Tired of Chasing Electrical Gremlins in Your GM Truck or Van?
As a technician with over two decades of experience, I’ve seen it all. A customer comes in with a Silverado, Sierra, or Express van exhibiting the strangest symptoms: the radio turns on by itself, power windows have a mind of their own, the security light flashes for no reason, or worse, the vehicle won’t start intermittently. These aren’t random glitches; they’re classic signs of a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s body electronics, and when it starts to go, it can cause a cascade of frustrating and hard-to-diagnose problems.
Stop throwing parts at the problem. This is the direct-fit, reliable solution you’ve been looking for. We offer a genuine OEM-quality 2003-2007 GM BCM that arrives at your doorstep programmed specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our experts will flash the module with the latest GM software updates. This critical step ensures all your vehicle’s options and security systems communicate perfectly, saving you a costly trip to the dealership for programming.
From the Diagnostic Bay
“A customer brought in his 2006 Silverado 2500 last month. The complaint was ‘it’s possessed.’ The dome lights wouldn’t turn off, draining the battery overnight, and the power door locks worked only when they felt like it. He’d already replaced the battery and checked all the fuses. After hooking up the scanner, I saw multiple communication loss codes with the BCM. Instead of a complex rewiring job, the fix was simple: a new, properly programmed BCM. We installed one just like this, performed the security relearn, and the truck was back to normal in under an hour. These modules are the root cause of electrical headaches more often than not.”
Is Your GM Truck or Van Showing These Symptoms?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the solution:
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights staying on or not working at all.
- ✔ The security system acting up, causing no-start conditions (“Security” or lock icon on the dash).
- ✔ Horn honking unexpectedly or not working.
- ✔ Inaccurate or dead gauges on the instrument cluster.
- ✔ Diagnostic trouble codes (DTCs) related to U-codes (communication) or B-codes (body).
A Straightforward Guide to BCM Installation
Replacing the BCM is a manageable job for a DIYer with basic tools. While the exact location varies slightly between trucks and vans, the process is similar. This guide covers the general steps for a Silverado/Sierra pickup.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the BCM: On most pickups, the BCM is located under the driver’s side of the dashboard, near the steering column. You may need to remove a lower dash panel for access. For Savana/Express vans, it’s typically behind the center dash trim.
- Disconnect the Connectors: The BCM will have several large multi-pin electrical connectors. Carefully press the release tabs on each connector and pull them straight out. They are color-coded to prevent mix-ups.
- Remove the Old Module: The BCM is usually held in place by a few small bolts or clips. Remove the fasteners and carefully take out the old module.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and secure it with the original fasteners.
- Reconnect Everything: Plug all the electrical connectors back into their corresponding ports on the new BCM. You’ll hear a click as they lock into place. Reinstall any dash panels you removed.
- Power Up and Relearn: Reconnect the battery terminal. The vehicle may need to go through a security relearn procedure to recognize the new BCM. This often involves turning the key to the ‘ON’ position for 10-15 minutes.
Important Post-Installation Procedures
After installing your new 2003-2007 GM BCM, a couple of final steps are essential for full system functionality. These procedures require a professional-grade scan tool.
- Airbag System (SRS): To clear the airbag warning light, you must perform the ‘Setup SDM Primary Key in BCM’ procedure. This ensures the new BCM and the airbag’s Sensing and Diagnostic Module (SDM) are correctly paired for safety.
- Brake Pedal Position: Some vehicles require a ‘Brake Pedal Position Sensor Calibration’ to ensure the brake lights and stability control systems function correctly.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, and 10367689. It fits a wide range of models:
- Chevrolet Express 1500/2500/3500 Van (2003-2007)
- Chevrolet Silverado 1500/2500/3500 Pickup (2003-2007 Classic)
- Chevrolet SSR (2003-2006)
- GMC Savana 1500/2500/3500 Van (2003-2007)
- GMC Sierra 1500/2500/3500 Pickup (2003-2007 Classic)
Note: Please check the detailed fitment list in the original description to confirm specific options and exclusions (e.g., Crew Cab, transmission type).
Frequently Asked Questions
Do I really need to provide my VIN?
Yes, absolutely. Providing your VIN is the most important step. We use it to program the BCM with the correct software and vehicle-specific options, ensuring it works perfectly right out of the box without requiring a trip to the dealer.
Is this a difficult part to install myself?
For someone with basic mechanical skills, this is a very doable DIY job. It typically involves removing a dash panel and swapping the module. The most important part is the post-installation procedures like the security relearn, which can often be done without special tools.
What happens if I don’t do the airbag or brake pedal procedures?
If the ‘Setup SDM Primary Key’ procedure isn’t done, the airbag warning light will remain on, and the SRS system may not function correctly in an accident. Skipping the brake pedal calibration could lead to issues with brake light operation or stability control warnings.
Will this fix my ‘Service 4WD’ message?
While a faulty BCM can cause a variety of issues, a ‘Service 4WD’ message is more commonly related to the Transfer Case Control Module (TCCM) or the encoder motor. It’s best to have the codes scanned to pinpoint the exact cause before ordering.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part that has been programmed with the latest software for your vehicle, offering a reliable and cost-effective alternative to a brand new dealer part.