Restore Full Functionality to Your GM Truck
Are you dealing with baffling electrical issues in your GMC Sierra or other GM truck? One day the power windows work, the next they don’t. The radio presets disappear, the HVAC blower motor has a mind of its own, or worse, you’re facing a no-start condition that leaves you stranded. As a technician with over two decades of experience, I’ve seen these exact symptoms hundreds of times, and they almost always point to a failing Body Control Module (BCM). This isn’t just an inconvenience; it’s the central command for your vehicle’s comfort and security features. This replacement module, equivalent to part number 25844480, is the definitive solution to get your truck back in order.
We solve the biggest headache of BCM replacement: programming. Forget expensive dealership visits and towing fees. We professionally program this module to your vehicle’s specific VIN before it ships. This ensures it communicates perfectly with your truck’s other systems right out of the box. This is the most reliable and cost-effective way to fix the widespread electrical problems common in these hard-working trucks.
A Technician’s Notebook: The Case of the Intermittent No-Start
A customer brought in his 2013 Sierra 3500 with a ghost of a problem: it would randomly refuse to start, but only after sitting in the sun for a few hours. The dash lights would flicker, and the security light would flash. He’d already replaced the battery and checked the alternator. After hooking up my scanner, I saw a slew of ‘loss of communication’ codes with the BCM. Instead of just swapping the part, I checked the main BCM ground connection under the dash. Sure enough, it was slightly loose and corroded. Heat expansion was just enough to break the connection. We cleaned the contact point, tightened it, and installed a new BCM. The problem never returned. It’s a powerful reminder: a new part works best with a solid foundation. Always check your grounds!
Is Your Truck Showing These Electrical Gremlins?
A failing BCM can cause a cascade of confusing issues. If your vehicle is experiencing any of the following, a faulty BCM is the likely culprit:
- ✔ Intermittent or non-working power windows, door locks, or interior lights.
- ✔ HVAC system failures, such as the blower motor not working or temperature controls being unresponsive.
- ✔ The security system acting erratically, causing no-start conditions or false alarms.
- ✔ An airbag warning light on the dash, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Unexplained battery drain or other persistent electrical shorts.
- ✔ Inconsistent wiper operation or other accessory malfunctions.
Your 5-Minute Path to a Perfect Fix
Installing your new 2013 Sierra 3500 BCM is a straightforward process that most DIYers can complete in under 15 minutes with basic tools. This module is designed for a direct fit, getting you back on the road without a trip to the shop.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the BCM: On most GM trucks and SUVs from this era, the BCM is located under the driver’s side dashboard, near the steering column. You may need to remove a lower dash panel for access.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs, so be gentle. Once disconnected, unclip or unbolt the module from its mounting bracket.
- Install the New Module: Seat the new, pre-programmed BCM into the mounting bracket and securely plug in all the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: lights, locks, windows, wipers, and the HVAC system.
- Post-Install Checks: In some cases, an airbag light may remain on. This requires a ‘Setup SDM Primary Key’ relearn procedure using a bi-directional scan tool. Similarly, a ‘Brake Pedal Position Relearn’ may be needed. These are simple procedures for any professional shop if you don’t have the tool.
Verified to Fit These GM Trucks & SUVs
This Body Control Module is a direct replacement for part numbers 25790508, 25835966, 20939137, 22860591, and others listed in the original description. It is confirmed to fit a wide range of vehicles, including:
- Cadillac Escalade, ESV, EXT (2007-2011)
- Chevrolet Avalanche 1500 (2007-2011)
- Chevrolet Silverado 1500, 2500, 3500 (2007-2013)
- Chevrolet Suburban 1500, 2500 (2007-2011)
- Chevrolet Tahoe (2007-2011)
- GMC Sierra 1500, 2500, 3500 & Denali Models (2007-2013)
- GMC Yukon & Yukon XL (2007-2011)
Note: Always verify your part number or consult the detailed fitment list to ensure perfect compatibility.
Do I need to take this BCM to the dealer for programming?
Do I need to take this BCM to the dealer for programming?
No. The single biggest benefit of our module is that we program it to your vehicle’s VIN before shipping. This makes the installation plug-and-play, saving you the time, cost, and hassle of a dealership visit.
Where is the BCM located on my 2013 GMC Sierra 3500?
The BCM is typically found under the driver’s side of the dashboard, usually attached to or near the steering column support. You may need to remove a plastic knee bolster panel to see it clearly.
What if my airbag light is still on after installation?
This is a common security feature. If the airbag light persists (often with code B1001), the Sensing and Diagnostic Module (SDM) needs to be synced with the new BCM. This is done via a ‘Setup SDM Primary Key in BCM’ procedure, which can be performed by any competent mechanic with a professional-grade scan tool.
Is there a core charge for this part?
No, there is absolutely no core charge. You can keep your old module without any obligation, making the process simpler and more convenient for you.
Will this fix my intermittent stalling or security light issues?
Yes, in many cases. The BCM is integral to the vehicle’s anti-theft and security system. A faulty BCM can fail to recognize the key or communicate properly, leading to security light illumination and no-start or stalling conditions. This programmed module is designed to resolve those communication errors.