Restore Full Functionality to Your GM Vehicle
Is your Chevrolet Express, GMC Savana, or other GM vehicle experiencing bizarre electrical issues? Problems like flickering lights, malfunctioning power windows and locks, a faulty security system, or even a no-start condition can often be traced back to a single component: the Body Control Module (BCM). The BCM acts as the central hub for your vehicle’s body electronics, and when it fails, it can create a cascade of frustrating and seemingly unrelated problems. This replacement Body Control Module, part number 20815898, is the definitive solution to get your vehicle back to factory-perfect operation.
From the Diagnostic Bay
We had a 2011 Express 2500 work van come into the shop that was driving the owner crazy. The dome lights would stay on intermittently, the power door locks worked only when they wanted to, and the battery would be dead every few mornings. The owner had already replaced the battery and alternator. After running diagnostics, we found communication errors pointing towards the BCM. Instead of a costly trip to the dealer, we installed one of our VIN-programmed modules. The installation was straightforward, and instantly, all the ghost-like electrical problems were gone. The van was back on the road earning money the same day.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-functional interior/exterior lights.
- ✔ Power windows, mirrors, or door locks operating erratically or not at all.
- ✔ The security system engaging randomly or preventing the vehicle from starting.
- ✔ Horn honking unexpectedly.
- ✔ Instrument cluster gauges behaving erratically or displaying warning lights.
- ✔ Unexplained parasitic battery drain leading to a dead battery.
- ✔ Communication failures with diagnostic scan tools.
Why Choose Our Express 2500 Body Control Module?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The biggest hurdle in replacing a modern BCM is the need for expensive, dealer-specific programming. We eliminate that step entirely. When you purchase from us, you provide your vehicle’s VIN, and we handle the rest. Our technicians will flash the module with the latest, most stable software updates directly from GM, ensuring it is perfectly matched to your vehicle’s factory options. This makes the installation process as simple as possible, saving you time and hundreds of dollars in dealership fees.
Installation and Post-Install Considerations
While this module is designed for a straightforward installation, some vehicles may require additional steps after the new BCM is connected. These are known as relearn procedures and are necessary to sync the new module with other systems in your vehicle.
- Airbag System Sync: If your airbag warning light illuminates after installation, a ‘Setup SDM Primary Key in BCM’ procedure is needed. This requires a professional-grade scan tool and syncs the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be necessary to ensure correct operation of the brake lights and traction control system.
Please note: Specific procedures can vary. We always recommend consulting a factory service manual or a qualified technician for detailed instructions for your specific vehicle.
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM is a computer that manages and controls many of your vehicle’s electronic accessories and body functions. This includes power windows, door locks, interior and exterior lighting, security systems, wipers, and more. It acts as a central gateway for these systems to communicate.
Is this part difficult to install?
For someone with moderate mechanical experience, the physical replacement is typically straightforward, often located under the dash. The main benefit of our product is that the complex programming is already done. However, some vehicles may require post-installation relearn procedures with a capable scan tool, as mentioned above.
How do I provide my vehicle’s VIN?
After you complete your purchase, we will contact you for your vehicle’s 17-digit VIN. You can also add it as a note during checkout. We cannot program and ship the module without this information, as it’s essential for matching the software to your vehicle’s specific configuration.
Do I need to send my old module back?
No, there is no core charge for this module. You can keep your original part.
Will this BCM fix my specific problem?
If your vehicle is exhibiting one or more of the symptoms listed, a failing BCM is a very likely cause. Proper vehicle diagnosis is always recommended, but this part is the correct solution for a confirmed BCM failure on the wide range of compatible GM vehicles listed.