Tired of Unpredictable Electrical Problems in Your GM Truck?
If you’re dealing with flickering lights, a dead HVAC system, or power windows with a mind of their own, you’re likely facing a failing Body Control Module (BCM). As the central command for your truck’s body electronics, a faulty BCM can cause a cascade of frustrating and hard-to-diagnose issues. This OEM-quality module, equivalent to part number 25844480, is the definitive solution for your 2011 Sierra Denali 3500 BCM and a wide range of other GM trucks and SUVs. We take the guesswork and high dealership costs out of the equation by programming it to your vehicle’s specific VIN before it ships.
A Technician’s Notebook: The Intermittent Gremlin
I once had a 2011 Sierra 2500 in my bay that was driving the owner crazy. The radio would cut out, the dome light would stay on, and occasionally the truck would refuse to start. He’d replaced the battery and checked the alternator, but the problems persisted. After hooking up my scanner, I saw a handful of communication codes but nothing consistent. From years of experience, I knew to check the BCM grounds first. Sure enough, the main ground point under the dash was slightly loose and corroded. We replaced the BCM since the intermittent power had likely damaged it, cleaned the ground point meticulously, and the truck has been running flawlessly since. This is why I always tell my customers: when you replace a BCM, always inspect your grounds—it’s the five minutes of prevention that saves you from a repeat failure.
Is Your Truck Showing These Symptoms?
- ✔ Power windows, mirrors, or door locks operating erratically or not at all.
- ✔ HVAC controls are unresponsive, or the blower motor works intermittently.
- ✔ The security system acts up, causing no-start conditions or false alarms.
- ✔ An airbag warning light is illuminated on the dash, often with a DTC like B1001.
- ✔ Headlights, taillights, or interior lights flicker or fail to turn on/off correctly.
- ✔ Unexplained battery drain when the vehicle is off.
Your 5-Minute Path to a Fully Functional Truck
Installing your new BCM is a straightforward process that most DIYers can complete in their driveway. No complex wiring, no special tools needed.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronics.
- Locate the BCM: On most GM trucks and SUVs from this era, the BCM is located under the driver’s side of the dashboard, near the steering column. It’s a black box with several large electrical connectors.
- Swap the Module: Carefully unplug the electrical connectors from the old BCM. They have locking tabs, so be sure to depress them fully. Unbolt or unclip the old module and set it aside. Mount the new module in its place.
- Reconnect and Power Up: Firmly plug the connectors into your new, VIN-programmed BCM. Reconnect the negative battery terminal.
- Post-Installation Checks: Start the vehicle and test all body functions—lights, locks, windows, wipers, and HVAC. In most cases, you’re done! However, if your airbag light remains on, a ‘Setup SDM Primary Key in BCM’ procedure may be needed using a professional scan tool. Some models may also require a ‘Brake Pedal Position Relearn’.
This module is a direct replacement for multiple part numbers, including: 25835966, 15263363, 15263497, 15878753, 15284816, 15943678, 15926094, 15940214, 25790508, 25790509, 25823558, 25823559, 25835965, 25844479, 25971916, 25971917, 15901388, 20939137, 20939138, and 22860591.
Verified Vehicle Compatibility
This Body Control Module is a guaranteed fit for a wide range of General Motors vehicles from 2007 to 2013. Please verify your specific model and year from the list below.
CHEVROLET SILVERADO 1500/2500/3500 (2007-2013)
CHEVROLET SUBURBAN 1500/2500 (2007-2011)
CHEVROLET TAHOE (2007-2011)
GMC SIERRA 1500/2500/3500 (2007-2013)
GMC SIERRA DENALI 1500/2500/3500 (2007-2013)
GMC YUKON & YUKON XL 1500/2500 (2007-2011)
CADILLAC ESCALADE, ESV, EXT (2007-2011)
Frequently Asked Questions
Frequently Asked Questions
Do I need to get this BCM programmed by a dealer?
No. We program the module to your vehicle’s VIN before shipping. It arrives ready for plug-and-play installation, saving you time and the high cost of dealership programming.
What if my airbag light is still on after installation?
This is a common security feature. If the light persists, a technician will need to use a professional scan tool to perform a quick ‘Setup SDM Primary Key in BCM’ procedure to sync the airbag system with the new BCM.
Is there a core charge for my old part?
Absolutely not. There is no core charge, and you do not need to send your old module back to us. You can keep it or dispose of it at your convenience.
How can I be sure the BCM is the real problem?
While a professional diagnosis is always best, a failing BCM is the most common cause for multiple, unrelated electrical failures (like windows, locks, and radio all acting up). If you’re experiencing several symptoms from our list, the BCM is the most likely culprit.
Where is the BCM located on my 2011 Sierra Denali 3500?
The BCM is located under the dashboard on the driver’s side, typically to the left of the steering column. It is a black plastic module with three or more large wiring harnesses connected to it.