Restore Full Functionality to Your GM Vehicle
Are you battling a host of strange and frustrating electrical issues in your 2008-2012 Savana 1500 Van? From power windows that won’t cooperate to a security light that randomly appears, a failing Body Control Module (BCM) is often the culprit. The BCM acts as the central command center for your vehicle’s body electronics, and when it fails, it can create a cascade of problems that are difficult to diagnose. This replacement Body Control Module, part number 20921435, is the definitive solution to restore your vehicle’s electronic systems to factory-perfect operation.
We take the guesswork and hassle out of the repair process. Unlike a blank module from a dealership that requires expensive programming, this BCM arrives at your door pre-programmed to your vehicle’s specific VIN. We load it with the latest GM software updates, ensuring optimal performance and compatibility. This plug-and-play approach saves you time, money, and a trip to the service center.
From the Diagnostic Bay
We recently had a customer with a 2011 Express Van who was about to give up. His power locks would work intermittently, the radio would shut off on its own, and the interior dome light had a mind of its own. He had already replaced two door lock actuators and a radio head unit, spending hundreds with no fix. When he finally brought the van to us, a quick scan revealed multiple communication codes pointing to the BCM. After installing one of our VIN-programmed modules, every single one of his phantom electrical gremlins vanished. It’s a classic case where the central ‘brain’ was the issue, not the individual components.
Common Symptoms of a Failing 2008-2012 Savana BCM
Is Your Vehicle Showing These Signs?
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior or exterior lights staying on, flickering, or not working at all.
- ✔ The anti-theft or security system engaging incorrectly, preventing the engine from starting.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Inconsistent operation of the radio, climate controls, or windshield wipers.
- ✔ False warning lights on the instrument cluster (e.g., ABS, Airbag, Check Engine).
- ✔ Complete loss of communication with the BCM when using a diagnostic scan tool.
Simple Installation Process
Your new module is ready for installation right out of the box. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and our technicians will handle the programming. Once you receive the part, you can install it. While the process is straightforward, some vehicles may require a simple relearn procedure after installation for systems like the airbag or brake pedal position sensor. These procedures are noted below and can often be performed by a local mechanic if needed.
Post-Installation Procedures:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is necessary. This requires a professional-grade scan tool to sync the systems.
- Brake Pedal Position Relearn: A recalibration of the brake pedal position sensor may be required on some models to ensure correct brake light and traction control functionality.
Always consult a factory service manual or a qualified technician for vehicle-specific guidance.
Guaranteed Fitment for a Wide Range of GM Vehicles
This BCM is a direct replacement for multiple part numbers and fits a broad selection of GM cars, trucks, and SUVs. Please verify your vehicle is on the list 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.
Frequently Asked Questions
What is a BCM and what does it do?
The Body Control Module (BCM) is a computer in your vehicle that manages and controls electronic accessories like power windows, locks, lights, wipers, the security system, and climate controls.
Is this part truly plug-and-play?
Yes, it is. We program the module to your vehicle’s VIN before shipping, so it’s ready for installation upon arrival. In some cases, a minor ‘relearn’ procedure may be needed for specific subsystems like the airbag, as noted in the description.
How do I provide my VIN?
You can add your 17-digit VIN in the notes section at checkout or send it to us in a message after you place your order. We cannot program and ship the module without it.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.
Will this fix my ‘Service Theft System’ message?
A faulty BCM is a very common cause of security system issues and false ‘Service Theft System’ warnings. Because this module is programmed to your VIN, it correctly syncs with your vehicle’s anti-theft system, resolving these problems in most cases.