Restore Full Electrical Function to Your GM Truck
Are you battling frustrating electrical problems 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 OEM-quality BCM, part number 20939138 (interchangeable with 25844480), is the definitive solution. It arrives pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and ensuring a seamless, plug-and-play installation.
Common Symptoms of a Failing BCM
- ✔ Power windows, door locks, or mirrors not working correctly.
- ✔ Interior or exterior lights behaving erratically or not turning on.
- ✔ HVAC controls are unresponsive, or the blower motor works intermittently.
- ✔ The vehicle’s security system malfunctions, causing starting issues or false alarms.
- ✔ An airbag warning light is illuminated on the dash, often with DTC B1001.
- ✔ Unexplained battery drain when the vehicle is off.
- ✔ Communication errors with other vehicle modules.
The Superior 2013 Sierra Denali BCM Solution
Don’t settle for a generic part that requires complex programming. Our BCM is meticulously prepared for your specific truck. We flash it with the latest GM software updates and program it to your VIN before it ships. This ensures that all factory-installed options and security protocols work exactly as they should the moment you plug it in. This module is the central command for your truck’s body electronics, and our programming service makes the repair straightforward and reliable.
Installation and Post-Install Notes
The BCM is typically located under the driver’s side dashboard, near the steering column. The physical replacement is simple and usually takes less than 15 minutes. After installation, most vehicles will be fully functional. However, please note the following potential procedures:
- Airbag System Sync: If the airbag warning light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure proper brake light and traction control operation.
This part is a direct replacement for multiple part numbers, including: 25835966, 15263363, 15943678, 25790508, 25835965, 20939137, 22860591, and more. There is no core charge, so you can keep your old part.
Frequently Asked Questions
What does the Body Control Module do on my Sierra?
The BCM is the main computer for your truck’s body electronics. It controls non-engine related functions like power windows, door locks, interior/exterior lighting, the security system, wipers, and the HVAC system.
Will I need to take this part to a dealer for programming?
No. This BCM comes fully programmed to your vehicle’s VIN. It is a plug-and-play solution that does not require any additional dealership programming for standard operation.
What if my airbag light stays on after I install the new BCM?
This is a common security feature. You will need a professional-grade scan tool to perform the ‘Setup SDM Primary Key in BCM’ function. This re-establishes the connection between the airbag system and the new BCM, turning off the light.
Is this a reliable part?
Absolutely. This is an OEM-quality component built to meet or exceed original factory specifications. It comes with a one-year warranty for your peace of mind.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module without any extra fees.