Finally, A Real Fix for Your GM Truck’s Electrical Gremlins
Are strange electrical issues turning your reliable GMC Sierra Denali, Chevy Silverado, or Tahoe into a source of daily frustration? One moment the A/C works, the next it doesn’t. Power windows have a mind of their own, and mysterious warning lights appear on the dash. These aren’t random problems; they are classic signs of a failing Body Control Module (BCM). This VIN-programmed 25835966 Body Control Module is the definitive, plug-and-play solution to restore your vehicle’s comfort, convenience, and safety features, getting you back on the road with confidence.
Common Symptoms & Your Solution
A faulty BCM can cause a cascade of confusing issues. If you’re experiencing any of the following, it’s highly likely your BCM is the culprit:
- Intermittent or non-working HVAC and climate controls.
- Power windows, door locks, or interior/exterior lights behaving erratically.
- An active airbag warning light, often with Diagnostic Trouble Code (DTC) B1001.
- Security system malfunctions that may prevent the vehicle from starting.
- Unexplained battery drain or other electrical system faults.
Instead of spending a fortune on diagnostic fees and a trip to the dealership, this pre-programmed module allows you to solve the problem yourself. We configure the unit to your vehicle’s specific VIN, ensuring it works correctly right out of the box.
Features & Benefits
- ✔ Plug-and-Play Installation: Arrives pre-programmed to your vehicle’s VIN. No expensive dealership computers or additional programming required.
- ✔ Restores Full Functionality: Regain reliable control over your lights, windows, locks, wipers, security system, and HVAC for a more comfortable and predictable driving experience.
- ✔ Eliminates Common Faults: Specifically addresses and resolves common electrical DTCs, including the notorious B1001 airbag code (post-install sync may be needed).
- ✔ OEM-Grade Quality: Built to meet or exceed original equipment standards for long-lasting durability and dependable performance, whether it’s on the job site or on a family road trip.
- ✔ Guaranteed Peace of Mind: This unit is backed by our one-year replacement warranty.
- ✔ Broad Compatibility: An exact replacement for part numbers 25835966, 15940214, 25844480, 20939137, 22860591, and more, ensuring a perfect fit for a wide range of GM trucks and SUVs.
From a 20-Year Vet Tech: One of the most common mistakes I see when replacing these modules is overlooking the vehicle’s ground connections. On these GMT900 platforms, a poor ground at the G218 location (often on the driver’s side A-pillar) can cause voltage spikes that damage the new BCM over time. Before installing your new 25835966 Body Control Module, take 10 extra minutes to check, clean, and tighten the main body grounds. It’s the best way to ensure a permanent repair and protect your investment.
Don’t let a faulty module compromise your vehicle’s functionality. This programmed 25835966 Body Control Module is the most efficient and reliable way to get your truck or SUV performing like it just rolled off the factory floor. Installation is straightforward, typically located under the driver’s side dash, and can be completed in minutes.
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. This module is sold as a plug-and-play solution. We program it using your vehicle’s VIN before it ships, so it’s ready for installation right out of the box, saving you time and money.
What exactly does the Body Control Module do?
The BCM acts as the central computer for your vehicle’s body electronics. It manages non-engine related functions like power windows, door locks, interior and exterior lighting, the security system, wipers, and the HVAC system.
Where is the BCM located and is it hard to replace?
On most compatible GM trucks and SUVs, the BCM is located under the driver’s side dashboard, near the steering column. It is typically held in by simple clips or a few bolts, making replacement a straightforward job for a DIYer with basic tools.
My airbag light is on. Will this fix it?
A failing BCM is a very common cause of an airbag light with code B1001. While this module will fix the root cause, you may need to perform an “SDM Primary Key Setup” procedure with a professional scan tool after installation to sync the new BCM with the airbag system and turn off the light.
My original part number isn’t 25835966, will this still work?
Yes, this module is a direct replacement for a long list of interchangeable part numbers, including 25844480, 15940214, 20939137, and others listed in the compatibility section. As long as your vehicle is listed, this programmed module will work perfectly.
Is there a core charge for my old part?
No, there is no core charge. You are not required to send your original module back to us, saving you the hassle and expense of return shipping.