GM Body Control Module 15872421 | VIN Programmed for Your Vehicle

End the Electrical Gremlins in Your GM Vehicle

As a technician with over two decades of experience, I’ve seen it all. A customer comes in, completely frustrated, describing a vehicle that seems possessed. The dome lights flicker randomly, the power windows have a mind of their own, the radio turns on and off, and the dreaded “Service Theft System” message is lit up on the dash. These aren’t separate problems; they’re classic symptoms of a failing Body Control Module (BCM). The BCM is the central nervous system for your car’s comfort and security features, and when it starts to fail, it creates a cascade of confusing and annoying issues.

Don’t let a faulty module take your vehicle off the road or force you into an expensive dealership visit. This GM Body Control Module is the definitive solution, arriving at your doorstep 100% pre-programmed for your specific vehicle. All we need is your VIN during checkout. We handle the complex part—flashing the unit with the latest, most stable software from GM—so you can focus on the simple installation. This isn’t just a replacement part; it’s a permanent fix that restores the reliability you depend on every day.

Common Signs of a Failing BCM

If your vehicle is exhibiting any of these symptoms, a failing BCM is the most likely cause. Replacing it can resolve multiple issues at once.

• ✔ Erratic or non-functional power windows, door locks, and mirrors.
• ✔ Interior or exterior lights that flicker, stay on, or don’t work at all.
• ✔ The security or anti-theft system light is on, or the vehicle won’t start.
• ✔ Horn honking unexpectedly or not working when pressed.
• ✔ Inaccurate or dead gauges on the instrument cluster.
• ✔ Key fob not responding correctly.

Your Straightforward BCM Installation Guide

Installing your new GM Body Control Module is a manageable job for a DIY enthusiast. While the location varies slightly by model, the process is generally the same.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
2. Locate the BCM: On most of these vehicles, the BCM is located inside the cabin, typically under the driver’s side or passenger’s side of the dashboard, or behind the center console. A quick search for your specific model will confirm its position.
3. Remove Trim Panels: You may need to remove a few plastic trim panels to gain access to the module. These are usually held in with clips or a few small screws.
4. Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt the module from its mounting bracket.
5. Install the New Module: Bolt the new, pre-programmed BCM into place. Securely plug in all the electrical connectors, ensuring each one clicks into place.
6. Final Steps & Re-assembly: Re-install any trim panels you removed and reconnect the negative battery terminal.

Important Post-Installation Procedures

After your new BCM is installed, a couple of quick procedures are necessary to ensure all systems are communicating correctly. This is a critical step for safety and full functionality.

• Airbag System Reset: The airbag warning light will likely be on. You must perform the ‘Setup SDM Primary Key in BCM’ procedure with a compatible high-end scan tool to re-establish the link between the BCM and the airbag system. This ensures the safety system is active.
• Brake Pedal Position Sensor Relearn: Some vehicles may require a brake pedal position sensor relearn. This procedure recalibrates the sensor to the new module, which is vital for proper brake light operation and stability control functions.

Verified Fitment For These GM Vehicles

This module is a direct replacement for a wide range of original part numbers, including 15872421, 25892622, 20815898, and many more. It is guaranteed to fit the following models:

Note: For some 2010 SUV models, please verify the ID on your original module to ensure compatibility.