Restore Full Electrical Function to Your GM Truck or SUV
Are you battling frustrating electrical gremlins in your 2013 GMC Sierra Denali 2500? Flickering lights, unresponsive power windows, or a malfunctioning security system are common signs of a failing Body Control Module (BCM). This genuine GM BCM, part number 25844479 (interchangeable with 25844480), is the definitive solution. We pre-program it to your vehicle’s specific VIN, ensuring a seamless, plug-and-play installation that restores your truck’s electronic systems to factory-perfect operation without a costly trip to the dealership.
Common Symptoms of a Failing BCM
- ✔ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔ Interior or exterior lights staying on, flickering, or failing to activate.
- ✔ HVAC and climate control systems behaving erratically or blower motor failure.
- ✔ Vehicle security system malfunctions, causing no-start conditions or false alarms.
- ✔ An illuminated airbag warning light, often accompanied by DTC B1001.
- ✔ Unexplained battery drain while the vehicle is parked.
The Plug-and-Play Solution for Your 2013 Sierra Denali BCM
The biggest hurdle in replacing a BCM is the need for expensive, specialized programming. We eliminate that step entirely. By providing your vehicle’s VIN during checkout, you receive a module that is loaded with the latest GM software and calibrated specifically for your truck’s options and features. This makes the installation straightforward, allowing you to get back on the road quickly. This module is a direct replacement for a wide range of part numbers, including 25835966, 15943678, 20939137, 22860591, and more.
Installation and Post-Install Procedures
Physically installing the BCM is simple. It is typically located under the driver’s side dashboard, near the steering column, and can be swapped in minutes. However, be aware of potential post-installation steps:
- Airbag System Sync: If the airbag warning light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure is required. This must be done with a professional-grade scan tool to sync the new BCM with the airbag system.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor relearn to ensure proper brake light and stability control function.
Always consult a factory service manual for your specific vehicle. And remember, there is no core charge—you can keep your old part.
Frequently Asked Questions
What does a BCM do on a 2013 GMC Sierra?
The Body Control Module acts as the central computer for your truck’s body electronics. It manages non-engine related functions like power windows, door locks, interior/exterior lighting, the security system, wipers, and HVAC controls.
Is this BCM ready to install out of the box?
Yes! This module is fully pre-programmed to your vehicle’s VIN before shipping. This makes it a true plug-and-play solution, requiring no additional dealership programming for standard operation.
What if my airbag light is on after installation?
An airbag light after install is usually due to the new BCM needing to be electronically ‘introduced’ to the airbag’s Sensing and Diagnostic Module (SDM). A technician with a high-level scan tool will need to perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.
Do I need to return my old BCM?
No. There is no core charge for this part. You can keep your original module without any extra fees or hassle.
Where is the BCM located on my truck?
On most 2007-2013 GM trucks and SUVs, including the Sierra, Silverado, and Tahoe, the BCM is located under the driver’s side dashboard, typically to the left of the steering column.