If you’re dealing with bizarre electrical issues in your GM truck or van, you’re not alone. As a technician with over two decades of experience, I’ve seen countless vehicles where power windows have a mind of their own, the security light flashes for no reason, or the interior lights flicker like a scene from a horror movie. These aren’t random gremlins; they’re classic signs of a failing Body Control Module (BCM). This module is the central nervous system for your vehicle’s body electronics, and when it starts to fail, it can cause a cascade of frustrating problems. This isn’t just an inconvenience; a faulty BCM can affect security systems, leaving you stranded.
We offer a dependable and straightforward solution: a replacement BCM, part number 15747545, that arrives at your door pre-programmed for your specific vehicle. Forget about costly dealership visits for programming and diagnostics. Simply provide us with your Vehicle Identification Number (VIN) during checkout, and our experts will flash the module with the latest, most stable software from GM. This ensures perfect integration and restores all the functions you rely on, from power locks to the radio. This is the most efficient way to get your truck back to 100% functionality.
A Technician’s Notebook
I remember a 2006 Silverado 2500 that came into the shop with a truly baffling issue. The owner complained that his power door locks would cycle randomly while driving, and sometimes the dome light wouldn’t turn off, draining the battery overnight. He’d already replaced the battery and checked fuses. My initial scan showed a dozen intermittent communication codes (U-codes) pointing to multiple systems. This is a red flag. Instead of chasing each code, I focused on the common link: the BCM. On these GMT800 platforms, water intrusion from a leaking windshield seal can drip directly onto the BCM, causing corrosion and these exact chaotic symptoms. We installed a pre-programmed BCM, and every single electrical gremlin vanished. It’s a textbook case of how a single module can create widespread, confusing problems.
Is Your GM Truck Showing These BCM Failure Signs?
A failing BCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely culprit:
- ✔ Erratic power windows, door locks, or mirrors that work intermittently or not at all.
- ✔ The security or anti-theft light stays on, preventing the engine from starting.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The radio or instrument cluster randomly loses power or behaves erratically.
- ✔ Key fob stops working even with a new battery.
- ✔ Diagnostic trouble codes (DTCs) related to communication loss, such as U0140, U0155, or U0164.
- ✔ Horn honking unexpectedly or not working at all.
A Straightforward Guide to Your BCM Installation
Replacing the BCM in most of these trucks and vans is a job a confident DIYer can handle. Our pre-programming service eliminates the most difficult step. Here’s a general guide:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the BCM: In Silverado and Sierra pickups, it’s typically located under the driver’s side of the dashboard, near the steering column. In Express and Savana vans, it’s often behind the center dash panel.
- Remove Trim Panels: You may need to remove the lower dash panel or other trim pieces to gain access. These are usually held by clips or a few screws.
- 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 BCM: Mount your new, pre-programmed BCM in the same location and securely reconnect all the electrical harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all body functions: windows, locks, lights, radio, etc.
- Perform Relearns (If Needed): As noted in our policies, if the airbag light is on or brake functions seem off, a specific relearn procedure may be required using a professional scan tool.
Verified Vehicle Compatibility for Part 15747545
This Body Control Module is a direct replacement for part numbers 15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, and 10367689. It fits a wide range of GM vehicles, including:
- ✔ 2003-2006 Chevrolet Silverado & GMC Sierra 1500/2500/3500 (exc. Crew Cab)
- ✔ 2007 Chevrolet Silverado & GMC Sierra ‘Classic’ (creased door skin, exc. Crew Cab)
- ✔ 2003-2007 Chevrolet Express & GMC Savana 1500/2500/3500 Vans
- ✔ 2003-2006 Chevrolet SSR
Note: Please verify your specific model options in the detailed fitment list or contact us with your VIN to confirm compatibility before ordering.
Frequently Asked Questions
Do I need to send you my old BCM?
No. This product comes with absolutely no core charge. You can keep your original module, which can be helpful for reference or as a backup.
What does ‘programmed to my VIN’ mean?
It means we load the BCM with the specific software and settings your vehicle had when it left the factory, plus any official GM updates. This makes the installation process much simpler and avoids a mandatory trip to the dealership for programming.
My airbag light came on after I installed the new BCM. Is it defective?
No, this is a known possibility. The new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). This requires a ‘Setup SDM Primary Key in BCM’ procedure with a bi-directional scan tool. A local repair shop can perform this for you.
What tools are needed for the installation?
For most models, you’ll only need basic hand tools like a socket set and a trim removal tool to access the BCM. The most important part is that no special programming tools are required from you, since we handle that part before shipping.
Will this fix my ‘Service 4WD’ message?
While the BCM communicates with many modules, a ‘Service 4WD’ message is more commonly related to the Transfer Case Control Module (TCCM), the encoder motor, or the dash switch. It’s best to have the vehicle scanned for specific codes to pinpoint the issue.
What happens if I don’t provide my VIN?
We cannot ship the module without your VIN. The programming is essential for the part to function correctly in your vehicle. We will contact you after your purchase to request the VIN to prevent delays.