Solve Your Truck’s Electrical Gremlins for Good
If you’re dealing with baffling electrical issues in your 2003-2007 GMC Sierra 3500 or other compatible GM truck, a failing Body Control Module (BCM) is often the culprit. As the central command for your vehicle’s comfort and security features, a faulty BCM can cause a cascade of problems, from flickering lights and a dead HVAC system to frustrating no-start conditions. This isn’t just an annoyance; for a workhorse truck like a Sierra 3500, it’s a reliability issue that can cost you time and money. This replacement module, part number 15137394, is the definitive solution to restore full functionality and peace of mind.
Case Study: A Tricky Diagnosis
I remember a 2006 Sierra 3500 dually that came into my shop with the most bizarre symptoms. The owner, a contractor, said the radio would randomly switch off, the driver’s side power window worked intermittently, and sometimes the security light would stay on, preventing the truck from starting. He’d already replaced the battery and checked the main grounds. After hooking up my scan tool, I saw a handful of communication loss codes (U-codes) pointing to the BCM. These modules can fail internally, causing unpredictable behavior across different systems. We used our cloning service to transfer the data to a replacement unit, and the truck was back to being a reliable workhorse the same afternoon. No dealer trip, no programming headaches.
The Power of Our Cloning Service
Forget expensive dealership visits and the hassle of programming a new module. Our unique Cloning Service makes this repair straightforward for any DIY enthusiast or professional mechanic. Simply send us your original BCM, and we will perform a precise, bench-tested transfer of all your vehicle-specific data—including VIN, mileage, and key information—onto this replacement unit. The module you receive back will be 100% plug-and-play. This process ensures seamless integration with your truck’s existing electronic systems, making it the most efficient way to fix your 2003-2007 Sierra 3500 BCM.
Is Your Sierra Exhibiting These Electrical Issues?
- ✔ Power windows, door locks, or interior lights operating erratically or not at all.
- ✔ The security system acting up, causing a no-start condition or false alarms.
- ✔ HVAC controls are unresponsive, or the blower motor works intermittently.
- ✔ An airbag light that won’t turn off, often accompanied by DTC B1001.
- ✔ A cluster of seemingly unrelated diagnostic trouble codes (DTCs) stored in the system.
- ✔ Unpredictable behavior from windshield wipers or exterior lighting.
A Straightforward Guide to BCM Installation
- ✔ Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the Module: On most GM trucks and SUVs of this era, the BCM is located under the driver’s side of the dashboard, near the steering column.
- ✔ Remove Connectors: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed.
- ✔ Swap the Module: Unbolt or unclip the old BCM and remove it. Install the new, cloned module in its place.
- ✔ Reconnect Everything: Plug the electrical connectors firmly into the new module and reconnect the vehicle’s battery.
- ✔ Final Check: Start the vehicle and test all body functions (lights, locks, windows, HVAC) to confirm the repair. Note that some post-install procedures may be required in specific cases (see our FAQ).
Verified Fitment for Your GM Truck or SUV
This BCM is a direct replacement for part number 15137394 and is interchangeable with several other part numbers, including 15116066, 15136225, and 15198116. It is designed for a wide range of General Motors vehicles. While this is a common solution for a 2003-2007 Sierra 3500 BCM failure, please verify fitment for your specific model below.
SILVERADO 1500/2500/3500 PICKUP 03-07 (Classic Style)
SUBURBAN 1500/2500 03-06
TAHOE 03-06
EXPRESS 1500/2500/3500 VAN 04-07 (w/ opt PRP)
SIERRA 1500/2500/3500 PICKUP 03-07 (Classic Style)
SIERRA DENALI 03-07 (Classic Style)
YUKON & YUKON XL 1500/2500 03-06
SAVANA 1500/2500/3500 VAN 04-07 (w/ opt PRP)
CADILLAC ESCALADE, ESV, EXT 03-06
HUMMER H2 03-07
Frequently Asked Questions
Frequently Asked Questions
How does the Cloning Service work?
After you place your order, you will receive instructions on how to ship your original BCM to us. Our technicians will then extract the data from your module and flash it onto the replacement unit. We ship both your original module and the ready-to-install replacement back to you.
Do I need any special tools for installation?
Basic hand tools for removing dash panels and a socket to disconnect the battery are all that’s typically required. The installation itself is plug-and-play. However, in the rare event an airbag light appears, a professional scan tool is needed for the SDM key sync procedure.
What happens to my old BCM?
Your original module is always returned to you along with the newly programmed replacement. We do not require a core, so you can keep your old part.
Will this fix my airbag light with code B1001?
A faulty BCM is a very common cause of a B1001 code and an illuminated airbag light. Replacing it with our cloned module should resolve the issue. If the light remains on after installation, the ‘Setup SDM Primary Key in BCM’ procedure will be necessary to sync the systems.
Is this part guaranteed to work?
Absolutely. We test the data transfer and module function before shipping it back to you. This part is also backed by our standard warranty, giving you confidence in your repair of the 2003-2007 Sierra 3500 BCM.