Is Your GM SUV Plagued by Bizarre Electrical Problems?
If you’re experiencing strange and unpredictable issues like flickering lights, malfunctioning power windows, or random warning chimes in your GMC Envoy, Chevy Trailblazer, or a related platform vehicle, 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, coordinating everything from your interior lights and power locks to the instrument cluster and security system. When it starts to fail, it can create a cascade of frustrating and difficult-to-diagnose problems.
Symptoms of a Failing Body Control Module
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or won’t turn on at all.
- ✔ The security system acting up, preventing the vehicle from starting.
- ✔ Instrument cluster gauges behaving erratically or not working.
- ✔ Unexplained battery drain when the vehicle is off.
- ✔ Warning lights (like the airbag or brake light) appearing on the dash for no reason.
- ✔ Horn honking unexpectedly or not working when pressed.
The Direct-Fit, Programmed Solution for Your Envoy XL BCM
Don’t let a faulty module keep your SUV off the road. This replacement Body Control Module is the definitive solution to restore your vehicle’s electronic functions to perfect working order. We eliminate the biggest hurdle in BCM replacement: programming. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the module with the latest GM-certified software specific to your vehicle’s configuration. This ensures that when the part arrives, it’s a true plug-and-play installation. You can bypass the expensive dealership visit for programming and get your vehicle fixed faster and more affordably.
Installation and Post-Install Procedures
Installation is straightforward for those with mechanical experience. The BCM is typically located in the front fuse box area. After swapping the module, you may need to perform one or more of the following procedures with a professional-grade scan tool to ensure all systems communicate correctly:
- Airbag System Sync: If the airbag warning light is illuminated after installation, the ‘Setup SDM Primary Key in BCM’ procedure is required. This syncs the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Relearn: On some models, a recalibration of the brake pedal position sensor may be necessary to ensure correct brake light operation and to satisfy the traction control system.
Please note: While this module is pre-programmed for your vehicle, these additional sync procedures are sometimes necessary to fully integrate the new module with other existing components. Always consult a factory service manual or a qualified technician for specific guidance.
Compatibility Information
This module is a direct replacement for the following part numbers:
- 25802312
- 8258023120
- 15135466
- 15787809
It is designed to fit the following vehicles (without security system option unless specified otherwise):
- 2005-2006 GMC Envoy XL
- 2005-2009 GMC Envoy
- 2005-2006 Chevrolet Trailblazer EXT
- 2005-2009 Chevrolet Trailblazer
- 2005-2007 Buick Rainier
- 2005-2008 Isuzu Ascender
- 2006-2009 Saab 9-7X
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN when you order, and the module will arrive ready to be installed.
Where is the BCM located on my 2005 Envoy?
The Body Control Module on these GM SUV platforms is typically located in the front, integrated with the under-hood fuse box assembly.
What happens if my airbag light turns on after I install this?
If the airbag light comes on, it means the new BCM needs to be electronically ‘introduced’ to your vehicle’s airbag computer (SDM). A technician with a professional scan tool will need to perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the systems.
Is there a core charge for my old part?
No, there is no core charge associated with this part. You can keep your original module.
Will this fix my intermittent no-start problem?
A failing BCM is a very common cause of intermittent no-start conditions, especially if related to the security system. While other issues can cause this symptom, replacing a faulty BCM often resolves the problem.