2003-2006 Avalanche 1500 BCM 15136877 VIN Programmed for Easy Install

Tired of Chasing Electrical Gremlins in Your Truck?

If your 2003-2006 Chevrolet Avalanche 1500 is acting possessed—with flickering lights, a dead instrument cluster, a temperamental HVAC system, or power windows with a mind of their own—you’re not alone. As a technician with over two decades of experience, I’ve seen these exact issues countless times. The culprit is almost always a failing Body Control Module (BCM). This small computer is the central hub for your truck’s body electronics, and when it starts to fail, it creates a cascade of frustrating and unpredictable problems. Don’t waste another weekend tracing wires or throwing parts at the problem. This is the definitive, reliable fix you’ve been looking for.

This replacement BCM, part number 15136877, arrives at your door pre-programmed to your truck’s specific Vehicle Identification Number (VIN). This is the most critical feature. It means you can skip the expensive trip to the dealership for programming. You get a true plug-and-play solution that restores factory functionality right out of the box. We handle the complex part so you can handle the simple installation and get your Avalanche back to being the reliable workhorse it was meant to be.

Is Your Avalanche Showing These Signs?

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:

• ✔ Intermittent or non-functional power windows, door locks, or mirrors.
• ✔ HVAC controls not responding or the blower motor working erratically.
• ✔ The security system acting up, causing a no-start condition or false alarms.
• ✔ An airbag light that won’t turn off, often with a DTC like B1001 stored.
• ✔ Headlights, taillights, or interior lights flickering or not working at all.
• ✔ A wide range of communication (U-codes) or body-related (B-codes) diagnostic trouble codes.

A Straightforward Guide to Your 2003-2006 Avalanche 1500 BCM Installation

One of the best parts about this solution is its simplicity. You don’t need a lift or specialized tools. For most DIYers, this is a 10-minute job.

1. Safety First: Always disconnect the negative terminal on your truck’s battery before starting any electrical work. This prevents shorts and helps reset the vehicle’s systems.
2. Locate the BCM: In your 2003-2006 Avalanche, the BCM is located under the driver’s side of the dashboard, near the steering column. It’s a black plastic box with several large multi-pin connectors.
3. Remove the Old Module: Carefully unplug the electrical connectors. They have locking tabs that need to be pressed to release. Once unplugged, unclip or unbolt the module from its mounting bracket.
4. Install the New Module: Seat your new, pre-programmed BCM into the mounting bracket and securely plug in all the electrical connectors. You’ll hear a click as they lock into place.
5. Reconnect and Test: Reconnect your battery terminal. Turn the key to the ‘On’ position and test all the functions that were previously malfunctioning—windows, locks, lights, and HVAC.
6. Post-Install Checks: In some cases, a procedure like an ‘SDM Key Relearn’ may be needed if the airbag light appears. This requires a professional scan tool but is not always necessary. See our FAQ for more details.

Verified Vehicle Compatibility

This module is a direct replacement for part number 15136877 and other interchangeable numbers. While this page focuses on the Avalanche, it is guaranteed to fit the following models. Please verify your vehicle and options below.