Restore Full Electrical Function to Your GM Truck or SUV
Are you battling frustrating electrical problems in your Chevrolet Silverado, GMC Sierra, or Tahoe? Intermittent wipers, flickering lights, unresponsive power windows, or a malfunctioning security system are common signs of a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it fails, it can cause a cascade of confusing issues. This genuine quality GM BCM, interchangeable with part number 15901388, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play installation.
We once had a 2011 Silverado 2500 in the shop with a whole host of bizarre electrical issues—the radio would cut out, the dome light wouldn’t work, and the power locks were sporadic. The customer was convinced he needed a new BCM. Before ordering the part, we did a full diagnostic check and found a corroded ground strap under the driver’s side door sill. After cleaning the connection point and re-securing the ground, all the issues vanished. While a faulty BCM was a likely culprit, a 15-minute check of the main grounding points saved the customer hundreds. Always check your grounds before replacing a module!
Common Symptoms of a Failing BCM
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights failing to turn on or off correctly.
- ✔ HVAC system controls becoming unresponsive or the blower motor working intermittently.
- ✔ The vehicle’s security system malfunctioning, causing starting issues or false alarms.
- ✔ An illuminated airbag warning light, often with diagnostic trouble code (DTC) B1001.
- ✔ Unexplained battery drain while the vehicle is parked.
- ✔ Wipers behaving erratically or not responding to controls.
Why Choose Our Programmed Sierra 3500 Body Control Module?
This isn’t just a replacement part; it’s a complete, hassle-free solution. We take the guesswork and expensive dealership visits out of the equation. By programming the module to your vehicle’s VIN before it ships, we ensure that it integrates seamlessly with your existing systems. It arrives ready to install, loaded with the latest GM software updates to correct known issues and optimize performance. This process restores factory functionality without the need for expensive scan tools or programming subscriptions.
Installation and Post-Install Considerations
Physically installing the BCM is straightforward for most DIY mechanics. It’s typically located under the driver’s side dashboard, near the steering column, and can be swapped in minutes. However, please be aware of a potential post-installation step. If your airbag warning light illuminates after the new BCM is installed, a procedure called “Setup SDM Primary Key in BCM” is required. This is not a defect in the module but a necessary security handshake between the new BCM and the airbag system’s Sensing and Diagnostic Module (SDM). This procedure must be performed with a professional-grade diagnostic tool.
Frequently Asked Questions
Is this BCM truly plug-and-play?
Yes, for most functions. We pre-program it with your vehicle’s VIN, so it will control the lights, locks, windows, and other core features immediately. The only exception is the potential need to sync it with the airbag module (SDM) if the airbag light appears, which requires a professional scan tool.
What if my airbag light is on after installation?
This is a normal security procedure for many GM vehicles. You will need to have a qualified technician perform the “Setup SDM Primary Key in BCM” function with a high-level scan tool to sync the modules and turn off the light.
Do I need to send my old BCM back?
No. This product has no core charge. You can keep your old part, which saves you the time and expense of return shipping.
How do I know for sure that my BCM is the problem?
The best way to be certain is with a proper diagnosis from a professional technician. However, if you are experiencing multiple, unrelated electrical issues from the symptom list above, a failing BCM is a very common cause on these GM trucks and SUVs.
Will this fit my 2012 Silverado if the part number is different?
This module is interchangeable with a wide range of part numbers, including 25844480, 25835966, and 20939137. Please check the extensive fitment list on this page or contact us with your VIN to confirm compatibility for your specific vehicle.