Restore Peak Performance to Your GM Vehicle
Is your 2010-2011 GMC Terrain, Chevy Equinox, or other compatible GM vehicle suffering from perplexing issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition? These are classic signs of a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifts and emissions controls. When it fails, the entire system’s performance and reliability are compromised.
This replacement Engine Control Module, part number 12651993, is the definitive solution to restore your vehicle’s factory performance and dependability. We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store or salvage yard, each unit we ship is professionally programmed with the latest GM-certified software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) during checkout. This ensures that when the part arrives, it’s a true plug-and-play solution, ready to communicate flawlessly with all other modules in your vehicle.
From the Diagnostic Bay
We had a 2011 GMC Terrain come into the shop with a list of complaints that had other mechanics stumped. The owner reported random stalling at stoplights, a check engine light that would come and go with no consistent codes, and a transmission that felt like it was shifting harshly one day and perfectly fine the next. We checked the wiring, sensors, and grounds—everything seemed fine. On a hunch, we monitored the live data stream from the ECM and noticed intermittent signal dropouts from key sensors. The ECM itself was failing internally, causing these ghost-like problems. We installed a VIN-programmed module just like this one, performed the security relearn procedure, and the Terrain ran like it just rolled off the assembly line. It’s a perfect example of how a failing computer can mimic a dozen other mechanical problems.
Is Your Vehicle Exhibiting These Symptoms?
A faulty Terrain Engine Control Module can manifest in numerous ways. If you’re experiencing any of the following, a failing ECM is a likely culprit:
- ✔ Unexplained Check Engine Light (CEL) illumination, often with communication-related trouble codes (U-codes).
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Engine performance issues such as rough idling, stalling, hesitation, or misfires.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent starting problems or a complete no-start condition where the engine cranks but won’t fire.
- ✔ Other warning lights on the dashboard appearing without a clear cause.
- ✔ Failure to pass state emissions testing.
The Right Part, Programmed Correctly
This module is a direct replacement for a wide range of GM vehicles, ensuring a perfect fit and function. It is compatible with multiple original part numbers, including 12616889, 12630908, 12637106, 12642665, and 12650256. By providing your VIN, you guarantee that the software loaded onto this computer is precisely matched to your vehicle’s specific options and build sheet. This critical step prevents compatibility issues that can arise from using a non-programmed or incorrectly programmed module, saving you from frustrating and costly return trips to the repair shop.
Installation is straightforward for a qualified technician or an experienced DIYer. Once installed, a simple security relearn procedure may be required to sync the new ECM with your vehicle’s anti-theft system. This procedure is often detailed in service manuals and can typically be done without specialized scan tools. Getting your vehicle back to its reliable, efficient self has never been easier.
Guaranteed Fitment For Your Vehicle
This Terrain Engine Control Module is engineered to fit a wide array of General Motors vehicles. Please verify your vehicle and engine options below to ensure compatibility. This unit fits:
- Buick Allure (2010): 2.4L & 3.0L Engines
- Buick LaCrosse (2010-2011): 2.4L & 3.0L Engines
- Buick Regal (2011)
- Cadillac CTS (2010-2012): 3.0L & 3.6L Engines
- Cadillac SRX (2010-2011): 3.0L Engine
- Chevrolet Camaro (2012): 3.6L Engine
- Chevrolet Captiva Sport (2012)
- Chevrolet Equinox (2010-2011)
- Chevrolet Impala (2012)
- Chevrolet Orlando (2012-2013)
- GMC Terrain (2010-2011)
- Saab 9-5 (2010-2011): 2.0L Engine
Note: For some models, fitment depends on matching the specific ID number from your original module. Please cross-reference your part number with the list provided (12616889, 12630908, 12637106, 12642665, 12650256, 12651993) to confirm.
Frequently Asked Questions
Do I need to do anything after installing this ECM?
Because this module comes pre-programmed to your VIN, the complex part is already done. However, you will likely need to perform a security relearn procedure (also known as a key relearn or anti-theft relearn). This process syncs the new ECM to your vehicle’s keys and can typically be done in your driveway in about 30 minutes without any special tools. Instructions are widely available online for your specific model.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot program and ship your module until we receive this information. Please ensure the VIN is accurate to avoid any delays.
Is this a new or used part?
This is a high-quality, OEM-grade replacement part that has been thoroughly inspected and tested to meet or exceed original equipment specifications. It is then programmed with the latest software for your vehicle.
Will this ECM fix my vehicle’s problem?
This part is a direct solution for a failed ECM. While the symptoms listed are common for ECM failure, it’s always best to have a proper diagnosis performed by a professional mechanic to confirm the ECM is the root cause of your issues before ordering.
What if I have a different part number on my original module?
This module replaces several part numbers, including 12616889, 12630908, 12637106, 12642665, and 12650256. As long as your original part number is on this list, this module will work for your vehicle once programmed to your VIN.