Tired of Chasing Electrical Gremlins in Your GM Truck?
If your 2002-2006 Chevrolet Avalanche 2500 is suffering from a mind of its own—with flickering lights, a dead HVAC system, or power windows that won’t budge—the root cause is often a failing Body Control Module (BCM). This component is the central nervous system for your truck’s comfort and convenience features. When it fails, it can create a cascade of frustrating and seemingly unrelated problems. This replacement module, part number 15137395, is the definitive, hassle-free solution. We pre-program it to your vehicle’s specific VIN, so it arrives ready for a true plug-and-play installation, getting you back on the road without an expensive trip to the dealership.
A Technician’s Notebook
I’ll never forget a 2005 Silverado 2500 that came into my bay. The owner was at his wit’s end. His A/C was dead, the radio would cut out, and his power locks worked intermittently. He’d already replaced the battery and checked fuses. After hooking up my scanner, I saw a slew of communication codes. In my 20+ years of experience, these symptoms almost always point to a single culprit on these GMT800 platforms: a compromised BCM, often due to failing internal solder joints or a bad ground. We installed a VIN-programmed 2002-2006 Avalanche 2500 Body Control Module, and within minutes, every single issue was resolved. It’s a common failure, but thankfully, it’s an easy fix with the right part.
Is Your Truck Exhibiting These Telltale Signs?
- ✔ Unresponsive or erratic HVAC controls, including a blower motor that’s stuck on one speed or won’t turn on at all.
- ✔ An illuminated airbag warning light, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Power accessories like windows, door locks, or interior/exterior lights failing to operate correctly.
- ✔ Vehicle security system malfunctions, including the alarm going off randomly or a no-start condition due to the anti-theft system.
- ✔ A cluster of seemingly unrelated electrical communication codes stored in the vehicle’s memory.
- ✔ Intermittent electrical functions that seem to have no logical pattern.
A Straightforward 5-Minute Installation Guide
You don’t need to be a professional mechanic to install this part. The process is simple and requires basic hand tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the system.
- Locate the BCM: On most GM trucks and SUVs of this era, including the Avalanche, the BCM is located under the driver’s side dashboard, near the steering column. It’s a black box with several multi-pin electrical connectors.
- Swap the Module: Carefully unplug the connectors from the old BCM. They have locking tabs that need to be pressed. Once disconnected, remove the old module and install the new one in its place.
- Reconnect and Test: Securely plug the connectors into your new, pre-programmed BCM. Reconnect the battery terminal. Start the vehicle and test all functions—lights, windows, locks, wipers, and HVAC—to confirm the repair.
- Post-Installation Checks: In some cases, a professional scan tool may be needed for a ‘Setup SDM Primary Key’ procedure if the airbag light remains on. This syncs the new BCM with the airbag system.
Verified Fitment for Your GM Truck or SUV
This module is a direct replacement for part number 15137395 and other interchangeable numbers. It is guaranteed to fit a wide range of General Motors vehicles, including:
- ✔ Chevrolet Avalanche 1500/2500 (2002-2006)
- ✔ Chevrolet Silverado & GMC Sierra 1500/2500/3500 (2003-2007 Classic)
- ✔ Chevrolet Suburban & GMC Yukon XL 1500/2500 (2003-2006)
- ✔ Chevrolet Tahoe & GMC Yukon (2003-2006)
- ✔ Cadillac Escalade, ESV, EXT (2003-2006)
- ✔ Hummer H2 (2003-2007)
- ✔ Chevrolet Express & GMC Savana Vans (2004-2007 with specific options)
Frequently Asked Questions
Do I need to take this part to a dealership for programming?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for immediate installation, saving you time and money.
What exactly does a Body Control Module do?
The BCM acts as the main computer for your vehicle’s body electronics. It controls non-engine related functions like power windows, door locks, interior and exterior lighting, wipers, the security system, and the HVAC system.
Where is the BCM located on my 2004 Avalanche 2500?
The BCM is typically found under the driver-side dashboard, to the left of the steering column. It is a black plastic box with three or four large electrical connectors.
My airbag light is on after installing the new BCM. What’s wrong?
This is a normal possibility. The new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). This requires a ‘Setup SDM Primary Key in BCM’ procedure using a professional-grade bidirectional scan tool.
Do I have to send my old part back? Is there a core charge?
No, there is absolutely no core charge. You can keep your old part, making the replacement process simple and hassle-free.