Restore Peak Performance to Your GM Vehicle
Is your vehicle suffering from a persistent check engine light, poor fuel economy, stalling, or a no-start condition? 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 controls and transmission shifting. When it fails, it can cause a wide range of frustrating and difficult-to-diagnose problems. This genuine GM Engine Control Module, part number 12668986, is the definitive solution to get your vehicle back on the road and running like new.
The Plug-and-Play Solution: Why Our Programmed GM ECM 12668986 is Superior
Don’t waste time and money at the dealership. We take the guesswork and complexity out of replacing your ECM. Unlike a standard replacement part that requires expensive dealer-specific tools for programming, this module arrives at your door fully programmed with the latest official GM software, specifically matched to your vehicle’s 17-digit VIN. This ensures perfect compatibility with all your vehicle’s systems and options right out of the box. All you need to do is install the part and perform a simple security relearn procedure, which we provide clear instructions for.
From the Diagnostic Bay
We had a 2017 Silverado 2500 with the 6.0L V8 in the shop that was a real head-scratcher. The customer complained of intermittent stalling and a check engine light that threw codes for multiple, unrelated sensors—O2 sensor, MAF sensor, even a throttle position sensor code. The owner had already replaced two of the sensors with no change. Our diagnostics showed the sensor circuits were testing fine, which pointed to an internal ECM fault. The processor was failing and sending erratic signals. We installed one of our pre-programmed GM ECM 12668986 units, performed the 30-minute security relearn, and the truck fired up perfectly. All the phantom codes were gone, and the engine ran smoother than ever. It saved the customer hundreds in unnecessary sensor replacements and diagnostic time.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling, misfiring, or running rough
- ✔ Noticeable decrease in fuel economy
- ✔ Complete no-start or hard-starting condition
- ✔ Failure to communicate with diagnostic scan tools
- ✔ Automatic transmission shifting erratically or harshly
- ✔ Unexplained loss of power and performance
Vehicle Fitment Information
This electronic control module is a direct replacement for part numbers 12668986 and 12692201. Please verify your part number before ordering. This part is confirmed to fit the following vehicles with the specified options:
- 2017-2018 Chevrolet Silverado 2500 Pickup: 6.0L Engine
- 2017-2018 Chevrolet Sonic
- 2017 Chevrolet Suburban 3500
- 2017-2018 Buick Encore: 1.4L Engine (VIN B, 8th digit, opt LUV)
- 2017-2018 GMC Sierra 2500 Pickup: 6.0L Engine
Important VIN Programming Information
To ensure 100% compatibility, we program this module using your vehicle’s VIN. After placing your order, please send us a message with your 17-digit VIN. We cannot process and ship your order until we receive this information. This critical step guarantees that the ECM works seamlessly with your vehicle’s specific configuration, including the engine, transmission, and emissions equipment.
Frequently Asked Questions
Do I need to do any programming myself?
No. This ECM arrives fully programmed with the latest GM software for your specific VIN. The only step required after installation is a simple security relearn procedure, which syncs the module to your vehicle’s anti-theft system. We provide easy-to-follow instructions.
What is the security relearn procedure?
It’s a straightforward process that typically takes about 30 minutes and only requires your ignition key. It involves a sequence of turning the key on and off to allow the new ECM to recognize your vehicle’s security credentials.
How do I provide my VIN?
After you complete your purchase, simply send us a message through the platform with your 17-digit Vehicle Identification Number (VIN). You can find this on your vehicle’s dashboard (visible through the windshield) or on your registration/insurance documents.
Is this a new part?
This is a genuine, tested OEM part that has been thoroughly inspected and prepared for your vehicle. It is guaranteed to meet or exceed original factory performance specifications.
Will this fix my car’s problem?
If your vehicle’s issues have been correctly diagnosed as a faulty ECM, this part is the solution. We always recommend a thorough diagnosis by a qualified mechanic to confirm the ECM is the root cause before purchasing.
This module looks the same as mine, but the part number is different. Will it work?
This module is a direct replacement for part numbers 12668986 and 12692201 only. It is critical to match the part number to ensure proper function and compatibility with your vehicle.