Restore Full Electrical Function to Your GM Truck or SUV
Are you experiencing a cascade of bizarre electrical problems in your Chevrolet Silverado, GMC Sierra, or Tahoe? From flickering lights and unresponsive power windows to a malfunctioning security system or dead HVAC controls, these are hallmark symptoms of a failing Body Control Module (BCM). The BCM acts as the central nervous system for your vehicle’s body electronics, and when it malfunctions, it can make your vehicle frustrating and unreliable. This genuine quality GM Body Control Module, part number 25844480, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play installation.
From the Diagnostic Bay
We had a 2013 GMC Sierra 3500 roll into the shop with a laundry list of complaints. The driver said his dome lights would stay on, the radio presets kept resetting, and the power door locks had a mind of their own. He’d already replaced the battery and checked fuses with no luck. After connecting our scanner, we saw multiple communication loss codes pointing to the BCM. Instead of a costly trip to the dealer for a new module and programming, we installed one of our VIN-programmed units. In under 10 minutes, every single electrical gremlin was gone. The customer was thrilled to have his work truck back to 100% without the dealership hassle or expense.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-working power windows, door locks, and interior/exterior lights.
- ✔ HVAC system failures, such as the blower motor not working or temperature controls being unresponsive.
- ✔ An illuminated airbag warning light, often accompanied by diagnostic trouble code (DTC) B1001.
- ✔ Security system malfunctions, causing no-start conditions, stalling, or false alarms.
- ✔ Unpredictable behavior from windshield wipers or other electronic accessories.
- ✔ A cluster of seemingly unrelated electrical communication codes stored in the vehicle’s memory.
Why Choose Our Programmed GM BCM?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The key benefit is our expert VIN programming service. We flash the module with the latest GM software updates specific to your vehicle before it ships. This eliminates the need for expensive dealership programming, saving you time and money. Built to strict OEM standards, this module ensures dependable performance and longevity, backed by a one-year warranty. It directly interchanges with a wide range of part numbers, including 25844479, 25835966, 15943678, 20939137, and 22860591, making it the perfect fit for your repair.
Installation and Post-Install Notes
Installation is straightforward for most DIY mechanics. The BCM is typically located under the driver’s side dashboard, near the steering column. Simply disconnect the negative battery terminal, unplug the electrical connectors from the old module, remove it, and install the new one in its place. Reconnect everything, and you’re done. There is no core charge, so you can keep your old part. In some cases, post-installation procedures may be necessary:
- Airbag System Sync: If the airbag light remains on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ function. 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 proper brake light and stability control operation.
Frequently Asked Questions
What does a Body Control Module do?
The BCM is a computer that manages and controls many of your vehicle’s non-engine related electronic functions, such as power windows, door locks, lighting, security system, wipers, and climate controls.
Is this BCM truly plug-and-play?
Yes. We pre-program the module to your vehicle’s VIN before shipping. This ensures it communicates correctly with your vehicle’s other systems right out of the box, eliminating the need for a trip to the dealership for programming.
Why is my airbag light on after installing the new BCM?
This can happen because the new BCM needs to be electronically ‘introduced’ to the vehicle’s Sensing and Diagnostic Module (SDM). A professional scan tool is required to perform the ‘Setup SDM Primary Key’ procedure to sync the modules and turn off 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 extra fees or hassle.
How can I be sure the BCM is the problem?
While the symptoms listed are strong indicators, a full vehicle scan with a professional diagnostic tool is the best way to confirm. Look for communication codes (U-codes) or specific BCM-related DTCs to pinpoint the failure.