Restore Your Vehicle’s Brain and End Electrical Chaos
Are you dealing with baffling electrical issues in your GMC Terrain or other compatible GM vehicle? One moment the wipers turn on by themselves, the next the radio won’t work, and then the security light traps you in a no-start situation. These aren’t random glitches; they’re classic signs of a failing Body Control Module (BCM), the central hub for your vehicle’s electronics. In my 20+ years as a technician, I’ve seen how a bad BCM can make a perfectly good car feel possessed. The dealership solution is often a new module followed by a hefty bill for programming. We offer a smarter, more direct fix.
This is a fully tested, replacement BCM that comes pre-programmed with your vehicle’s exact data. How? Through our simple mail-in cloning service. You send us your original BCM, and we perform a complete data transfer to this replacement unit. This process copies all the vital information, including the VIN, mileage, and specific options your car came with from the factory. The result is a true plug-and-play module that restores function without requiring any expensive trips to the dealer for programming. It’s the most reliable way to get your vehicle back to normal.
From the Diagnostic Bay: The Case of the Chaotic Terrain
A customer brought in a 2011 GMC Terrain that was driving them crazy. The horn would honk when they used the turn signal, the power windows worked intermittently, and the dash would light up like a Christmas tree for no reason. They’d already replaced the battery and checked fuses, but the problems persisted. After hooking up my scan tool, I saw a slew of communication errors (U-codes) pointing to the BCM. Instead of a costly new module from the dealer, we used this exact cloning service. Once the programmed module arrived, the installation took less than an hour. Every function returned to normal immediately. The customer saved hundreds of dollars and countless headaches.
Common Signs of a Failing BCM
If your vehicle is experiencing any of the following, a faulty BCM is the likely culprit. A failing module can often set communication codes like U0100, U0140, or other body-related fault codes.
- ✔ Intermittent or non-working power windows, door locks, or interior lights.
- ✔ Wipers or headlights turning on or off unexpectedly.
- ✔ The anti-theft or security system preventing the engine from starting.
- ✔ Inaccurate gauge readings on the instrument cluster.
- ✔ False warnings for doors being ajar or other system alerts.
- ✔ Complete loss of communication with the scan tool in the BCM.
Your Straightforward BCM Installation Guide
Installing your programmed module is a manageable job for a DIYer with basic tools. Always prioritize safety.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow all systems to power down.
- Locate the BCM: On most 2010-2011 Terrain and Equinox models, the BCM is located on the left (driver’s) side of the dash or in the driver’s side kick panel area. You may need to remove a lower dash panel for access.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed 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 (without starting the engine) and test all body functions: lights, wipers, windows, locks, etc. Once confirmed, start the vehicle.
Important Post-Installation Steps
Because we transfer your vehicle’s original data, most functions will work immediately. However, in some cases, security systems may require a relearn procedure. Please be aware of the following potential requirements:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system. This is only necessary if the light is on.
- Brake Pedal Position Relearn: On certain models, a brake pedal position sensor recalibration might be needed to ensure correct brake light operation and to prevent issues with the traction control system.
- Disclaimer: Vehicle systems vary. We always recommend consulting a factory service manual or a qualified professional if you encounter any issues.
Verified Fitment For These GM Vehicles
This programming service and module are compatible with a range of GM vehicles. Please match your part number to ensure compatibility. This module is a direct replacement for part numbers: 13577850, 13505326, 13500384, 13574844, 13504004, 13504494, and 13578420.
- Buick Regal: 2011 (LH dash, w/o opt AUA)
- Cadillac SRX: 2010 (LH dash)
- Chevrolet Cruze: 2011, 2013 (LH kick panel)
- Chevrolet Equinox: 2010 (LH side dash)
- GMC Terrain: 2010, 2011 (LH side dash)
Frequently Asked Questions
How does the mail-in programming service work?
After you place your order, we will contact you with simple instructions and a shipping address. You mail your original BCM to us. Once we receive it, we transfer 100% of the data to the replacement module and ship it back to you, usually within one business day.
Do I need to send my original BCM?
Yes. This service requires your original module to clone the vehicle-specific programming. This ensures a perfect match and avoids the need for dealer-level programming tools after installation.
Is this a plug-and-play solution?
Yes, for over 95% of installations. Because we clone your original data, the vehicle will recognize the module as its own. In rare cases, a security relearn or other minor procedure as noted above may be necessary.
Is there a core charge?
No, there is no core charge for this item. You can keep your original, non-working module after you send it to us for the data transfer.
What if my original BCM is not communicating?
Even if your BCM is failing and not communicating with the vehicle, we can often still extract the necessary data directly from the board. Please contact us with your specific symptoms if you have concerns.