Restore Your Van’s Electrical System with a Plug-and-Play Solution
If your 2008-2012 GMC Savana 3500 is plagued by bizarre electrical issues, a failing Body Control Module (BCM) is often the culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty BCM can turn a reliable work van into a source of constant frustration. This isn’t just an inconvenience; it can affect critical systems. That’s why we offer a straightforward, reliable solution: a replacement BCM with a complete cloning service, pre-programmed to your vehicle’s specific VIN.
Forget expensive dealership visits and the hassle of coordinating programming. We handle the technical work for you. Simply provide your VIN after purchase, and we will flash this module with the latest GM software and transfer the essential data from your original unit. This ensures seamless integration with your van’s existing systems, making the repair process as simple as possible. This is the definitive fix for your 2008-2012 Savana 3500 BCM problems.
A Technician’s Notebook: The Case of the Haunted Work Van
A contractor brought in his Savana 3500 complaining of ‘ghosts in the machine.’ The dome lights would flicker, the power locks would cycle randomly while driving, and sometimes the security light would stay on, preventing it from starting. He’d replaced the battery and checked fuses, but the problems persisted. After connecting my scan tool, I saw multiple U-codes (communication errors) pointing to the BCM. Instead of a costly new module and a full system relearn at the dealer, we used a cloned BCM. The swap took less than an hour, and all the strange electrical issues vanished instantly. It’s a classic BCM failure, and this service is the most efficient fix I’ve found.
Is Your Vehicle Showing These Symptoms?
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not working correctly.
- ✔ The security system light is illuminated, causing a no-start condition.
- ✔ The instrument cluster displays strange warnings or gauges behave abnormally.
- ✔ The radio or climate control systems are malfunctioning.
- ✔ Diagnostic trouble codes (DTCs) related to communication errors (U-codes) are present.
- ✔ Inconsistent operation of the remote keyless entry system.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the BCM: In most Savana and Express vans, the BCM is located behind the center dash panel. You may need to remove trim pieces to gain access.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that must be depressed. Once disconnected, remove the bolts or clips holding the module in place.
- ✔ Install the New Module: Mount your new, pre-programmed BCM in the same location and securely reconnect all the electrical harnesses. Ensure they click into place.
- ✔ Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘ON’ position and test all body functions—lights, locks, windows, etc.—to confirm the repair.
Important Post-Installation Steps
Our cloning service minimizes post-installation requirements, but depending on your vehicle’s specific configuration, some minor procedures may be needed:
- Airbag System Sync: If the airbag warning light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the safety systems.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure correct brake light and traction control operation.
Disclaimer: Vehicle systems vary. Always refer to a factory service manual or consult with a qualified mechanic if you are unsure about any step.
Verified Vehicle Compatibility
This BCM, part number 20839063, is a direct replacement for a wide range of GM vehicles and interchanges with numerous part numbers. While this is a 2008-2012 Savana 3500 BCM, please verify your vehicle in the list below. This module replaces the following part numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20864767, 20864768, 20921435, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084.
Frequently Asked Questions
How does the cloning service work?
After you place your order, you will send us your original BCM. We then use specialized equipment to extract the critical vehicle-specific data (like VIN, mileage, and key information) and transfer it to the replacement module. This ensures the new module is a perfect digital match for your vehicle.
Do I need to get this programmed at the dealership?
No. The main benefit of our service is that the module arrives at your door already programmed and ready for installation. This saves you from the time, cost, and hassle of a dealer visit.
What do you do with my old BCM?
Your original module is required for the cloning process and is always returned to you along with the newly programmed replacement unit. We do not keep your core.
Is this a difficult part for a DIYer to replace?
For someone with basic mechanical skills, this is a very manageable job. The BCM is typically accessible behind the dash and involves unplugging connectors and removing a few bolts. Our pre-programming service eliminates the most difficult part of the job.
What if my airbag light comes on after I install it?
In some cases, the new BCM needs to be electronically introduced to the airbag system (SDM). This is a simple procedure called ‘Setup SDM Primary Key in BCM’ that can be done with a bi-directional scan tool, often available at local independent repair shops.