Tired of Unpredictable Electrical Problems in Your GM Truck?
If you’re dealing with a 2003-2006 Chevrolet Avalanche 1500 that seems to have a mind of its own—windows that won’t roll down, a security light that stays on, or an HVAC system that’s given up—you’ve likely met the common culprit: a failing Body Control Module (BCM). As a technician with over two decades of experience, I’ve seen these exact issues countless times. The BCM is the central command for your truck’s body electronics, and when it fails, it can cause a cascade of frustrating and seemingly unrelated problems. This replacement BCM, part number 15064149, is the definitive, hassle-free solution to restore full functionality and peace of mind.
The biggest advantage we offer is that this module arrives at your door fully programmed to your vehicle’s specific VIN. This means you can skip the expensive trip to the dealership and the extra labor costs for programming. It’s a true plug-and-play fix designed for both professional installers and dedicated DIYers.
From the Diagnostic Bay: The Case of the Haunted Avalanche
A customer brought in his ’05 Avalanche, convinced it was possessed. The radio would switch off, the driver’s side window worked intermittently, and the airbag light was on, throwing a B1001 code. He’d already replaced the window switch and checked fuses. After a quick scan, I suspected the BCM. These modules often fail internally, causing poor communication between components. We swapped in a VIN-programmed BCM like this one. In less than 10 minutes, every single issue was gone. It’s a textbook example of how a single component can create widespread electrical chaos, and why a reliable, pre-programmed module is the most efficient fix.
Common Signs of a Failing BCM
If your vehicle is showing any of these symptoms, a faulty BCM is the most likely cause. Replacing your 2003-2006 Avalanche 1500 BCM can resolve these issues permanently.
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights flickering, staying on, or failing to turn on.
- ✔ HVAC controls are unresponsive, or the blower motor works intermittently.
- ✔ The anti-theft or security system malfunctions, causing a no-start condition.
- ✔ An active airbag warning light, often with communication DTCs like B1001.
- ✔ Inconsistent windshield wiper operation.
- ✔ False warnings appearing on the instrument cluster.
A Straightforward Guide to Installation
You don’t need to be a master mechanic to install this part. The process typically takes just a few minutes with basic tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and allow the system to reset.
- Locate the BCM: On most GM trucks and SUVs of this era, the BCM is located under the driver’s side of the dashboard, near the steering column.
- Remove the Old Module: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the old module from its mounting bracket.
- Install the New BCM: Seat the new, VIN-programmed module into the bracket and securely plug in all the electrical connectors. You’ll 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, wipers, and HVAC to confirm the repair was successful.
Post-Installation Note: In some cases, a ‘Setup SDM Primary Key in BCM’ procedure may be needed with a scan tool if the airbag light remains on. Additionally, a Brake Pedal Position relearn might be required on certain models. And the best part? There is absolutely no core charge—you can keep or discard your old part without any hassle.
Will This Fit My Truck?
This module is a direct replacement for part number 15064149 and other interchangeable numbers. It is guaranteed to fit the following vehicles:
GMC: Sierra 1500/2500/3500 & Denali (03-07 Classic), Yukon & Yukon XL (03-06), Savana Van (04-07 w/PRP).
Cadillac: Escalade, ESV, EXT (03-06).
Hummer: H2 (03-07).
Frequently Asked Questions
Does this Body Control Module require programming?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for plug-and-play installation, saving you a trip to the dealership.
What is the main cause of BCM failure in these trucks?
From my experience, failures are often due to internal circuit board issues, cracked solder joints from vibration and heat cycles, or voltage spikes from other electrical problems like a bad alternator.
Will this fix my airbag light?
If the airbag light is on due to a BCM communication error (like DTC B1001), this module will resolve the root cause. However, you may need a professional scan tool to perform an ‘SDM Key Setup’ to sync the new BCM with the airbag system and clear the light.
Is this a difficult part for a DIYer to replace?
Not at all. The BCM is typically located under the dash and held in by simple clips or bolts. With the module being pre-programmed, the physical swap is a simple, 5-10 minute job for most people.
Do I need to return my old BCM?
No. We do not require a core return for this part. You can keep your old module without any extra charges or hassle.