Restore Full Electrical Function to Your GM Vehicle
Are you battling frustrating electrical gremlins in your 2008-2012 Express 3500 Van or other compatible GM vehicle? Issues like erratic power windows, malfunctioning door locks, a dead instrument cluster, or a security system that won’t cooperate are often signs of a failing Body Control Module (BCM). The BCM acts as the central nervous system for your vehicle’s body electronics, and when it fails, it can cause a wide range of confusing and disruptive problems. This replacement Body Control Module, part number 20935349, is the reliable, straightforward solution to get your vehicle back in perfect working order.
From the Diagnostic Bay
We had a 2011 Express work van come in that was a complete mystery to the owner. The radio would turn on and off by itself, the dome lights would flicker, and sometimes the power locks wouldn’t respond to the key fob. The battery and alternator checked out fine. After connecting our diagnostic scanner, we saw multiple communication error codes pointing to the BCM. A failing BCM was causing a data storm on the vehicle’s network, leading to all the bizarre symptoms. Installing a VIN-programmed BCM like this one resolved every single issue, saving the owner from endless diagnostic headaches and a costly trip to the dealership.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-working power windows, seats, and mirrors.
- ✔ Power door locks engaging or disengaging on their own.
- ✔ The security system or alarm acting erratically or preventing the car from starting.
- ✔ Instrument panel gauges or warning lights behaving strangely (e.g., lights staying on, gauges not working).
- ✔ Inconsistent operation of interior or exterior lighting.
- ✔ Problems with the keyless entry system.
Why Choose Our Pre-Programmed 2008-2012 Express 3500 BCM?
Getting your vehicle repaired shouldn’t be complicated. We make the process simple. Unlike a standard replacement part that requires a trip to the dealership for expensive programming, this BCM arrives at your door ready for installation. We use your vehicle’s Vehicle Identification Number (VIN) to flash the module with the latest GM software updates and your vehicle’s specific configuration. This ensures compatibility and proper function right out of the box, minimizing downtime and saving you money.
Installation and Post-Install Notes
While installation is straightforward for many, please be aware of potential post-installation procedures. Depending on your specific model and options, some systems may need to be re-synced with the new BCM. This can include:
- 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 new BCM with the airbag system.
- Brake Pedal Position Relearn: To ensure proper brake light and traction control operation, a brake pedal position sensor relearn might be required.
This module is a direct replacement for a wide range of part numbers, including 15819552, 20815898, 22860591, 25892622, and many more. Please check the comprehensive fitment list to confirm compatibility with your exact make and model.
Frequently Asked Questions
What exactly does the Body Control Module do?
The BCM is a computer that manages and controls many of your vehicle’s non-engine related functions. This includes power windows, locks, seats, mirrors, interior and exterior lighting, the security system, and the instrument cluster.
Is this part truly plug-and-play?
Yes, because we program it to your VIN before shipping, it is designed to be plug-and-play. However, as noted, some vehicles may require additional relearn procedures for systems like the airbags or brake pedal position sensor, which may require a professional scan tool.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot ship the module until we receive this information, as the programming is essential for the part to work in your vehicle.
What if my airbag light comes on after I install the BCM?
This is a known possibility. It means the new BCM needs to be electronically introduced to the airbag’s computer (SDM). A qualified technician with a high-level scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.
Do I need to send my old BCM back?
No. This part is sold without a core charge. You can keep your original module.