Restore Your Cadillac’s Electrical System with a VIN-Matched BCM
Is your 2010 Cadillac STS or another GM vehicle acting possessed? Flickering lights, unresponsive power windows, a security system that randomly engages, or a dashboard lit up with warning lights are all classic signs of a failing Body Control Module (BCM). As the central nervous system for your vehicle’s comfort and convenience features, a faulty BCM can turn your daily drive into a frustrating ordeal. In my 20+ years of experience, I’ve seen how a failing BCM can mimic dozens of other problems, leading to wasted time and money on incorrect diagnoses. This isn’t just a component; it’s the brain behind your car’s body electronics.
This is your direct-fit, reliable solution. We offer a high-quality replacement Body Control Module, part number 20921435, that arrives at your door ready for installation. The critical difference? Our expert technicians perform a Cloning Service before shipping. We use your vehicle’s VIN to flash the module with the latest GM-certified software, ensuring it communicates perfectly with your car’s existing systems right out of the box. This process eliminates the need for an expensive trip to the dealership for programming, saving you time and hundreds of dollars in labor costs.
A Technician’s Notebook: The Case of the Erratic Equinox
A customer brought in a 2008 Chevy Equinox with a laundry list of bizarre electrical issues. The interior lights would stay on, the radio would shut off intermittently, and the power locks were completely unresponsive. They had already replaced the battery and checked all the fuses. A scan tool showed multiple ‘U’ codes, specifically a U0140 (Lost Communication With Body Control Module). After confirming power and ground at the BCM connector, it was clear the module itself had failed internally. Instead of a costly new unit from the dealer plus programming fees, we ordered a VIN-programmed module like this one. The installation took less than an hour, and because it was pre-configured, all systems immediately returned to normal. It’s a prime example of how the right part, properly prepared, makes for an efficient and lasting repair.
Is Your Vehicle Showing These Symptoms?
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, mirrors, or door locks working intermittently or not at all.
- ✔ The security system or keyless entry failing to operate correctly.
- ✔ The radio or infotainment system randomly shutting off.
- ✔ Multiple warning lights on the dash with no obvious cause.
- ✔ Diagnostic Trouble Codes (DTCs) related to communication errors, such as U0140, U0155, or B1001.
Your Straightforward BCM Installation Guide
Installing your new BCM is a manageable task for a confident DIYer or a quick job for any professional mechanic. The exact location varies by model (see fitment list), but the general process is similar.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- Locate the BCM: On the 2010 Cadillac STS, the BCM is typically located in the center dash area. For other models, it may be under the steering column or on the left-hand side of the dash. A quick search for your specific model will confirm its location.
- Remove Trim Panels: Carefully remove any plastic trim or panels necessary to access the module. Use a non-marring pry tool to avoid scratching your interior.
- Disconnect and Remove: 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 Module: Mount your new, pre-programmed BCM in the same location. Reconnect all electrical connectors, ensuring they click securely into place.
- Post-Installation Steps: Reinstall any trim panels you removed. Reconnect the negative battery terminal. Start the vehicle and test all functions (windows, locks, lights, etc.).
- Perform Relearn Procedures (If Needed): As noted below, some vehicles may require an Airbag System Sync or a Brake Pedal Position Relearn if specific warning lights appear. This is typically done with a professional-grade scan tool.
Verified Fitment for Your GM Vehicle
This Body Control Module is a direct replacement for a wide range of General Motors vehicles. Please verify your part number and model from the list 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, and 95151084.
AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 25892622
CAPRICE 11-13 Body Control (BCM)
CAPTIVA SPORT 12 Body Control (BCM); (center dash), ID 20921435, 20921436, or 22860591
CTS 08-13 Body Control (BCM); LH dash
DTS 06-11 Body Control (BCM); (RH center dash)
ENCLAVE 08-12 Body Control (BCM); (LH dash)
EQUINOX 07-09 Body Control (BCM); (center dash)
ESCALADE 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
ESCALADE EXT 10 Body Control (BCM); (under steering column), ID 25892622
EXPRESS 1500 VAN 08-12 Body Control (BCM); (center dash)
EXPRESS 2500 VAN 08-12 Body Control (BCM)
EXPRESS 3500 VAN 08-12 Body Control (BCM)
G8 08-09 Body Control (BCM); (center dash)
HUMMER H2 08-09 Body Control (BCM); (LH firewall)
IMPALA 06-13 Body Control (BCM); (LH dash)
LUCERNE 06-11 Body Control (BCM); (right side dash)
MONTE CARLO 06-07 Body Control (BCM); (LH steering column)
OUTLOOK 07-10 Body Control (BCM); (center dash)
SAVANA 1500 VAN 08-12 Body Control (BCM); (center dash)
SAVANA 2500 VAN 08-12 Body Control (BCM)
SAVANA 3500 VAN 08-12 Body Control (BCM)
SRX 07-09 Body Control (BCM); LH dash
STS 10 Body Control (BCM); center dash
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
TAHOE 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
TORRENT 07-09 Body Control (BCM); (center dash)
TRAVERSE 09-12 Body Control (BCM); (LH dash)
VUE 08-10 Body Control (BCM); (center dash)
YUKON 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
Frequently Asked Questions
Frequently Asked Questions
What exactly does the Cloning Service involve?
Our Cloning Service means we transfer the essential software and vehicle-specific data from your original BCM to this replacement unit. This ensures it’s a perfect match for your car’s VIN and options, allowing for a simple plug-and-play installation without needing a dealership visit for programming.
Do I need to send my original BCM to you?
Yes, for the cloning service to be performed, you will need to send us your original module. We will clone the necessary data to the replacement unit and then ship both your original module and the newly programmed replacement back to you together.
What if my airbag light comes on after installation?
This can happen occasionally. It means the new BCM needs to be synchronized with the airbag system’s Supplemental Deployment Module (SDM). A professional mechanic can perform the ‘Setup SDM Primary Key in BCM’ procedure with a diagnostic tool to resolve this.
Is this a guaranteed fix for my car’s electrical problems?
If your vehicle’s symptoms match those of a failed BCM and the module has been properly diagnosed as the source of the issue, this part is the correct solution. We always recommend a thorough diagnosis by a qualified technician to confirm the BCM is the root cause before ordering.
What is your core policy?
We make it simple. We always return your original module along with the programmed replacement unit. We do not keep your old part, as it’s required for the data transfer and belongs to you.