Tired of a Mind of Its Own? Restore Control to Your GM Truck or SUV
If you’re dealing with flickering lights, a security system that randomly acts up, power windows with a stubborn streak, or a radio that seems possessed, you’re not alone. As a technician with over two decades of experience, I’ve seen these exact issues countless times in early 2000s GM vehicles. The culprit is almost always a failing Body Control Module (BCM). This isn’t just an annoyance; it’s a breakdown in your vehicle’s central nervous system for all its comfort and convenience features. This replacement 2002 Sierra BCM is the definitive solution, arriving at your door pre-programmed and ready for a straightforward installation.
A Technician’s Notebook: The Case of the Haunted Silverado
A customer brought in his ’02 Silverado 2500 with a laundry list of bizarre electrical problems. The dome light would stay on, the horn would chirp randomly when locking the doors, and the driver’s power window only worked when it felt like it. He had already replaced the battery and checked all the fuses. After connecting my scan tool, I saw several communication error codes pointing toward the BCM. These modules are notorious for internal solder joint failures and component degradation over time. We swapped in a VIN-programmed BCM, and in under an hour, every single one of his electrical gremlins was gone. This isn’t just a part replacement; it’s restoring your vehicle’s sanity and your peace of mind.
Is Your GM Truck or SUV Showing These Signs?
A failing BCM can cause a wide range of confusing symptoms. If your vehicle is experiencing any of the following, a faulty Body Control Module is the most likely cause:
- ✔ Erratic or non-functional power windows and door locks.
- ✔ Interior or exterior lights flickering, staying on, or not working at all.
- ✔ The security or anti-theft light staying illuminated on the dash, possibly preventing the engine from starting.
- ✔ The radio or instrument cluster turning on and off intermittently.
- ✔ The horn sounding unexpectedly or not working when pressed.
- ✔ Communication-related Diagnostic Trouble Codes (DTCs) such as U-series codes (e.g., U0140, U0100).
- ✔ Problems with the HVAC (heating and air conditioning) controls.
Your Straightforward Installation Guide
One of the biggest benefits of this module is that it arrives programmed to your vehicle’s VIN. This eliminates the need for an expensive trip to the dealership for programming. While installation is straightforward, always prioritize safety. For most trucks and SUVs, the BCM is located under the driver’s side of the dashboard. On vans like the Astro and Safari, it’s often behind the center dash panel.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the system to fully discharge.
- Locate the BCM: Find the existing Body Control Module. It’s a plastic box with several large multi-pin electrical connectors.
- Disconnect and Remove: Carefully unplug all electrical connectors. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the old BCM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed BCM in the same location. Securely plug in all the electrical connectors, making sure they click into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all body functions: lights, locks, windows, radio, etc.
Important Post-Installation Notes
After installing your new 2002 Sierra BCM, a couple of additional steps, known as relearn procedures, may be necessary. This is normal and ensures all related vehicle systems communicate correctly with the new module.
- Airbag System Sync: If your 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 airbag system with the new BCM.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be required to ensure your brake lights and traction control system function correctly.
We offer a simple ‘No Core Charge’ policy, so you can keep your old part.
Verified Fitment for Your Vehicle
This Body Control Module is a direct replacement for a wide range of GM trucks, vans, and SUVs. Please verify your original part number matches one of the following: 15063578, 15081796, 15095334, 19208537, DKAK, or DPNU. It is confirmed to fit the following models:
- GMC Sierra 1500, 2500, 3500 & Denali: 2002
- Chevrolet Silverado 1500, 2500, 3500: 2002
- Chevrolet Avalanche 1500 (4×2): 2002
- Chevrolet Tahoe (4×2): 2002
- Chevrolet Suburban 1500 (4×2), 2500: 2002
- GMC Yukon (4×2): 2002
- GMC Yukon XL 1500 (4×2), 2500: 2002
- Cadillac Escalade (4×2): 2002
- Chevrolet Blazer S10 / GMC Jimmy S15: 2002-2005
- Chevrolet S10 / GMC Sonoma: 2002-2004
- Chevrolet Astro Van: 2002-2005
- GMC Safari Van: 2002-2005
Why is this BCM programmed to my VIN?
We program the module to your specific Vehicle Identification Number (VIN) before shipping. This loads all the correct software and vehicle-specific options, ensuring it works seamlessly with your truck’s features right out of the box and saving you a costly trip to the dealership for programming.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship the part until we receive this information to perform the programming service.
Is this a difficult part for a DIYer to install?
For someone with basic mechanical skills, this is a very manageable job. The main challenge is typically accessing the module under the dashboard. Since our 2002 Sierra BCM comes pre-programmed, you avoid the most complex part of the process. Just swap the part and you’re nearly done.
What happens if my airbag light turns on after installation?
This is an occasional and normal security measure. The BCM and the airbag module (SDM) need to be electronically re-synced. This procedure, called ‘Setup SDM Primary Key in BCM’, must be done with a professional-grade scan tool. A local repair shop can typically perform this for you.
Do I need to send my old BCM back?
No. We have a ‘no core charge’ policy. You can keep, discard, or recycle your original module at your convenience.
How can I be sure this fits my truck?
The best way is to match the part number on your original BCM to one of the numbers listed: 15063578, 15081796, 15095334, 19208537, DKAK, or DPNU. You can also use the detailed fitment list provided above to confirm your make, model, and year.