If you’re dealing with baffling electrical issues in your 2003-2007 GMC Sierra 1500, you’re not alone. One day the power windows work, the next they don’t. The security light flashes randomly, or the HVAC controls have a mind of their own. These aren’t just minor annoyances; they’re classic signs of a failing Body Control Module (BCM). As the central command center for your truck’s body electronics, a faulty BCM can cause widespread and frustrating problems. This replacement BCM, part number 15137394, is the direct-fit, reliable solution to restore full functionality and peace of mind.
We take the guesswork and dealership hassle out of the equation. Each module is expertly programmed to your truck’s specific Vehicle Identification Number (VIN) before it ships. This means it arrives ready for a true plug-and-play installation, with no need for expensive trips to a mechanic for programming. It’s designed to communicate seamlessly with your truck’s other systems, resolving the root cause of many electrical DTCs right out of the box.
From the Diagnostic Bay: The No-Start That Wasn’t the Battery
I had a 2005 Sierra 1500 towed to my shop once with a classic no-start complaint. The owner had already replaced the battery and checked the starter, but the engine wouldn’t crank, and the security light was blinking on the dash. A quick scan revealed a B1001 DTC and communication errors with the BCM. The BCM’s internal security logic had failed, preventing it from sending the ‘all clear’ signal to the powertrain control module. We swapped in a VIN-programmed BCM, and the truck fired right up. It’s a textbook example of how a failing 2003-2007 Sierra 1500 BCM can mimic other, more common failures.
Is Your Sierra Showing These Electrical Faults?
A failing BCM can manifest in numerous ways. If your truck is experiencing any of the following, this module is the likely solution:
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ HVAC blower motor or climate controls not working correctly.
- ✔ The security system acting up, causing a no-start or no-crank condition.
- ✔ An airbag warning light that won’t turn off, often with a B1001 code.
- ✔ Inconsistent operation of interior or exterior lights.
- ✔ A variety of communication-related Diagnostic Trouble Codes (DTCs).
A Straightforward Guide to Installation
Replacing the BCM is a job most DIYers can handle in their own driveway in just a few minutes. The module is typically located under the driver’s side dash, near the steering column.
- Safety First: Always disconnect the negative terminal from your truck’s battery before starting any electrical work.
- Locate the Module: Find the BCM under the steering column. It will have several large multi-pin connectors attached to it.
- Swap the Part: Carefully unplug the electrical connectors and remove the old module. It’s often held in place by simple clips or a few small bolts. Install the new BCM in its place and securely reconnect all plugs.
- Reconnect Power: Re-attach the negative battery terminal. The system will power up with the new, pre-programmed module.
- Final Checks: Start the vehicle and test all functions—lights, locks, windows, wipers, and HVAC—to confirm the repair. Note that some post-install procedures, like an airbag system sync, may be needed in specific cases.
Verified Fitment For Your GM Truck or SUV
This module is a direct replacement for part number 15137394 and is interchangeable with several other part numbers, ensuring broad compatibility. It is engineered to fit a wide range of GM trucks and SUVs, including the specified 2003-2007 Sierra 1500 BCM. See the detailed list below for specific models and options.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means we load your truck’s unique VIN into the BCM before shipping. This ensures it works perfectly with your vehicle’s specific options and security system right out of the box, eliminating the need for a dealership visit for programming.
Do I need to return my old BCM? (Core Charge)
No, there is absolutely no core charge. You can keep your old part, so there’s no hassle with packaging and shipping a return.
My airbag light is on after installing the new BCM. What should I do?
This is a known possibility. The BCM and the airbag system (SDM) need to be synced. A professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure to clear the light. This is only necessary if the light appears after installation.
Is this a difficult part to install myself?
Not at all. For most owners, this is a simple plug-and-play repair that takes less than 15 minutes with basic tools. The module is easily accessible under the driver’s side dashboard.
Will this fix my truck’s no-start problem?
If the no-start is caused by the factory anti-theft system being triggered by a faulty BCM, then yes, this part is designed to resolve that issue. A blinking security light is a strong indicator of this problem.