Restore Peak Performance to Your GM Truck or Car
Is your 2012-2016 GMC Sierra 3500, Silverado, or other compatible GM vehicle suffering from perplexing issues like poor fuel economy, erratic shifting, a persistent Check Engine Light, or even a no-start condition? The Engine Control Module (ECM), often called the brain of your vehicle, is frequently the source of these frustrating problems. It governs everything from fuel injection and ignition timing to transmission control and emissions systems. When it fails, the entire vehicle’s performance suffers. This replacement Engine Control Module, part number 12668866, is the definitive solution to restore your vehicle’s factory performance and reliability.
The Plug-and-Play Solution You Need
Don’t waste time and money on a trip to the dealership for expensive programming. We take the hassle out of the repair process. When you purchase this module, we will flash it with the latest, most up-to-date OEM software from General Motors, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This ensures perfect compatibility and function right out of the box. All you need to do is provide us with your VIN after purchase, and we handle the complex programming before it ever ships. This makes installation straightforward, getting you back on the road faster.
From the Diagnostic Bay
We had a 2014 Silverado 2500 with the 6.0L V8 come in on a tow truck. The owner had spent a fortune chasing what he thought was a fuel pump issue. The truck would crank but not start, and when it did, it ran terribly for a few seconds before stalling. He had replaced the pump, filter, and even the fuel pressure regulator. After connecting our diagnostic tool, we saw no communication with the ECM. A quick check of the power and ground circuits to the module confirmed they were good. The culprit was a failed internal processor in the original ECM. We installed one of our VIN-programmed modules, performed the quick security relearn, and the truck fired up instantly and ran perfectly. It’s a classic case where a central component failure mimics symptoms of many other parts.
Is Your Vehicle Showing Signs of a Failing ECM?
A faulty Engine Control Module can manifest in numerous ways. If you’re experiencing any of the following symptoms, a failing ECM could be the cause. This 2012-2016 Sierra 3500 ECM is designed to correct these exact issues.
- ✔ Persistent and unexplained Check Engine Light (CEL)
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Noticeable decrease in fuel efficiency
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass emissions testing
- ✔ Complete no-start or intermittent starting problems
- ✔ Communication errors with diagnostic scan tools
Guaranteed Fitment and Compatibility
This module is a direct replacement for a wide range of General Motors vehicles, ensuring broad compatibility. It replaces multiple original part numbers, including 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. While it is a perfect fit for the 2012-2016 Sierra & Silverado 2500/3500 with the 6.0L engine, it also fits many other models such as the Chevy Cruze, Sonic, Trax, Volt, Buick Encore, and Express/Savana vans. By providing your VIN, you guarantee that you receive a module programmed for your vehicle’s specific options and systems.
Replacing your failing computer is a critical repair. Trust this professionally programmed 2012-2016 Sierra 3500 ECM to be the reliable, long-term heart of your vehicle’s engine management system. Order today, provide your VIN, and get ready for a simple installation that brings your vehicle back to life.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. We handle all the programming for you before we ship the part. Simply provide us with your vehicle’s VIN during or after checkout, and we will flash the module with the latest GM software for your specific vehicle.
What is a security relearn, and will I need to do one?
A security relearn, or anti-theft relearn, syncs the new ECM to your vehicle’s existing keys and security system. Most GM vehicles require this simple procedure, which typically takes about 30 minutes and does not require any special tools. We include easy-to-follow instructions with your order.
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 ensure that the codes stored in the computer are not pointing to other failing sensors or components before ordering.
Is this a direct replacement for my original part?
Yes, this module is a direct-fit replacement for multiple OEM part numbers, including 12668866, 12668994, 12643636, and more. It is physically identical and will mount in the factory location with the original hardware and connectors.
How do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.