Are you dealing with bizarre electrical issues in your GMC Terrain or another GM vehicle? One minute the power windows work, the next they don’t. The dashboard lights up like a Christmas tree for no reason, or worse, the vehicle won’t start due to a security system fault. As a technician with over two decades of experience, I’ve seen these exact problems hundreds of times, and a failing Body Control Module (BCM) is often the culprit. This isn’t just an annoyance; it’s a core component failure that can affect your vehicle’s safety and reliability.
This listing is for a replacement BCM, compatible with part number 13588446, that solves the biggest headache of BCM replacement: programming. We handle it for you. By using a specialized cloning service, we transfer the critical data from your original, faulty BCM to this replacement unit. The result is a true plug-and-play solution that saves you from an expensive trip to the dealership and the high costs associated with their programming equipment.
From the Diagnostic Bay: The Case of the Intermittent Equinox
A customer brought in a 2012 Equinox (which shares its platform with the Terrain) with a list of complaints that seemed unrelated. The radio would randomly turn off, the driver’s side power lock was inoperative, and the remote start worked only half the time. They had already replaced the battery and checked fuses. My initial scan showed a flurry of U-codes (communication errors) pointing to the BCM. Instead of just throwing a new part at it, we monitored the data stream. We saw the BCM intermittently dropping off the network, causing chaos with every system it managed. By providing a cloned 2012 Terrain Body Control Module, we restored all functions without needing a single programming session at the dealer. The customer was back on the road the next day, problem solved.
Common Signs Your BCM is Failing
The BCM is the central nervous system for your vehicle’s body electronics. When it starts to fail, the symptoms can be confusing and widespread. Here’s what to look for:
- ✔ Erratic or non-functional power windows, door locks, or interior/exterior lights.
- ✔ The security or anti-theft system light is on, preventing the engine from starting.
- ✔ Warning lights for ABS, Airbags, or Traction Control appear on the dash.
- ✔ The radio or infotainment system behaves erratically or doesn’t turn on.
- ✔ Communication fault codes, such as U0140 (Lost Communication With Body Control Module), are stored in other modules.
- ✔ Wipers or turn signals activating on their own or not working at all.
A Straightforward Guide to BCM Installation
Our cloning service makes the physical swap simple. Here are the general steps. For the 2012 Terrain and Equinox, the BCM is typically located on the left (driver’s) side of the dash.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the BCM: On most compatible models, you’ll need to remove the lower dash panel on the driver’s side to access the module. It’s often mounted to a bracket near the steering column.
- Disconnect and Remove: Carefully unplug all electrical connectors. They have locking tabs that must be pressed to release. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed BCM in the same location and securely reconnect all electrical connectors. Ensure they click 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 Steps After Installation
While our 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 potential procedures:
- Airbag System Sync: If your 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 airbag system with the new BCM and is only necessary if the light is on.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure your brake lights and traction control system function correctly.
Disclaimer: Vehicle systems vary. We always recommend consulting a factory service manual or a certified technician for procedures specific to your vehicle.
Verified Vehicle Compatibility
This service and part are a direct solution for a faulty 2012 Terrain Body Control Module and are also confirmed to fit the following vehicles. Please match your part number (13588446, 13580696, 123589093, 13584692, 13583542) for guaranteed compatibility.
- Buick LaCrosse: 2012, 2013
- Buick Regal: 2012
- Buick Verano: 2012
- Cadillac SRX: 2012
- Chevrolet Camaro: 2012, 2013, 2014
- Chevrolet Equinox: 2012
- Chevrolet Spark: 2013
- Chevrolet Volt: 2012
- GMC Terrain: 2012
Frequently Asked Questions
How does the cloning service work?
After you place your order, we will contact you with instructions to ship your original BCM to us. Once we receive it, we extract the vehicle-specific data and transfer it to the replacement module. We then ship the fully programmed, plug-and-play module back to you, typically within 1-2 business days of receiving your original.
Do I need to send my keys with the BCM?
No, you do not need to send your keys. All the necessary security information is stored within the BCM itself. Our cloning process transfers this data, so your existing keys will work seamlessly with the new module.
Is this a guaranteed fix for my vehicle’s problems?
This BCM will fix problems directly caused by a faulty BCM. While the symptoms listed are common indicators of BCM failure, it’s essential to have the vehicle properly diagnosed. Other issues, such as wiring faults or problems with other modules, can sometimes mimic BCM failure.
What if my original BCM is completely dead or not communicating?
In many cases, even if the BCM is not functioning in the vehicle, we can still extract the necessary data directly from the memory chip. Please contact us with the specifics of your situation if you believe your module is completely non-responsive.
Is there a core charge for this part?
No, there is no core charge. You are free to keep your original module after sending it to us for the data transfer service.