End Frustrating Electrical Problems in Your GM Vehicle
Are you battling bizarre electrical issues in your 2012 GMC Terrain? Flickering lights, power windows with a mind of their own, or a security system that prevents your car from starting can all point to one culprit: a failing Body Control Module (BCM). As the central hub for your vehicle’s body electronics, a faulty BCM can create a cascade of frustrating and hard-to-diagnose problems. Dealerships often charge a fortune for a new module plus the mandatory programming. We offer a smarter, more affordable solution.
This is a replacement BCM, compatible with part number 13588446 and others, that comes with a critical programming service. Instead of you needing expensive scan tools or a trip to the dealer, we handle the complex part. You simply ship us your original BCM, and we professionally clone all of its essential data—including VIN, mileage, and security keys—onto this replacement unit. We then ship the ready-to-install module back to you. It’s the most reliable way to get your vehicle back to 100% without the dealership hassle.
From the Diagnostic Bay: The Case of the Intermittent Equinox
I remember a 2012 Chevy Equinox—which shares its platform with the Terrain—that came into my shop with the most baffling symptoms. The owner complained of random no-starts, and the radio would sometimes stay on after the key was removed, draining the battery. We checked the battery, alternator, and all the grounds, but everything tested fine. No consistent fault codes were stored. After experiencing the issue firsthand, I suspected the BCM was failing internally. Instead of a costly new unit, we used a programming service just like this one. We swapped the cloned BCM in under 30 minutes, and the vehicle’s electrical gremlins were gone for good. It saved the customer hundreds and turned a potential week-long diagnostic nightmare into a simple, one-day fix.
Is Your GM Vehicle Showing These BCM Failure Signs?
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior dome lights or dashboard lights staying on or not working at all.
- ✔ Horn honking unexpectedly or the alarm system malfunctioning.
- ✔ The security or anti-theft light is on, causing a no-start condition.
- ✔ Communication error codes (U-codes) stored in the system, like U0140.
- ✔ Wipers, turn signals, or other accessories operating intermittently.
Your Straightforward BCM Installation Guide
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- ✔ Locate the BCM: In the 2012 GMC Terrain and Chevy Equinox, the BCM is typically located on the left (driver’s) side of the dash, often behind the lower dash panel or kick panel.
- ✔ Remove Trim Panels: Carefully remove any plastic trim or panels necessary to access the module. Use a trim removal tool to avoid scratching the plastic.
- ✔ Disconnect and Remove: Unplug all 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 newly programmed BCM in the same location and reconnect all electrical connectors, ensuring they click securely into place.
- ✔ Reconnect Battery: Reattach the negative battery terminal. Start the vehicle to confirm that the primary functions are restored.
Post-Installation Procedures
Our cloning service makes this a near plug-and-play repair, but some GM vehicles may require a simple recalibration for related systems. Please be aware of the following:
- Airbag System Sync: If your airbag warning light is illuminated after installation, a technician will need to perform the “Setup SDM Primary Key in BCM” procedure with a capable scan tool. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position relearn may be needed to ensure the brake lights and traction control system function correctly. This is also done with a diagnostic tool.
Disclaimer: Vehicle systems vary. For detailed instructions specific to your exact model, always consult a factory service manual or a certified automotive technician.
Verified Compatibility for Your Vehicle
This BCM programming service is a direct solution for units with part numbers 13580696, 123589093, 13588446, 13584692, or 13583542. It is confirmed to fit the following models:
- Buick LaCrosse: 2012-2013 (Located in LH kick panel)
- Buick Regal: 2012 (Located in LH dash)
- Buick Verano: 2012 (Located below center of dash)
- Cadillac SRX: 2012 (Located in LH dash, check for ID 13580696)
- Chevrolet Camaro: 2012-2014 (Located in RH dash)
- Chevrolet Equinox: 2012 (Located on LH side of dash)
- Chevrolet Spark: 2013 (Located in left lower a-pillar)
- Chevrolet Volt: 2012 (Located in RH engine compartment)
- GMC Terrain: 2012 (Located on LH side of dash)
Frequently Asked Questions
How does the mail-in programming service work?
It’s simple. After you purchase, we will contact you with instructions to ship your original BCM to us. Once we receive it, we clone the data to the replacement module and ship it back to you, typically within 1-2 business days.
Is this better than buying a used BCM from a junkyard?
Absolutely. A junkyard BCM will have the wrong VIN and security data, and it will still require expensive programming at a dealership. Our service provides a module that is pre-programmed specifically for your vehicle, making it a true plug-and-play solution.
Do I need to do any programming myself?
No. The core programming is completely handled by us before we ship the module to you. In some rare cases, a minor relearn procedure like for the brake pedal sensor may be needed, as outlined above.
What if my original BCM is completely dead or missing?
If your original module cannot be read, we may not be able to perform the cloning service. Please contact us before purchasing if your module is severely damaged by fire or water, or if you do not have the original unit.
Is there a core charge?
No, there is no core charge for this service. You are welcome to keep your original module after sending it in for the data transfer.