Tired of Electrical Gremlins in Your GM Truck?
As a technician with over two decades of experience, I’ve seen it all when it comes to vehicle electronics. If your 2002 GMC Sierra or a similar GM vehicle is acting possessed—with flickering lights, malfunctioning power windows or locks, a dead radio, or a security light that won’t turn off—the culprit is very often a failing Body Control Module (BCM). This isn’t just an annoyance; it can affect vehicle security and safety systems. The BCM is the central nervous system for your vehicle’s comfort and convenience features, and when it goes, it can cause a cascade of frustrating, seemingly unrelated problems.
This isn’t just a replacement part; it’s a complete solution. We take the hassle and high cost of dealership repairs out of the equation. Simply provide us with your vehicle’s VIN after purchase, and our experts will program this BCM with the latest official GM software specific to your truck. It arrives at your door ready to install, restoring full functionality without the need for an expensive trip to the dealer for programming. This is the most reliable and efficient way to get your truck back to normal.
A Technician’s Notebook
I remember a 2002 Silverado that came into my bay with a truly baffling set of symptoms. The owner said his battery would die overnight, the dome light had a mind of its own, and the power door locks worked intermittently. He had already replaced the battery and alternator. After checking for parasitic draws, I hooked up my professional scan tool and found a series of communication errors pointing to the BCM (codes like U0140). The internal circuits were failing, keeping other modules awake and draining the battery. We installed a VIN-programmed BCM just like this one, and it solved every single issue instantly. It’s a classic failure on these otherwise tough trucks.
Is Your GM Vehicle Showing These Symptoms?
A failing BCM can manifest in many ways. If you’re noticing any of the following, it’s a strong indicator that your Body Control Module needs attention:
- ✔ Power windows, mirrors, or door locks not working or acting erratically.
- ✔ Interior or exterior lights staying on, not turning on, or flickering.
- ✔ The security or anti-theft system light is on, preventing the engine from starting.
- ✔ The radio or instrument cluster powers on and off randomly.
- ✔ Wipers behaving unpredictably or not parking in the correct position.
- ✔ Communication Diagnostic Trouble Codes (DTCs) are present, such as U0140, U0155, or B-series codes related to body electronics.
Your Straightforward BCM Installation Guide
For most DIYers with basic tools, this is a manageable job. The location can vary, so confirm if your BCM is under the steering column or in the center dash area before you begin.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- Locate the BCM: On most Sierra, Silverado, and other GM trucks, it’s located under the driver’s side dashboard, near the steering column. On vans like the Astro or Safari, it’s often behind the center dash panel.
- Remove Trim Panels: Carefully remove any plastic trim or panels necessary to access the module. Keep track of your screws and clips.
- Disconnect and Remove: The BCM will have several multi-pin electrical connectors. Carefully depress the locking tabs on each connector and pull them straight out. Do not force them. Once disconnected, unbolt or unclip the old module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in the exact same position as the old one. Reconnect all electrical connectors, making sure each one clicks securely into place.
- Final Steps: Reinstall any trim panels you removed. Reconnect the negative battery terminal. Start the vehicle and test all functions—lights, windows, locks, radio, etc.—to confirm the repair.
Important Post-Installation Information
While this BCM is programmed to be as plug-and-play as possible, some vehicle systems may require a final handshake. If your airbag light is on after installation, a professional scan tool is needed for the “Setup SDM Primary Key in BCM” procedure. Similarly, some models may require a Brake Pedal Position sensor relearn. These are standard procedures for any professional shop. Always consult a factory service manual for vehicle-specific details.
Verified Compatibility for Your Vehicle
This Body Control Module is a direct replacement for part numbers 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU. It is guaranteed to fit the following GM models and years:
- GMC Sierra 1500, 2500, 3500 & Denali (2002)
- Chevrolet Silverado 1500, 2500, 3500 (2002)
- Chevrolet Avalanche 1500 (2002, 4×2)
- Cadillac Escalade (2002, 4×2)
- Chevrolet Tahoe (2002, 4×2)
- GMC Yukon & Yukon XL 1500 (2002, 4×2)
- Chevrolet Suburban 1500 (2002, 4×2)
- GMC Yukon XL 2500 (2002)
- Chevrolet Suburban 2500 (2002)
- Chevrolet S10 / GMC Sonoma (2002-2004)
- Chevrolet Blazer / GMC Jimmy (2002-2005)
- Chevrolet Astro Van (2002-2005)
- GMC Safari Van (2002-2005)
Frequently Asked Questions
What exactly does a Body Control Module do?
The BCM is a computer that controls most of your vehicle’s non-engine related functions. This includes the power windows, door locks, interior and exterior lighting, security system, wipers, and instrument panel warnings. It acts as a central hub for all these convenience and safety features.
Why do you need my VIN to program the BCM?
Every vehicle is built with slightly different options (e.g., with or without keyless entry, power seats, etc.). Programming the BCM with your specific Vehicle Identification Number (VIN) ensures that the module is loaded with the correct software and configuration for your exact vehicle. This makes the installation process seamless and guarantees all features work as they did from the factory.
Is this a difficult part for a DIYer to install?
For someone with basic mechanical skills and tools, this is generally a straightforward installation. The main challenge is typically accessing the module, which may require removing a few plastic trim panels under the dashboard. Since our module comes pre-programmed, you avoid the most complex part of the job—the software configuration.
What if my airbag light comes on after I install it?
This is a possibility. The BCM communicates with the airbag system’s computer (SDM). Sometimes, they need to be electronically re-introduced. A procedure called “Setup SDM Primary Key in BCM” will be required. This must be done with a bi-directional professional scan tool, which most automotive repair shops have.
Do I have to send my old BCM back?
No, there is no core charge for this part. You can keep your old module, which saves you the time and expense of return shipping.