Restore Full Electrical Function to Your Cadillac CTS
Are you dealing with baffling electrical issues in your 2008-2013 Cadillac CTS? Flickering lights, power windows with a mind of their own, or a security system that acts up randomly are 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 driving experience into a constant frustration. In my 20+ years of diagnostics, I’ve seen how a single failing module can mimic a dozen different problems, leading to wasted time and money on incorrect repairs.
This is the definitive, reliable solution. We offer a direct-replacement Body Control Module, part number 15921353, that solves these persistent issues. The best part? We eliminate the most significant hurdle of this repair: programming. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash this module with the latest GM software specific to your car. It arrives at your door ready for installation, saving you a costly trip to the dealership and their programming fees.
A Technician’s Notebook
A customer’s 2011 CTS came into the shop last month with a truly bizarre complaint. The driver’s side window would only work intermittently, the radio would sometimes not turn on, and the key fob range was practically nonexistent. They had already replaced the window motor and the key fob battery with no success. After hooking up the scan tool, I saw a slew of communication error codes pointing toward the BCM. Instead of a complex wiring chase, we installed a VIN-programmed module just like this one. The total time for diagnosis and repair was under an hour, and every single one of the customer’s complaints was resolved. It’s a perfect example of how this single component can restore sanity to a vehicle’s complex electrical system.
Is Your Cadillac Showing These Electrical Gremlins?
A failing BCM doesn’t always trigger a check engine light, making it tricky to diagnose. Here are common symptoms I’ve seen in the shop:
- ✔ Erratic or non-functional power windows, door locks, and interior/exterior lights.
- ✔ The security system or anti-theft light staying on or preventing the car from starting.
- ✔ Dashboard gauges behaving erratically or not working at all.
- ✔ Key fobs that work intermittently or not at all.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Communication error codes (U-codes) stored when checked with a professional scan tool.
Your Straightforward BCM Installation Guide
Installing your new 2008-2013 CTS Body Control Module is a manageable job for a confident DIYer. For the CTS, the BCM is typically located on the left (driver’s) side of the dash. Always consult a service manual for the exact location on your specific vehicle.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- Access the Module: You will likely need to remove the lower dash panel or kick panel on the driver’s side 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 old module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely reconnect all electrical connectors. Ensure they click into place.
- Post-Installation Procedures (CRITICAL): Reconnect the battery. You MUST now perform the ‘Setup SDM Primary Key in BCM’ procedure with a compatible high-end scan tool to clear the airbag light. Some vehicles may also require a Brake Pedal Position Sensor recalibration. Failure to perform these steps can leave warning lights on and compromise safety systems.
Verified Fitment Across a Wide Range of GM Vehicles
While this is a perfect fit for the 2008-2013 CTS, this versatile module is also compatible with a vast array of other GM cars, trucks, and vans. Please cross-reference your original part number to ensure compatibility. This module replaces the following 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.
AVALANCHE 1500 10
CAPRICE 11-13
CAPTIVA SPORT 12
CTS 08-13
DTS 06-11
ENCLAVE 08-12
EQUINOX 07-09
ESCALADE 10
ESCALADE ESV 10
ESCALADE EXT 10
EXPRESS 1500 VAN 08-12
EXPRESS 2500 VAN 08-12
EXPRESS 3500 VAN 08-12
G8 08-09
HUMMER H2 08-09
IMPALA 06-13
LUCERNE 06-11
MONTE CARLO 06-07
OUTLOOK 07-10
SAVANA 1500 VAN 08-12
SAVANA 2500 VAN 08-12
SAVANA 3500 VAN 08-12
SRX 07-09
STS 10
SUBURBAN 1500 10
TAHOE 10
TORRENT 07-09
TRAVERSE 09-12
VUE 08-10
YUKON 10
YUKON XL 1500 10
Frequently Asked Questions
Do I really need to provide my VIN?
Yes, absolutely. Providing your VIN is essential. We use it to program the module with the correct software and vehicle-specific options for your Cadillac, ensuring it works correctly right out of the box.
Is this a difficult part to replace myself?
For someone with moderate mechanical skill, it’s a very manageable job. The main challenge is typically accessing the module’s location under the dash. The physical swap is just a few bolts and connectors.
What happens if I don’t do the airbag (SDM) key setup?
If you skip this step, the airbag warning light will remain illuminated on your dashboard, and more importantly, the supplemental restraint system may not function correctly in an accident. This procedure is critical for safety.
Will this fix my specific problem?
This BCM is the solution for a wide range of body electrical faults. If you’re experiencing issues with components controlled by the BCM (lights, locks, windows, security), there is a very high probability this will resolve them, provided the components themselves are not faulty.
What tools are required for the post-installation procedures?
The SDM key setup and brake pedal recalibration require a professional-grade bidirectional scan tool, such as a GM Tech 2, MDI, or a high-end aftermarket scanner with GM-specific software. A basic code reader will not work.