If you’re dealing with baffling electrical problems in your 2004-2007 Chevrolet Express 3500 Van, the Body Control Module (BCM) is often the culprit. As the central command for your vehicle’s body electronics, a failing BCM can cause a cascade of issues that disrupt your workday and compromise safety. This replacement BCM, part number 15137395, arrives fully programmed to your van’s specific VIN, eliminating the need for expensive dealership visits and getting your workhorse back on the road fast.
Case Study: The Contractor’s Van
I recently had a 2006 Express 3500 work van come into my shop. The owner, a local plumber, was frustrated. His dome lights wouldn’t turn off, the power locks worked intermittently, and the HVAC blower was completely dead—a major problem during a heatwave. He’d already replaced the blower motor resistor with no luck. After a quick scan, I saw a handful of communication codes pointing to the BCM. We swapped in a VIN-programmed module, and within 10 minutes, every single issue was resolved. This isn’t just a part; it’s a solution that prevents costly downtime.
Is Your Work Van Showing These Electrical Faults?
A faulty BCM can manifest in numerous ways. If your Express or Savana van is experiencing these problems, this module is the likely solution.
- ✔ Intermittent or non-functional HVAC controls, including a blower motor that won’t turn on.
- ✔ Power windows or door locks that work sporadically or not at all.
- ✔ An active airbag warning light, often accompanied by diagnostic trouble code (DTC) B1001.
- ✔ Security system faults, leading to a no-start condition where the engine cranks but won’t fire.
- ✔ Strange lighting behavior, such as headlights, tail lights, or interior lights staying on or not working.
- ✔ A cluster of communication DTCs related to body systems.
A Straightforward Guide to BCM Installation
For the Chevrolet Express and GMC Savana vans, the BCM is one of the easier modules to access. You don’t need a vehicle lift or complex tools. The entire process should take less than 15 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: In the 2004-2007 Express 3500 Van, the BCM is typically found in the center dash area, often accessible by removing a lower dash panel.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have release tabs that need to be pressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
- Install the New BCM: Mount the new, VIN-programmed BCM in place and securely reconnect all electrical harnesses. Ensure they click into place.
- Reconnect and Test: Reconnect the negative battery terminal. Start the vehicle and test all functions: lights, wipers, HVAC, power locks, and windows to confirm the repair.
Important Post-Installation Note: In some cases, an airbag light may persist. This requires a professional scan tool to perform the “Setup SDM Primary Key in BCM” procedure to sync the modules. This is a simple software step, not a defect in the part.
Verified Fitment for Your GM Vehicle
This Body Control Module is a direct-fit replacement for a wide range of GM trucks and vans. While this page focuses on the 2004-2007 Express 3500 BCM, it is also compatible with the following vehicles, provided they have the correct options. This part is interchangeable with part numbers 15116066, 15137395, and others listed in the product details.
- Chevrolet Express / GMC Savana 1500/2500/3500 Vans (2004-2007) with commercial tradesman package (opt PRP)
- Chevrolet Silverado & GMC Sierra 1500/2500/3500 Trucks (2003-2007 Classic)
- Chevrolet Avalanche, Suburban, Tahoe (2003-2006)
- GMC Yukon & Yukon XL (2003-2006)
- Cadillac Escalade, ESV, EXT (2003-2006)
- Hummer H2 (2003-2007)
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean for me?
It means this BCM arrives ready for installation. We flash it with your van’s specific Vehicle Identification Number and the latest GM software before shipping. This ensures all your vehicle’s options work correctly and saves you a trip to the dealership for expensive programming.
Where is the BCM located on my 2005 Express 3500 Van?
On the 2004-2007 Express and Savana vans, the BCM is located in the center of the dashboard, usually behind the lower trim panel below the radio and HVAC controls.
My airbag light is on. Will this BCM fix it?
This module can resolve airbag light issues caused by a faulty BCM (like DTC B1001). However, after installation, the new BCM may need to be electronically ‘introduced’ to the airbag’s computer (SDM). This is called ‘Setup SDM Primary Key’ and requires a bi-directional scan tool.
Is this a difficult part for a DIYer to install?
No, this is considered a beginner-friendly installation. Accessing and swapping the BCM on an Express van typically requires only basic hand tools and takes less than 15 minutes.
Do I need to return my old BCM?
No, there is no core charge for this part. You can keep your old module without any hassle or extra fees.