Restore Your GM Truck’s Electrical System with a Plug-and-Play BCM
Are you chasing electrical gremlins in your 2003-2007 GM truck or van? Flickering lights, a battery that dies overnight, power windows with a mind of their own, or strange security system alerts are classic signs of a failing Body Control Module (BCM). As a technician with over two decades of experience, I’ve seen how a faulty BCM can turn a reliable workhorse into a source of constant frustration. This isn’t just an inconvenience; it’s a critical failure in your vehicle’s central nervous system.
This replacement 2003-2007 GM BCM is the definitive solution to these baffling issues. We take the guesswork and hassle out of the repair. Simply provide your vehicle’s VIN at checkout, and our experts will program the module with the latest GM software specific to your truck or van. It arrives at your door ready for installation, saving you a costly trip to the dealership for programming. This is the most direct path to restoring the factory performance of your vehicle’s body electronics.
From the Diagnostic Bay
I remember a 2006 Silverado 2500 that came into my shop with a bizarre complaint: the radio would randomly turn on, even with the truck off and keys out, draining the battery. The owner had already replaced the battery twice. We scanned for codes and found a series of U-codes, indicating a communication breakdown. After checking the wiring, we pinpointed the BCM. A failing internal relay was causing a parasitic draw. Installing a pre-programmed BCM like this one solved the problem instantly. It’s a common failure point I’ve diagnosed hundreds of times on these otherwise tough trucks.
Is Your GM Truck or Van Showing These Signs?
- âś” Intermittent or non-functional power windows, door locks, or interior lights.
- âś” The security system or horn activates randomly.
- âś” Unexplained battery drain that leaves you stranded (parasitic draw).
- âś” Dashboard warning lights that flicker or stay on without a clear cause.
- âś” Communication error codes, particularly U-codes like U0140 (Lost Communication With Body Control Module).
- âś” Erratic behavior from the radio or climate controls.
Your Straightforward BCM Installation Guide
For the confident DIYer or professional mechanic, installing this 2003-2007 GM BCM is a manageable job. While locations vary slightly, the process is generally similar.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes to allow all modules to power down completely.
- Locate the BCM: On most Silverado and Sierra pickups, it’s located under the driver’s side of the dashboard, near the steering column. For Express and Savana vans, it’s typically found behind the center dash panel.
- Remove Trim Panels: Carefully remove any plastic trim or kick panels necessary to access the module. These usually pop off or are held by a few screws.
- Disconnect and Remove: 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 reconnect all the electrical connectors. Ensure they click securely into place.
- Reconnect and Test: Re-install any trim panels you removed. Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all body functions: lights, locks, windows, radio, etc.
- Post-Install Procedures: In some cases, an airbag light may appear or brake functions may need recalibration. This is normal. An ‘Airbag System Sync’ or ‘Brake Pedal Position Relearn’ may be required using a professional scan tool to finalize the installation.
Guaranteed Compatibility for Your Vehicle
This module is a direct replacement for part number 15167329 and is also compatible with the following part numbers: 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, and 10367689. It is designed to fit a wide range of GM models. Please verify your vehicle from the list below to ensure proper fitment.
GMC: Sierra 1500/2500/3500 (03-07 Classic), Savana 1500/2500/3500 Van (03-07)
Note: Please check the detailed fitment list in the original description for specific options like transmission type, cab configuration, and package exclusions to confirm this is the correct part for your exact vehicle.
Frequently Asked Questions
Frequently Asked Questions
Does this BCM really come programmed?
Yes. We program the module to your vehicle’s specific VIN before shipping. This ensures it works with your existing keys and options, eliminating the need for a dealership visit for programming.
Do I need to send my old BCM back?
No. There is no core charge for this part. You can keep your original module, which can be helpful for future reference or diagnostics if needed.
What tools are needed for the post-installation procedures?
If the airbag light comes on or brake functions are affected, procedures like the ‘Setup SDM Primary Key in BCM’ or ‘Brake Pedal Position Relearn’ require a bi-directional professional diagnostic tool (like a Tech 2 or high-end Snap-on/Autel scanner). Many local repair shops can perform these relearns for you.
Will this fix my intermittent ‘no start’ condition?
It can. The BCM is a key part of the Passlock/Passkey vehicle security system. A failing 2003-2007 GM BCM can incorrectly believe the vehicle is being stolen and disable the fuel system, leading to a no-start or a start-and-stall condition.
Is this a difficult part to replace myself?
For someone with moderate mechanical skill, it’s a very achievable task. The primary challenge is usually accessing the module under the dash. Since our module comes pre-programmed, the most complex part of the job is already done for you.