Restore Full Electrical Function to Your GM Truck or SUV
Is your GMC Sierra, Chevrolet Silverado, or Tahoe plagued by strange and unpredictable electrical issues? A failing Body Control Module (BCM) is often the culprit. The BCM acts as the central nervous system for your vehicle’s body electronics, managing everything from your power windows and door locks to the HVAC system and interior lights. When it begins to fail, it can cause a cascade of frustrating problems that can be difficult to diagnose. This OEM-quality replacement BCM, part number 15284816 (interchangeable with 25844480 and others), is the definitive solution to restore your vehicle’s performance and reliability.
From the Diagnostic Bay
We recently had a 2011 Silverado 2500 in the shop with a classic case of BCM failure. The customer complained that the radio would turn on and off by itself, the driver’s side power window worked intermittently, and the airbag light was on. Initially, they suspected a bad ground or a faulty window switch. After checking the main grounding points and finding no issues, we scanned the vehicle and pulled a B1001 code related to the SDM (airbag module) configuration. This pointed us directly to the BCM. Instead of a complex wiring chase, a new, pre-programmed GMC Sierra Body Control Module was the simple, effective fix. The new module resolved all the electrical gremlins in under 10 minutes of installation time.
Common Symptoms of a Failing BCM
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights (headlights, dome lights) failing to turn on or off.
- ✔ HVAC controls becoming unresponsive or the blower motor working intermittently.
- ✔ The security system malfunctioning, leading to no-start conditions or false alarms.
- ✔ An illuminated airbag warning light on the dashboard, often with DTC B1001.
- ✔ Unexplained battery drain while the vehicle is parked.
- ✔ Communication errors with other modules stored in the vehicle’s computer.
The Plug-and-Play Advantage: Pre-Programmed for Your VIN
Replacing a BCM used to require a trip to the dealership for expensive and time-consuming programming. Our modules eliminate that step entirely. We pre-program this unit to your vehicle’s specific Vehicle Identification Number (VIN) before shipping. This ensures that it communicates flawlessly with your truck’s existing systems right out of the box. It arrives loaded with the latest GM software updates for optimal performance and compatibility. This is the most efficient way to get your truck back to perfect working order without extra hassle.
Installation and Post-Install Notes
The GMC Sierra Body Control Module is typically located under the driver’s side dashboard, near the steering column, making for a straightforward replacement. In most cases, the process is plug-and-play. However, please be aware of these potential post-installation procedures:
- Airbag System Sync: If the airbag warning light remains on after installation, a technician will need to perform the “Setup SDM Primary Key in BCM” procedure using a professional-grade scan tool. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor relearn to ensure correct brake light and traction control operation.
This module is a direct replacement for part numbers: 25835966, 15263363, 15263497, 15878753, 15284816, 15943678, 15926094, 15940214, 25790508, 25790509, 25823558, 25823559, 25835965, 25844479, 25971916, 25971917, 15901388, 20939137, 20939138, 22860591.
Frequently Asked Questions
What does a Body Control Module do on a GMC Sierra?
The BCM is a computer that controls and monitors most of your truck’s non-engine related electronic functions, including power windows, locks, lights, wipers, security system, and the climate control system.
Is this BCM ready to install out of the box?
Yes. We program the module to your vehicle’s VIN before it ships, making it a true plug-and-play solution. No dealership visit is required for programming.
Where is the BCM located on a 2013 Sierra 2500?
The BCM is located inside the cabin, under the driver’s side of the dashboard, usually near the steering column. It’s typically accessible by removing the lower dash panel.
Will this fix my airbag light with a B1001 code?
A faulty BCM is a very common cause for the B1001 code. Replacing it often resolves the issue, but you may need to perform the ‘Setup SDM Primary Key’ procedure with a scan tool after installation to clear the light.
Do I need to return my old BCM?
No, there is no core charge for this part. You can keep your old module without any additional fees or hassle.