Are you chasing down electrical gremlins in your GM truck, van, or SUV? One day the power windows work, the next they don’t. Maybe the security light is flashing and the engine won’t crank, or the interior lights have a mind of their own. As a technician with over two decades of experience under the hood, I’ve seen these exact issues hundreds of times, and they almost always point to a failing Body Control Module (BCM). This isn’t just an inconvenience; it can leave you stranded. This module is the central nervous system for your vehicle’s comfort and convenience features, and when it fails, chaos ensues.
We offer a straightforward, reliable solution. This is a direct-fit replacement Body Control Module, compatible with part number 15063578 and other interchangeable numbers listed below. The best part? We handle the programming for you. Simply provide your vehicle’s VIN during checkout, and our experts will flash the module with the latest GM-certified software specific to your truck or SUV. This means no expensive trip to the dealer, no special tools, and no programming headaches. It arrives at your door ready for installation, designed to restore full functionality and get you back on the road with confidence.
From the Diagnostic Bay: The Case of the 2002 Silverado
I remember a customer bringing in his ’02 Silverado 1500. The complaint was classic BCM failure: intermittent no-start, the radio would stay on after he took the key out, and the power locks worked only when they felt like it. He’d already replaced the battery and checked fuses, getting more frustrated by the day. After plugging in my scan tool, I saw a slew of ‘U’ codes, indicating a loss of communication between modules. This is a dead giveaway. The original BCM, located under the steering column, had signs of internal corrosion, a common issue. We installed a VIN-programmed BCM, and within an hour, every single electrical issue was gone. It’s a repair that provides immense satisfaction because it solves so many problems at once.
Is Your GM Vehicle Showing These BCM Failure Signs?
A failing BCM can manifest in many ways. If you’re experiencing any of the following, there’s a strong chance your BCM is the culprit. This is especially true if the problems are intermittent.
- ✔ Power windows, door locks, or mirrors operate erratically or not at all.
- ✔ The anti-theft or security light stays on, preventing the engine from starting.
- ✔ Interior dome lights or dashboard lights flicker, stay on, or won’t turn on.
- ✔ The horn honks randomly or doesn’t work.
- ✔ Wipers activate on their own or won’t shut off.
- ✔ Communication Diagnostic Trouble Codes (DTCs) like U0140, U0155, or other U-series codes are present.
- ✔ The radio or other accessories stay powered on after the key is removed, draining the battery.
Your Straightforward BCM Installation Guide
Installing your new 2002-2004 GM BCM is a manageable job for a DIYer with basic tools. While locations vary slightly (center dash for vans, under the steering column for trucks/SUVs), the process is generally similar.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the BCM: On most trucks and SUVs (Silverado, Sierra, Tahoe, etc.), it’s under the driver’s side of the dashboard, near the steering column. On vans (Astro, Safari), it’s typically behind the center dash panel.
- Remove Trim Panels: Carefully remove any plastic trim or panels necessary to access the module. These usually pop off or are held by a few screws.
- Unplug and Unbolt: Disconnect the multiple wiring harnesses from the old BCM. They have release tabs that need to be pressed. Then, unbolt the module from its mounting bracket.
- Install the New BCM: Bolt your new, pre-programmed BCM into place. Securely reconnect all the wiring harnesses, ensuring each one clicks firmly into place.
- Reconnect and Test: Reinstall any trim panels you removed. Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: windows, locks, lights, wipers, etc.
Important Post-Installation Notes
In some cases, your vehicle may require a simple relearn procedure after the new BCM is installed. This is normal and ensures all systems communicate correctly.
- 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 new BCM with the airbag module.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be necessary for proper brake light and traction control operation.
Verified Fitment for Your Truck, Van, or SUV
This module is a direct replacement for part numbers 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU. Please verify your part number or use the compatibility list below. Providing your VIN is essential for correct programming.
ASTRO 02-05 (center dash)
BLAZER S10/JIMMY S15 02-05 (center dash)
ESCALADE 02 (under steering column), 4×2
S10/S15/SONOMA 02-04 (center dash)
SAFARI (GMC) 02-05 (center dash)
SIERRA 1500 PICKUP 02 (under steering column)
SIERRA 2500 PICKUP 02 (under steering column)
SIERRA 3500 PICKUP 02 (under steering column)
SIERRA DENALI 02 (under steering column)
SILVERADO 1500 PICKUP 02 (under steering column)
SILVERADO 2500 PICKUP 02 (under steering column)
SILVERADO 3500 PICKUP 02 (under steering column)
SUBURBAN 1500 02 (under steering column), 4×2
SUBURBAN 2500 02 (under steering column)
TAHOE 02 (under steering column), 4×2
YUKON 02 (under steering column), 4×2
YUKON XL 1500 02 (under steering column), 4×2
YUKON XL 2500 02 (under steering column)
Frequently Asked Questions
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.
What does ‘programmed to my VIN’ mean?
It means we load the module with the specific software and settings for your vehicle’s exact configuration (engine, transmission, options) based on its Vehicle Identification Number. This ensures it works correctly right out of the box.
How do I find my original part number?
The part number is printed on a sticker on the original BCM itself. You will need to access the module in your vehicle to read it.
Will this fix my ‘Service 4WD’ light?
In many cases, yes. The BCM communicates with the transfer case control module. A faulty BCM can disrupt this communication and trigger a false ‘Service 4WD’ warning. Replacing a bad 2002-2004 GM BCM often resolves this issue.
What if the airbag light comes on after I install it?
This is an occasional possibility and requires a professional scan tool to perform a quick ‘Setup SDM Primary Key’ procedure to sync the airbag system to the new BCM. This is a standard procedure for many module replacements.