Tired of Chasing Electrical Gremlins in Your GM Truck?
If your GMC Sierra, Chevy Silverado, or other GM truck is acting possessed—with flickering lights, a dead instrument cluster, a temperamental HVAC system, or power windows with a mind of their own—you’re not alone. After 20 years of diagnosing these vehicles, I’ve seen it all. The culprit is often a failing Body Control Module (BCM), the central hub for your truck’s comfort and convenience electronics. This module, part number 15137393, is the direct-fit, pre-programmed solution to restore order and get your truck functioning correctly again.
A Technician’s Notebook: The Silverado That Wouldn’t Start
A 2005 Silverado 2500 was towed into my bay with a classic no-start condition. The owner had already replaced the battery and alternator, but the security light was flashing and the starter wouldn’t engage. The dash lights would flicker randomly when the key was turned. Instead of jumping straight to the starter or ignition switch, my experience pointed me to the BCM. A quick scan showed a loss of communication code (U-series) and a B1001 DTC. We swapped in a VIN-programmed BCM, and the truck fired right up on the first try. It’s a textbook example of how a failing 2003-2007 Sierra 3500 BCM can mimic other, more expensive problems.
Common Signs of a Failing BCM
A faulty Body Control Module can cause a wide range of frustrating issues. If your truck is experiencing any of the following, a replacement is likely the solution:
- ✔ Intermittent or non-functional power windows, door locks, or interior lights.
- ✔ HVAC blower motor or climate controls not working correctly.
- ✔ The security system preventing the engine from starting (anti-theft light on).
- ✔ An illuminated airbag warning light, often with a B1001 diagnostic trouble code.
- ✔ Strange electrical behavior like wipers or headlights turning on by themselves.
- ✔ Communication errors with other modules on the vehicle’s network.
DIY-Friendly Installation: Get Back on the Road Fast
One of the best features of this module is the simple installation process. Because we program it to your vehicle’s VIN before shipping, you can avoid a costly trip to the dealership for programming. Most DIYers can complete this job in under 15 minutes with basic tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On most GM trucks like the Sierra and Silverado, the BCM is located under the driver’s side dashboard, near the steering column. It’s typically held in place by a few clips or small bolts.
- Swap the Part: Carefully unplug the electrical connectors from the old BCM. Remove the old module and install the new one in its place.
- Reconnect and Test: Plug the connectors firmly into your new BCM. Reconnect the battery terminal and start the vehicle to test all functions (lights, windows, locks, etc.).
Post-Installation Note: In some cases, particularly if the airbag light was on, a technician may need to perform a “Setup SDM Primary Key in BCM” procedure with a high-level scan tool to sync the new module with the airbag system. This is a quick procedure for any professional shop.
Will This Fit My Truck?
This Body Control Module is a direct replacement for a wide range of General Motors trucks and SUVs. It is an interchangeable replacement for part numbers 15137393, 15116066, 15136225, and many others. It fits the following models:
- GMC Sierra 1500/2500/3500/Denali (2003-2007 Classic)
- Chevrolet Silverado 1500/2500/3500 (2003-2007 Classic)
- Chevrolet Avalanche 1500/2500 (2003-2006)
- GMC Yukon / Yukon XL (2003-2006)
- Chevrolet Tahoe / Suburban (2003-2006)
- Cadillac Escalade / ESV / EXT (2003-2006)
- Hummer H2 (2003-2007)
- GMC Savana Van 1500/2500/3500 (2004-2007)
- Chevrolet Express Van 1500/2500/3500 (2004-2007)
This is the definitive solution for your 2003-2007 Sierra 3500 BCM replacement needs, ensuring full functionality is restored without hassle.
Frequently Asked Questions
Do I need to send my old BCM back?
No. There is no core charge for this part. You can keep your original module without any extra fees or hassle.
What does ‘VIN Programmed’ mean for me?
It means the module arrives ready for installation. We flash it with your truck’s specific Vehicle Identification Number and the latest GM software, so it communicates perfectly with your vehicle’s other systems right out of the box.
My airbag light is on. Will this fix it?
Yes, if the light is caused by a faulty BCM (like with code B1001). After installation, the light may stay on until an ‘SDM Key Relearn’ procedure is performed with a compatible scan tool to sync the modules.
Is this a difficult part to install myself?
Not at all. For most owners with basic hand tools, it’s a very straightforward process that takes less than 15 minutes. The location under the steering column is easily accessible.
Will this fix my power windows and locks not working?
Absolutely. The BCM is the primary controller for those functions. Replacing a faulty one is the most common and effective fix for those specific problems.
What if I have issues after installation?
Our parts are backed by a one-year warranty and expert support. While post-install relearn procedures are sometimes needed, we’re here to help guide you through the process.