Restore Your Van’s Electrical System and Get Back on the Road
Is your work van or family SUV suddenly acting possessed? Flickering lights, intermittent starting problems, power windows with a mind of their own, or a security light that won’t turn off 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 cause a cascade of frustrating and hard-to-diagnose electrical issues. This isn’t just an annoyance; for a work vehicle like a 2008-2012 Savana 2500 Van, downtime means lost income.
This is a direct-fit replacement Body Control Module, part number 20921435, that solves these problems. The best part? We handle the programming for you. Forget about towing your vehicle to a dealership and paying hundreds for programming and calibration. Simply provide your vehicle’s VIN at checkout, and our experts will flash this module with the latest GM software specific to your vehicle. It arrives at your door ready for a straightforward installation, saving you time, money, and headaches.
Case Study: A Tricky Diagnosis
I remember a 2011 Express 2500 that came into my shop. The owner was at his wit’s end. He’d replaced the battery and alternator, but the van would still intermittently refuse to start, and the radio and interior lights would flicker randomly. No check engine light, just bizarre electrical gremlins. After hooking up my pro-level scan tool, I saw a dozen communication loss codes (U-codes) with various modules. This pointed directly to the network’s hub: the BCM. The internal circuitry was failing, corrupting data on the CAN bus. We installed a VIN-programmed BCM just like this one, and it was like flipping a switch. All the phantom issues vanished. It’s a fix I’ve performed hundreds of times on these GM platforms.
Common Signs of a Failing GM BCM
If your vehicle is exhibiting any of these symptoms, a failing BCM is the likely culprit. A failing module can also trigger various Diagnostic Trouble Codes (DTCs), most commonly communication codes like U0140, U0155, or specific body codes (B-codes).
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Erratic or dead instrument cluster gauges.
- ✔ Interior or exterior lights flickering, staying on, or not working at all.
- ✔ The security system light stays on, preventing the vehicle from starting (Passlock issues).
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ A/C and heater controls not responding correctly.
- ✔ Communication errors with other vehicle modules.
A Straightforward Guide to BCM Installation
Replacing the BCM in most of these GM vehicles is a manageable job for a DIYer with basic tools. While the location varies slightly (see fitment list), the process is similar. For a 2008-2012 Savana BCM, it’s typically located in the center dash area.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: Access the module. In Savana/Express vans, this often involves removing a few dash trim panels near the center console or driver’s footwell.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the old BCM and remove it from the vehicle.
- 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 (without starting) and test functions like lights, locks, and windows. Start the vehicle and check for any warning lights.
- Post-Installation Steps: In some cases, an airbag light may appear or brake functions may need recalibration. Please refer to our FAQ and the provided information on post-install procedures.
Verified Vehicle Compatibility List
This BCM is a direct replacement for a wide range of GM vehicles and interchanges with multiple part numbers. Please verify your vehicle is on this list. The part number on your original module should match one of the numbers below.
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
- ACADIA 07-12 Body Control (BCM); (LH dash)
- 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 / ESV / EXT 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
- EXPRESS 1500/2500/3500 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 1500/2500/3500 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 / YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 20815898 or 25892622
Frequently Asked Questions
Frequently Asked Questions
Why do you need my VIN?
Your VIN (Vehicle Identification Number) allows us to program the BCM with the exact software and vehicle-specific options from GM. This ensures all features work correctly and makes the module ready for installation right out of the box, eliminating the need for an expensive trip to the dealer.
Is there a core charge for my old BCM?
No, there is absolutely no core charge. You can keep your old module, so you don’t have to worry about the cost or hassle of shipping it back.
What tools do I need to install this?
For most applications, including the Savana van, you’ll only need basic hand tools like a socket set, screwdrivers, and possibly some trim removal tools to avoid scratching your dashboard panels. No special electronic equipment is required.
What if the airbag light (SRS light) comes on after installation?
This can occasionally happen. It means the new BCM needs to be electronically introduced to the airbag’s computer (SDM). A professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure. This is a quick process for any competent repair shop.
Do I need to do a brake pedal position relearn?
On some models, a brake pedal position sensor recalibration may be needed to ensure your brake lights and traction control system function properly. This is another simple procedure that can be done with a bi-directional scan tool if required for your specific vehicle.