Fix Your Truck’s Electrical Issues for Good
Are you tired of chasing electrical gremlins in your 2003-2006 Chevrolet Avalanche 1500? From flickering lights and a non-responsive HVAC system to frustrating no-start conditions, a failing Body Control Module (BCM) can make your reliable truck feel haunted. As the central command for your vehicle’s body electronics, a faulty BCM is often the root cause of these mysterious problems. This replacement Body Control Module, part number 15137394, arrives expertly programmed to your truck’s specific VIN, offering a direct-fit solution that restores full functionality without a costly trip to the dealership.
A Technician’s Notebook: The Case of the Erratic Silverado
I had a 2005 Silverado (which shares the same platform as the Avalanche) in my bay that was driving the owner crazy. The radio would turn on and off, the power locks worked intermittently, and the airbag light was on with a B1001 code. The owner had already replaced the battery and checked all the fuses. After connecting my scanner, I saw multiple communication loss codes across various systems. This pointed directly to a failing BCM. In my shop, I’ve diagnosed hundreds of these GMT800 platform trucks, and the BCM is a common failure point due to heat cycles and aging internal components. Swapping in a pre-programmed module like this one resolved all the issues in under 10 minutes. It’s the most effective and reliable fix.
Is Your Avalanche Showing These Symptoms?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. This is the definitive solution for your 2003-2006 Avalanche 1500 BCM problems.
- ✔ The air conditioning or heater controls have stopped working, or the blower motor runs erratically.
- ✔ Your power windows, door locks, or interior dome lights are malfunctioning.
- ✔ The security system is acting up, causing a “Security” light on the dash or a no-start condition.
- ✔ The airbag warning light is illuminated, often with a Diagnostic Trouble Code (DTC) like B1001 (Option Configuration Error).
- ✔ Wipers operate randomly or not at all.
- ✔ You’re seeing various communication or body-related DTCs on your scan tool.
A Straightforward Guide to Your BCM Installation
One of the best features of this module is its simple, plug-and-play installation. You don’t need to be a master mechanic to get your truck back in order. Just follow these steps:
- 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 vehicle’s systems.
- Locate the BCM: On your 2003-2006 Avalanche 1500, the BCM is conveniently located under the driver’s side of the dashboard, near the steering column. It’s a black box with several multi-pin electrical connectors.
- Swap the Module: Carefully unplug the electrical connectors from the old BCM. They have locking tabs, so be sure to depress them before pulling. Unbolt or unclip the old module from its mounting bracket and set it aside.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely re-attach all the electrical connectors. You’ll hear a click as they lock into place.
- Reconnect and Test: Reconnect your battery terminal. Start the vehicle and test all the functions that were previously malfunctioning—windows, locks, HVAC, lights, etc.
Important Post-Installation Note: In some cases, an airbag light may remain on. This requires a professional scan tool to perform the “Setup SDM Primary Key in BCM” procedure to sync the modules. This is a simple software step, not a defect in the part.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15137394 and other interchangeable numbers. While it is the correct 2003-2006 Avalanche 1500 BCM, it also fits a wide range of other GM trucks and SUVs. Please verify your part number or consult the list below:
CHEVROLET SILVERADO 1500/2500/3500 PICKUP 03-06 Crew Cab (under steering column)
CHEVROLET SILVERADO 1500/2500/3500 PICKUP 07 Classic, Crew Cab (under steering column)
CHEVROLET SUBURBAN 1500/2500 03-06 (under steering column)
CHEVROLET TAHOE 03-06 (under steering column)
GMC SIERRA 1500/2500/3500 PICKUP 03-06 Crew Cab (under steering column)
GMC SIERRA 1500/2500/3500 PICKUP 07 Classic, Crew Cab (under steering column)
GMC YUKON & YUKON XL 1500/2500 03-06 (under steering column)
CADILLAC ESCALADE, ESV, EXT 03-06 (under steering column)
HUMMER H2 03-07 (LH dash)
CHEVROLET EXPRESS & GMC SAVANA VANS 04-07 (center dash, w/ opt PRP)
Frequently Asked Questions
Do I need to take my truck to the dealer for programming?
No. This Body Control Module is pre-programmed to your vehicle’s VIN before shipping. It’s ready for installation right out of the box, saving you time and money.
Is there a core charge for my old part?
Absolutely not. You can keep your old module or dispose of it yourself. No need to worry about return shipping or waiting for a core refund.
What tools do I need for installation?
Installation typically only requires basic hand tools, such as a socket wrench to disconnect the battery and possibly a small screwdriver or trim tool to access the module. No special electronic equipment is needed for the physical swap.
What if my airbag light is on after I install the new BCM?
This is a normal possibility. The BCM and the airbag system (SDM) need to be electronically re-introduced. A repair shop or a technician with a bidirectional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to clear the light.
What does this part interchange with?
This module is a direct replacement for part number 15137394 and is also interchangeable with part numbers 15116066, 15136225, 15198116, 15257044, and others within this family.