Restore Your GM Truck’s Brain and End Electrical Frustrations
Are you chasing electrical gremlins in your Silverado, Sierra, or Express/Savana van? Flickering lights, a security system that has a mind of its own, or power accessories that work one minute and not the next are classic signs of a failing Body Control Module (BCM). The BCM is the central command center for your truck’s body electronics, and when it starts to fail, it can cause a cascade of confusing and frustrating problems. Stop throwing parts at the issue. This is the direct, reliable solution you’ve been looking for—a high-quality replacement BCM, pre-programmed specifically for your vehicle.
We take the biggest headache out of the repair process: programming. Simply provide us with your vehicle’s VIN at checkout, and our technicians will flash this module with the latest official GM software for your exact build. This means no expensive trips to the dealer, no need for a high-end scan tool, and no subscription fees. You get a component that is truly ready to install right out of the box, restoring the function and reliability you depend on. This is the smart, efficient way to get your truck or van back in top form.
From the Diagnostic Bay
A customer brought in his 2006 Sierra 2500 last month with a laundry list of bizarre symptoms. The radio would shut off randomly, the dome light would flicker while driving, and the ‘Security’ light on the dash was constantly on, sometimes causing a no-crank condition. He’d already replaced the battery and checked the main grounds. After hooking up my diagnostic tool, I saw multiple communication loss codes with various modules. In my 20+ years of experience, this pattern almost always points to the BCM. Corrosion on the internal circuit board, often from moisture intrusion, had compromised the module’s ability to talk to the rest of the truck. We installed one of these VIN-programmed BCMs, and every single issue was resolved instantly. It’s a common failure point on these workhorses, but thankfully, it’s a straightforward fix.
Is Your GM Truck or Van Showing These Signs?
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights flickering, staying on, or not working at all.
- ✔ The anti-theft or security system light is illuminated, preventing the engine from starting.
- ✔ Inaccurate or dead gauges on the instrument cluster.
- ✔ Communication error codes (U-codes) stored in the system.
- ✔ The radio or climate control system behaves erratically.
Your Straightforward BCM Installation Guide
Replacing the BCM is a manageable job for a DIYer with basic tools. 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 beginning.
- 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.
- Remove Trim Panels: Carefully remove any plastic trim or panels necessary to access the module. These are often held by clips or a few screws.
- Disconnect and Remove: The BCM has several large multi-pin electrical connectors. Depress the locking tabs on each connector and pull them straight out. Then, unbolt or unclip the module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in place and securely reconnect all electrical connectors. You should hear a ‘click’ as they lock in.
- Post-Installation Procedures: Reconnect the battery. You will need to perform a couple of important relearn procedures. See the critical notes below.
Important Final Steps After Installation
Once the new BCM is installed, a few final steps are required to ensure all systems operate correctly. These procedures sync the new module with your vehicle’s other safety systems.
- Airbag System Reset: The airbag warning light will likely be on. You must use a capable diagnostic scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure. This re-establishes the secure link between the BCM and the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Sensor Relearn: Some vehicles may require the Brake Pedal Position Sensor to be recalibrated. This ensures the brake lights and stability control system receive accurate input. This is also done with a scan tool.
Note: If you are not comfortable performing these steps, a local professional mechanic can typically complete them quickly.
Verified Fitment for Your GM Vehicle
This Body Control Module is a direct replacement for part number 15747545 and other interchangeable numbers. It fits a wide range of GM models, but please check the specific options for your vehicle.
Compatible Models Include:
- Chevrolet Silverado & GMC Sierra 1500/2500/3500 (2003-2007): Fits various configurations, primarily non-Crew Cab models. Check the 2007 ‘classic’ style notes.
- Chevrolet Express & GMC Savana 1500/2500/3500 (2003-2007): Fits models typically without the commercial tradesman package.
- Chevrolet SSR (2003-2006)
Please refer to the detailed fitment list at the top of the page to confirm compatibility with your exact year, model, and options.
Frequently Asked Questions
What exactly does a Body Control Module do?
The BCM is a computer that manages the non-engine related electronic systems in your vehicle. This includes power windows, locks, interior and exterior lighting, the security system, wipers, and instrument cluster functions.
Is this BCM really ready to install out of the box?
Yes. We program the module using the VIN you provide, loading it with the correct software and vehicle-specific options. This eliminates the need for you to have it programmed at a dealership. However, you will still need to perform the post-install relearn procedures mentioned above.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the specific factory build data for your truck or van. This ensures we load the correct software and enable the right features (like keyless entry, fog lights, etc.) for your vehicle.
Will this fix my ‘Security’ light and no-start problem?
A faulty BCM is a very common cause of security system issues on these GM vehicles. This programmed module is designed to resolve those problems by restoring proper communication with the Passlock or Passkey anti-theft system.
What tools do I need for the installation?
For the physical replacement, you’ll only need basic hand tools like a socket set and a trim removal tool. For the mandatory post-installation steps (Airbag and Brake Pedal relearn), a bi-directional diagnostic scan tool is required.
What if I order the wrong part?
We strongly encourage you to match your original part number and check our detailed fitment list. Providing your VIN for programming also acts as a final check. If you have any doubts, please contact us before ordering so we can ensure you get the right part the first time.