Is your 2008-2009 Hummer H2 suffering from baffling electrical problems? Issues like flickering lights, malfunctioning power windows and locks, or a security system that acts up are often signs of a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it fails, it can cause a wide range of frustrating and difficult-to-diagnose symptoms. Restore full functionality and reliability to your vehicle with this direct-fit replacement BCM, pre-programmed specifically for your truck.
This isn’t just a generic part. We flash this module with the latest GM software updates using the Vehicle Identification Number (VIN) you provide. This ensures seamless integration with your H2’s existing systems, saving you a costly trip to the dealership for programming. Simply provide your VIN after purchase, and we’ll handle the complex programming before shipping it to your door.
Common Symptoms of a Failing H2 BCM
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Erratic behavior from the dashboard gauges or warning lights (including the security light).
- ✔ Interior or exterior lights staying on or not turning on at all.
- ✔ Remote keyless entry (RKE) system failure.
- ✔ Unexplained battery drain when the vehicle is off.
- ✔ No-start or intermittent starting conditions.
- ✔ Communication errors with diagnostic scan tools.
Installation and Required Procedures for Your 2008-2009 Hummer H2 BCM
While this module is a direct physical replacement, installing a new BCM requires a few final steps to ensure all vehicle systems communicate correctly. After installation, certain relearn or synchronization procedures may be necessary.
Post-Installation Steps:
- Airbag System Sync: If the airbag warning light is illuminated after you install the new BCM, a procedure called ‘Setup SDM Primary Key in BCM’ must be performed. This requires a professional-grade scan tool to sync the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Relearn: To ensure your brake lights and traction control system function correctly, a brake pedal position sensor recalibration might be needed. This is a simple procedure for a technician with the right equipment.
Disclaimer: Specific procedures can vary. Always consult a factory service manual or a qualified automotive technician for guidance tailored to your vehicle.
Guaranteed Fitment for a Wide Range of GM Vehicles
This BCM is a direct replacement for part number 20921435 and is also compatible with the following part numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084. It fits a variety of GM models, including the 2008-2009 Hummer H2 BCM, as well as select models of the Acadia, Escalade, Tahoe, Yukon, Silverado, Sierra, Express, Savana, and more.
Frequently Asked Questions
What does a Body Control Module do on a Hummer H2?
The BCM acts as the brain for your H2’s body electronics. It controls functions like power windows, locks, interior and exterior lighting, the security system, and the instrument cluster. A failing BCM is a common source of strange electrical issues.
Is this BCM plug-and-play?
This module is programmed to your vehicle’s VIN before shipping, which handles the most difficult part of the installation. However, after physical installation, you may need to perform additional relearn procedures, such as for the airbag system or brake pedal position sensor, using a professional scan tool.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will use this to load the correct software and settings for your specific vehicle before we ship the part.
Do I need to return my old BCM?
No, there is no core charge for this part. You can keep your original module.
Will this fix my specific electrical problem?
This BCM will correct issues directly caused by a faulty module. While the symptoms listed are common indicators of BCM failure, we always recommend a proper diagnosis by a qualified technician to confirm the BCM is the root cause before ordering.