Restore Your Van’s Electrical System with a VIN-Programmed BCM
If you’re dealing with bizarre electrical problems in your 2008-2012 Chevy Express 2500—like flickering dash lights, malfunctioning power windows, or a security system that randomly prevents your van from starting—you’re not alone. These are classic signs of a failing Body Control Module (BCM). As the central hub for your vehicle’s body electronics, when the BCM goes bad, it can feel like your workhorse van is possessed. This module is your direct-fit, reliable solution. We flash it with the latest GM software using your van’s specific VIN, so it arrives ready to install, saving you a costly trip to the dealership for programming.
Case Study: The Contractor’s Intermittent No-Start
A contractor brought his 2011 Express 2500 work van into my shop, completely frustrated. Some days it started fine, other days it was dead in the water with the security light flashing. His power locks worked intermittently, and the dome light had a mind of its own. He’d already replaced the battery and checked the alternator. After hooking up my scan tool, I saw several communication loss codes (U-codes) pointing to the BCM. On these vans, the BCM is located in the center dash, an area susceptible to moisture from a leaky windshield seal or spilled drinks. Sure enough, we found faint corrosion on the BCM connector pins. A failing BCM was disrupting the Passlock security signal to the PCM, causing the intermittent no-start. Installing a VIN-programmed BCM solved all the issues at once, getting him back to work without the worry of being stranded.
Are These BCM Failure Symptoms Familiar?
A faulty BCM can cause a wide range of frustrating issues. If your Express Van is showing any of these signs, a failing module is the likely culprit. Check for diagnostic trouble codes like U0140, U0155, or various B-series codes.
- ✔ Power windows, door locks, or mirrors operate erratically or not at all.
- ✔ Interior or exterior lights flicker, stay on, or won’t turn on.
- ✔ The security or anti-theft system light is on, causing a no-start condition.
- ✔ The horn honks randomly or doesn’t work.
- ✔ Wipers behave unpredictably (e.g., won’t shut off).
- ✔ False warnings appear on the instrument cluster (e.g., ‘Service Airbag’).
- ✔ Communication issues with other modules on the vehicle’s network.
A Straightforward Guide to BCM Installation
Replacing the BCM on your Express Van is a manageable job for a DIYer with basic tools. Our pre-programming service eliminates the most difficult step—the dealer visit. Always consult a service manual for your specific vehicle’s procedures.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes to allow all systems to power down completely.
- Locate the BCM: On most Express and Savana vans, the BCM is located in the center dash area, often accessible by removing lower dash panels or the glove box.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
- Install the New Module: Mount your new, VIN-programmed BCM in the same location and securely reconnect all electrical harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Relearns: Start the vehicle. While our programming handles most functions, you may need to perform a post-installation procedure like an airbag system sync or brake pedal position relearn if specific warning lights are present.
Important Post-Installation Notes: This module is sold with no core charge, so you can keep your old part. After installation, if your airbag warning light is on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. Additionally, some models may require a brake pedal position sensor relearn for proper brake light and traction control operation. These procedures are not always necessary but are important to be aware of.
Verified Vehicle Compatibility
This Body Control Module is a direct replacement for part number 20935349 and is compatible with a wide range of GM vehicles. We confirm fitment for your specific vehicle using the VIN you provide at checkout. It fits models including:
- Chevrolet Express 1500/2500/3500 Vans (2008-2012)
- GMC Savana 1500/2500/3500 Vans (2008-2012)
- Chevrolet Impala (2006-2012)
- Chevrolet Tahoe & Suburban 1500 (2010)
- GMC Yukon & Yukon XL 1500 (2010)
- Cadillac Escalade / ESV / EXT (2010)
- GMC Acadia (2007-2012)
- Chevrolet Traverse (2009-2012)
- Buick Enclave (2008-2012)
- …and many other GM cars, trucks, and SUVs. Please see the full fitment list for details.
Frequently Asked Questions
What exactly does the Body Control Module do?
The BCM is like the body’s brain for your van. It controls non-engine related functions, including power windows, locks, lights, security system, wipers, and the instrument cluster. When it fails, these systems can become unreliable.
Why do you need my VIN number?
Your Vehicle Identification Number (VIN) allows us to program the BCM with the exact software and settings for your van’s specific options and features. This ensures it works correctly right out of the box, just like a module from the dealer, but without the extra cost and hassle of dealership programming.
Is this a difficult part to install myself?
For someone with basic mechanical skills, it’s very manageable. The main challenge is typically accessing the module’s location within the dash. The most complex part—the software programming—is already done for you by our team before we ship it.
Will this fix my ‘Service Airbag’ light?
If the BCM is the cause of the light, this replacement will resolve the root problem. However, after installation, you may need a professional scan tool to perform a ‘sync’ procedure to clear the light, as the BCM and the airbag module (SDM) need to re-establish communication.
Is there a core charge for my old BCM?
No, there is no core charge. You are not required to send your old module back to us, which saves you time and return shipping costs.