Restore Full Electrical Function to Your GM Truck or SUV
Are you battling frustrating electrical problems in your Cadillac Escalade, Chevrolet Silverado, or GMC Sierra? A faulty Body Control Module (BCM) is often the culprit behind issues like malfunctioning lights, unresponsive power windows and locks, erratic HVAC behavior, and persistent warning lights. This genuine GM BCM, part number 20939138, 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
The BCM acts as the central command for your vehicle’s body electronics. When it begins to fail, it can cause a wide range of confusing symptoms. If you’re experiencing any of the following, a replacement module is likely needed:
- ✔ Intermittent or non-working interior and exterior lights.
- ✔ Power windows, door locks, or mirrors that operate erratically or not at all.
- ✔ HVAC controls that are unresponsive or a blower motor that won’t turn on.
- ✔ An illuminated airbag warning light, often with DTC B1001.
- ✔ Security system malfunctions, causing no-start conditions or random alarms.
- ✔ Unexplained battery drain or other perplexing electrical gremlins.
The Plug-and-Play Solution: A Pre-Programmed Escalade EXT BCM
Forget expensive dealership visits and programming fees. We handle the complex part for you. By programming this module with the latest GM software updates matched to your vehicle’s VIN, we ensure it works correctly right out of the box. This process restores factory settings and resolves common diagnostic trouble codes, providing a reliable and lasting repair. This module is a direct replacement for a wide range of part numbers, including 25844480, 25835966, 15943678, 20939137, and 22860591, among others.
Installation and Post-Install Procedures
Physical installation is straightforward for most DIY mechanics and professionals. The BCM is typically located under the steering column. While the module is plug-and-play for most functions, some vehicles may require a simple relearn procedure if certain warning lights appear post-installation:
- Airbag System Sync: If the airbag light remains on, a ‘Setup SDM Primary Key in BCM’ procedure is needed. This requires a professional-grade scan tool and syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: In some cases, a brake pedal position sensor recalibration may be necessary to ensure correct brake light and traction control operation.
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. This module comes fully programmed to your vehicle’s VIN. It is ready for installation upon arrival, saving you a trip to the dealership and additional programming costs.
Where is the BCM located on my 2010 GMC Sierra?
On most compatible GM trucks and SUVs from this era, including the GMC Sierra and Cadillac Escalade EXT, the BCM is located under the driver’s side dashboard, near the steering column.
What if my airbag light is on after I install the new module?
This is a known possibility. You will need to have a technician with an advanced diagnostic tool perform the “Setup SDM Primary Key in BCM” procedure to sync the new module 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 extra fees or hassle.
Will this part fix my power windows and door locks that stopped working?
Yes, the BCM directly controls those functions. If your windows and locks are failing, and you’ve ruled out fuses or individual motors, a faulty BCM is the most likely cause. This replacement part is designed to fix that problem.