Restore Full Functionality to Your GM SUV
Are you dealing with baffling electrical issues in your 2005-2009 GMC Envoy, Chevy Trailblazer, or related GM SUV? Problems like flickering interior lights, power windows and locks that work intermittently, or a battery that drains overnight are classic signs of a failing Body Control Module (BCM). As the central hub for your vehicle’s body electronics, a faulty BCM can create a host of frustrating and unpredictable problems. This isn’t just an inconvenience; it can affect vehicle security and safety. We offer a reliable, straightforward solution to get your truck back to 100%.
This is a comprehensive Cloning Service for your BCM. Instead of paying for expensive diagnostics and programming fees at a dealership, you simply send us your original module. We extract the unique vehicle data and transfer it directly to a quality replacement unit. This process ensures the replacement BCM is a perfect electronic match for your vehicle, retaining all original settings and key information. It arrives back at your door, ready for a simple, plug-and-play installation.
From the Diagnostic Bay: The Case of the Haunted Trailblazer
A customer brought in a 2007 Trailblazer with a list of complaints that sounded like the truck was possessed. The dome lights would randomly turn on while driving, the radio would shut off, and the power locks had a mind of their own. They’d already replaced the battery twice. After confirming the battery and alternator were solid, I went straight for the BCM. On these GMT360 platforms, the BCM is located under the rear seat, and I’ve seen dozens of them fail due to corrosion from minor spills or moisture wicking up from the carpet. A quick inspection of their original module revealed the tell-tale signs of water damage on the circuit board. Our cloning service was the perfect fix, saving them hundreds compared to a new, dealer-programmed module and solving all the phantom electrical draws in one go.
Common Signs of a Failing BCM
- ✔ Power windows, door locks, or mirrors not working correctly or at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ Horn sounding randomly or not working when pressed.
- ✔ Unexplained battery drain that leaves you with a dead battery.
- ✔ Warning lights on the dashboard related to security or other body systems.
- ✔ Diagnostic Trouble Codes (DTCs) such as U0140 (Lost Communication With Body Control Module) or various B-series codes.
Your Straightforward Installation Guide
Installing your newly programmed 2005-2009 Envoy BCM is a simple process that most DIYers can handle with basic tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the BCM: On most of these GM SUVs (Envoy, Trailblazer, etc.), the BCM is located under the rear driver’s-side seat, integrated into the rear fuse block assembly. You may need to lift the seat cushion to access it.
- Disconnect and Remove: Carefully unplug all the electrical connectors from the BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting position.
- Install the Replacement: Mount the replacement BCM in the same location and securely plug in all the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all body functions: lights, locks, windows, radio, etc., to confirm the repair.
Important Post-Installation Steps
While our cloning service makes this a plug-and-play repair, some vehicle systems may require a ‘handshake’ with the new BCM. Please be aware of the following:
- Airbag System Sync: If your airbag (SRS) warning light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the airbag module to the BCM. This is only required if the light appears.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be necessary for proper brake light and traction control operation.
Disclaimer: Vehicle systems can vary. We always recommend consulting a factory service manual or a qualified technician if you are unsure about any step.
Verified Fitment For These GM SUVs
This cloning service is compatible with BCMs bearing part numbers 25802312, 8258023120, 15135466, or 15787809. It fits the following models:
- 2005-2009 GMC Envoy (w/o security system)
- 2005-2006 GMC Envoy XL (w/o security system)
- 2005-2009 Chevrolet Trailblazer (w/o security system)
- 2005-2006 Chevrolet Trailblazer EXT (w/o security system)
- 2005-2007 Buick Rainier (w/o security system)
- 2005-2008 Isuzu Ascender (w/o security system for 05-07)
- 2006-2009 Saab 9-7X
What is a BCM cloning service?
Our cloning service is a simple and effective process. You send us your original, faulty BCM. We use specialized equipment to read the vehicle-specific data (like VIN, mileage, and key information) and write it onto a replacement module. This ensures the new part is a perfect electronic match for your vehicle, avoiding any need for dealership programming.
Will I need to have this BCM programmed?
No. The whole point of our cloning service is to handle the programming for you. The module you receive back will be pre-programmed with your vehicle’s data and ready for installation right out of the box.
Where is the BCM located on my 2006 Envoy?
The Body Control Module on the 2005-2009 Envoy, Trailblazer, and related platforms is typically found under the rear seat on the driver’s side. It is part of the rear fuse block assembly. You’ll need to lift the lower seat cushion to access it.
What happens to my old BCM?
We always return your original module along with the programmed replacement unit. We do not keep your original part.
What if the airbag light comes on after I install it?
This can happen occasionally as the airbag system (SDM) may need to re-sync with the ‘new’ BCM. A technician with a bi-directional scan tool can perform a quick procedure called ‘Setup SDM Primary Key in BCM’ to turn the light off.