Restore Peak Performance to Your GM Truck or Vehicle
Is your 2012-2016 Silverado 2500, Sierra 2500, or other compatible GM vehicle suffering from frustrating and unpredictable engine issues? A faulty Engine Control Module (ECM) is often the culprit behind problems like a persistent check engine light, poor fuel economy, rough idling, or even a no-start condition. This vital component is the brain of your engine, and when it fails, it can bring your entire vehicle to a standstill. This replacement Engine Control Module, part number 12643636, is the definitive solution to get your vehicle running reliably again.
The Simple, Dealer-Free Solution
We take the complexity out of ECM replacement. Forget about expensive towing fees and high dealership programming costs. When you order from us, we flash the module with the latest, most stable GM-certified software specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This ensures that when the part arrives, it’s a true plug-and-play solution, pre-configured to communicate perfectly with your truck’s specific systems and options. This is the most efficient way to install a new 2012-2016 Silverado ECM.
From the Diagnostic Bay
We had a 2014 Silverado 2500 with the 6.0L V8 come in with an intermittent stalling issue that no one could figure out. The owner had already replaced the throttle body and multiple sensors, chasing ghosts. After hooking up our diagnostic tools, we noticed erratic data readings from the ECM that didn’t correspond to any single sensor failure. It was clear the processor inside the module was failing under load. We installed one of these VIN-programmed modules, performed a quick security relearn, and the truck ran perfectly. It’s a classic case where throwing parts at a problem costs more than correctly diagnosing the core issue—the ECM itself.
Common Symptoms of a Failing ECM
If your vehicle is experiencing any of the following issues, a failing engine computer could be to blame. Proper diagnosis is always recommended, but these are strong indicators:
- ✔ Persistent Check Engine Light (CEL) with various communication or processor-related fault codes.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ Rough or erratic idling and hesitation during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ The vehicle cranks but refuses to start.
- ✔ Automatic transmission shifting problems.
- ✔ Failure to communicate with OBD-II scan tools.
Guaranteed Compatibility and Wide-Ranging Fitment
This module, identified by part number 12643636, is a direct replacement for a wide array of original equipment part numbers, including 12668866, 12668994, 12663405, 12670335, 22819494, and 12692200. While it is a primary solution for the 2012-2016 Silverado ECM requirement, its versatile programming makes it compatible with numerous other GM vehicles. This includes models like the Chevrolet Cruze, Sonic, Trax, Volt, Express Van, and Buick Encore, as well as the GMC Sierra, Savana Van, and Cadillac ELR. Please verify your part number or consult the fitment list to ensure this is the correct component for your specific application.
Frequently Asked Questions
Do I need to have this ECM programmed by a dealer?
No. We handle the programming for you before we ship the part. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will load the latest GM software for your specific vehicle.
Is the installation difficult?
The physical installation is straightforward for anyone with basic mechanical skills. It involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. After installing the new one, some vehicles may require a simple security relearn procedure (often called a key relearn), which can typically be done without special tools. Instructions are widely available online.
How do I provide my VIN?
You can add your VIN in the notes section at checkout or send it to us in a message after you complete your purchase. We cannot ship your order until we receive the VIN, as the programming is essential.
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. However, if the light is on due to other problems like a bad sensor or a wiring issue, those problems will still need to be addressed separately.
Is this compatible with vehicles other than the Silverado?
Yes, absolutely. This ECM is used in a wide range of GM vehicles, including the GMC Sierra 2500/3500, Chevy Express vans, Chevy Cruze, Sonic, Trax, and Buick Encore, among others. Please check the detailed fitment list on this page to confirm compatibility.