Restore Full Functionality to Your Cadillac
Is your 2008-2013 Cadillac CTS experiencing a host of bizarre electrical problems? From power windows that have a mind of their own to a security system that won’t disarm, a failing Body Control Module (BCM) is often the culprit. As the central nervous system for your vehicle’s electronics, the BCM’s health is critical. This isn’t just an inconvenience; it can affect vehicle security and drivability. We offer a reliable, direct-fit solution with this pre-programmed BCM, designed to get your CTS back to perfect working order without the exorbitant dealership price tag.
A Technician’s Notebook: The Ghost in the Cadillac
I remember a 2011 CTS that came into my bay with a laundry list of complaints the owner called ‘electronic ghosts.’ The dome lights would flicker, the radio would randomly shut off, and the key fob worked intermittently. The owner had already replaced the battery and checked all the fuses. After connecting my scan tool, I found a slew of U-codes (communication errors) pointing to a network breakdown. The common link? The BCM. Water intrusion from a leaky cowl seal had corroded a section of the module’s board. Replacing it with a pre-programmed unit like this one solved every single issue in one go. It’s a classic failure I’ve seen dozens of times on these platforms.
Common Signs of a Failing BCM
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The security system light flashing, preventing the car from starting (anti-theft active).
- ✔ Key fobs that suddenly stop working or have a very limited range.
- ✔ A dashboard lit up with multiple, unrelated warning lights.
- ✔ Diagnostic trouble codes (DTCs) related to communication loss, such as U0140, U0155, or other U-codes.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the BCM: On the 2008-2013 Cadillac CTS, the Body Control Module is typically located on the left-hand (driver’s) side of the dashboard, often behind the lower dash panel.
- ✔ Remove Connectors: Carefully unplug all electrical connectors from the old BCM. They have locking tabs that need to be depressed to release.
- ✔ Swap the Module: Unbolt or unclip the old module from its mounting bracket and remove it. Install the new, pre-programmed BCM in its place.
- ✔ Reconnect Everything: Plug all electrical connectors firmly into the new module and reconnect the negative battery terminal.
- ✔ Perform Relearns: Start the vehicle. Note that some post-installation procedures, like an airbag system sync or brake pedal position relearn, may be necessary. See the details below.
Post-Installation Requirements
While this BCM is programmed to your VIN for a streamlined installation, certain vehicle systems may need to be re-synchronized after the new module is in place.
- Airbag System Sync: If the airbag warning light is illuminated after installation, a professional scan tool is required to perform the “Setup SDM Primary Key in BCM” procedure. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: To ensure proper brake light and traction control operation, a brake pedal position sensor recalibration might be needed. This can often be done with a high-end diagnostic tool.
Disclaimer: Specific procedures can vary by vehicle. Always consult a factory service manual or a qualified technician for guidance.
Verified Vehicle Compatibility
This BCM is a direct replacement for part number 20935349 and is compatible with a wide range of GM vehicles. It also interchanges with the following part numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921435, 20921436, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084. Please verify your vehicle from the list below.
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
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you will need to provide us with your vehicle’s 17-digit VIN. We use this to load the latest GM-certified software specific to your vehicle’s options and configuration onto the BCM before shipping it to you.
Is this a simple plug-and-play installation?
For most vehicles, it is. The module is programmed to your VIN to minimize post-installation work. However, as noted, some vehicles may require an additional relearn procedure for the airbag or brake systems, which requires a professional scan tool.
Do I need to send my old BCM back?
No. There is absolutely no core charge for this part. You can keep your old module, which can be helpful for comparison or as a backup if needed.
Will this fix my car’s no-start problem?
If the no-start is caused by the BCM activating the anti-theft system, then yes, replacing it should resolve the issue. However, a no-start can have many causes, so proper diagnosis is always recommended.
What tools are needed for the installation?
Basic hand tools like a socket set and screwdrivers are usually all that’s needed to access and swap the module itself. A professional-grade scan tool may be required for any post-installation relearn procedures.