Restore Full Command of Your GM Truck or SUV
Is your powerful GMC Sierra, Chevy Silverado, or Cadillac Escalade plagued by frustrating electrical problems? Flickering lights, a non-responsive HVAC system, or random warning lights on the dash can sideline even the most capable truck. These are classic signs of a failing Body Control Module (BCM). This genuine GM BCM, interchangeable with part number 20939138, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play installation that gets you back on the road with confidence.
Common Symptoms & Your Solution
A faulty BCM acts like a glitch in your vehicle’s central nervous system, causing a cascade of confusing issues. If you’re experiencing any of the following, this module is the reliable fix you need:
- Unresponsive or intermittent HVAC and blower motor controls.
- Power windows, door locks, or exterior/interior lights that work sporadically or not at all.
- An illuminated airbag warning light, often accompanied by DTC B1001.
- Security system malfunctions that may prevent the engine from starting.
- Unexplained engine stalling, misfires, or persistent grounding issues.
By replacing your old unit with this pre-programmed 2011 GMC Sierra 3500 BCM 20939138, you are not just swapping a part; you’re restoring the core electronic stability and functionality your vehicle was designed to have.
Features & Benefits
- ✔ Plug-and-Play Installation: This module is expertly programmed to your vehicle’s VIN before shipping. This critical step ensures it communicates flawlessly with your truck’s other systems right out of the box, saving you from a costly and time-consuming trip to the dealership for programming.
- ✔ Restores Full Functionality: Regain complete and reliable control over your vehicle’s essential body electronics, from the power locks and windows to the climate control and security systems.
- ✔ Engineered for Durability: Built to strict OEM standards, this BCM is designed to withstand the demanding conditions of a work truck or daily driver, ensuring long-term dependability.
- ✔ Clear Stubborn Codes: A new, correctly programmed BCM is often the key to permanently resolving persistent and confusing diagnostic trouble codes (DTCs) related to body electronics.
- ✔ One-Year Warranty: This unit is backed by our one-year replacement warranty.
- ✔ No Core Charge: We don’t require you to send your old part back. The process is simple, fast, and hassle-free.
An Expert’s Note on Programming
For a vehicle like a 2011 Sierra Denali 3500, the BCM manages dozens of inputs and outputs that control everything from the heated seats to the trailer brake controller. Simply installing a non-programmed module is a recipe for failure. Our VIN-specific programming loads the latest GM software and tailors the module’s parameters precisely to your truck’s factory options. This ensures every feature works as intended and prevents the communication errors that can cause even more problems down the line. Installing our pre-programmed 2011 GMC Sierra 3500 BCM 20939138 is the only way to guarantee a correct and complete repair.
Frequently Asked Questions
What does a Body Control Module do on my truck?
The BCM is a computer that supervises and controls many of your vehicle’s non-engine-related functions. This includes power windows, locks, seats, interior and exterior lighting, the security system, wipers, and the HVAC climate control system.
Is this module difficult to install?
Installation is typically straightforward. The BCM is located under the driver’s side dashboard, near the steering column. For most models, the physical replacement can take less than 5 minutes. Since our modules are pre-programmed, no further computer setup is usually required.
Why is VIN programming so important?
VIN programming configures the BCM to the specific options and systems installed in your vehicle from the factory. Without it, the module won’t know how to operate features like power seats, specific lighting packages, or security systems, leading to malfunctions and error codes. Our service eliminates this problem entirely.
What if my airbag light stays on after installation?
In some cases, particularly if you had an airbag code like B1001, the new BCM may need to be synced with the airbag system’s computer (SDM). This requires a professional scan tool to perform a ‘Setup SDM Primary Key in BCM’ procedure. This is a simple sync, not a full reprogramming.
Will this fix my intermittent electrical issues?
This module is the direct solution for the vast majority of electrical problems listed in the symptoms section. While it’s always wise to check for bad grounds or wiring, a failing BCM is the most common culprit for these specific issues in GM trucks and SUVs.
Does this part fit other vehicles besides the 2011 GMC Sierra 3500 BCM 20939138?
Yes. This BCM is compatible with a wide range of 2007-2013 GM vehicles, including the Chevrolet Silverado, Tahoe, Suburban, Avalanche, GMC Yukon, and Cadillac Escalade. It is a direct replacement for numerous part numbers, ensuring a perfect fit for your application.