need for a trip to the dealer for expensive programming.
Do I need to send my original BCM to you?
Yes. For the cloning service to work, we need your original module to extract the data. We will return your original module along with the newly programmed replacement.
Will this fix my car’s no-start problem?
If the no-start condition is caused by a faulty BCM (for example, if it’s not recognizing your key or activating the starter relay), then this will resolve the issue. However, no-start problems can have many causes, so a proper diagnosis is always recommended.
Is this a difficult part for a DIYer to replace?
For most of the compatible vehicles, like the 2008-2013 CTS, the BCM is accessible under the driver’s side dash. With basic hand tools and by following our guide, it is a manageable job for someone with moderate mechanical experience.
Why is my airbag light on after installing the new BCM?
The BCM and the airbag module (SDM) are linked for security. If the light is on, the modules simply need to be re-synced. This is done with a ‘Setup SDM Primary Key in BCM’ procedure using a professional scan tool, as mentioned in our post-installation notes.