Is Your GM Truck Experiencing Strange Electrical Issues?
If your GMC Sierra, Chevy Silverado, or Cadillac Escalade is plagued by frustrating electrical problems like flickering lights, a non-responsive HVAC system, or power windows with a mind of their own, a failing Body Control Module (BCM) is the most likely culprit. The BCM acts as the central command center for your vehicle’s body electronics. When it fails, it can cause a cascade of confusing and seemingly unrelated issues. This genuine GM BCM, part number 25844480, is the definitive solution to restore full electrical functionality and peace of mind.
From the Diagnostic Bay
We had a 2013 Sierra Denali 3500 come into the shop with a classic case of BCM failure. The owner reported the radio would turn off randomly, the driver’s side power lock wouldn’t work, and the air conditioning blower was completely dead. After checking fuses and grounds, we scanned the vehicle and found multiple communication loss codes pointing to the BCM. Instead of a costly trip to the dealer, we installed one of our VIN-programmed modules. The installation took less than ten minutes, and upon startup, every single issue was resolved. It’s a common repair that makes a world of difference.
Symptoms of a Failing BCM and Key Benefits
- ✔ Restore Full Control: Fixes non-working power windows, door locks, interior/exterior lights, and wipers.
- ✔ Solve HVAC Problems: Corrects intermittent or dead HVAC blowers and restores climate control functions.
- ✔ Eliminate Warning Lights: Clears persistent airbag warning lights, often associated with DTC B1001, after proper syncing.
- ✔ Resolve Security & Starting Issues: Addresses security system malfunctions, stalling, and other grounding-related problems.
- ✔ Plug-and-Play Installation: This module comes pre-programmed to your vehicle’s specific VIN. No expensive dealership programming is required.
- ✔ OEM Quality & Reliability: Built to strict General Motors standards for dependable, long-lasting performance, backed by a one-year warranty.
Your Direct-Fit Sierra Denali Body Control Module Solution
Replacing the Sierra Denali Body Control Module is a straightforward process. The unit is typically located under the driver’s side dash near the steering column. Once the old module is swapped out, your vehicle will immediately recognize the new, VIN-programmed unit. For most installations, the process is complete. However, in some cases, particularly if you had an airbag light on, a post-installation procedure may be needed. Using a professional scan tool, a technician can perform the ‘Setup SDM Primary Key in BCM’ function to sync the new BCM with the airbag system, extinguishing the warning light. This module is a direct replacement for a wide range of part numbers, including 15901388, 25835966, 20939137, and 22860591, ensuring broad compatibility across the GM truck and SUV lineup from 2007-2013.
Frequently Asked Questions
What does a Body Control Module do on a 2013 GMC Sierra?
The BCM is a computer that manages and controls many of your truck’s non-engine related electronic systems. This includes power windows, door locks, the security system, interior and exterior lighting, wipers, and the HVAC blower motor.
Is this BCM ready to install out of the box?
Yes. We program the module to your vehicle’s VIN before shipping. This ensures it communicates correctly with your truck’s other systems for a true plug-and-play installation, saving you a trip to the dealership.
Why is my airbag light still on after installing the new BCM?
This is a common security feature. The new BCM needs to be electronically ‘introduced’ to the airbag’s Supplemental Deployment Module (SDM). This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure, which syncs the modules and turns off the light.
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.
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.