Restore Your Truck’s Brain and End Electrical Frustration
If you’re dealing with a cascade of bizarre electrical problems in your 2002-2006 Chevrolet Avalanche 2500—like windows that won’t roll down, a security light that won’t turn off, or an HVAC system with a mind of its own—the root cause is likely a failing Body Control Module (BCM). As the central command center for your truck’s body electronics, a faulty BCM can make your reliable vehicle feel unpredictable and unsafe. This isn’t just an annoyance; it’s a critical component failure that can leave you stranded.
This replacement Body Control Module, equivalent to GM part number 15136877, is the definitive solution. We take the guesswork and high cost out of the repair by programming the module to your vehicle’s specific VIN before it ships. This means no expensive trips to the dealership for programming. It arrives at your door ready for a true plug-and-play installation, restoring full functionality and peace of mind. Get your truck back to operating exactly as it should with a reliable, pre-configured 2002-2006 Avalanche 2500 BCM.
Case Study: A Tricky Diagnosis
A customer brought in a 2005 Silverado 2500 (which uses the same BCM) with a complaint that stumped two other shops. The radio would randomly shut off, the dome light would flicker, and occasionally, the truck wouldn’t start, showing only a ‘Service Security System’ message. They had already replaced the battery and checked the alternator. After hooking up my scan tool, I saw several communication DTCs, including a persistent B1001. In my 20+ years of experience, these ghost-like symptoms almost always point to a failing BCM. The internal logic board develops micro-fractures over time, causing intermittent connections. We installed a VIN-programmed BCM, and all issues were resolved instantly. It’s a classic failure pattern for these otherwise tough trucks.
Is Your Truck’s Electrical System Acting Up?
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. Addressing it now with a new 2002-2006 Avalanche 2500 BCM can prevent further diagnostic headaches.
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ HVAC blower motor or climate controls not working correctly.
- ✔ The security system preventing the engine from starting (no-crank condition).
- ✔ An airbag warning light that stays on, often with a DTC like B1001 (Option Configuration Error).
- ✔ Erratic interior or exterior lights (flickering, staying on, or not turning on).
- ✔ Wipers behaving erratically or not working at all.
- ✔ A cluster of seemingly unrelated body-related diagnostic trouble codes.
A 5-Minute Fix: Your BCM Installation Guide
One of the best features of our pre-programmed modules is the simple installation. You don’t need to be a master mechanic to get this job done. Just follow these steps:
- Safety First: Before you begin, disconnect the negative terminal on your vehicle’s battery. This prevents any electrical shorts and helps reset the vehicle’s systems.
- Locate the BCM: On most GM trucks from 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 Modules: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once unplugged, remove the old module (it’s typically held in by simple clips or a couple of small bolts).
- Install the New BCM: Snap the new module into place and securely re-attach all electrical connectors. You’ll hear a ‘click’ when they are properly seated.
- Reconnect and Test: Reconnect the negative battery terminal. Start the vehicle and test all the functions that were previously malfunctioning—windows, locks, HVAC, lights, etc.
Verified Compatibility for Your GM Truck or SUV
This module is a direct replacement for part number 15136877 and other interchangeable numbers. It is guaranteed to fit the following vehicles. Providing your VIN at checkout ensures we load the correct software for your specific options and a seamless installation of your 2002-2006 Avalanche 2500 BCM.
AVALANCHE 1500 03-06 Body Control (BCM); (under steering column)
CHEVROLET SILVERADO & GMC SIERRA 1500/2500/3500 (Classic) 03-07 Crew Cab
CHEVROLET SUBURBAN & GMC YUKON XL 1500/2500 03-06
CHEVROLET TAHOE & GMC YUKON 03-06
CADILLAC ESCALADE, ESV, EXT 03-06
HUMMER H2 03-07
CHEVROLET EXPRESS & GMC SAVANA VANS 04-07 (w/commercial tradesman pkg)
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s specific factory software and options onto the BCM before we ship it. This makes the module recognize your truck’s features (like power seats, specific lighting, security system, etc.) right out of the box, eliminating the need for a dealership to program it with their expensive tools.
Do I need to send my old BCM back? Is there a core charge?
No. We do not require a core return for this part. You can keep your old module, which saves you the time, cost, and hassle of shipping it back.
My airbag light is on. Will this fix it?
If the airbag light is caused by a BCM communication error (like DTC B1001), this module will resolve the root problem. However, after installation, a ‘Setup SDM Primary Key in BCM’ procedure may be required using a bi-directional scan tool to sync the new BCM with the airbag system and turn off the light. This is a common final step in the process.
What tools do I need for the installation?
For the physical swap, you typically only need a basic socket set or a screwdriver to disconnect the battery and potentially unbolt the module. No special programming tools are required. In some cases, a professional scan tool might be needed for post-install procedures like an airbag system sync or brake pedal position relearn, as noted in our documentation.
Is this part covered by a warranty?
Yes, this part comes with our standard one-year warranty, ensuring it provides reliable service and giving you confidence in your repair.