Restore Your SUV’s Electrical System and Drive with Confidence
Are you battling frustrating electrical issues in your GMC Envoy, Chevy Trailblazer, or other GM SUV? Flickering lights, malfunctioning power windows, or a security system that has a mind of its own are classic signs of a failing Body Control Module (BCM). As the central hub for your vehicle’s comfort and convenience features, a faulty BCM can make every drive a headache. I’ve seen it in my shop hundreds of times: a perfectly good engine but a vehicle that’s nearly undrivable due to these electrical gremlins. This isn’t just an annoyance; it can be a real safety concern.
This listing is for a replacement BCM, part number 15135466, that arrives ready to solve your problems. We utilize a professional Cloning Service, which means we transfer the essential data from your original BCM directly to this replacement unit. By providing us with your Vehicle Identification Number (VIN) after purchase, we ensure the module is flashed with the latest GM software and configured specifically for your vehicle’s options. This process eliminates the need for expensive and time-consuming dealership programming, getting you back on the road faster and with less hassle.
A Technician’s Notebook: The Case of the Erratic Envoy
A customer brought in a 2006 Envoy XL with a laundry list of complaints: the radio would turn off randomly, the driver’s side power window wouldn’t work, and the “Service 4WD” light was on, even though the transfer case was fine. A scan showed a U0140 code—Lost Communication With Body Control Module. Instead of just replacing the BCM and sending them to the dealer for a costly programming session, we used a cloning service just like this one. We transferred the data from his old, failing module to the new one. After a 30-minute install, all the electrical gremlins were gone. The customer saved hundreds of dollars and hours of frustration. This is the exact solution we offer you.
Common Signs of a Failing BCM
If your vehicle is exhibiting any of these symptoms, a failing BCM is the likely culprit. A diagnostic scan looking for communication codes like U0140 can help confirm the issue.
- ✔ Power windows, door locks, or mirrors operating intermittently or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The security or anti-theft system light is illuminated, preventing the engine from starting.
- ✔ Erratic or non-functional instrument panel gauges.
- ✔ The radio or climate control system behaves unpredictably.
- ✔ False warnings appearing on the driver information center.
Your Straightforward BCM Installation Guide
Installing your cloned BCM is a manageable job for a DIY enthusiast. The module is typically located behind the rear seat on the driver’s side, integrated with the fuse panel.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before starting work.
- Access the Module: Locate the rear fuse block. You may need to fold down the rear seat and remove a plastic cover or panel to gain access.
- Disconnect Connectors: Carefully unplug all the electrical connectors from the old BCM. They have locking tabs, so use a small flathead screwdriver to gently release them if needed. Avoid pulling on the wires themselves.
- Remove the Old BCM: Unbolt or unclip the old BCM/fuse block assembly from its mounting location.
- Install the New BCM: Mount your new, cloned BCM in the same position and securely reconnect all the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect Power: Re-attach the negative battery terminal. Turn the key to the ‘ON’ position (without starting) and test all body functions like windows, locks, and lights.
Important Post-Installation Notes
Our cloning service handles the vast majority of the setup, but some vehicle systems may require a quick sync-up after installation.
- Airbag System Sync: If the airbag warning light is on after you’ve installed the new BCM, a ‘Setup SDM Primary Key in BCM’ procedure is needed. This requires a professional scan tool to sync the airbag system with the new module.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure the brake lights and traction control system function correctly.
- Core Return Policy: No need to worry about core charges! We perform the cloning service and always ship your original module back to you along with the newly programmed replacement.
Disclaimer: Vehicle systems can vary. For detailed procedures specific to your model, always consult a factory service manual or a qualified automotive technician.
Guaranteed Fitment for Your GM SUV
This BCM is a direct replacement for part numbers 15135466, 25802312, 8258023120, and 15787809. It is confirmed to fit the following vehicles (without factory security system unless otherwise noted):
- 2005-2006 GMC Envoy XL
- 2005-2009 GMC Envoy
- 2005-2009 Chevrolet Trailblazer & Trailblazer EXT
- 2005-2007 Buick Rainier
- 2005-2008 Isuzu Ascender
- 2006-2009 Saab 9-7X
Why do you need my VIN?
Your VIN (Vehicle Identification Number) is crucial. We use it to access the latest factory software updates from GM and configure the BCM to match the specific options your vehicle was built with, ensuring seamless operation.
What is a “Cloning Service”?
Cloning is a process where we transfer the vehicle-specific security and operational data from your original, failing BCM to the replacement unit. This makes the new module a perfect digital match for your vehicle, avoiding the need for dealership programming.
Will I need any special tools for installation?
For the physical installation, you’ll only need basic hand tools like a socket set and screwdrivers. However, in some cases (as noted above), a professional bidirectional scan tool may be required for post-installation procedures like an airbag system sync.
What happens to my old BCM?
We always return your original BCM with your newly programmed replacement. We do not keep it, and there are no core charges or fees involved.
Is this a guaranteed fix for my electrical problems?
This BCM will resolve issues directly caused by a faulty module. While the BCM is a very common point of failure for the symptoms listed, proper diagnosis is key. We recommend confirming the BCM is the problem before ordering.