Restore Control and End Electrical Headaches in Your GM Truck or Van
If you’re dealing with bizarre electrical issues in your 2003-2007 GM vehicle—like power windows with a mind of their own, flickering lights, or a security system that randomly immobilizes your engine—you’ve likely met the frustrating reality of a failing Body Control Module (BCM). As a technician with over two decades of experience, I’ve seen these symptoms countless times. The BCM is the electronic nerve center for your vehicle’s comfort and security features, and when it starts to fail, it can make your reliable truck or van feel possessed.
This isn’t just an inconvenience; it can be a major disruption. A faulty BCM can leave you locked out, drain your battery overnight, or cause your dash lights to flash erratically while you’re driving. Instead of spending a fortune at the dealership for diagnostics and programming, this is your direct-fit, reliable solution. We take the guesswork and extra cost out of the equation by programming this 2003-2007 GM BCM to your vehicle’s specific Vehicle Identification Number (VIN) before we ship it. It arrives at your door ready to install, loaded with the latest GM software updates for optimal performance.
From the Diagnostic Bay: A Common Silverado Story
A customer brought in his ’05 Silverado 2500 with a list of complaints: the dome light wouldn’t turn off, the driver’s side power lock was dead, and the radio would sometimes stay on after he’d shut off the truck and opened the door. He’d already replaced the battery and checked fuses. After connecting my scan tool, I saw several communication error codes (U-codes) pointing to the BCM. These modules are often located under the steering column, where they can be susceptible to moisture from a leaky windshield seal or even just years of humidity. Sure enough, pulling the old BCM revealed faint signs of corrosion on the circuit board. Installing a VIN-programmed module like this one solved every single one of his issues in under an hour. It’s a common failure, but thankfully, it’s a straightforward fix.
Is Your GM Vehicle Showing These Symptoms?
- ✔ Power windows or door locks operating intermittently or not at all.
- ✔ Interior dome lights or exterior lamps staying on or not turning on.
- ✔ The security or anti-theft system preventing the engine from starting.
- ✔ Horn honking randomly or the alarm going off without reason.
- ✔ Dashboard warning lights appearing for no reason.
- ✔ Communication error codes stored, such as U0140 (Lost Communication With Body Control Module).
- ✔ No communication with the BCM when using a diagnostic scan tool.
Your Step-by-Step BCM Replacement Guide
Replacing the BCM is a manageable job for a DIYer with basic tools. The key is taking your time and being gentle with the plastic trim and electrical connectors.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to allow the systems to fully power down.
- Locate the BCM: On most Silverado and Sierra pickups, the BCM is located under the driver’s side of the dashboard, near the steering column. On Express and Savana vans, it’s typically found behind the center dash panel.
- Access the Module: You may need to remove lower dash panels or trim pieces to get a clear view and access to the BCM. A trim removal tool can help prevent scratching the plastic.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be pressed to release them. Never pull on the wires themselves. Once disconnected, unbolt or unclip the old BCM from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and reconnect all the electrical harnesses. Ensure each connector clicks securely into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position (without starting the engine) and test your lights, locks, windows, and other body functions to confirm they are working correctly.
Important Post-Installation Notes: While this 2003-2007 GM BCM is plug-and-play for most functions, some vehicles may require additional steps. If your airbag light is on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key’ procedure. A ‘Brake Pedal Position Relearn’ may also be necessary on certain models. Always refer to a service manual for your specific vehicle if you are unsure.
Will This Fit My Truck or Van?
This module is a direct replacement for several original part numbers and is guaranteed to fit the following vehicles. Please verify your model and options below.
Replaces Part Numbers: 15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, 10367689
Chevrolet Silverado & GMC Sierra Pickups (1500, 2500, 3500): 2003-2007 (including ’07 Classic models)
Chevrolet SSR: 2003-2006
Note: Please see the detailed fitment list in the original product data for specific options and exclusions (e.g., Crew Cab, transmission type).
Frequently Asked Questions About This 2003-2007 GM BCM
Do I need to send my old BCM back?
No. There is no core charge for this part. You can keep your original module.
Is this part difficult to install?
For someone with basic mechanical skills, it is a straightforward process. The most important part is that this module arrives pre-programmed to your VIN, which eliminates the need for expensive dealership tools for the main setup.
What information do you need from me?
After you complete your purchase, you must provide us with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your BCM without it.
My airbag light came on after installation. Is the part defective?
No, this is a normal 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 professional-grade scan tool to sync the modules and turn off the light.
What if some features still don’t work correctly?
In some cases, a ‘Brake Pedal Position Relearn’ may be needed to ensure brake lights and traction control work properly. If you encounter any issues, consulting a factory service manual or a qualified technician is the best next step.