Restore Your Cadillac’s Electrical System with a True Plug-and-Play Solution
Are you chasing electrical gremlins in your 2010 Cadillac STS? Intermittent power windows, flickering dash lights, a security system that has a mind of its own, or even a no-start condition can all point to one culprit: a failing Body Control Module (BCM). As the central nervous system for your vehicle’s comfort and convenience features, a faulty BCM can make driving a daily frustration. In my 20+ years of diagnostics, I’ve seen how a bad BCM can mimic a dozen other problems, leading owners down a costly path of replacing perfectly good parts.
This isn’t just another part; it’s a complete, ready-to-install solution. We take the guesswork and the expensive trip to the dealership out of the equation. Simply provide us with your vehicle’s VIN during checkout, and our certified technicians will program this BCM with the latest, most stable software directly from GM. It arrives at your door ready to be installed, saving you time, money, and the headache of coordinating a programming appointment. This is the definitive fix for restoring the precise electronic functions your luxury vehicle was designed to have.
From the Technician’s Bench
A customer’s 2010 Cadillac STS came in last month with these exact symptoms. The remote keyless entry worked only sometimes, the driver’s side window wouldn’t go down, and the anti-theft light would stay on, occasionally preventing the car from starting. The owner had already replaced the window motor and a battery with no success. After hooking up the scan tool, I saw multiple communication codes pointing toward the BCM. Instead of a complicated dealer visit, we installed one of our pre-programmed modules. In under an hour, every single issue was resolved. The key is getting a module that’s correctly flashed to the VIN before installation—it makes all the difference between a quick fix and a week-long headache.
Common Signs of a Failing Cadillac BCM
If your vehicle is exhibiting these behaviors, a failing BCM is the likely cause. Replacing your 2010 STS Body Control Module can resolve these issues:
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior dome lights or exterior lights staying on or not turning on at all.
- ✔ The security system alarm sounding randomly or the vehicle refusing to start.
- ✔ Inconsistent or malfunctioning dashboard warning lights (including the airbag light).
- ✔ Key fob not being recognized by the vehicle.
- ✔ Communication errors with other modules when read by a diagnostic scan tool.
Your Straightforward BCM Installation Guide
For the confident DIYer, installing this BCM is a manageable job. The BCM on the 2010 STS is typically located in the center dash area.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes to allow all systems to power down completely.
- Access the Module: Carefully remove the necessary dash trim panels to gain access to the BCM. This may involve removing panels around the center console or glove box area. Keep your screws organized.
- Disconnect and Remove: Unplug the electrical connectors from the old BCM. They have locking tabs that need to be pressed to release. Once disconnected, unbolt the module from its mounting bracket and remove it.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely fasten it. Reconnect all electrical connectors, ensuring they click firmly into place.
- Post-Installation Procedures: Reconnect the battery terminal. While our programming handles the core functions, some vehicles require these final steps:
- Airbag System Reset: To clear the airbag warning light, a ‘Setup SDM Primary Key in BCM’ procedure must be performed with a compatible high-end scan tool. This re-establishes communication between the new BCM and the airbag system.
- Brake Pedal Position Sensor Relearn: Some models may require a brake pedal position sensor calibration to ensure proper brake light operation and stability control function. This is also done with a professional diagnostic tool.
- Test All Functions: Start the vehicle and test all related functions: windows, locks, lights, wipers, and key fob operation to confirm a successful installation.
Verified Vehicle Compatibility List
This BCM, part number 20839063, is a direct replacement for a wide range of GM vehicles. Please verify your vehicle is on this list and that the part number on your original module is listed below. This module replaces 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
Note: Some models have specific options or ID requirements. Please check the original description for details or contact us with your VIN to confirm fitment.
Frequently Asked Questions
Do I really need to provide my VIN?
Yes, providing your VIN is essential. We use it to program the 2010 STS Body Control Module with the correct software and vehicle-specific options, ensuring it works seamlessly with your car right out of the box.
What happens if I install it without doing the airbag or brake relearn procedures?
The vehicle will likely run, but you will have a persistent airbag warning light on your dash, and the airbag system will be inactive. The brake lights or stability control may also function incorrectly, which are significant safety concerns. These procedures are highly recommended.
Is this a difficult part to replace myself?
For someone with moderate mechanical skill and the right tools (basic hand tools, trim removal tools), it’s a very doable job. The most challenging part is often accessing the module behind the dash panels. The key is patience. However, the post-installation electronic resets require a professional-grade scan tool.
Will this fix my ‘Service Theft System’ message?
In many cases, yes. The BCM is integral to the Pass-Key/Passlock anti-theft system. A failing BCM is a very common cause of security system warnings and no-start conditions related to theft deterrence.
What if my original part number is not on your list?
If your part number is not listed, please contact us with your VIN. GM often supersedes part numbers, and we can verify if this module is the correct, updated replacement for your specific vehicle.