Experiencing Baffling Electrical Problems in Your GM Truck or SUV?
If your Chevrolet Tahoe, Silverado, or GMC Sierra is suffering from a mind of its own—with flickering lights, a malfunctioning climate control system, or power windows that refuse to cooperate—the culprit is likely a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s comfort and convenience features. When it fails, it can cause a cascade of frustrating and seemingly unrelated issues. This VIN-programmed BCM, part number 20939137, is the direct, reliable solution to restore full functionality to your vehicle without a costly trip to the dealership.
A customer brought in their 2009 Silverado 1500 with a perplexing issue: the battery would be dead every few days. They had already replaced the battery and the alternator, but the problem persisted. After connecting our scanner, we noticed several communication DTCs pointing to the BCM. The faulty module wasn’t allowing the vehicle’s systems to properly go to sleep, causing a parasitic draw that drained the battery overnight. Installing a VIN-programmed BCM like this one not only fixed the draw but also resolved other minor glitches the owner had learned to live with, like an intermittent dome light. It’s a perfect example of how one central component can be the root of many problems.
Is Your GM Vehicle Showing These Symptoms?
- ✔ Unresponsive or erratic HVAC and climate controls.
- ✔ Power windows, door locks, or mirrors not working correctly.
- ✔ An active airbag warning light, often with a B1001 diagnostic trouble code.
- ✔ Security system malfunctions, causing no-start or stalling conditions.
- ✔ Interior or exterior lights flickering, staying on, or not working at all.
- ✔ Intermittent wiper operation or washer fluid pump failure.
The Plug-and-Play Solution: A VIN-Programmed 2007-2011 Tahoe BCM
Forget about dealership appointments and programming fees. This Body Control Module arrives at your door pre-programmed to your vehicle’s specific VIN. We load the latest GM software updates, ensuring optimal performance and seamless integration right out of the box. This process resolves common software-related DTCs and ensures all electronic features controlled by the BCM operate exactly as the factory intended. Built to strict OEM standards, this module is a dependable replacement for a wide range of GM trucks and SUVs, including the Chevrolet Avalanche, Suburban, Cadillac Escalade, and GMC Yukon. Installation is straightforward, typically located under the driver’s side dash, and can be completed in minutes. No core charge means you can keep your old part without any hassle.
Post-Installation Procedures
While this module is designed for plug-and-play installation, some vehicles may require additional steps. If the airbag warning light remains on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ function. In some cases, a ‘Brake Pedal Position Relearn’ may also be necessary to ensure proper brake light and traction control operation. Always check for and repair any grounding issues during installation to prevent recurring electrical problems.
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM is a computer in your vehicle that controls and monitors many of its non-engine-related electronic systems. This includes power windows, locks, lights, wipers, the security system, and the HVAC climate control.
Is this BCM ready to install out of the box?
Yes! This module is sold with VIN programming. We flash it with your vehicle’s specific VIN and the latest GM software before shipping, so it’s ready for a plug-and-play installation without requiring a trip to the dealer.
Where is the BCM located on my 2008 Tahoe?
On most 2007-2013 GM trucks and SUVs like the Tahoe, Silverado, and Sierra, the BCM is located under the driver’s side of the dashboard, near the steering column.
What if my airbag light is on after I install the new BCM?
If the airbag light is illuminated, you will need a professional-grade scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with your vehicle’s airbag system.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module without any extra fees or hassle.
Will this part 20939137 fit other vehicles besides a Tahoe?
Yes, this BCM is interchangeable with many part numbers and fits a wide range of GM vehicles from 2007-2013, including the Cadillac Escalade, Chevrolet Avalanche and Silverado, and GMC Sierra and Yukon. Please check the fitment list to confirm for your specific model.