Restore Peak Performance to Your General Motors Vehicle
Is your Cadillac ATS, Chevy Silverado, or GMC Sierra suffering from baffling electrical issues, a persistent check engine light, or poor engine performance? The Engine Control Module (ECM), often called the engine’s brain, is the central command unit responsible for managing everything from fuel injection and ignition timing to emissions systems and transmission shifting. When it fails, it can cause a cascade of problems that are often difficult to diagnose. This genuine GM Engine Control Module, part number 12676230, is the definitive solution to restore your vehicle’s factory performance and reliability.
Unlike a generic part from a local store, this module is not just a replacement—it’s a complete, plug-and-play solution. We professionally program the unit with the latest, most stable software updates directly from GM, using your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures that the module communicates flawlessly with all other systems in your vehicle, eliminating compatibility issues and the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2015 Silverado 1500 in the shop that was driving the owner crazy. It had a rough idle and would intermittently stall at stoplights. He had already replaced the spark plugs, ignition coils, and even the mass airflow sensor, but the problem persisted with no clear trouble codes. After hooking up our professional scan tool, we noticed erratic data from the fuel injector circuits. Instead of shotgunning more parts, we inspected the ECM. We found that the driver for injector #3 was failing internally. We installed one of our VIN-programmed ECMs, performed a quick crankshaft position relearn, and the truck ran like it just rolled off the assembly line. It’s a classic case where the root cause was the computer itself, not the parts it was controlling.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Drastic decrease in fuel economy
- ✔ Vehicle won’t start or has hard starting issues
- ✔ Rough or erratic idling
- ✔ Failure to pass state emissions testing
- ✔ Loss of communication with the OBD-II port
- ✔ Unexplained transmission shifting problems
The Importance of a VIN-Programmed 2014-2016 ATS ECM
Modern vehicles are complex networks of computers. The ECM must be perfectly matched to your vehicle’s specific options, engine type, transmission, and emissions equipment. Simply installing a used or non-programmed module will result in a no-start condition or severe performance issues. Our process eliminates this guesswork. By providing your VIN during checkout, you guarantee that the 2014-2016 ATS ECM you receive is prepared specifically for your exact vehicle configuration. This ensures all systems, from the anti-lock brakes to the climate control, function as the manufacturer intended.
This module is a direct replacement for a wide range of popular GM vehicles, including the Cadillac CTS and Escalade, Chevrolet Corvette, Camaro, and Suburban, and the GMC Sierra and Yukon. Please verify your part number and consult the detailed fitment list to ensure compatibility. Installation is straightforward for an experienced DIYer or any professional mechanic. In most cases, it involves disconnecting the battery, unplugging the old module, and installing the new one. Some vehicles may require a simple security or crankshaft position sensor relearn procedure, which can often be completed without specialized tools.
Frequently Asked Questions
Why do I need to provide my VIN?
Your vehicle’s VIN (Vehicle Identification Number) allows us to load the exact, factory-correct software for your specific engine, transmission, and options. This ensures the ECM works perfectly out of the box without needing a trip to the dealer for programming.
Is this a plug-and-play part?
Yes, because we program it to your VIN, it is a plug-and-play installation. On some GM vehicles, you may need to perform a simple security relearn procedure (often called a key relearn) which takes about 30 minutes and requires no special tools. Instructions are readily available online for this process.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. It’s crucial to have your vehicle properly diagnosed to confirm the ECM is the point of failure, as the light can be triggered by many other components.
What if my original part number is slightly different?
This module is compatible with several part numbers, including 12692067, 12656993, and 12672537, among others listed. As long as your original part number is on our cross-reference list, this module will function correctly once programmed to your VIN.
Where is the ECM located on my vehicle?
The location varies by model. On many trucks like the Silverado and Sierra, it’s in the LH front of the engine compartment. On cars like the ATS and CTS, it’s often on the LH side of the engine compartment. For the Corvette, it’s typically located under the dash on the passenger side. Always consult a repair manual for your specific vehicle.