Restore Your Truck’s Electrical Functions and Peace of Mind
Are you dealing with baffling electrical problems in your GM truck or van? Flickering interior lights, power windows with a mind of their own, or a security system that randomly prevents you from starting the engine? These aren’t just annoyances; they’re classic signs of a failing Body Control Module (BCM). As an experienced technician, I’ve seen how a faulty BCM can turn a reliable workhorse into a source of daily frustration. The BCM is the central hub for your vehicle’s body electronics, and when it goes, it takes comfort and convenience features down with it.
This isn’t just a replacement part; it’s a complete, hassle-free solution. We take a reliable BCM, part number 15747545, and program it specifically to your vehicle’s VIN before it ships. This means it arrives at your door loaded with the latest GM software updates tailored for your exact make and model. You get to skip the expensive trip to the dealership for programming, saving you both time and hundreds of dollars in labor fees. It’s the most direct path to getting your truck or van back to normal.
A Technician’s Notebook
I remember a 2006 Silverado 2500 that came into the shop with a laundry list of complaints. The owner said the radio would cut out, the dome light would stay on, and sometimes the power locks wouldn’t respond. He’d already replaced the battery and checked fuses, but the gremlins persisted. A quick scan with a pro tool showed multiple U-codes (communication errors) pointing to the BCM. Instead of sending him to the dealer for a pricey new module and programming, we installed a VIN-programmed unit just like this one. In under an hour, every single issue was resolved. He drove away with a truck that felt like new again, all without the dealership hassle.
Is Your GM Truck or Van Showing These Signs?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, a faulty 2003-2007 GM BCM is the likely culprit:
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights flickering, staying on, or not working at all.
- ✔ The security or anti-theft system activating incorrectly, causing a no-start condition.
- ✔ Inaccurate or dead gauges on the instrument cluster.
- ✔ Intermittent operation of the radio or climate controls.
- ✔ Diagnostic trouble codes (DTCs) related to communication loss, such as U0140, U0155, or other U-codes.
Your Straightforward BCM Installation Guide
Replacing the BCM is a manageable job for a confident DIYer. While the exact location varies slightly between trucks (under the steering column) and vans (center dash), the process is similar. Always have your vehicle’s service manual handy for specific details.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the systems to fully discharge.
- Locate the BCM: On Silverado/Sierra pickups, it’s typically mounted to a bracket under the driver’s side of the dashboard, near the steering column. On Express/Savana vans, it’s usually behind the center dash trim.
- Remove Connectors: Carefully unplug all electrical connectors from the old BCM. They have locking tabs, so don’t force them. Press the tab and gently pull.
- Swap the Module: Unbolt or unclip the old BCM from its mounting bracket and remove it. Install the new, pre-programmed BCM in its place.
- Reconnect Everything: Plug all electrical connectors firmly into the new module. You should hear a click as they lock into place.
- Power Up: Reconnect the negative battery terminal. Turn the key to the ‘On’ position (without starting) and test all functions: windows, locks, lights, and radio.
Important Post-Installation Information
Because this 2003-2007 GM BCM is pre-programmed, most functions will work immediately. However, depending on your vehicle’s specific systems, a couple of additional steps might be necessary:
- Airbag System Sync: If your airbag warning light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor relearn to ensure proper brake light and traction control operation. This also typically requires a capable diagnostic tool.
Disclaimer: Always consult a factory service manual or a qualified technician for guidance specific to your vehicle.
Verified Fitment for Your GM Vehicle
This module is a direct replacement for part number 15747545 and other interchangeable numbers. It is guaranteed to fit the following vehicles, provided the options match:
• 1500, 2500, 3500 (2003-2006) – Body Control (BCM); under steering column, exc. Crew Cab
• 1500, 2500, 3500 (2007 Classic) – Body Control (BCM); under steering column, exc. Crew Cab (check for specific transmission options MT/AT as listed in original data)
Chevrolet Express & GMC Savana Vans:
• 1500, 2500, 3500 (2003) – Body Control (BCM); center dash
• 1500, 2500, 3500 (2004-2007) – Body Control (BCM); center dash, w/o commercial tradesman package
Chevrolet SSR:
• SSR (2003-2006) – Body Control (BCM)
Replaces Part Numbers: 15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, 10367689
Frequently Asked Questions
Frequently Asked Questions
Do I really need to provide my VIN?
Yes, providing your VIN is essential. We use it to load the correct, vehicle-specific software and the latest updates from GM onto your BCM before we ship it. This step is what allows for a much simpler installation without a trip to the dealer.
Is this a plug-and-play part?
For most vehicles, it is very close to plug-and-play. Because it’s pre-programmed, the core functions will work upon installation. However, as noted above, some security, airbag, or brake systems may require a final synchronization procedure with a professional scan tool.
What is a core charge? Do I have one?
A core charge is a deposit you pay until you return your old part. We make it simple: there is absolutely no core charge on this BCM. You can keep your old module.
Will this fix my ‘Service 4WD’ light?
While a BCM can cause a wide range of issues, a ‘Service 4WD’ message is more often related to the Transfer Case Control Module (TCCM), the encoder motor, or the switch on the dash. It’s best to have the codes scanned to pinpoint the exact cause before ordering a BCM for that specific issue.
Can I install this myself if I’m not a mechanic?
If you are comfortable working under the dashboard, using basic hand tools, and carefully unplugging electrical connectors, this is a very achievable DIY repair. The most important part is being patient and methodical.