Is your Cadillac Escalade, Chevy Silverado, or GMC Sierra plagued by frustrating electrical issues?
If you’re dealing with flickering lights, unresponsive power windows, a malfunctioning HVAC system, or strange security alerts, a failing Body Control Module (BCM) is the most likely culprit. The BCM acts as the central nervous system for your vehicle’s body electronics, and when it fails, it can cause a wide range of confusing and intermittent problems. This OEM-quality replacement BCM, part number 15943678, is the definitive solution to restore order and full functionality to your vehicle.
From the Diagnostic Bay
We recently had a 2010 GMC Sierra in the shop with a classic case of BCM failure. The owner reported that the radio wouldn’t turn off, the driver’s side power lock was dead, and the A/C was completely unresponsive. He had already checked fuses and relays with no luck. A quick scan revealed multiple communication loss codes pointing directly to the BCM. After installing this VIN-programmed module—a process that took less than 10 minutes—every single electrical gremlin was gone. It’s a common repair that saves hours of diagnostic headaches.
Symptoms of a Failing GM Body Control Module
- ✔ Unresponsive power windows, door locks, or mirrors that work intermittently or not at all.
- ✔ Interior dome lights, headlights, or taillights staying on, flickering, or failing to activate.
- ✔ HVAC system problems, such as a blower motor that won’t run or is stuck on a single speed.
- ✔ An illuminated airbag warning light, often accompanied by Diagnostic Trouble Code (DTC) B1001.
- ✔ Vehicle security system faults, causing no-start conditions, random stalling, or false alarms.
- ✔ A variety of communication-related trouble codes stored in the vehicle’s computer system.
Why Choose Our 2007-2011 Escalade EXT BCM?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We pre-program each module to your vehicle’s specific VIN, ensuring it communicates flawlessly with all other onboard systems right out of the box. This critical step means you can bypass expensive dealership programming fees and lengthy service appointments. The module arrives with the latest GM software updates, providing reliable performance and resolving common electronic faults permanently. Built to strict OEM standards and backed by a one-year warranty, it’s a dependable fix for your daily driver or work truck.
Installation is straightforward for any DIYer with basic tools. The BCM is typically located under the driver’s side dashboard, near the steering column. Simply disconnect the battery, swap the modules, and reconnect. While most installations are plug-and-play, be aware that if your airbag light was on, a post-install ‘SDM Key Relearn’ procedure may be needed using a capable scan tool. This module is a direct replacement for part numbers 25844480, 25835966, 15263363, 15943678, 20939137, 22860591, and others.
Frequently Asked Questions
What does a Body Control Module do?
The BCM is a computer that controls and monitors most of your vehicle’s non-engine related electronic accessories. This includes power windows, locks, lights, wipers, the security system, and the HVAC climate control system.
Is this BCM difficult to install?
No, installation is typically very simple and takes under 15 minutes. The BCM is usually located under the steering column. You just need to disconnect the battery and swap the electrical connectors to the new module.
Do I need to take my truck to the dealer after installing this?
No. This module comes pre-programmed to your vehicle’s VIN. This allows you to skip the trip to the dealership for programming, saving you time and money.
What if my airbag light is on after installation?
If the airbag light is on, you will need a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ function. This syncs the new BCM with the airbag system and is a simple procedure for any qualified mechanic.
Is there a core charge for this part?
No, there is no core charge. You can keep your old part without needing to send it back.