Tired of Bizarre Electrical Problems in Your GM Truck or Van?
If your 2002-2005 GM vehicle is acting possessed—with flickering lights, a battery that dies overnight, or power accessories that have a mind of their own—you’re not alone. As a technician with over 20 years of experience, I’ve seen these exact issues hundreds of times. The culprit is almost always a failing Body Control Module (BCM). This isn’t just an annoyance; a faulty BCM can leave you stranded. This module is the central hub for your vehicle’s body electronics, and when it fails, it creates a cascade of frustrating and unpredictable problems.
We offer a reliable and straightforward solution: a professionally serviced Body Control Module, programmed with the latest GM software specifically for your vehicle’s VIN. This isn’t just a part; it’s a permanent fix that restores your vehicle’s functionality and your peace of mind. By providing your VIN at checkout, you receive a true plug-and-play GM BCM Replacement, eliminating the need for an expensive trip to the dealership for programming.
A Technician’s Notebook: The Phantom Battery Drain
A customer brought in his 2002 Silverado 1500, completely frustrated. He’d replaced the battery twice and the alternator once, but every few days, he’d find the truck dead in his driveway. His power locks would also work intermittently. After hooking up my multimeter for a parasitic draw test, I saw a significant amp draw that wouldn’t go away. By pulling fuses one by one, we isolated the circuit to the BCM. The internal relays were sticking, keeping modules powered on long after the key was off. Installing a pre-programmed BCM like this one solved the draw instantly. It’s a classic failure mode for these vehicles.
Is Your GM Vehicle Showing These Symptoms?
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ Interior dome lights or dashboard lights flickering or staying on.
- ✔ Unexplained battery drain that leaves you with a dead battery.
- ✔ The security or anti-theft system acting up, preventing the vehicle from starting.
- ✔ Horn honking randomly or not working at all.
- ✔ Inaccurate fuel gauge readings or other instrument cluster problems.
Your Straightforward BCM Installation Guide
Replacing the BCM is a manageable job for a DIYer with basic tools. The most important part of this GM BCM Replacement is the post-installation procedures. Follow these steps carefully.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On most trucks (Silverado, Sierra, Tahoe), it’s under the driver’s side of the dashboard, near the steering column. On vans (Astro, Safari) and S10/Blazer models, it’s typically located in the center dash area.
- Remove Trim Panels: You may need to remove the lower dash panel or other trim pieces to gain access. Keep your screws organized.
- 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.
- Install the New BCM: Mount your new, pre-programmed BCM and securely plug in all the connectors. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- CRITICAL – Post-Install Procedures: After installation, you MUST perform the ‘Setup SDM Primary Key in BCM’ procedure with a compatible high-end scan tool to clear the airbag light. Some vehicles may also require a brake pedal position sensor calibration. Failure to do these steps will result in warning lights and potential safety system issues.
Verified Fitment for Your GM Truck or Van
This module is a direct-fit replacement for a wide range of GM vehicles. Please match your original part number or use the fitment list below to confirm compatibility. This unit replaces part numbers: 15063578, 15081796, 15095334, 19208537, DKAK, DPNU.
- Chevrolet Avalanche 1500 (4×2): 2002
- Chevrolet Blazer S10 / GMC Jimmy S15: 2002-2005
- Chevrolet S10 / GMC Sonoma: 2002-2004
- Chevrolet Silverado & GMC Sierra 1500/2500/3500 & Denali: 2002
- Chevrolet Suburban & GMC Yukon XL 1500/2500: 2002
- Chevrolet Tahoe & GMC Yukon (4×2): 2002
- Cadillac Escalade (4×2): 2002
- Chevrolet Astro & GMC Safari Van: 2002-2005
Frequently Asked Questions About This GM BCM Replacement
Do I need to do any programming myself?
No. We handle all the programming before shipment. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the latest GM software for your specific vehicle. It arrives ready to install.
What tools are required for the post-installation procedures?
You will need a professional-grade diagnostic scan tool (like a Snap-on, Autel, or GM Tech 2) that can perform security and body control functions. The ‘Setup SDM Primary Key in BCM’ and ‘Brake Pedal Position Sensor Learn’ procedures cannot be done with basic code readers.
Will this fix my ‘Service 4WD’ light?
While the BCM communicates with many systems, a ‘Service 4WD’ light is more commonly caused by the Transfer Case Control Module (TCCM) or the encoder motor/sensor on the transfer case. It’s best to diagnose that issue separately.
Is this a new or used part?
This is a high-quality, expertly serviced original GM part that has been tested, cleared, and loaded with vehicle-specific software. This ensures OEM-level reliability and perfect compatibility, which is often superior to aftermarket alternatives.
Where do I find the part number on my old BCM?
The part number is printed on a white sticker on the case of the module itself. You will need to remove the module from the vehicle to see it clearly. Matching the part number is the best way to ensure you’re ordering the correct component.