Restore Full Electrical Function to Your GM Truck or SUV
Are you battling frustrating electrical problems in your vehicle? Flickering lights, unresponsive power windows, a malfunctioning security system, or an HVAC system with a mind of its own are common signs of a failing Body Control Module (BCM). This genuine GM BCM, part number 25844480, is the definitive solution for a wide range of 2007-2013 GM trucks and SUVs, including the Chevrolet Silverado, GMC Sierra, Tahoe, and Escalade. We pre-program this module to your vehicle’s specific VIN, ensuring a seamless, plug-and-play installation without requiring a trip to the dealership for expensive programming.
From the Diagnostic Bay
We had a 2013 Sierra Denali 2500 in the shop that was driving its owner crazy. The radio would turn on and off, the driver’s side power lock was intermittent, and the climate control blower would only work on high. The owner had already replaced the blower motor resistor and the door lock actuator with no success. After a quick scan, we saw multiple communication codes pointing to a network issue. The culprit? A failing BCM. Instead of chasing individual components, replacing the BCM with a VIN-programmed unit like this one solved all the electrical gremlins at once, saving the customer time and money.
Common Symptoms of a Failing BCM
- ✔ Unresponsive or erratic power windows, door locks, and interior/exterior lights.
- ✔ HVAC system failures, such as a blower motor that won’t turn on or is stuck on one speed.
- ✔ Illuminated airbag warning light, often with a DTC B1001 (Setup SDM Primary Key in BCM).
- ✔ Security system malfunctions, including random alarm activation or no-start conditions.
- ✔ Intermittent stalling, misfires, or strange instrument cluster behavior due to grounding issues within the module.
- ✔ A variety of communication-related Diagnostic Trouble Codes (DTCs).
Your Direct-Fit 2013 Sierra Denali BCM Solution
This module is the central command center for your vehicle’s body electronics. When it fails, it can create a cascade of seemingly unrelated issues. Our professionally programmed 2013 Sierra Denali BCM restores the precise factory control your truck needs. Each unit is loaded with the latest GM software updates for your specific VIN, ensuring optimal performance and communication between all related vehicle systems. Built to strict OEM standards, this module guarantees reliability and longevity, backed by our one-year warranty.
Installation and Post-Install Notes
Physically installing the BCM is straightforward. It is typically located under the driver’s side dashboard, near the steering column, and can be swapped in minutes. While our VIN programming handles the majority of the setup, some vehicles may require additional steps:
- Airbag System Sync: If the airbag 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: On some models, a brake pedal position sensor relearn may be necessary to ensure correct brake light operation.
This part is a direct replacement for multiple part numbers, including 25835965, 25835966, 15943678, 20939137, 22860591, and more.
Frequently Asked Questions
What does a Body Control Module do on a 2013 Sierra Denali?
The BCM acts as the central computer for your truck’s body electronics. It controls functions like power windows, door locks, interior and exterior lighting, the security system, wipers, and the HVAC climate control system.
Is this BCM ready to install out of the box?
Yes! This module is professionally programmed to your vehicle’s VIN before shipping. This makes it a plug-and-play installation, with no need for additional dealership programming for most functions.
Where is the BCM located?
On most 2007-2013 GM trucks and SUVs, including the Sierra and Silverado, the BCM is located under the driver’s side of the dashboard, typically to the left of the steering column.
My airbag light is on after installing the new BCM. What should I do?
This is a known possibility. The new BCM needs to be electronically introduced to the airbag system (SDM). A repair shop with an advanced scan tool can perform the “Setup SDM Primary Key in BCM” function to resolve this.
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 extra fees or hassle.