Restore Your Truck’s Electrical System with a Plug-and-Play Solution
Are you chasing down frustrating electrical gremlins in your 2002 GMC Sierra or other GM truck? Intermittent power windows, flickering dash lights, malfunctioning door locks, or a security light that won’t turn off are classic signs of a failing Body Control Module (BCM). As the central command center for your vehicle’s body electronics, a faulty BCM can cause a cascade of confusing problems. This isn’t just an annoyance; it can affect vehicle security and drivability. This module is your direct-fit, reliable solution to get your truck’s features working correctly again.
We take the guesswork and dealer hassle out of the repair. Unlike a generic part from a local store, this BCM arrives at your door pre-programmed with the latest GM software, specifically matched to your vehicle’s VIN. This means no expensive trip to the dealership for programming—a step that can often cost hundreds of dollars and add days to your repair time. Simply provide your VIN after purchase, and our experts will handle the flashing. It’s the most efficient way to replace your 2002 Sierra BCM and restore full functionality.
From the Diagnostic Bay
I remember a 2002 Silverado that came into the shop with a laundry list of bizarre symptoms. The owner said the radio would turn on by itself, the driver’s side power lock worked but the passenger’s didn’t, and the dome light would stay on, draining the battery. He’d already replaced the battery and checked fuses. After hooking up the scan tool, I saw a dozen communication loss codes (U-codes) pointing to the BCM. These modules, especially on the GMT800 platform, are notorious for internal solder joint failures over time. We installed a VIN-programmed BCM just like this one, and every single issue vanished instantly. It’s a textbook fix for what seems like a hopelessly complex electrical problem.
Is Your Truck Showing These Symptoms?
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or don’t work at all.
- ✔ The security or anti-theft light is illuminated, potentially causing a no-start condition.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Diagnostic Trouble Codes (DTCs) related to communication loss, such as U0140, U0155, or U0164.
- ✔ Wipers activating on their own or not responding to the switch.
A Straightforward Guide to BCM Installation
Installing your new 2002 Sierra BCM is a manageable job for a DIYer with basic tools. While the exact location can vary, it’s typically found under the driver’s side of the dashboard, near the steering column.
- 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.
- Locate the BCM: On most 2002 GM trucks like the Sierra and Silverado, the BCM is mounted to a bracket under the steering column. You may need to remove a lower dash panel for access.
- Disconnect and Remove: Carefully unplug the multiple color-coded 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. Reconnect all the electrical connectors, ensuring each one clicks securely into place. They are color-coded to prevent mix-ups.
- Reconnect and Test: Reattach the negative battery terminal. Turn the key to the ‘On’ position and test all body functions: lights, locks, windows, wipers, and horn.
Important Post-Installation Notes
In some cases, additional steps may be required after installation. If your airbag light comes on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the modules. Additionally, a ‘Brake Pedal Position Relearn’ may be necessary on certain models to ensure proper brake light and traction control operation. As always, consulting a factory service manual for your specific vehicle is recommended.
Guaranteed Fitment for Your GM Vehicle
This Body Control Module is a direct replacement for part numbers 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU. It is confirmed to fit a wide range of GM models, including:
- GMC Sierra / Chevrolet Silverado (1500, 2500, 3500): 2002
- GMC Yukon / Chevrolet Tahoe: 2002 (4×2 models)
- GMC Yukon XL / Chevrolet Suburban (1500, 2500): 2002
- Chevrolet Avalanche 1500: 2002 (4×2 models)
- Cadillac Escalade: 2002 (4×2 models)
- Chevrolet Blazer S10 / GMC Jimmy S15: 2002-2005
- Chevrolet S10 / GMC Sonoma: 2002-2004
- Chevrolet Astro / GMC Safari: 2002-2005
This is a hassle-free purchase with no core charge. You can keep your old module without worrying about returns or extra fees.
Frequently Asked Questions
2002 Sierra BCM
Will this fix my ‘Service 4WD’ light?
While the BCM communicates with many systems, a ‘Service 4WD’ message is more commonly related to the Transfer Case Control Module (TCCM) or the encoder motor. This primarily controls body functions like lights, locks, and windows.