Fix Persistent Electrical Problems in Your GM Truck
If you’re dealing with baffling electrical issues in your Chevrolet Avalanche 2500, you’re not alone. The Body Control Module (BCM) is the central command for your vehicle’s comfort and security features. When it fails, it can cause a cascade of frustrating problems. This replacement BCM, part number 15064149, is the definitive solution. We pre-program it to your truck’s specific VIN, so it arrives ready for a simple, plug-and-play installation, getting you back on the road without a mandatory trip to the dealership.
Case Study: A Tricky Diagnosis
I once had a 2005 Silverado 2500 in the bay that was a real head-scratcher. The owner reported the radio would cut out, the driver’s side power window worked only when it wanted to, and occasionally the security light would flash, preventing a start. We checked grounds, tested switches, and couldn’t find a consistent fault. After hours of diagnostics, we decided to swap in a known-good BCM. Instantly, every problem vanished. The original BCM had an internal intermittent failure that wouldn’t throw a clear code. This experience proved that for these GMT800 platform trucks, a faulty BCM is often the root cause of the most elusive electrical gremlins.
Is Your Avalanche Showing These Electrical Faults?
A failing BCM can manifest in numerous ways. As the nerve center for your truck’s body electronics, its failure impacts multiple systems. Here are the most common indicators that your 2002-2006 Avalanche 2500 BCM needs replacement:
- ✔ Unresponsive or erratic power windows, door locks, or interior lights.
- ✔ HVAC system failures, such as a blower motor that won’t turn on or stays stuck on high.
- ✔ The security system light is flashing, resulting in a no-start or crank-no-start condition.
- ✔ An active airbag warning light on the dash, often with a related DTC like B1001 (Option Configuration Error).
- ✔ Wipers, radio, or other accessories functioning intermittently or not at all.
- ✔ A collection of communication or body-related Diagnostic Trouble Codes (DTCs).
A Straightforward Guide to Installation
One of the best parts of this solution is its simplicity. You don’t need to be a master mechanic to get your truck running right again. The entire process typically takes less than 10 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On most GM trucks like the Avalanche, the BCM is located under the driver’s side dashboard, near the steering column. It’s a black plastic box with several large multi-pin connectors.
- Swap the Modules: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Remove the old module (it’s usually held by simple clips or a couple of small bolts) and install the new one in its place.
- Connect and Power Up: Firmly plug the connectors into your new, pre-programmed BCM. Reconnect the negative battery terminal.
- Final Checks: Start the vehicle and test all functions—lights, locks, windows, wipers, and HVAC—to confirm the repair was successful.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15064149 and is interchangeable with a wide range of other GM part numbers, including 15116066, 15136225, and 15198116. It is guaranteed to fit the following models:
- Chevrolet: Avalanche 1500/2500 (2002-2006), Silverado 1500/2500/3500 (2003-2007 Classic), Suburban 1500/2500 (2003-2006), Tahoe (2003-2006), Express Van (2004-2007)
- GMC: Sierra 1500/2500/3500 & Denali (2003-2007 Classic), Yukon & Yukon XL 1500/2500 (2003-2006), Savana Van (2004-2007)
- Cadillac: Escalade, ESV, EXT (2003-2006)
- Hummer: H2 (2003-2007)
Frequently Asked Questions
Frequently Asked Questions
Do I need to have a dealership program this BCM?
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 if my airbag light is on after I install the new module?
In some cases, the new BCM needs to be electronically ‘shaken hands’ with the airbag’s computer (SDM). This requires a ‘Setup SDM Primary Key in BCM’ procedure with a professional scan tool to sync the systems and clear the light.
Is there a core charge for my old part?
No, there is no core charge. You can keep or dispose of your old module without the hassle of returning it.
Will this fix my truck’s no-start problem?
If your no-start issue is caused by the factory security system (Passlock/VATS) being controlled by a faulty BCM, then yes, this module is designed to resolve that specific problem.
What tools do I need for the installation?
For most models, you’ll only need basic hand tools, such as a socket wrench to disconnect the battery and possibly a small screwdriver or trim removal tool to access the BCM. No special electronic tools are required for the physical installation.
What does ‘Classic Style’ mean for 2007 models?
In 2007, GM produced both the old body style (GMT800, with a creased door skin) and the new body style (GMT900). This part fits the ‘Classic’ GMT800 models from that year.