Restore Full Functionality to Your GM Vehicle
Are you dealing with baffling electrical issues in your van or truck? Power windows with a mind of their own, dashboard lights flickering like a holiday display, or a security system that randomly prevents you from starting the engine? These aren’t just annoyances; they’re classic signs of a failing Body Control Module (BCM). As the central command for your vehicle’s body electronics, a faulty BCM can cause widespread and unpredictable problems. This isn’t a part you can afford to ignore, especially in a workhorse like an Express van.
This is a direct-fit replacement Body Control Module, part number 15948439, designed to solve those frustrating electrical gremlins. The biggest challenge with BCM replacement has always been the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. Simply provide us with your vehicle’s VIN during checkout, and our technicians will program the module with the latest GM software specifically for your vehicle. It arrives at your door ready for installation, saving you time, money, and a trip to the service center.
A Technician’s Notebook: The Case of the Unreliable Work Van
A contractor brought his 2011 Express 3500 into my bay with a list of complaints that seemed unrelated. The radio would shut off, the dome light wouldn’t work, and sometimes the power door locks wouldn’t respond to the key fob. He’d already replaced the battery and checked fuses. After connecting my scan tool, I found multiple ‘U’ codes, indicating a loss of communication between various modules. In my 20+ years of experience, this pattern almost always points to a single source of failure: the BCM. The internal logic board had developed micro-fractures from years of vibration and heat cycles. We installed a VIN-programmed BCM just like this one, and every single issue was resolved instantly. It’s a textbook example of how a single component can create system-wide chaos.
Is Your Vehicle Showing These Common BCM Failure Symptoms?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or won’t turn on at all.
- ✔ The security or anti-theft light is illuminated, causing a no-start condition.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Inaccurate or dead gauges on the instrument cluster.
- ✔ Diagnostic trouble codes (DTCs) related to lost communication, such as U0140, U0155, or U0164.
- ✔ Wipers operating intermittently or not parking in the correct position.
Your Straightforward BCM Installation Guide
Installing your new, pre-programmed 2008-2012 Express 3500 BCM is a manageable job for a confident DIYer. While the exact location can vary slightly by model, the process is generally similar.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- Locate the BCM: In most Express and Savana vans, the BCM is located behind the center dash panel, often near the fuse box or behind the glove compartment. You may need to remove a few trim panels for access.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that must be depressed. Once disconnected, unbolt or unclip the old module from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed BCM in the same location and securely re-attach all electrical connectors. You should hear a ‘click’ as they lock into place.
- Power Up: Reconnect the negative battery terminal. Turn the key to the ‘On’ position (without starting the engine) and test the functions that were previously failing—windows, locks, lights, etc.
Important Post-Installation Notes
While our programming handles the critical vehicle-specific functions, some systems may require a ‘handshake’ with the new BCM. Please be aware of the following potential procedures:
- Airbag System Sync: If your airbag warning light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the airbag system with the new BCM.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be necessary to ensure correct brake light and traction control operation.
- No Core Charge: You are not required to return your old module. This saves you the hassle and expense of a core return.
Disclaimer: Vehicle systems vary. Always consult a factory service manual or a qualified technician if you are unsure about any step of the process.
Verified Vehicle Compatibility List
This module is a direct replacement for a wide range of GM vehicles and interchanges with numerous part numbers to ensure a perfect fit. Please verify your vehicle is on this list. This module fits models including:
- ✔ Chevrolet Express 1500/2500/3500 Van (2008-2012)
- ✔ GMC Savana 1500/2500/3500 Van (2008-2012)
- ✔ Chevrolet Impala (2006-2013)
- ✔ Chevrolet Tahoe & Suburban 1500 (2010)
- ✔ GMC Acadia (2007-2012)
- ✔ Cadillac DTS (2006-2011) & CTS (2008-2013)
- ✔ Buick Enclave (2008-2012) & Lucerne (2006-2011)
- ✔ Hummer H2 (2008-2009)
- ✔ And many others listed in the detailed fitment data. Replaces part numbers 10382479, 15819552, 15948439, 20815898, 22860591, 25892622, and more.
Frequently Asked Questions
What exactly does a Body Control Module (BCM) do?
The BCM is a computer that acts as the central hub for your vehicle’s body electronics. It controls non-engine related functions like power windows, locks, lights, wipers, the security system, and the instrument cluster.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the BCM with the specific software and settings for your vehicle’s exact options and features. This makes the module ready to install right out of the box, avoiding a costly trip to the dealer for programming.
Is this part difficult to install myself?
For someone with basic mechanical skills, it’s a very manageable job. The primary tasks are removing a few dash panels for access and swapping electrical connectors. Our pre-programming service handles the most complex part of the job for you.
What if my airbag light turns on after installation?
This is not uncommon. The new BCM needs to be electronically introduced to the airbag’s computer (SDM). This requires a ‘Setup SDM Primary Key’ procedure, which can be done by a repair shop with a professional-grade diagnostic tool.
Do I need to send my old BCM back?
No. We do not require a core return. You can keep or dispose of your original module, saving you time and return shipping costs.