Fix Your GM Van’s Electrical Gremlins for Good
If your 2004-2007 Savana 3500 Van is suffering from bizarre electrical issues, a failing Body Control Module (BCM) is the most likely culprit. As the central command for your vehicle’s body electronics, a faulty BCM can cause a cascade of frustrating problems, from a dead instrument cluster to a van that won’t start. This OEM-quality 15116066 Body Control Module is the definitive solution. We pre-program it to your van’s specific Vehicle Identification Number (VIN), making it a true plug-and-play fix that eliminates the need for an expensive trip to the dealership.
Case Study: A Tricky Diagnosis
I remember a fleet manager who brought in a 2006 Savana 3500 work van. The complaint was intermittent no-starts and the radio and interior lights would randomly turn on and off, even with the key out. His mechanics had already replaced the battery and checked all the grounds. After connecting my scanner, I saw a handful of communication loss codes pointing to the BCM. A failing BCM can create ‘phantom’ power draws and communication errors that mimic other problems. We installed one of our VIN-programmed modules, and the van was back in service the same afternoon. For a business, that kind of quick, reliable fix is money in the bank.
Is Your Savana Van Showing These Symptoms?
A failing BCM doesn’t always throw a check engine light. Instead, you’ll notice a pattern of strange electrical behavior. Over my 20 years in the shop, these are the most common signs I’ve seen linked to a bad 2004-2007 Savana 3500 BCM:
- ✔ Your power windows, door locks, or mirrors work intermittently or not at all.
- ✔ The heating and A/C controls are unresponsive, or the blower motor seems to have a mind of its own.
- ✔ The security system acts up, preventing the van from starting (blinking security light).
- ✔ You have an airbag light on the dash, often with a diagnostic trouble code like B1001 (Option Configuration Error).
- ✔ Interior or exterior lights flicker, stay on, or won’t turn on.
- ✔ The windshield wipers operate erratically or won’t park in the correct position.
A Straightforward Guide to Installation
One of the best parts of this solution is how simple it is to install. For the DIYer, this is a job you can do in your driveway in less than 10 minutes. For the professional mechanic, it’s a fast, profitable repair that gets your customer’s vehicle out of the bay quickly.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery before starting any electrical work.
- Locate the BCM: In the Savana and Express vans, the BCM is located in the center of the dashboard, typically accessible from below. It’s a black plastic box with several large multi-pin connectors.
- Swap the Module: Carefully unplug the electrical connectors from the old BCM. They have locking tabs, so be gentle. Unbolt or unclip the old module and swap in your new, pre-programmed unit.
- Reconnect and Test: Securely plug all connectors into the new BCM. Reconnect your battery terminal. Start the van and test all functions: lights, locks, windows, HVAC, and wipers.
Important Note: In some cases, particularly if your airbag light was on, a post-installation procedure like an ‘SDM Key Relearn’ may be required using a professional scan tool to sync the new BCM with the airbag system. This is a simple procedure for any qualified technician.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15116066 and is interchangeable with several other part numbers, including 15136225, 15198116, and 10383536. While it’s the correct part for the 2004-2007 Savana 3500 BCM with the commercial tradesman package (RPO code PRP), it also fits a wide range of other GM trucks and SUVs. Always verify your part number before ordering.
- GMC Savana / Chevrolet Express Vans (1500, 2500, 3500): 2004-2007 (with opt PRP)
- GMC Sierra / Chevrolet Silverado Trucks (1500, 2500, 3500): 2003-2007 (Classic body style, specific cab/trans options)
- GMC Yukon / Chevrolet Tahoe / Suburban: 2003-2006
- Cadillac Escalade (Base, ESV, EXT): 2003-2006
- Hummer H2: 2003-2007
Frequently Asked Questions
Do I need to have this programmed by a dealer?
No. We handle all the programming before we ship. This module arrives ready for installation, saving you hundreds in dealership fees and programming costs. Just provide your VIN when you order.
What tools are needed for installation?
For most applications, including the Savana van, you’ll only need basic hand tools like a socket wrench to disconnect the battery and possibly a small trim removal tool to access the module. No special electronic tools are required for the physical swap.
My airbag light is on. Will this fix it?
If the airbag light is caused by a faulty BCM (often showing code B1001), this part will correct the root cause. However, after installation, the system may require an ‘SDM Primary Key’ relearn procedure with a bi-directional scan tool to clear the light.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or recycle it without the hassle of sending it back to us.
How can I be sure the BCM is my problem?
The best way is a professional diagnosis. However, if you’re experiencing multiple, unrelated electrical issues like those listed in our symptoms section, the BCM is a very common point of failure on these GM vehicles.