Tired of Unpredictable Electrical Problems in Your Cadillac?
As a technician with over two decades of hands-on diagnostic experience, I’ve seen it all. A customer comes in, completely frustrated. Their power windows have a mind of their own, the interior lights flicker randomly, or the car’s security system acts up for no reason. These aren’t just annoyances; they’re classic signs of a failing Body Control Module (BCM), the central nervous system for your vehicle’s comfort and convenience features. For your 2008-2013 CTS Body Control Module, a failure can turn your luxury ride into a source of daily headaches.
The BCM is responsible for managing a vast network of non-engine-related functions. When it starts to fail, you get bizarre, inconsistent issues that are often difficult to diagnose. You don’t have to live with the gremlins. This service provides a reliable, tested BCM that gets your vehicle’s electronics working in harmony again.
From the Diagnostic Bay: The Case of the Confused Cadillac
I remember a 2011 CTS that came into my shop. The owner was at his wit’s end. The radio would turn on and off, the driver’s side power lock wouldn’t respond, and the dash would occasionally light up with a ‘Service Theft System’ message. He’d been to two other shops that couldn’t pinpoint the issue. After connecting my scan tool, I saw multiple communication loss codes (U-codes) pointing to the BCM. Instead of a costly and complex replacement at the dealer, we used our cloning service. We transferred the data from his faulty module to our replacement unit. He had his car back the next day, fully functional, with no more electrical ghosts. That’s the power of a direct data transfer—it’s a precise and effective fix.
Common Signs Your BCM is Failing
If your vehicle is experiencing any of these issues, a faulty BCM is the likely culprit. This isn’t just a list; it’s a diagnostic checklist I’ve used in my bay hundreds of times.
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights (headlights, taillights) staying on or not turning on.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Intermittent issues with the radio, climate control, or instrument cluster gauges.
- ✔ False security system alarms or ‘Service Theft System’ messages.
- ✔ Diagnostic trouble codes (DTCs) related to communication errors, like U0140, U0155, or other U-codes.
The Smart Solution: Our VIN-Matched Cloning Service
Forget about expensive dealership programming, towing fees, and vehicle downtime. Our unique cloning service makes this a straightforward swap. Here’s how it works: You purchase this BCM and send us your vehicle’s original module. We then perform a professional data transfer, copying all the critical, vehicle-specific information to the replacement unit. This ensures the new module is a perfect digital match for your car, retaining all its original settings and key information. We then ship both your original module and the ready-to-install replacement back to you. This is the most efficient way to replace a 2008-2013 CTS Body Control Module.
Your Straightforward BCM Installation Guide
Installing your newly programmed BCM is a manageable task for a confident DIYer. For the 2008-2013 CTS, the BCM is typically located on the left (driver’s) side of the dash.
- Safety First: Always disconnect the negative terminal from your car’s battery and wait a few minutes before starting work on any electrical components.
- Locate the Module: On your CTS, access the BCM by removing the necessary trim panels under the driver’s side dashboard, near the steering column.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs, so be gentle. Once disconnected, unbolt or unclip the module from its mounting bracket.
- Install the New Module: Mount the replacement BCM in the same position and reconnect all the electrical connectors firmly. Ensure they click into place.
- Reconnect Power: Reattach the negative battery terminal.
- Test and Verify: Start the vehicle and test all the functions controlled by the BCM—windows, locks, lights, wipers, etc.—to confirm the repair was successful.
Important Post-Installation Note: In some cases, additional steps may be needed. If your airbag light is on, a professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure. Similarly, a ‘Brake Pedal Position Relearn’ might be necessary. Always refer to a service manual for your specific vehicle if you are unsure.
Verified Fitment for a Wide Range of GM Vehicles
This BCM, identified by part number 20815898 and its equivalents, is compatible with a broad array of GM cars, trucks, and SUVs. Please verify your vehicle and part number from the list below. This part is a direct replacement for the following 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.
EXPRESS 2500 VAN 10 Body Control (BCM); (center dash), 6.0L
EXPRESS 3500 VAN 08-09 Body Control (BCM); (center dash)
SAVANA 3500 VAN 10 Body Control (BCM); (center dash), 6.6L, VIN 6 (8th digit, opt LMM)
IMPALA 06-12 Body Control (BCM); (LH dash)
SAVANA 2500 VAN 10 Body Control (BCM); (center dash), 4.8L
ACADIA 07-12 Body Control (BCM); (LH dash)
MONTE CARLO 06-07 Body Control (BCM); (LH steering column)
TAHOE 10 Body Control (BCM); (under steering column), ID 25892622
TRAVERSE 09-12 Body Control (BCM); (LH dash)
EXPRESS 3500 VAN 10 Body Control (BCM); (center dash), 6.6L, VIN 6 (8th digit, opt LMM)
YUKON 10 Body Control (BCM); (under steering column), ID 25892622
SAVANA 2500 VAN 11-12 Body Control (BCM); (center dash)
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 20815898
CAPTIVA SPORT 12 Body Control (BCM); (center dash), ID 20921435
CAPTIVA SPORT 12 Body Control (BCM); (center dash), ID 22860591
DTS 06-11 Body Control (BCM); (RH center dash)
OUTLOOK 07-10 Body Control (BCM); (center dash)
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 25892622
ESCALADE EXT 10 Body Control (BCM); (under steering column), ID 25892622
SAVANA 1500 VAN 08-12 Body Control (BCM); (center dash)
EXPRESS 2500 VAN 11-12 Body Control (BCM)
EXPRESS 1500 VAN 08-12 Body Control (BCM); (center dash)
STS 10 Body Control (BCM); center dash
SAVANA 3500 VAN 08-09 Body Control (BCM); (center dash)
TORRENT 07-09 Body Control (BCM); (center dash)
SAVANA 2500 VAN 10 Body Control (BCM); (center dash), 6.0L
TAHOE 10 Body Control (BCM); (under steering column), ID 20815898
CTS 08-13 Body Control (BCM); LH dash
CAPTIVA SPORT 12 Body Control (BCM); (center dash), ID 20921436
EXPRESS 3500 VAN 10 Body Control (BCM); (center dash), 6.0L
G8 08-09 Body Control (BCM); (center dash)
IMPALA 13 Body Control (BCM); (LH dash), ID 22820315
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 20815898
AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 25892622
EXPRESS 2500 VAN 10 Body Control (BCM); (center dash), 4.8L
EXPRESS 2500 VAN 10 Body Control (BCM); (center dash), 6.6L, VIN 6 (8th digit, opt LMM)
YUKON 10 Body Control (BCM); (under steering column), ID 20815898
ESCALADE 10 Body Control (BCM); (under steering column), ID 25892622
LUCERNE 06-11 Body Control (BCM); (right side dash)
CTS 08 Body Control (BCM); RH dash
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 25892622
EXPRESS 3500 VAN 10 Body Control (BCM); (center dash), 4.8L
SAVANA 2500 VAN 08-09 Body Control (BCM); (center dash)
SAVANA 3500 VAN 10 Body Control (BCM); (center dash), 4.8L
SAVANA 3500 VAN 10 Body Control (BCM); (center dash), 6.0L
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 25892622
ESCALADE 10 Body Control (BCM); (under steering column), ID 20815898
SRX 07-09 Body Control (BCM); LH dash
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 20815898
EXPRESS 3500 VAN 11-12 Body Control (BCM)
HUMMER H2 08-09 Body Control (BCM); (LH firewall)
SAVANA 3500 VAN 11-12 Body Control (BCM)
VUE 08-10 Body Control (BCM); (center dash)
CAPRICE 11-13 Body Control (BCM)
ENCLAVE 08-12 Body Control (BCM); (LH dash)
EXPRESS 2500 VAN 08-09 Body Control (BCM); (center dash)
SAVANA 2500 VAN 10 Body Control (BCM); (center dash), 6.6L, VIN 6 (8th digit, opt LMM)
Frequently Asked Questions
Frequently Asked Questions
What exactly is a ‘cloning service’?
It’s a data transfer process. We copy the essential, vehicle-specific configuration data (like key information and options) from your original BCM to the replacement unit. This makes the new module plug-and-play, eliminating the need for expensive dealership programming.
So I don’t need to take my car to a dealer after installation?
Correct. In nearly all cases, our cloning service means the module is ready to go right out of the box. The only exceptions might be specific relearn procedures like for the airbag system or brake pedal sensor if a warning light appears, which can often be done by an independent shop.
What happens to my original BCM?
We always return your original module along with the programmed replacement unit. We need your original to perform the data transfer, but it is always sent back to you. We do not keep it.
Where is the BCM located on my 2008-2013 Cadillac CTS?
For this specific model and year range, the Body Control Module is typically found behind the lower dashboard panel on the driver’s side (LH dash), near the steering column.
What if my airbag light is on after I install the new BCM?
This can happen occasionally. It means the BCM and the airbag system (SDM) need to be re-synced. A qualified technician with a professional scan tool will need to perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve it.