Solve Persistent Electrical Problems in Your GM Truck or SUV
If you’re dealing with a frustrating array of electrical gremlins in your 2002-2005 GM vehicle—like power windows that won’t budge, door locks with a mind of their own, erratic interior lighting, or a security light that prevents your engine from starting—the root cause is often a failing Body Control Module (BCM). As the central command for your vehicle’s body electronics, a faulty BCM can create chaos. This replacement BCM, part number 15081796, is the reliable, straightforward solution to restore order and get all your vehicle’s convenience features working correctly again.
We take the biggest hassle out of the repair process. Unlike a unit from a dealership or salvage yard, this BCM arrives at your door pre-programmed with the latest GM software, specifically matched to your vehicle’s VIN. This means no extra trips to a mechanic for expensive programming. It’s designed to be a direct-fit replacement, making the job manageable for a confident DIYer or a quick swap for a professional technician.
From the Diagnostic Bay: The Case of the 2002 Silverado’s Ghost
I had a 2002 Silverado 1500 in my bay that was driving the owner crazy. The complaint was intermittent no-start, but the battery and starter tested fine. On top of that, the dome light would sometimes flicker, and the driver’s power window worked only when it wanted to. There were no engine codes, but a deeper scan with a professional tool revealed several U-codes (communication loss) pointing to the BCM. These modules, especially from this era, are notorious for internal solder joint failures. After swapping in a VIN-programmed BCM, every single issue vanished. It’s a classic example of how a single failing module can cause multiple, seemingly unrelated symptoms.
Is Your GM Truck or SUV Showing These Symptoms?
A failing BCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Power windows, mirrors, or door locks operating intermittently or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The security or anti-theft light is illuminated on the dash, often causing a no-start condition.
- ✔ Inconsistent or non-functional heating and A/C blower motor controls.
- ✔ False warning messages on the driver information center (DIC).
- ✔ Communication-related Diagnostic Trouble Codes (DTCs), such as U0140, U0155, or B1001.
- ✔ The radio or other accessories not turning off after the key is removed.
A Straightforward Guide to BCM Installation
Replacing the BCM is a manageable task. While the location varies slightly between trucks and vans, the general process is similar. Always disconnect the battery before starting any electrical work.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the system to discharge.
- Locate the BCM: On most trucks and SUVs (Silverado, Sierra, Tahoe, Yukon), it’s under the driver’s side of 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.
- Disconnect and Remove: Unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely plug in all the electrical connectors. You should hear a click as they lock into place.
- Post-Installation Steps: Reconnect the battery. In some cases, you may need to perform a ‘Setup SDM Primary Key in BCM’ procedure if the airbag light is on, or a ‘Brake Pedal Position Relearn’. These procedures often require a bi-directional scan tool. Test all functions (lights, locks, windows) to confirm the repair.
Disclaimer: Specific procedures can vary by vehicle. Always consult a factory service manual or a qualified technician for guidance.
Will This Fit My Vehicle?
This BCM is a direct replacement for a wide range of GM vehicles and interchanges with several part numbers. Please verify your vehicle is on this list and, if possible, match your original part number. This module is compatible with part numbers: 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU.
- Astro / Safari (GMC): 2002-2005
- Avalanche 1500: 2002 (4×2)
- Blazer S10 / Jimmy S15: 2002-2005
- Escalade: 2002 (4×2)
- S10 / S15 / Sonoma: 2002-2004
- Sierra / Silverado 1500, 2500, 3500: 2002
- Sierra Denali: 2002
- Suburban 1500 / 2500: 2002
- Tahoe: 2002 (4×2)
- Yukon / Yukon XL 1500, 2500: 2002
Frequently Asked Questions
Do I need to do any programming after I install it?
No. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation. However, some vehicles may require a ‘Setup SDM Primary Key’ or ‘Brake Pedal Position Relearn’ with a scan tool for full system integration.
Where do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we have this information to perform the programming.
Do I need to return my old BCM?
No, there is no core charge for this part. You can keep your original module.
What tools do I need for installation?
For most models, you will only need basic hand tools like a socket set and a trim removal tool to access the BCM. A professional diagnostic scan tool may be required for post-installation procedures if a warning light appears.
Will this fix my ‘Service 4WD’ message?
While a BCM can cause a wide range of issues, a ‘Service 4WD’ message is more commonly related to the Transfer Case Control Module (TCCM) or the encoder motor. It’s important to diagnose the specific codes before ordering parts.