Is Your GM Vehicle Plagued with Electrical Gremlins?
If you’re dealing with flickering lights, malfunctioning power windows and locks, a security system that acts on its own, or random warning lights on your dash, you’re likely facing a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it starts to fail, it can cause a wide range of frustrating and unpredictable issues. This is especially true for hardworking vehicles like the Chevrolet Express or GMC Savana van, where reliable electronics are critical.
Expert Pro Tip
Expert Pro Tip
Before you are certain the BCM is the culprit, always check the basics first. A weak or failing battery, poor battery cable connections, or a corroded ground strap can cause voltage drops that mimic BCM failure. A quick check with a multimeter can save you time and money. Ensure your battery holds a steady charge above 12.4 volts with the engine off.
Diagnosing and Replacing Your Express 3500 Body Control Module
A faulty Express 3500 Body Control Module can be difficult to diagnose, as its symptoms often overlap with other electrical problems. However, if you’ve ruled out other causes and are experiencing multiple, unrelated electronic failures, the BCM is the most probable cause. Replacing it used to mean a costly trip to the dealership for the part and mandatory programming. We eliminate that hassle. We provide a direct replacement BCM that is pre-programmed to your vehicle’s specific VIN, ensuring a straightforward installation process.
Common Symptoms of a Failing BCM:
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, door locks, or mirrors not working correctly.
- ✔ The security system or keyless entry failing intermittently.
- ✔ The radio or instrument cluster turning on and off randomly.
- ✔ False warning lights appearing on the dashboard (e.g., ABS, Airbag, Traction Control).
- ✔ Communication errors when a mechanic tries to scan the vehicle’s computer systems.
Simple Installation Process
Our goal is to get you back on the road quickly. After you purchase, simply provide us with your vehicle’s VIN. Our technicians will flash the module with the latest GM software specific to your van’s configuration. This means that for most functions, the installation is plug-and-play. However, please be aware of potential post-installation procedures.
Post-Installation Requirements
In some cases, additional steps are needed to sync the new BCM with other modules in your vehicle:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure must be performed with a professional scan tool. This is a security measure to ensure the airbag system is correctly communicating with the new Express 3500 Body Control Module.
- Brake Pedal Position Relearn: A brake pedal position sensor relearn may also be required to ensure your brake lights and traction control system function as intended.
This module is a direct replacement for a wide array of part numbers, including: 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, and 95151084.
Frequently Asked Questions
Expert Pro Tip
Before you are certain the BCM is the culprit, always check the basics first. A weak or failing battery, poor battery cable connections, or a corroded ground strap can cause voltage drops that mimic BCM failure. A quick check with a multimeter can save you time and money. Ensure your battery holds a steady charge above 12.4 volts with the engine off.