If you’re dealing with bizarre electrical issues in your truck, you’re not alone. As a technician with over two decades of experience, I’ve seen countless GMT800-platform trucks, from the hardworking Silverado 3500 to the family-hauling Tahoe, come into the bay with problems that seem to have no rhyme or reason. Windows that won’t roll down, a security light that keeps you from starting the engine, or an HVAC system with a mind of its own. More often than not, the culprit is a failing Body Control Module (BCM). This module is the central command for your truck’s body electronics, and when it starts to go, it can cause a cascade of frustrating problems.
This isn’t just a replacement part; it’s a direct solution. We offer this high-quality Body Control Module, part number 15116066, which arrives at your doorstep fully programmed to your vehicle’s specific VIN. This means no trips to the dealership for expensive programming. You get a reliable, plug-and-play fix that restores the functionality you depend on every day. It’s the same solution I’d use in my own shop to get a customer’s truck back to 100%.
Case Study: A Tricky Diagnosis
A customer brought in his ’06 Silverado 2500HD with a laundry list of complaints: the radio would cut out, the driver’s side power window worked intermittently, and the airbag light was on. He’d already replaced the battery and checked all the fuses. A scan showed a B1001 DTC (Option Configuration Error) and a few U-codes indicating loss of communication. After verifying the main power and ground connections to the BCM were solid, it was clear the module itself was failing internally. Swapping in a pre-programmed BCM like this one solved all the issues in under 10 minutes. It’s a common failure point that can mimic dozens of other problems.
Is Your Truck Showing These Symptoms?
- ✔ Unresponsive or erratic power windows, door locks, or interior lights.
- ✔ HVAC blower motor or climate controls not working correctly.
- ✔ The security system preventing the engine from starting (no-start condition).
- ✔ An illuminated airbag warning light, often with a DTC like B1001.
- ✔ Erratic windshield wiper operation or failure to turn off.
- ✔ Communication-related Diagnostic Trouble Codes (DTCs) across multiple systems.
A Straightforward Guide to Installation
Getting your truck back in order is easier than you think. For most models this part fits, the BCM is located under the driver’s side dash, near the steering column. The entire job typically takes less than 15 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents shorts and helps reset the vehicle’s systems.
- Locate the Module: On most Silverado and Sierra models, you’ll find the BCM mounted to a bracket just to the left of the steering column. In Express and Savana vans, it’s typically behind the center dash panel.
- Swap the Part: The BCM is held in by a few clips or small bolts. Carefully unplug the electrical connectors (they have locking tabs, so don’t just pull) and remove the old module. Install the new module, reconnect the connectors securely, and re-mount it.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and test all the functions: lights, locks, windows, wipers, and HVAC to ensure everything is working as it should.
- Post-Install Checks: In some cases, an airbag light may remain on. This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system. This is not always necessary but is a possibility.
Guaranteed Fitment for Your GM Truck or SUV
This 2003-2007 Silverado 3500 BCM is a direct-fit replacement for a wide range of General Motors vehicles. It is interchangeable with part numbers 10383536, 15136225, 15198116, and others. Please verify your vehicle from the list below to ensure proper compatibility.
Compatible Models Include:
- Chevrolet Avalanche 1500/2500 (2003-2006)
- Chevrolet Silverado 1500/2500/3500 (2003-2007 Classic)
- Chevrolet Suburban 1500/2500 (2003-2006)
- Chevrolet Tahoe (2003-2006)
- Chevrolet Express Van 1500/2500/3500 (2004-2007)
- GMC Sierra 1500/2500/3500 & Denali (2003-2007 Classic)
- GMC Yukon & Yukon XL 1500/2500 (2003-2006)
- GMC Savana Van 1500/2500/3500 (2004-2007)
- Cadillac Escalade, ESV, EXT (2003-2006)
- Hummer H2 (2003-2007)
Note: ‘Classic’ style for 2007 models refers to the body style with the creased door skin, not the newer GMT900 body style.
Frequently Asked Questions
Will this BCM need to be programmed by a dealer?
No. We program the module to your vehicle’s VIN before shipping. It arrives ready for installation, saving you time and money on dealership service fees.
What is a core charge?
There is no core charge for this part. You can keep your old module without needing to send it back to us, simplifying the repair process.
My airbag light is on after installation. What should I do?
This is a known possibility. The new BCM needs to be electronically ‘introduced’ to the airbag system’s Sensing and Diagnostic Module (SDM). A repair shop with a professional-grade scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.
Is this a difficult part for a DIYer to replace?
Not at all. With basic hand tools and about 15 minutes of your time, you can easily swap this module. The most important step is disconnecting the battery first.
What if my brake lights aren’t working correctly after install?
On some models, a Brake Pedal Position (BPP) sensor relearn procedure may be required. This ensures the BCM knows the exact position of the brake pedal for proper brake light and traction control operation. This also requires a bi-directional scan tool.