GM Body Control Module 15872421 | Programmed to Your VIN

Tired of Chasing Electrical Gremlins in Your GM Vehicle?

As a technician with over two decades of experience, I’ve seen it all. Flickering dashboard lights, power windows with a mind of their own, a security system that won’t let you start your own car—these aren’t just annoyances; they’re classic signs of a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it starts to go, it can create a cascade of baffling and frustrating problems. Don’t replace random switches and sensors. The root cause is often this central computer.

This isn’t just a replacement part; it’s a complete solution. We take a genuine OEM-quality GM Body Control Module and flash it with the latest official GM software, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This means you can skip the expensive trip to the dealership and the hassle of finding a shop with the right programming tools. We do the complex part for you, so you get a module that’s ready for installation right out of the box.

Is Your Vehicle Showing These BCM Failure Signs?

A faulty BCM can manifest in many ways. If you’re experiencing several of the following, there’s a strong chance your BCM is the culprit:

• ✔ Erratic or non-functional power windows, door locks, or mirrors.
• ✔ Interior or exterior lights that flicker, stay on, or don’t work at all.
• ✔ The security system acting up, causing no-start conditions or false alarms.
• ✔ The horn honking randomly or not working when pressed.
• ✔ Warning lights on the dashboard (like the airbag light) that won’t turn off.
• ✔ Intermittent issues with the radio or climate control systems.
• ✔ Communication error codes (U-codes) stored when scanned.

A Straightforward Guide to BCM Installation

Replacing the BCM is a manageable job for a DIYer with basic tools. While the exact location varies by model (see the fitment list), the process is generally similar.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
2. Locate the BCM: On most of these vehicles, it’s located under the driver’s side or center of the dashboard. You may need to remove a lower dash panel for access.
3. Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once unplugged, unbolt or unclip the old BCM and remove it from the vehicle.
4. Install the New Module: Mount your new, pre-programmed BCM in the same location and securely plug in all the electrical connectors. You should hear a ‘click’ as they lock into place.
5. Reconnect Power: Re-attach the negative battery terminal.
6. Post-Installation Procedures: This is a critical step. Turn the key to the ‘ON’ position. You may need to perform a security relearn procedure (often involves cycling the key). As noted, for full functionality and safety, a ‘Setup SDM Primary Key in BCM’ procedure is required to clear the airbag light, and a brake pedal position sensor calibration may be needed. These final steps require a bi-directional scan tool.

Verified Vehicle Compatibility List

This module is a direct replacement for a wide range of GM cars, trucks, and SUVs. Please match your vehicle from the list below. This part replaces numerous original part numbers, including 10382479, 15872388, 20815898, 22860591, 25892622, and many more.

Note: Some models have specific IDs or engine options. Please verify with the detailed list provided in the original data or contact us with your VIN if you are unsure.