Restore Full Electrical Function to Your GM Truck or SUV
Is your GMC Sierra, Chevrolet Silverado, or Cadillac Escalade plagued by frustrating electrical issues? A faulty Body Control Module (BCM) is often the culprit. The BCM acts as the central nervous system for your vehicle’s body electronics, managing everything from your power windows and door locks to the HVAC system and security features. When it fails, it can cause a cascade of seemingly unrelated problems. This genuine quality GM Body Control Module, interchangeable with part number 20939137, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play installation.
Common Symptoms of a Failing BCM
- ✔ Power windows, door locks, or mirrors operating intermittently or not at all.
- ✔ HVAC controls are unresponsive, or the blower motor works sporadically.
- ✔ The security system malfunctions, causing starting issues or false alarms.
- ✔ Interior or exterior lights (headlights, taillights, dome lights) fail to work correctly.
- ✔ The airbag warning light is illuminated, often with a DTC B1001.
- ✔ Wipers behave erratically or won’t turn off.
- ✔ Multiple diagnostic trouble codes (DTCs) related to body systems are stored.
Diagnosing and Replacing Your 2013 Sierra 3500 BCM
Replacing the BCM is a straightforward process that can restore your vehicle’s functionality without a costly trip to the dealership. This module is a direct-fit replacement, and because we program it to your VIN before shipping, you can bypass the need for expensive dealer-level tools. Simply locate your old BCM, typically found under the driver’s side dashboard near the steering column, disconnect the electrical connectors, and install the new one. In most cases, the job is done. However, for certain issues like a persistent airbag light, a post-installation procedure like an ‘SDM Key Sync’ may be required using a capable bidirectional scan tool. This ensures all related safety modules communicate correctly with the new 2013 Sierra 3500 BCM.
This module is a reliable replacement for a wide range of original part numbers, including: 25835966, 15263363, 15263497, 15878753, 15284816, 15943678, 15926094, 15940214, 25790508, 25790509, 25823558, 25823559, 25835965, 25844479, 25971916, 25971917, 15901388, 20939137, 20939138, and 22860591.
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before it ships. This ensures it is ready for installation right out of the box, saving you time and money.
Where is the BCM located on my 2013 Sierra 3500?
The Body Control Module is typically located under the driver’s side dashboard, often near the steering column or integrated into the fuse panel area.
What if my airbag light is still on after installation?
If the airbag light remains on (often with code B1001), you will need to perform the ‘Setup SDM Primary Key in BCM’ procedure. This requires a professional-grade scan tool and syncs the new BCM with your vehicle’s airbag system.
Is there a core charge for this part?
No, there is no core charge. You can keep your old module without any additional fees or hassle.
Will this fix my non-working power windows and locks?
Yes, a failing BCM is a very common cause of power window, lock, and other accessory malfunctions. Replacing it with this programmed 2013 Sierra 3500 BCM is the correct repair for these symptoms.