Fix Your Truck’s Electrical Gremlins for Good
Is your 2003-2007 GMC Sierra 1500 acting possessed? Flickering lights, a dead A/C, or power windows with a mind of their own are classic signs of a failing Body Control Module (BCM). The BCM is the central nervous system for your truck’s comfort and convenience features. When it fails, it can cause a cascade of frustrating electrical issues. This replacement BCM, part number 15136877, is the definitive solution to restore full functionality and reliability to your truck. Thanks to our unique Cloning Service, this module arrives ready for a true plug-and-play installation, no dealership trip required.
From the Diagnostic Bay: The Case of the Haunted Sierra
I remember a 2005 Sierra 1500 that rolled into my shop. The owner was at his wit’s end. The radio would cut out, the driver’s side window wouldn’t roll down, the HVAC blower was intermittent, and the security light would flash randomly, sometimes causing a no-start condition. He’d already replaced the battery and checked all the fuses. After connecting my scan tool, I saw a handful of communication codes and a specific DTC, B1001, pointing to an internal BCM fault. These seemingly unrelated problems all stemmed from one failing component. We swapped in a cloned BCM, and in less than 10 minutes, every single issue was resolved. This is a textbook BCM failure, and this part is the exact fix for that headache.
Common Signs of a Failing BCM
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, door locks, or mirrors not working correctly.
- ✔ HVAC system failure, including an unresponsive blower motor or climate controls.
- ✔ The security system preventing the engine from starting (Security light flashing).
- ✔ The airbag or SRS warning light is illuminated on the dash, often with DTC B1001.
- ✔ Intermittent operation of the windshield wipers.
- ✔ False warnings or messages appearing on the driver information center.
A Straightforward Guide to Installation
Getting your Sierra back to normal is easier than you think. Our cloning service makes this a simple component swap that you can do in your own driveway.
- Safety First: Always disconnect the negative terminal from your truck’s battery before starting any electrical work.
- Locate the BCM: On most Sierra models, the BCM is located under the driver’s side of the dashboard, near the steering column. It’s a black box with several large wiring harnesses connected to it.
- Swap the Modules: Carefully unplug the wiring connectors from your old BCM. They have locking tabs that need to be depressed. Remove any bolts or clips holding the old module in place, then install your new, pre-programmed module in its place.
- Reconnect and Test: Securely plug all wiring harnesses into the new BCM. Reconnect the battery terminal and start the truck. Test all functions like windows, locks, lights, and HVAC to confirm the repair.
Important Post-Installation Notes
While our cloning service handles the primary programming, some vehicle systems may require a quick sync. If your airbag light remains on after installation, a professional scan tool is needed to perform the “Setup SDM Primary Key in BCM” procedure. Similarly, a Brake Pedal Position relearn might be required on some models to ensure proper brake light and stability control function. These are simple procedures for any qualified technician.
Will This Fit My Truck?
This BCM is a direct-fit replacement for a wide range of General Motors trucks and SUVs. While it is the specified part for the 2003-2007 Sierra 1500 BCM, it also fits the following vehicles (please verify your specific options):
GMC: Sierra 1500/2500/3500 & Denali (03-07 Classic), Yukon & Yukon XL (03-06)
Cadillac: Escalade, ESV, EXT (03-06)
Hummer: H2 (03-07)
This module is interchangeable with part numbers: 15116066, 15136225, 15136877, 15137393, 15198116, and others.
Frequently Asked Questions
What exactly is a “Cloning Service”?
Our Cloning Service involves transferring the essential vehicle-specific data—like your VIN, mileage, and key information—from your original BCM directly to the replacement unit. This makes the new module a perfect digital copy, ensuring it communicates seamlessly with your truck’s other computers without needing a trip to the dealership for expensive programming.
Do I need to send my original BCM to you?
Yes. For the cloning process to work, you must send us your original module after placing your order. We will perform the service and ship both your original and the ready-to-install replacement back to you promptly.
Is there a core charge for this part?
No, there is no core charge. We always return your original module along with the newly programmed replacement, so you don’t have to worry about extra fees or core returns.
Will this fix my airbag light?
If the airbag light is caused by a BCM fault (like DTC B1001), this module will resolve the root cause. However, after installation, the airbag system’s computer (SDM) may need to be synced with the new BCM using a professional scan tool to clear the light from the dash.
What tools do I need for installation?
Basic hand tools are all that’s required for the physical swap—typically just a socket or screwdriver to remove the module. No special programming tools are needed on your end, as our cloning service handles that for you.