Fix Persistent Electrical Problems in Your GM Truck
If you’re dealing with baffling electrical issues in your 2002-2006 Chevrolet Avalanche 2500, a failing Body Control Module (BCM) is often the culprit. As the central command center for your truck’s body electronics, a faulty BCM can cause a cascade of frustrating problems. This replacement BCM, part number 15137394, combined with our expert cloning service, is the most reliable and straightforward way to restore full functionality to your vehicle without expensive dealership programming.
Our cloning service makes this a true plug-and-play solution. You simply send us your original BCM, and we professionally transfer all the vehicle-specific data—including VIN, mileage, and option configurations—to this replacement unit. We then send both modules back to you. The result is a module that is a perfect electronic match for your truck, ensuring seamless integration and performance.
Case Study: A Tricky Diagnosis
A customer brought in a 2005 Sierra 2500HD with a laundry list of complaints: the radio would turn on and off, the driver’s side power window worked intermittently, and the security light was on, causing an occasional no-start. They had already replaced the battery and checked fuses. After connecting my scanner, I saw a handful of communication loss codes (U-codes) and a BCM-specific code, B1001. In my 20+ years of experience, these ghost-in-the-machine symptoms almost always point to a failing BCM. The internal circuit board develops micro-fractures, leading to erratic behavior. We performed our cloning service on a replacement BCM, and the customer’s truck was back to normal in a day, saving them hundreds compared to a dealership visit.
Is Your Avalanche Exhibiting These Electrical Gremlins?
A failing BCM doesn’t always trigger a check engine light. Instead, watch for these common symptoms that indicate it’s time for a replacement:
- ✔ Inoperative or erratic power windows, door locks, or interior lights.
- ✔ HVAC controls not responding or the blower motor working intermittently.
- ✔ The security system acting up, leading to a no-start or crank-no-start condition.
- ✔ The airbag or SRS warning light is illuminated on the dash, sometimes with DTC B1001.
- ✔ Communication errors with other modules on the vehicle’s data network.
- ✔ Wipers or other accessories activating on their own or not working at all.
Simple Steps to Swap Your BCM
Installation is a simple process that most DIY mechanics can complete in under 15 minutes. The BCM is typically located under the driver’s side dashboard.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On most GM trucks of this era, the BCM is a black plastic box with multiple wiring connectors, situated under the steering column.
- Remove the Old Module: Carefully unplug the wiring harnesses. They have locking tabs that need to be depressed. Once unplugged, unbolt or unclip the module from its mounting bracket.
- Install the New Module: Seat the cloned BCM into the mounting bracket and securely plug in all the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect and Test: Reconnect the battery terminal. Start the vehicle and test all functions: lights, windows, locks, HVAC, and wipers to confirm the repair.
Post-Installation Procedures
Our cloning service handles all the necessary programming, but in some cases, your vehicle may require a simple relearn procedure. These can typically be performed with a capable bi-directional scan tool.
- Airbag System Sync: If the airbag light remains on after installation, a technician will need to perform the “Setup SDM Primary Key in BCM” procedure to sync the modules.
- Brake Pedal Position Relearn: Some models may require this relearn to ensure proper brake light and traction control operation.
Disclaimer: Always consult a factory service manual or a qualified technician if you are unsure about any step. Specific procedures can vary slightly by vehicle model and year.
Verified Compatibility for Your GM Truck or SUV
This BCM is a direct replacement for part number 15137394 and other interchangeable numbers. It fits a wide range of popular GM models, including:
- Chevrolet Avalanche 2500 (2002-2006)
- Chevrolet Silverado 1500/2500/3500 (2003-2007 Classic)
- Chevrolet Suburban 1500/2500 (2003-2006)
- Chevrolet Tahoe (2003-2006)
- GMC Sierra 1500/2500/3500 (2003-2007 Classic)
- GMC Yukon & Yukon XL (2003-2006)
- Cadillac Escalade, ESV, EXT (2003-2006)
- Hummer H2 (2003-2007)
- Chevrolet Express & GMC Savana Vans (2004-2007, w/ opt PRP)
How does the cloning service work?
How does the cloning service work?
After you place your order, you’ll receive instructions to ship your original BCM to us. Our technicians will extract the unique data and flash it onto the replacement module. We then ship both your original module and the ready-to-install replacement back to you. This ensures 100% correct software for your vehicle’s specific options.
Do I need to send my original BCM? Is there a core charge?
Yes, you must send us your original module for the cloning process. There is no core charge, and your original module will always be returned to you along with the newly programmed replacement.
What if I still have problems after installation?
First, double-check all connector plugs to ensure they are fully seated. If issues persist, the problem may lie with a different component, such as a faulty switch, wiring, or another module. Our cloning process guarantees the BCM is not the issue.
What tools are required for installation?
Basic hand tools, like a socket set or nut driver, are usually all that’s needed to remove the BCM. No special programming tools are required for installation, though a bi-directional scanner may be needed for post-install relearn procedures like the airbag sync if the light is on.