Programmed GM Body Control Module 15872421 | VIN Matched & Ready to Install

Restore Your Vehicle’s Electrical System with a Plug-and-Play Solution

Are you dealing with baffling electrical issues in your GM vehicle? Flickering dashboard lights, power windows with a mind of their own, or a security system that prevents your car from starting are classic signs of a failing Body Control Module (BCM). As the central hub for your vehicle’s body electronics, a faulty BCM can cause a cascade of frustrating and seemingly unrelated problems. This isn’t just an annoyance; it can affect safety systems like your brake lights and security features. This replacement GM Body Control Module is the reliable, straightforward fix you need to get your car, truck, or SUV back to normal.

We take the guesswork and high dealership costs out of the equation. Unlike a standard replacement part that requires expensive programming tools, this module arrives at your door pre-programmed with the latest GM software, specifically matched to your vehicle’s VIN. This means for many installations, it’s a direct swap. You provide your VIN, we handle the complex programming, and you get a part that’s ready to install right out of the box.

Is Your GM Vehicle Exhibiting These Strange Behaviors?

A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, your BCM is the most likely culprit:

• ✔ Erratic or non-functional interior and exterior lights (headlights, dome lights, dash lights).
• ✔ Power windows, door locks, or remote keyless entry working intermittently or not at all.
• ✔ The security or anti-theft system preventing the engine from starting (Security light on).
• ✔ False warnings on the instrument cluster (e.g., Door Ajar, Service Airbag).
• ✔ Communication-related Diagnostic Trouble Codes (DTCs), such as U0140, U0155, or U0100.
• ✔ Battery drain when the vehicle is turned off, caused by the BCM failing to go into ‘sleep’ mode.

Your Straightforward BCM Installation Guide

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

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes to allow all systems to power down completely.
2. Locate the BCM: Depending on your model, the BCM is typically found under the driver’s side dash, behind the glove box, or in the center console area. You may need to remove a few plastic trim panels for access.
3. Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be pressed to release. Once disconnected, unbolt or unclip the module from its mounting bracket.
4. Install the New Module: Mount your new, pre-programmed BCM in the same location. Securely plug in all electrical connectors, ensuring each one clicks firmly into place.
5. Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position (without starting the engine) and test all body functions: lights, locks, windows, radio, etc.
6. Perform Relearns (If Needed): Start the vehicle. If you see an airbag light or notice brake light issues, you may need to perform the post-installation procedures detailed below with a compatible scan tool.

Important Post-Installation Information

While our VIN programming handles the majority of the setup, some vehicle systems may require a quick sync after installation:

• ✔ Airbag System Sync: If the airbag warning light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system.
• ✔ Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be necessary to ensure correct operation of the brake lights and traction control system.
• ✔ No Core Charge: You are not required to return your old BCM. There is no core charge or deposit associated with this purchase.

Disclaimer: Vehicle systems vary. Always consult a factory service manual or a qualified professional if you are unsure about any step.

Verified Fitment For a Wide Range of GM Models

This GM Body Control Module is a direct replacement for a vast array of vehicles and part numbers, ensuring you get the right component. It is compatible with part numbers 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, and many more. Please see the detailed list below.