Restore Full Functionality to Your GM Vehicle
If you’re dealing with bizarre electrical problems in your 2008-2012 Express 3500 Van—like power windows with a mind of their own, intermittent starting issues, or a security light that won’t turn off—you’re likely facing a failing Body Control Module (BCM). As the central nervous system for your vehicle’s body electronics, a faulty BCM can turn a reliable workhorse into a source of constant frustration. I’ve seen it hundreds of times in my 20+ years on the shop floor: a simple component causing a cascade of confusing and expensive-to-diagnose issues.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and dealership hassle out of the equation. Simply provide your vehicle’s VIN at checkout, and we will program this BCM with the latest GM-certified software specific to your Express Van. This ensures all factory-intended functions work correctly right out of the box, restoring the performance and reliability you depend on.
A Technician’s Notebook: The Contractor’s Van Conundrum
A local contractor brought in his ’11 Express 3500, completely stumped. The dome lights would flicker, the radio would cut out, and sometimes the van wouldn’t start, leaving his crew stranded. He’d already replaced the battery and alternator. After hooking up the scan tool, I saw a storm of U-codes (communication errors) pointing to a network issue. Instead of chasing electrical gremlins for hours, experience pointed me straight to the BCM, which is located in the center dash on these vans. We swapped in a pre-programmed module, and instantly, all the ghost-like issues vanished. It’s a classic case where a single module failure mimics a dozen different problems.
Is Your Van Exhibiting These BCM Failure Signs?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Intermittent or non-functional power windows, door locks, or interior lighting.
- ✔ Security or anti-theft system malfunctions, leading to a no-crank/no-start condition.
- ✔ Erratic instrument cluster behavior or warning lights (like the airbag light) staying on.
- ✔ Communication error codes (U-codes) stored in the system, such as U0100, U0140.
- ✔ Horn, wipers, or other accessories activating unexpectedly or not at all.
- ✔ Problems with the HVAC (heating and air conditioning) controls.
Your Straightforward BCM Installation Guide
Installing your new 2008-2012 Express 3500 BCM is a manageable task for a confident DIYer. While specific steps may vary slightly, here is a general guide for the Express/Savana platform:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to allow the system to fully discharge.
- Locate the BCM: On most Express and Savana vans, the BCM is located behind the center dash panel, often near the radio or HVAC controls. You will need to remove some trim panels to gain access.
- Disconnect Connectors: Carefully unclip the multiple wiring harness connectors from the old BCM. They have locking tabs, so be gentle to avoid damage. Note their orientation.
- Remove the Old Module: Unbolt or unclip the old BCM from its mounting bracket and remove it from the vehicle.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location. Reconnect all wiring harnesses securely, ensuring each clip clicks into place.
- Reconnect Battery & Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all body functions—windows, locks, lights, radio, etc.—to confirm proper operation.
- Post-Installation Procedures: In some cases, you may need a scan tool for additional steps like an Airbag System Sync or a Brake Pedal Position Relearn, as detailed in our included instructions.
Verified Fitment Across Multiple GM Models
This BCM is a direct replacement for part number 20864767 and interchanges with a wide range of other GM part numbers. It is compatible with the following vehicles, among others. Please verify your original part number or contact us with your VIN to ensure perfect compatibility.
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.
Frequently Asked Questions
Does this BCM really come ready to install?
Yes. We program the module using the VIN you provide during checkout. This loads your vehicle’s specific software and options, making it a true plug-and-play solution that avoids a trip to the dealership.
What if my original part number isn’t 20864767?
This module replaces a long list of interchangeable GM part numbers. As long as your original part number is on our compatibility list, this module will work perfectly for your vehicle.
Do I need to return my old BCM?
No, there is no core charge for this part. You can keep your original module, which can be helpful for reference or as a backup.
What are the ‘post-install procedures’ mentioned?
On some GM models, after installing the BCM, additional system synchronizations like an airbag key setup or brake pedal position relearn are needed. These typically require a bi-directional scan tool and are only necessary if specific warning lights appear after installation.
Will this fix my no-start problem?
If your no-start issue is caused by the anti-theft system (a common BCM failure), then yes, this programmed BCM is the correct fix. It restores communication between your key, the BCM, and the engine computer.