Tired of Chasing Electrical Gremlins in Your SUV?
Are you dealing with bizarre and frustrating issues in your GMC Envoy, Trailblazer, or related SUV? Flickering lights, power windows with a mind of their own, a security light that won’t turn off, or even a vehicle that refuses to start can all point to one culprit: a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it starts to fail, it can cause a cascade of unpredictable problems that are maddening to diagnose. Stop swapping relays and checking fuses—get the definitive solution that restores your vehicle’s function and your peace of mind.
Common Symptoms of a Failing BCM & Your Solution
A faulty BCM can manifest in numerous ways. You might be experiencing one or more of the following:
- Intermittent or non-functional power windows, door locks, and interior lights.
- Warning lights on the dashboard that appear for no reason.
- Problems with the radio or climate control system.
- A no-start condition where the engine cranks but won’t fire up, often related to the security system.
- Diagnostic trouble codes (DTCs), especially communication codes (U-codes), pointing to a loss of connection with other modules.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a quality-tested BCM and flash it with the latest official GM software, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This process ensures that all the specific options your SUV was built with are recognized and function correctly. By purchasing our Programmed 2002-2005 GMC Envoy BCM 15191621, you are bypassing the expensive trip to the dealership for programming and getting a part that’s ready to work the moment you plug it in.
An Expert’s Note on VIN Programming: On these GMT360 platform vehicles (Envoy, Trailblazer, etc.), the BCM is not a one-size-fits-all part. Options like the security system, power seat memory, and even specific lighting packages are all controlled by the BCM’s software. Simply installing a used module from another vehicle will almost certainly result in mismatched features and new problems. Our VIN-programming service isn’t just a convenience—it’s essential for a correct and lasting repair. We ensure the digital DNA of the module matches your exact vehicle, saving you from the headaches of incompatibility.
Features & Benefits
- ✔ Plug & Play Installation: This module arrives pre-programmed to your vehicle’s VIN. No dealership visit or expensive programming tools required.
- ✔ Restored Functionality: Puts an end to erratic behavior from your lights, locks, windows, and other body electronics.
- ✔ Updated GM Software: We flash the unit with the newest updates from GM, which can resolve factory bugs and improve performance.
- ✔ No Core Charge: Keep your original module. There’s no need to hassle with packaging and shipping your old part back to us.
- ✔ Guaranteed Compatibility: By using your VIN, we ensure this Programmed 2002-2005 GMC Envoy BCM 15191621 is a perfect match for your vehicle’s factory options.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty.
Guaranteed Fitment For:
This Body Control Module is a direct replacement for part numbers 15122670, 15065293, 15114669, 15191621, and 9352135. It fits the following vehicles, often specified as being without the factory security system:
- 2002-2005 GMC Envoy, Envoy XL, Envoy XUV
- 2002-2005 Chevrolet Trailblazer, Trailblazer EXT
- 2002-2004 Oldsmobile Bravada
- 2003-2005 Isuzu Ascender
- 2004-2005 Buick Rainier
- 2005 Saab 9-7X
Please verify your part number or contact us with your VIN to confirm compatibility before ordering.
Important Post-Installation Steps
While this BCM is designed for a simple installation, some vehicles may require one or more of the following procedures to be performed with a professional scan tool after the part is installed:
- Airbag System Sync: If the airbag warning light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure is necessary to sync the airbag system.
- Brake Pedal Position Relearn: A recalibration of the brake pedal position sensor may be needed to ensure proper brake light and traction control operation.
We highly recommend consulting a factory service manual or a qualified technician if you are unsure about these steps.
Frequently Asked Questions
How do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add it as a note during checkout or send it to us in a message referencing your order number. We cannot program and ship your BCM without it.
Is this BCM truly plug-and-play?
Yes, for the vast majority of functions. Because we program it to your VIN, it will operate your vehicle’s core features right out of the box. However, as noted above, some integrated systems like the airbag (SRS) may require a final sync procedure with a scan tool.
My original part number isn’t 15191621, but it’s on the list. Will this work?
Absolutely. The part numbers listed (15122670, 15065293, etc.) are all interchangeable. As long as your original part number is on our list, this module, once programmed to your VIN, will be the correct replacement.
Do I have to return my old BCM?
No. This product comes with no core charge. You can keep your old module, which can be helpful for comparison or as a backup if needed.
What tool is needed for the airbag light procedure?
The ‘Setup SDM Primary Key’ function requires a bi-directional professional diagnostic tool, such as a GM Tech 2, high-end Snap-on, or Autel scanner. Standard OBD-II code readers cannot perform this function.
Will this fix my specific problem for certain?
This Programmed 2002-2005 GMC Envoy BCM 15191621 will correct any issues directly caused by a faulty Body Control Module. While the symptoms listed are very common for BCM failure, we always recommend a proper diagnosis by a qualified technician to confirm the BCM is the root cause of your problems before ordering.