Are you tired of chasing electrical gremlins in your 2003-2006 Chevrolet Avalanche 1500? One minute the power locks work, the next they don’t. The A/C blower motor has a mind of its own, and a persistent airbag light is staring you down. These aren’t separate issues; they’re classic signs of a failing Body Control Module (BCM). As the central command for your truck’s body electronics, a faulty BCM can cause widespread, frustrating problems. This replacement module, part number 15137394, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play repair.
Forget about expensive dealership visits and programming fees. We handle the complex part for you. Simply provide your vehicle’s VIN at checkout, and our technicians will flash the module with the latest GM software and your vehicle’s unique configuration. This ensures all onboard systems communicate correctly from the moment you install it, restoring the reliable performance you depend on. This is the same fix I’ve performed hundreds of times in my own shop to resolve these exact issues for good.
A Technician’s Notebook: The Misleading Airbag Light
A customer brought in a 2005 Silverado with the airbag light on. They’d already replaced the clock spring and an impact sensor with no luck. The scanner showed a DTC B1001: ‘Option Configuration Error.’ This code doesn’t point to a faulty airbag component, but a communication breakdown. The Sensing and Diagnostic Module (SDM) couldn’t verify its security key with the BCM. After confirming the wiring was intact, we knew the BCM’s internal processor was failing. We installed one of our VIN-programmed BCMs, and the light went out immediately after the ‘Setup SDM Primary Key’ procedure. It’s a prime example of how a failing BCM can send you chasing the wrong parts.
Is Your Avalanche Showing These Symptoms?
- ✔️ Inconsistent or non-working power windows, door locks, or interior/exterior lights.
- ✔️ HVAC system problems, such as the blower motor not working or switching speeds randomly.
- ✔️ The security light is on or flashing, potentially causing a no-start condition.
- ✔️ An active airbag warning light, often accompanied by communication DTCs like B1001.
- ✔️ Wipers operating erratically or not at all.
- ✔️ False warnings on the driver information center (DIC).
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal on your truck’s battery before starting any electrical work.
- ✔ Locate the BCM: On most GM trucks of this era, including the Avalanche, the BCM is located under the driver’s side of the dashboard, near the steering column. It’s a black box with several large multi-pin connectors.
- ✔ Swap the Module: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once unplugged, unclip or unbolt the old BCM and remove it.
- ✔ Install the New BCM: Mount your new, pre-programmed BCM in place and firmly reconnect all electrical connectors until they click.
- ✔ Reconnect and Test: Reconnect the battery terminal. Start the vehicle and test all functions: lights, locks, windows, wipers, and HVAC to confirm the repair.
Post-Installation Note: In some cases, if the airbag light remains on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ function. A ‘Brake Pedal Position Relearn’ may also be required on certain models. This is a simple procedure for any qualified shop.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15137394 and other interchangeable numbers. It provides guaranteed fitment for the following models (and more):
- ✔️ 2003-2006 Chevrolet Avalanche 1500 (Body Control, under steering column)
- ✔️ 2003-2006 Chevrolet Silverado, Suburban & Tahoe
- ✔️ 2003-2006 GMC Sierra, Yukon & Yukon XL
- ✔️ 2003-2006 Cadillac Escalade, ESV & EXT
- ✔️ 2003-2007 Hummer H2
- ✔️ 2004-2007 Chevrolet Express & GMC Savana Vans (with opt PRP)
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, which saves you the time and hassle of a return shipment.
What does ‘VIN Programmed’ mean for me?
It means the module arrives ready for installation with no extra steps. We flash it with your vehicle’s specific software, so it works correctly with your existing keys, security system, and other options right out of the box.
Will this fix my airbag light?
If your airbag light is on due to a BCM communication error (like DTC B1001), this module will resolve the root cause. After installation, a simple ‘SDM Key Sync’ procedure with a pro-level scan tool may be required to turn off the light.
Is this a difficult part to replace myself?
Not at all. For most DIYers with basic tools, this is a very simple repair. The BCM is typically easy to access under the steering column, and the entire swap takes less than 15 minutes.
What if I have a different part number on my old module?
This module is interchangeable with many part numbers, including 15116066, 15136225, 15198116, and others. As long as your vehicle is on the compatibility list, this part will function correctly.