Restore Full Electrical Control to Your GM Vehicle
Is your 2008-2012 Chevrolet Express 3500 or other GM vehicle plagued by mysterious electrical problems? Flickering lights, malfunctioning power windows and locks, or a security system that acts on its own are common signs of a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it fails, it can cause a wide range of frustrating and unpredictable issues. This direct-fit replacement BCM, part number 20815898, is the definitive solution to restore your vehicle’s functionality and reliability.
We take the guesswork and high costs out of the repair process. Unlike a new module from a dealership, this unit comes pre-programmed specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our technicians will flash the module with the latest GM software updates and your vehicle’s specific configuration. This means no expensive trips to the dealer for programming, making for a simpler, more cost-effective installation.
From the Diagnostic Bay
We had a 2011 Savana 2500 work van come in with a complaint of a dead battery every morning. The owner had already replaced the battery twice and the alternator once, but the parasitic draw persisted. After hooking up a multimeter, we traced the draw to the BCM circuit. The module wasn’t allowing the vehicle’s networks to go to ‘sleep’ after shutdown, slowly draining the battery overnight. Swapping in a VIN-programmed BCM like this one solved the problem instantly. It’s a classic example of how a failing BCM can mimic other, more common component failures.
Diagnosing a Faulty Express 3500 BCM
A failing BCM can manifest in numerous ways, often making diagnosis tricky. If your van is experiencing several of the following symptoms simultaneously, the Body Control Module is a likely culprit. This module is the solution for a wide variety of electrical issues across many GM platforms.
- ✔ Erratic or non-functional interior and exterior lights (headlights, dome lights, dash lights).
- ✔ Power windows, door locks, or mirrors operating intermittently or not at all.
- ✔ The security system or keyless entry failing to work correctly.
- ✔ The horn honking unexpectedly or not working when pressed.
- ✔ Wipers behaving erratically (e.g., won’t turn off).
- ✔ False warning lights appearing on the instrument cluster.
- ✔ Unexplained parasitic battery drain leading to a dead battery.
Plug-and-Play Solution with Professional Programming
The key benefit of this module is our professional programming service. Modern vehicles have complex, interconnected systems. A new BCM must be initialized and programmed to communicate with the Engine Control Module (ECM), instrument cluster, and other components. Our process handles this for you. By flashing the unit with your VIN, we ensure it has the correct software and configuration for all the specific options your vehicle was built with. This makes the physical installation much more straightforward for you or your mechanic.
While this module is designed for a simple installation, some vehicles may require a post-installation relearn procedure. For example, if your airbag light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure may be needed using a professional scan tool. Similarly, a ‘Brake Pedal Position Relearn’ might be required on certain models. These are standard procedures that any qualified technician can perform if necessary.
This module is a direct replacement for a wide range of part numbers, including: 15921352, 25892622, 20935349, 22860591, and many more. It fits a vast array of GM vehicles from 2006-2013, including the Chevrolet Impala, GMC Acadia, Cadillac DTS, Buick Enclave, and of course, the Chevy Express and GMC Savana family of vans. Please verify your part number to ensure compatibility.
Frequently Asked Questions
What does a BCM do on my Express 3500?
The Body Control Module (BCM) on your Express 3500 acts as the central computer for all non-engine related electronics. It controls functions like your power windows, door locks, interior and exterior lighting, security system, wipers, and instrument panel warnings.
Do I need to program this BCM?
No. We handle the programming for you before shipment. After you place your order, you must provide us with your vehicle’s VIN. We will then flash the BCM with the correct GM software for your specific vehicle, making it ready for installation.
How do I know if my BCM is the problem?
Common symptoms of a failing BCM include multiple, unrelated electrical issues happening at once. For example, if your power locks, dome light, and radio all stop working intermittently, the BCM is a strong suspect. A proper diagnosis with a professional scan tool is the best way to confirm the failure.
Where is the BCM located on a 2008-2012 Express van?
On the Chevrolet Express and GMC Savana vans from this era, the Body Control Module is typically located behind the dash panel, in the center area. Always consult a service manual for the exact location and removal procedure for your specific model.
What is the process after I purchase?
Once your order is complete, please send us your 17-digit VIN. Our technicians will use this number to program the module with the latest software and your vehicle’s specific configuration. The module will then be shipped to you, ready to be installed.