Restore Full Electrical Function to Your GM Truck or SUV
Are you battling frustrating electrical gremlins in your GMC Sierra, Chevy Silverado, or Tahoe? Intermittent power windows, a malfunctioning HVAC system, or a persistent airbag light can often be traced back to a single component: a failing Body Control Module (BCM). This genuine quality GM BCM, part number 20939138 (interchangeable with 25844480 and others), is the central command unit for your vehicle’s body electronics. We pre-program it to your vehicle’s specific VIN, ensuring a seamless, plug-and-play installation that restores your truck’s systems to factory-perfect operation without a trip to the dealership.
Is Your GM Truck’s BCM Failing?
A faulty BCM can manifest in numerous ways, making diagnosis tricky. If you’re experiencing any of the following, your BCM is the likely culprit:
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ HVAC controls are unresponsive, or the blower motor works intermittently.
- ✔ The security system acts up, causing a no-start condition or random alarm activation.
- ✔ An airbag warning light is illuminated on the dash, often with DTC B1001.
- ✔ Interior dome lights or exterior lights (headlights, taillights) flicker or fail to work.
- ✔ Communication errors with other modules, leading to stalling or misfires.
The Direct-Fit Solution for Your 2007-2010 Sierra Denali BCM
Don’t let a faulty module keep your truck off the road. This replacement BCM is the definitive solution, offering reliability and convenience.
- VIN Programmed for You: We flash the module with the latest GM software and your vehicle’s VIN before shipping. This ensures all factory options work correctly right out of the box.
- Simple Installation: Located under the driver’s side dash near the steering column, swapping the BCM typically takes less than 5 minutes. No special tools are required for the physical replacement.
- No Core Charge: Keep your old part. We don’t require a core return, saving you time and hassle.
- Wide Compatibility: This module is a direct replacement for a wide range of GM trucks and SUVs from 2007-2013, including the Chevrolet Avalanche, Silverado, Suburban, Tahoe; GMC Sierra, Yukon; and Cadillac Escalade. It interchanges with numerous part numbers like 25835966, 15943678, 25790508, and 22860591.
Post-Installation Procedures
While the installation is plug-and-play, some vehicles may require a simple sync procedure. If the airbag warning light appears 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. In some cases, a ‘Brake Pedal Position Relearn’ may also be necessary. These are standard procedures that any qualified technician can perform. When you order a pre-programmed 2007-2010 Sierra Denali BCM from us, you’re getting a part that is ready for these final steps, saving you the high cost of dealership programming.
Frequently Asked Questions
What does a BCM do on a GMC Sierra?
The Body Control Module (BCM) acts as the central computer for your truck’s non-engine related electronics. It controls functions like power windows, door locks, interior/exterior lighting, the security system, wipers, and the HVAC system.
Is this BCM difficult to install?
The physical installation is very easy, typically taking under 5 minutes. It’s located under the steering column and just requires unplugging the old module and plugging in the new one. No special tools are needed for this part of the job.
Will I need to take my truck to the dealer after installing this?
No. Because we pre-program the BCM to your vehicle’s VIN, you avoid the expensive programming fees and hassle of a dealership visit. It arrives ready for installation.
What happens if my airbag light is on after installation?
This is a normal security measure. A technician will need to use a professional scan tool to perform a quick ‘Setup SDM Primary Key in BCM’ procedure to sync the new BCM with the airbag system and turn off the light.
How do I know this part will fit my vehicle?
This module fits a wide range of 2007-2013 GM trucks and SUVs. You can confirm fitment by matching your original part number to the list of interchangeable numbers provided, or by using the vehicle fitment guide on our website.