Tired of Electrical Gremlins in Your GM Truck or Van?
As a technician with over two decades of experience, I’ve seen it all when it comes to baffling electrical problems. Your power windows have a mind of their own, the dash lights flicker like a haunted house, or worse, your truck refuses to start for no apparent reason. These aren’t just annoyances; they’re symptoms of a failing Body Control Module (BCM), the central nervous system for your vehicle’s body electronics. When it fails, it can cause chaos. This isn’t a part you can ignore—it’s essential for proper function and safety.
We offer a straightforward, reliable solution: a replacement Body Control Module, part number 15136876, that arrives at your door pre-programmed for your specific vehicle. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our experts will flash the module with the latest GM factory software. This critical step ensures all your vehicle’s options are recognized, saving you a costly trip to the dealership and the hassle of specialized programming tools. This is the definitive fix for your 2003-2007 GM BCM issues.
From the Diagnostic Bay: The Phantom Battery Drain
I once had a 2005 Silverado 2500 in my shop that was a real head-scratcher for another mechanic. The owner complained of a dead battery every two or three days. He’d already replaced the battery and alternator, but the problem persisted. After hooking up an ammeter, I found a significant parasitic draw. By pulling fuses one by one, we isolated the circuit, which led straight to the BCM. The internal circuitry had failed, preventing the module from ‘sleeping’ when the truck was off. It was constantly drawing power, draining the battery overnight. A new, properly programmed BCM solved the issue instantly. It’s a classic failure mode for these modules.
Is Your GM Truck or Van Showing These Symptoms?
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior dome lights staying on or not turning on correctly.
- ✔ The security or anti-theft light is illuminated, causing a no-start condition.
- ✔ Gauges on the instrument cluster behaving strangely or not working.
- ✔ Unexplained battery drain (parasitic draw) when the vehicle is off.
- ✔ Horn honking randomly or not working when pressed.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as U0140 (Lost Communication With Body Control Module).
Your Straightforward Installation Guide
Replacing the BCM is a manageable job for a confident DIYer. The location varies slightly between trucks and vans, but the process is similar.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before starting work.
- Locate the BCM: On Silverado and Sierra pickups, it’s typically found under the driver’s side of the dashboard, near the steering column. On Express and Savana vans, it’s usually located behind the center dash panel.
- Disconnect and Remove: Carefully 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 Module: Mount your new, pre-programmed BCM in the same location. Firmly reconnect all electrical connectors, ensuring they click into place.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Final Checks: Start the vehicle and test all body functions—windows, locks, lights, wipers, etc. Note that some vehicles may require post-installation procedures as outlined below.
Important Post-Installation Procedures
While this 2003-2007 GM BCM is delivered ready for installation, some vehicle systems may need to be re-synced after the new module is in place.
- Airbag System Sync: If the airbag warning light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure must be performed with a professional scan tool. This is only necessary if the light appears.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure correct brake light operation and to prevent issues with the traction control system.
Disclaimer: Specific procedures can vary by vehicle. Always consult a factory service manual or a qualified technician for guidance.
Will This Fit My GM Vehicle?
This module is a direct replacement for a wide range of popular GM trucks and vans. It is compatible with the following original equipment part numbers: 15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, and 10367689. Plus, there is no core charge—you can keep your old part!
This part fits the following models:
- Chevrolet Silverado 1500/2500/3500 (2003-2007 Classic, exc. Crew Cab)
- GMC Sierra 1500/2500/3500 (2003-2007 Classic, exc. Crew Cab)
- Chevrolet Express 1500/2500/3500 Van (2003-2007)
- GMC Savana 1500/2500/3500 Van (2003-2007)
- Chevrolet SSR (2003-2006)
Note: Please check the detailed fitment information in the original listing to confirm compatibility with your specific options (e.g., transmission type, cab style).
Do I need to program this BCM?
Do I need to program this BCM?
No. This is the biggest benefit of our service. We program the module to your vehicle’s specific VIN before we ship it. This saves you the time, hassle, and expense of a dealership visit for programming.
What is a BCM and what does it do?
The Body Control Module (BCM) is a computer that controls most of your vehicle’s non-engine related electronic functions. This includes power windows, locks, interior and exterior lighting, wipers, the security system, and more.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) contains all the specific information about your truck or van’s factory-installed options. We use the VIN to load the correct software and calibrations onto the BCM, ensuring it works perfectly with your exact vehicle configuration.
Is this a difficult part to install?
For most DIYers with basic tools, this is a very manageable repair. The physical swap involves unplugging the old module and plugging in the new one. The most important part, the programming, is already done for you.
What if my airbag light comes on after installation?
This is uncommon, but if it happens, the BCM needs to be synced with the airbag system’s computer (SDM). This procedure, called ‘Setup SDM Primary Key in BCM’, requires a professional-grade diagnostic tool to complete.
Don’t let a faulty module dictate how your truck behaves. Take control of the repair with this reliable, pre-programmed 2003-2007 GM BCM and restore your vehicle’s functionality and your peace of mind.