Tired of Chasing Electrical Gremlins in Your GM Truck?
If your 2003-2007 GMC Sierra 3500 is acting possessed—with flickering lights, a dead A/C blower, or power locks with a mind of their own—you’re not alone. These frustrating, intermittent issues often point to one culprit: a failing Body Control Module (BCM). As the electronic nerve center for your truck’s comfort and convenience features, when the BCM goes bad, it can create a cascade of problems that are maddening to diagnose. This replacement BCM, part number 15116066, is the definitive solution to restore order and full functionality to your vehicle.
What makes this part special is our included Cloning Service. Simply send us your original module, and we’ll transfer all the critical vehicle-specific data to this replacement unit. The result? A truly plug-and-play module that requires no expensive trip to the dealership for programming. It arrives at your door ready for immediate installation, saving you time, money, and headaches.
A Technician’s Notebook: The Money Pit of Misdiagnosis
I once had a 2006 Silverado 2500 in my bay where the owner had spent nearly $800 chasing an intermittent A/C blower. He’d replaced the blower motor, the resistor, and even the dash control head. Nothing worked. The blower would work for a week, then quit for three days. After five minutes of checking data stream with my scan tool, I saw the BCM wasn’t sending the ‘on’ command. The internal relay was failing. We installed a cloned 2003-2007 Sierra 3500 BCM, and the problem was solved in minutes. This part prevents that costly guesswork by addressing the root cause directly.
Is Your Truck Exhibiting These Classic BCM Failure Signs?
- ✔ The A/C or heater blower motor works intermittently or not at all.
- ✔ Power windows, door locks, or interior lights operate erratically or have failed completely.
- ✔ Your anti-theft or security system is malfunctioning, causing a no-start condition.
- ✔ The airbag warning light is illuminated, often with a DTC like B1001 (Option Configuration Error).
- ✔ You’re seeing a host of other communication or body-related trouble codes.
Your 5-Minute BCM Installation Guide
Installing your new BCM is a straightforward process that most DIYers can complete with basic tools. In most GM trucks and SUVs, it’s located right under the driver-side dashboard.
- Step 1: Safety First. Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Step 2: Locate the BCM. On most models like the Sierra and Silverado, it’s a black box with several large connectors located under the steering column.
- Step 3: Disconnect and Remove. Carefully release the locking tabs on the electrical connectors and pull them straight out. Then, unclip or unbolt the module from its mounting bracket.
- Step 4: Install the New Module. Snap the replacement BCM into the bracket and firmly reconnect all the electrical harnesses. You’ll hear a click as they lock into place.
- Step 5: Reconnect and Test. Reattach the negative battery terminal. Start the vehicle and test all functions—lights, locks, windows, HVAC, etc.—to confirm the repair.
Post-Installation Note: In some cases, you may need a professional scan tool to perform an “SDM Primary Key Setup” if the airbag light remains on, or a “Brake Pedal Position Relearn.” This is vehicle-dependent. This 2003-2007 Sierra 3500 BCM is designed to make the process as simple as possible.
Verified Fitment for Your GM Truck or SUV
This module is a direct replacement for part number 15116066 and is interchangeable with several other part numbers, including 10383536, 15136225, 15137393, and 15198116. It fits a wide range of popular GM vehicles, including:
- ✔ 2003-2007 Chevrolet Silverado & GMC Sierra 1500/2500/3500
- ✔ 2003-2006 Chevrolet Tahoe, Suburban & GMC Yukon/Yukon XL
- ✔ 2003-2006 Cadillac Escalade, ESV, EXT
- ✔ 2003-2007 Hummer H2
- ✔ 2004-2007 Chevrolet Express & GMC Savana Vans (with opt PRP)
- ✔ 2002-2006 Chevrolet Avalanche 1500/2500
Please verify your specific model and options in our detailed fitment list to ensure perfect compatibility.
Frequently Asked Questions
How does the Cloning Service work?
After you place your order, we will provide you with shipping instructions to send us your original BCM. We then use specialized equipment to read the vehicle-specific data from your old module and write it directly onto the new one. This ensures all your vehicle’s options and security information are preserved, making the new module plug-and-play.
Do I need any special tools for installation?
No, basic hand tools are all that’s required for the physical installation. In rare cases, a post-installation procedure like an airbag system sync may be needed, which requires a professional-grade scan tool. However, for most users, no further steps are necessary.
What happens to my old BCM? Is there a core charge?
There is no core charge. We always return your original module to you along with the newly programmed replacement. You can keep it or dispose of it as you see fit.
Will this fix my airbag light with code B1001?
A faulty BCM is a very common cause of a B1001 code. Replacing the module with our cloned unit should resolve the issue. If the light stays on after installation, performing the ‘Setup SDM Primary Key in BCM’ procedure with a scan tool will sync the systems and turn off the light.
How can I be sure this is the part I need?
The symptoms listed are strong indicators of BCM failure. For 100% certainty, a professional diagnosis is recommended. You can also match the part number on your original module to 15116066 or one of the interchangeable numbers listed.