Is Your GM Van or SUV Plagued by Electrical Gremlins?
If you’re dealing with flickering lights, malfunctioning power accessories, or strange warning messages on your dash, a failing Body Control Module (BCM) is often the culprit. The BCM acts as the central nervous system for your vehicle’s body electronics, controlling everything from the power windows and locks to the interior lighting and security system. When it starts to fail, it can cause a wide range of frustrating and unpredictable issues that can make your vehicle unreliable.
This is a direct replacement Body Control Module, part number 20839063, for a wide range of GM vehicles, including the 2008-2012 Chevrolet Express 2500 Van. To make your repair as simple as possible, we program the module to your vehicle’s specific VIN before shipping. This ensures compatibility and proper function right out of the box, saving you a costly trip to the dealership for programming.
From the Diagnostic Bay
We had a local contractor bring in his 2011 Express work van. The complaint was intermittent no-starts and the dome lights would randomly turn on overnight, draining the battery. He was losing money every time the van wouldn’t start. After checking the battery and alternator, our diagnostics pointed to an internal fault in the BCM. We installed a VIN-programmed module just like this one. The repair was straightforward, and the van was back in service the same afternoon, with all electrical issues resolved. It’s a common failure, but thankfully, it’s a straightforward fix.
Symptoms of a Failing Express 2500 Body Control Module
- ✔ Power windows, mirrors, or door locks working intermittently or not at all.
- ✔ Interior or exterior lights staying on, flickering, or failing to turn on.
- ✔ The anti-theft or security system preventing the vehicle from starting.
- ✔ Horn sounding unexpectedly or not working when pressed.
- ✔ Inaccurate gauge readings or random warning lights on the instrument cluster.
- ✔ Windshield wipers behaving erratically or not parking in the correct position.
Plug-and-Play Solution
Our goal is to get you back on the road quickly and affordably. By providing us with your VIN during checkout, you receive a module that is flashed with the latest GM software specific to your vehicle’s options. This eliminates the need for expensive dealer-only tools and procedures. Plus, there is no core charge, so you can keep your original module without the hassle of sending it back.
Installation & Post-Install Procedures
While this module is designed for a direct-fit, plug-and-play installation, some vehicles may require additional steps after the BCM is connected. These are known as ‘relearn’ or ‘setup’ procedures and are sometimes necessary 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-grade diagnostic tool. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be needed to ensure correct brake light operation and to satisfy the traction control system.
Disclaimer: Specific procedures can vary by vehicle. Always consult a factory service manual or a qualified technician for guidance.
Compatible 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 various electronic accessories, such as power windows, locks, lights, wipers, and the security system.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We must have this information to program the module before we can ship your order.
Is this part difficult to install?
For most DIY mechanics with basic tools, the physical installation is straightforward. The BCM is typically located under the dashboard. However, be aware that some vehicles may require post-installation relearn procedures with a diagnostic tool, as mentioned above.
Do I need to send my old BCM back?
No. This part has no core charge. You can keep your original module.
What happens if my airbag light is on after installation?
This indicates that the new BCM needs to be synchronized with your vehicle’s airbag system (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ will need to be performed by a mechanic with a professional diagnostic scan tool.
Will this fix my specific electrical problem?
This module will correct issues caused by a faulty BCM. While the symptoms listed are common indicators of BCM failure, we always recommend a proper diagnosis by a qualified technician to confirm the BCM is the root cause before ordering.