Restore Peak Performance to Your GM Vehicle
Is your truck or car suffering from a persistent check engine light, poor fuel economy, or erratic engine behavior? A failing Engine Control Module (ECM) is often the culprit, disrupting communication between critical systems and leaving you stranded. This genuine GM engine computer, part number 12668991, is the definitive solution to restore your vehicle’s reliability and performance. We take the guesswork out of the repair by professionally programming the module to your vehicle’s unique VIN with the latest GM software updates before it ever leaves our facility. This ensures a seamless installation and gets you back on the road with confidence.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty ECM is the likely cause. This pre-programmed module is designed to be the direct solution for symptoms such as:
- Check Engine Light (CEL) with communication-related DTCs (e.g., P0601, P0606)
- Engine stalling or refusing to start
- Noticeable decrease in fuel efficiency
- Rough or inconsistent idling
- Transmission shifting problems
- Failure to pass emissions testing
Installing this professionally programmed 2012-2016 Silverado 3500 ECM 12668991 is the most reliable way to resolve these complex electronic issues and restore the precise engine management your vehicle requires.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: Arrives ready for installation, flashed with the latest GM software specific to your truck or car. No expensive trip to the dealer needed for programming.
- ✔ Restores Original Functionality: Eliminates frustrating drivability issues and ensures all engine parameters operate within factory specifications for optimal power and efficiency.
- ✔ Direct-Fit OEM Replacement: Guarantees a perfect fit and seamless communication with your vehicle’s existing sensors and modules.
- ✔ Broad Compatibility: While a perfect match for the Silverado and Sierra, this module also fits a wide range of GM vehicles, including the Cruze, Sonic, Express, Savana, and more. See our fitment list for details.
- ✔ Peace of Mind Protection: This unit is backed by our one-year replacement warranty.
Expert Insight: The Power of Proper Programming
As a technician with over two decades of experience, I can’t overstate the importance of correct ECM programming. Many people buy a used module online, only to find it won’t work because it’s still locked to the donor vehicle. Our process eliminates that risk. By flashing the unit with your VIN and the newest GM-certified software, we’re not just making it compatible; we’re often loading software that corrects drivability issues or bugs that were present from the factory. This isn’t just a replacement part; it’s a direct path to making your vehicle run as well—or better—than it ever has.
Frequently Asked Questions
What do I need to do after I place my order?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship your ECM without it. You can typically add this in the notes section at checkout or send it to us in a message referencing your order number.
Is this a simple plug-and-play installation?
This ECM comes programmed to your VIN, which handles the main software compatibility. However, on most GM vehicles, you will still need to perform a security relearn procedure (also known as a CASE relearn or anti-theft relearn) after installation. This procedure syncs the new ECM with your vehicle’s security system and can often be done without special tools. Instructions are widely available online for your specific model.
Does this ECM fit other vehicles besides the 2012-2016 Silverado 3500?
Yes, absolutely. This versatile ECM, part number 12668991, is the correct module for a wide range of GM vehicles, including the Sierra 2500/3500, Express/Savana vans, Chevrolet Cruze, Sonic, Trax, and Buick Encore, among others. Please check the detailed fitment list on this page to confirm compatibility with your exact year, make, and model.
How can I be sure my old ECM is the problem?
While the symptoms listed are strong indicators of ECM failure, proper vehicle diagnostics are always recommended. If you have access to a scanner, codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault) are direct signs of an internal computer failure. If you are unsure, consulting with a professional technician is a good idea.
Where can I find my vehicle’s VIN?
Your VIN is a unique 17-digit code that can be found in several places: on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.