End the Electrical Chaos in Your GM Truck or SUV
Are you chasing electrical gremlins in your 2002 GMC Sierra? Flickering lights, power windows with a mind of their own, a security light that won’t turn off, or a frustrating no-start condition can all point to one culprit: a failing Body Control Module (BCM). As the central command for your vehicle’s body electronics, a faulty BCM can cause widespread and confusing issues. This replacement Body Control Module is the reliable, straightforward solution to restore order and get your vehicle’s features working correctly again.
We take the guesswork and hassle out of the repair. Simply provide your vehicle’s VIN during checkout, and our technicians will program this module with the latest GM-certified software specifically for your truck. It arrives at your door ready for installation, saving you a trip to the dealership and the high costs associated with programming. Plus, with our no-core-charge policy, you can keep your old part without any extra fees.
A Technician’s Notebook: The Intermittent No-Start
I had a 2002 Silverado in the bay that was driving the owner crazy. It would start fine for a week, then suddenly refuse to crank, only to start perfectly an hour later. The battery was new, the starter tested fine. After checking the basics, I hooked up my professional scanner and saw communication loss codes with the BCM. The BCM controls the Passlock security system. When it fails intermittently, it won’t send the ‘all clear’ signal to the PCM, resulting in a no-crank situation. Swapping in a properly programmed BCM fixed it instantly. These symptoms are classic signs of internal BCM failure.
Is Your GM Vehicle Showing These Symptoms?
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔ The security or anti-theft light stays on, preventing the engine from starting.
- ✔ Gauges on the instrument cluster behaving erratically or not working.
- ✔ Unexplained battery drain that kills your battery overnight.
- ✔ Diagnostic Trouble Codes (DTCs) related to communication errors, such as U-codes (e.g., U0140, U0155).
- ✔ Horn honking unexpectedly or not working when pressed.
Your Straightforward BCM Installation Guide
Installing your new 2002 Sierra Body Control Module is a manageable job for a confident DIYer. While the exact location can vary slightly, the process is generally consistent for the trucks and SUVs listed.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before beginning work.
- Locate the BCM: On most trucks and full-size SUVs like the Sierra, Silverado, and Tahoe, the BCM is located under the driver’s side of the dashboard, often near the steering column. On vans like the Astro and Safari, it’s typically behind the center dash panel.
- Remove Connectors: Carefully unplug all electrical connectors from the old BCM. They have locking tabs that need to be depressed to release them. Do not force them.
- Swap the Module: Unbolt or unclip the old BCM from its mounting bracket and remove it. Place the new, pre-programmed module in the same position.
- Reconnect Everything: Securely plug all electrical connectors into the new BCM. You should hear a ‘click’ as they lock into place. Reconnect the negative battery terminal.
- Test Functionality: Turn the key to the ‘On’ position and test your lights, locks, windows, and other accessories to ensure they are working correctly.
Important Post-Installation Steps
After installation, your vehicle should start and run. However, depending on your specific model and options, a couple of additional steps, known as relearn procedures, might be necessary. These require a bi-directional scan tool that most professional shops have.
- Airbag System Sync: If your airbag warning light is on after the swap, a procedure called ‘Setup SDM Primary Key in BCM’ is needed to sync the new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be required to ensure your brake lights and traction control system function properly.
Verified Fitment for These GM Vehicles
This module is a direct replacement for part numbers 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU. It is compatible with the following vehicles:
- Chevrolet Avalanche 1500: 2002 (4×2)
- Chevrolet Blazer S10: 2002-2005
- Chevrolet S10 Pickup: 2002-2004
- Chevrolet Silverado 1500/2500/3500 Pickup: 2002
- Chevrolet Suburban 1500/2500: 2002 (4×2 for 1500)
- Chevrolet Tahoe: 2002 (4×2)
- Chevrolet Astro Van: 2002-2005
- Cadillac Escalade: 2002 (4×2)
- GMC Jimmy S15: 2002-2005
- GMC Sonoma S15: 2002-2004
- GMC Sierra 1500/2500/3500/Denali Pickup: 2002
- GMC Yukon & Yukon XL 1500/2500: 2002 (4×2 for Yukon/XL 1500)
- GMC Safari Van: 2002-2005
Frequently Asked Questions
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you will need to provide us with your 17-digit Vehicle Identification Number (VIN). Our technicians use this to load the correct, vehicle-specific GM software and calibrations onto the BCM before it ships. This ensures it communicates properly with your vehicle’s other modules.
Do I need to return my old BCM?
No. This product comes with no core charge. You can keep your original module, which can be helpful for reference or as a backup.
Why is my airbag light on after installation?
The BCM and the airbag module (SDM) are linked for security. When you replace the BCM, this link can be broken. A professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure to re-establish the connection and turn off the light.
Can I install this myself?
Yes, the physical installation is a simple plug-and-play process for anyone comfortable with basic auto repair. However, be aware that post-installation relearn procedures for the airbag or brake systems may be necessary and require a professional-grade scan tool.
Is this a guaranteed fix for my problem?
This BCM will fix issues caused by a faulty module. While the symptoms listed are very common for BCM failure, we always recommend proper diagnosis by a qualified technician to confirm the BCM is the root cause before ordering.