Restore Full Control Over Your Truck’s Electronics
If your GMC Sierra or other GM truck is plagued by bizarre electrical issues—like dashboard lights flickering, power windows refusing to work, or the A/C acting up—the Body Control Module (BCM) is the likely culprit. As the central command for your vehicle’s body electronics, a failing BCM can create a cascade of frustrating problems. This OEM-quality replacement, part number 15901388, comes expertly VIN-programmed to your specific vehicle, offering a direct, hassle-free solution to get your truck back to 100% functionality.
Is Your Truck Showing These Symptoms?
A faulty BCM can manifest in numerous ways. From my 20+ years of experience, these are the most common signs that point directly to a BCM failure, especially in the GMT900 platform trucks and SUVs:
- ✔ Unresponsive or erratic HVAC controls, including a blower motor that works intermittently or not at all.
- ✔ An illuminated airbag warning light, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Power accessories failing, such as door locks that won’t engage, windows that are stuck, or interior/exterior lights acting possessed.
- ✔ Security system malfunctions, leading to no-start conditions, random stalling, or misfires that seem unrelated to the engine.
- ✔ A cluster of seemingly random communication codes (U-codes) or body-related DTCs stored in the system.
Case Study: A Tricky Diagnosis
A customer brought in a 2011 Silverado 2500 with a persistent airbag light and intermittent stalling. They had already replaced the battery and checked all the main ground points. The scanner showed a B1001 code and a few U-codes for lost communication. While these symptoms can point to wiring issues, I’ve seen this exact pattern hundreds of times. The internal circuitry of the original BCM becomes weak, causing voltage drops and data corruption that mimics a bad ground or a failing sensor. We installed a VIN-programmed BCM, performed the quick SDM key sync, and cleared the codes. The truck ran perfectly, and the airbag light was gone for good. It saved the customer hours of chasing phantom electrical gremlins.
A Straightforward Guide to Installation
One of the best features of this module is its simple, plug-and-play installation. No dealership visit is required for programming. For most DIYers or professional technicians, this is a 5-minute job.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on electrical components.
- Locate the BCM: On most compatible models, including the 2011 Sierra Denali 1500, 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.
- Swap the Module: The BCM is held in place by retaining clips. Carefully disconnect the electrical connectors (they have locking tabs, so don’t just pull). Unclip the old module and clip the new one into place.
- Reconnect and Test: Securely plug all connectors into your new BCM. Reconnect the battery terminal. Start the vehicle and test all functions: lights, wipers, locks, windows, and HVAC to confirm the repair.
- Post-Install Check: In some cases, an airbag light may persist. This is normal and requires a ‘Setup SDM Primary Key’ procedure using a capable bi-directional scan tool. This syncs the new BCM with the airbag system. A brake pedal position relearn may also be necessary for certain models.
Verified Vehicle Compatibility for Part 15901388
This Body Control Module is a direct-fit replacement for a wide range of General Motors trucks and SUVs. It is interchangeable with part numbers 25844480, 25835966, 15901388, 20939137, 22860591, and many more. Please confirm your model and year below:
- Avalanche 1500 (2007-2011)
- Silverado 1500 (2007-2011)
- Silverado 2500/3500 (2007-2013)
- Suburban 1500/2500 (2007-2011)
- Tahoe (2007-2011)
- Sierra 1500 (2007-2011)
- Sierra 2500/3500 (2007-2013)
- Sierra Denali (2007-2013)
- Yukon / Yukon XL (2007-2011)
- Escalade / ESV / EXT (2007-2011)
Frequently Asked Questions
Is this part truly plug-and-play?
Yes. We program the module to your vehicle’s VIN before shipping. This ensures it communicates correctly with your truck’s other systems right out of the box, with no need for expensive dealership programming.
What if my airbag light is still on after installation?
This is a common and expected situation on some vehicles. It simply means the new BCM needs to be electronically ‘introduced’ to the airbag system (SDM). A mechanic with a bi-directional scan tool can perform the ‘Setup SDM Primary Key in BCM’ function in a few minutes to resolve this.
Do I need to return my old BCM?
No. There is absolutely no core charge for this part. You can keep your old module or dispose of it responsibly.
How can I be sure the BCM is my problem?
The most reliable way is a professional diagnosis. However, if you’re experiencing multiple, unrelated electrical issues from the symptoms list (e.g., faulty windows, erratic HVAC, and security light), the BCM is the most probable cause.
What tools are required for the job?
For the physical installation, you’ll likely only need a basic socket set or a trim removal tool to access the lower dash panel. A professional scan tool is only needed if you have to perform a post-install procedure like the airbag system sync.