Restore Full Electrical Function to Your GM Truck
Are you battling frustrating electrical problems in your Chevrolet Avalanche 2500? Flickering lights, unresponsive power windows, or a malfunctioning security system are common signs of a failing Body Control Module (BCM). The BCM acts as the central nervous system for your vehicle’s body electronics, and when it fails, it can cause a cascade of confusing issues. This genuine quality GM replacement module, part number 15136877, is the definitive solution to restore your truck’s reliability and functionality.
From the Diagnostic Bay
We had a 2005 Silverado in the shop with a classic case of BCM failure that the owner had been chasing for months. The driver’s side window wouldn’t work, the radio lights would flicker, and the HVAC blower was intermittent. He had already replaced the window switch and the blower motor resistor with no luck. After a quick scan, we identified communication errors with the BCM. Installing this VIN-programmed module solved all three problems in under 10 minutes. It’s a reminder that when multiple, unrelated electrical systems act up, the BCM should be the first suspect.
Symptoms of a Failing Avalanche 2500 Body Control Module
- ✔ Power windows, door locks, or mirrors operating intermittently or not at all.
- ✔ Interior or exterior lights failing to work correctly, staying on, or not turning on.
- ✔ HVAC system issues, such as an inoperative blower fan or inability to control temperature.
- ✔ Security system malfunctions, including random alarm activation or a no-start condition.
- ✔ Airbag warning light illuminated on the dash, often with DTC B1001.
- ✔ Inconsistent or non-functional windshield wipers.
- ✔ A variety of communication-related Diagnostic Trouble Codes (DTCs) stored in the system.
The Critical Advantage of VIN Programming
Don’t settle for a generic module that requires a trip to the dealership. We program this BCM to your truck’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures that the module is loaded with the correct software and calibrations for your vehicle’s options. It’s a true plug-and-play solution that saves you time, money, and the headache of scheduling a dealership appointment for programming.
Installation and Post-Install Notes
Installation is straightforward for most DIY mechanics. The BCM is typically located under the driver’s side dashboard, near the steering column. Simply disconnect the battery, remove the old module, plug in the new one, and reconnect the battery. However, be aware of these potential post-installation requirements:
- Airbag System Sync: If the airbag warning light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure must be performed with a professional scan tool to sync the modules.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be needed to ensure correct brake light and traction control operation.
This module is a direct replacement for multiple part numbers, including 15116066, 15136225, 15198116, and more, ensuring wide compatibility across the GM truck and SUV lineup from 2002-2007.
Frequently Asked Questions
What does a Body Control Module do on my Avalanche?
The BCM is a computer that manages and controls many of your truck’s non-engine related electronic functions, such as power windows, door locks, interior lighting, security system, wipers, and the HVAC system.
Is this BCM difficult to install?
No, the physical installation is very simple and usually takes less than 15 minutes. It involves unplugging the old module and plugging in the new one. However, some vehicles may require a simple relearn procedure with a scan tool for specific functions like the airbag system.
Why is VIN programming so important?
VIN programming loads the module with the specific software and settings for your truck’s exact features (like power seats, specific lighting, etc.). Without it, a new BCM won’t work correctly, if at all. Our pre-programming makes it a plug-and-play part.
Will I need to take my truck to the dealer after installing this?
No. Because we program the module to your VIN before shipping, you can skip the expensive trip to the dealership for programming. In rare cases, a relearn procedure may be needed, which can be done by most independent repair shops.
What happens if my airbag light is on after installation?
This indicates the new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ must be performed with a bi-directional scan tool to resolve this.