Restore Full Electrical Control to Your Cadillac CTS
Are you dealing with baffling electrical problems in your 2008-2013 Cadillac CTS? Intermittent power windows, flickering dash lights, or a security system that has a mind of its own are all classic signs of a failing Body Control Module (BCM). As the central command center for your vehicle’s body electronics, a faulty BCM can turn your luxury sedan into a source of daily frustration. This is the reliable, straightforward solution you’ve been searching for. We provide a high-quality BCM, programmed with the latest GM software specifically for your vehicle’s VIN, making the repair process as simple as possible.
From the Diagnostic Bay: The Case of the Haunted CTS
I remember a 2011 CTS that came into my shop with a list of complaints that seemed completely unrelated. The driver’s side window wouldn’t go down, the radio would randomly shut off, and the key fob only worked when it wanted to. The customer had already replaced the window switch and checked fuses. After connecting my scan tool, I saw a dozen communication codes (U-codes) pointing to a network failure. The common link? The BCM. Instead of a costly and time-consuming diagnostic chase, we pinpointed the central failure. Replacing the faulty module with a pre-programmed unit like this one resolved every single issue in one go, saving the customer hundreds in diagnostic labor and getting their car back to them the same day.
Common Symptoms of a Failing BCM
If your vehicle is exhibiting any of these behaviors, a failing BCM is the most likely culprit. In my 20+ years of experience, these are the tell-tale signs I see most often, frequently associated with communication codes like U0140.
- ✔ Erratic or non-functional power windows, door locks, or interior/exterior lighting.
- ✔ The security system or anti-theft light is activated, preventing the car from starting.
- ✔ Dashboard warning lights (like ABS or Airbag) illuminate for no reason.
- ✔ The horn, wipers, or radio operate intermittently or not at all.
- ✔ Keyless entry and remote start features stop working reliably.
- ✔ A scan tool cannot communicate with the Body Control Module.
A Straightforward Guide to Installation
Installing your new 2008-2013 CTS BCM is a manageable job for a confident DIYer or any professional technician. The BCM on the CTS is typically located on the left (driver’s) side of the dashboard.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system capacitors to discharge before starting any electrical work.
- Access the Module: You will likely need to remove the lower dash panel or knee bolster beneath the steering column to gain access to the BCM.
- Disconnect and Remove: Carefully 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.
- Install the New BCM: Mount the new module in the same location and securely reconnect all electrical harnesses. Ensure each connector clicks into place.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Post-Install Checks: Start the vehicle and test all body functions—windows, locks, lights, wipers, etc. Note that some additional steps may be required, as outlined below.
Important Notes After Installation
Our pre-programming service handles the most critical part of the job, but depending on your vehicle’s specific configuration, a couple of quick relearn procedures might be necessary:
- Airbag System Sync: If the airbag light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ function. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor recalibration to ensure proper brake light and traction control operation.
Disclaimer: Always consult a factory service manual for procedures specific to your vehicle’s year and model.
Verified Vehicle Compatibility
This BCM is a direct-fit replacement for a wide range of General Motors vehicles. It is compatible with part number 15299986 and interchanges with the following part numbers: 10382479, 15093910, 15276271, 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, and 95151084.
This part fits many models including, but not limited to:
- ✔ Cadillac CTS (2008-2013)
- ✔ Cadillac DTS (2006-2011)
- ✔ Cadillac Escalade, ESV, EXT (2010)
- ✔ Chevrolet Impala (2006-2013)
- ✔ Chevrolet Tahoe & Suburban 1500 (2010)
- ✔ GMC Acadia (2007-2012)
- ✔ GMC Yukon & Yukon XL 1500 (2010)
- ✔ Chevrolet Express & GMC Savana Vans (2008-2012)
- ✔ And many more. Please verify your part number.
Frequently Asked Questions
What does a Body Control Module do?
The BCM is a computer that manages and controls your vehicle’s non-engine-related electronic features. This includes power windows, door locks, interior and exterior lighting, security systems, wipers, and more. When it fails, these systems can become erratic.
Is programming really included in the price?
Yes! We program the module to your car’s specific VIN before shipping it to you. This critical step ensures the module communicates correctly with your vehicle’s other systems and saves you a costly trip to the dealership for programming.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information to perform the programming service.
My old BCM has a different part number. Will this work?
It might. We’ve included an extensive list of interchangeable part numbers this module replaces. Please check the list carefully to ensure your original part number is included for guaranteed compatibility.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module, which saves you the time and expense of return shipping.