Restore Full Functionality to Your SUV
Are strange electrical issues plaguing your Trailblazer, Envoy, or Ascender? Intermittent power windows, flickering dash lights, malfunctioning door locks, or even no-start conditions often point directly to a failing Body Control Module (BCM). As the central command center for your vehicle’s electronics, a faulty BCM can cause a wide range of frustrating and unpredictable problems. This replacement BCM is the definitive solution to get your trusted truck back to 100% operational condition.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a failing BCM is the likely culprit:
- Power windows, mirrors, or door locks working intermittently or not at all.
- Interior lights or dashboard illumination acting erratically.
- The security light stays on, preventing the engine from starting.
- Erroneous warning lights on the instrument cluster.
- Communication issues with other vehicle modules, leading to diagnostic trouble codes (DTCs) like U1000.
This module is the direct-fit, reliable fix for these issues. We make the repair process simple by pre-programming this Programmed 15787809 BCM to your vehicle’s specific VIN before it ships. This critical step ensures all factory-installed options on your vehicle communicate correctly with the new module, restoring the performance and reliability you depend on.
Features & Benefits
- โ VIN-Programmed for Your Vehicle: We flash the module with the latest GM software using your VIN. This ensures compatibility and proper function right out of the box.
- โ Skip the Dealership: Avoid the high costs and scheduling hassles of dealer programming. This module is prepared for installation upon arrival.
- โ Restore Full Electrical Control: Regain reliable operation of your power accessories, lighting, and security systems.
- โ No Core Charge: Keep your old module. There’s no need to worry about the cost or inconvenience of a core return.
- โ Direct-Fit Replacement: Engineered to replace original part numbers 25802312, 8258023120, 15135466, and 15787809, guaranteeing a perfect fit.
- โ Peace of Mind: This unit is backed by our one-year replacement warranty.
An Expert’s Insight on BCM Replacement
From a technician’s perspective, a BCM isn’t just a box of relays; it’s the vehicle’s central nervous system for body electronics. In GMT360 platform vehicles like the Trailblazer and Envoy, everything from the radio to the power windows runs through it. Simply swapping in a used module from a junkyard is a recipe for disaster. Mismatched software can cause more problems than it solves, and certain features may not work at all. That’s why we insist on programming every module to your specific VIN. Itโs the only way to ensure a seamless, correct, and lasting repair that brings the vehicle back to its original operational state.
Installation & Post-Install Notes
While this Programmed 15787809 BCM is designed for a straightforward installation, some vehicles may require additional procedures after the new module is connected. Please be aware of the following:
- 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.
- Brake Pedal Position Relearn: A recalibration of the brake pedal position sensor may be needed on some models to ensure proper brake light and traction control function.
We always recommend consulting a factory service manual or a qualified technician for specific guidance on your vehicle. Getting your vehicle fixed correctly is our top priority, and this Programmed 15787809 BCM is the most reliable way to do it.
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will provide clear instructions on how to do this. We cannot ship your part until we receive and validate your VIN.
Is this BCM truly ‘plug and play’?
For most vehicles, yes. Because we program it to your VIN, the main functions will work immediately upon installation. However, as noted above, certain systems like the airbag (SRS) or brake sensor may require a simple relearn procedure with a compatible scan tool to fully sync with the new BCM.
Will this fix my ‘No Start’ security issue?
In many cases, yes. A faulty BCM is a very common cause of security system-related no-start conditions on these GM SUVs. By programming the module to your VIN, the security information is correctly matched, which should resolve the issue.
What if I have an airbag light on after installation?
This is a known possibility. The new BCM needs to be electronically ‘introduced’ to the airbag’s Supplemental Deployment Module (SDM). A qualified technician with a high-end diagnostic tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to turn off the light.
How do I know if this part number is correct for my vehicle?
This module replaces several part numbers, including 15787809, 25802312, 15135466, and 8258023120. Please check the fitment list on this page and compare it to the part number on your original BCM to ensure compatibility.