Solve Persistent Electrical Problems in Your GM Truck
If you’re dealing with baffling electrical issues in your 2013 GMC Sierra 3500 or another compatible GM truck, a failing Body Control Module (BCM) is often the culprit. As the central command for your vehicle’s body electronics, a faulty BCM can cause a cascade of problems, from non-responsive power windows and door locks to erratic HVAC behavior and even no-start conditions. This replacement BCM, part number 15901388, is the definitive solution, restored to OEM standards and delivered with our expert Cloning Service for a true plug-and-play repair.
Forget about expensive dealership visits and the hassle of programming. We transfer the critical data from your original module directly to this replacement unit. This ensures that all your vehicle’s specific settings, security information, and options are preserved. The result is a seamless installation that gets your truck back to full operational health without any extra steps.
A Technician’s Notebook: The Case of the Haunted Sierra
I had a 2013 Sierra 3500 in the bay last month that was driving its owner crazy. The radio would randomly shut off, the dome light flickered, and occasionally, the truck wouldn’t start, just a click. He’d already replaced the battery and checked the main grounds. After hooking up my scanner, I saw a handful of U-codes (communication errors) and a B1001 for the airbag system. This pointed directly to the BCM. A failing BCM can disrupt the entire CAN bus network, making other modules act erratically. We swapped in a cloned BCM, and every single issue vanished. It’s a perfect example of how one part can be the root of many seemingly unrelated symptoms.
Diagnosing a Faulty 2013 Sierra 3500 BCM
A failing BCM doesn’t always trigger a check engine light, making it tricky to diagnose. Instead, it manifests as a collection of annoying and often intermittent electrical failures. If your truck is experiencing these issues, it’s time to consider the BCM.
- ✔ Non-functional or erratic power accessories (windows, locks, mirrors).
- ✔ HVAC controls not working or blower motor stuck on one speed.
- ✔ Headlights, taillights, or interior lights staying on or not turning on at all.
- ✔ An active anti-theft system that prevents the engine from starting.
- ✔ Airbag light illuminated on the dash, often with DTC B1001.
- ✔ Communication error codes (U-codes) stored in various modules.
Your 5-Minute BCM Swap Guide
This is a repair that most DIYers can confidently tackle in their own driveway. The BCM is typically located in an accessible spot, making the physical swap quick and simple.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the Module: On most GM trucks and SUVs, you’ll find the BCM under the driver’s side of the dashboard, near the steering column.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs, so be gentle. Once disconnected, unclip or unbolt the old BCM and remove it.
- Install the New BCM: Seat the new, cloned module in place and securely reconnect all electrical harnesses. You should hear a click as they lock.
- Reconnect Power: Reattach the negative battery terminal. Your vehicle’s systems will now recognize the cloned module as the original.
- Final Checks: Start the vehicle and test all functions controlled by the BCM—lights, locks, windows, wipers, and HVAC—to confirm the repair was successful. Note: Some models may require post-install procedures as detailed in our FAQs.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15901388 and is interchangeable with several other part numbers. It is guaranteed to fit the following vehicles. Please verify your part number or contact us for assistance.
Note: For 2007 models, this fits the ‘new style’ with a smooth door skin. For some 2010 and 2013 models, fitment may depend on matching ID 25835966.
Frequently Asked Questions
What is a Cloning Service?
Cloning is a process where we transfer the essential software and vehicle-specific data (like VIN, mileage, and security keys) from your original BCM to the replacement unit. This makes the new module a perfect electronic match for your truck, eliminating the need for dealership programming.
Do I need to send my original BCM to you?
Yes. For the cloning service to work, we need your original module to extract the data. We will return your original part along with the newly programmed replacement. We do not keep cores.
Will this fix my airbag light?
In many cases, yes, especially if the light is caused by a BCM-related code like B1001. However, if the light remains on after installation, a simple ‘Setup SDM Primary Key in BCM’ procedure with a professional scan tool will be required to sync the airbag system.
Is any special relearn procedure needed after installation?
Sometimes. Depending on your specific model, a Brake Pedal Position (BPP) sensor relearn might be necessary to ensure proper brake light and stability control function. This can be done with most bi-directional scan tools.
What if my original module is completely dead or missing?
If your original module is unreadable (e.g., water or fire damage) or lost, we cannot perform the cloning service. Please contact our support team to discuss other potential solutions.
What is the warranty on this part?
This Body Control Module comes with a one-year warranty, giving you confidence and peace of mind in your repair.