Programmed 12668986 ECM for GM Silverado, Sierra, Sonic & More | Plug & Play

Get Back on the Road with Confidence

End the frustration of a faulty engine computer. This ECM is pre-programmed specifically for your vehicle’s VIN, taking the guesswork and expensive dealer visits out of the repair. Enjoy restored performance and peace of mind. Provide your VIN after purchase and we’ll handle the rest!

$349.95

+11.99 USPS Priority Shipping

Availability: In stock



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Restore Your Vehicle’s Brainpower and Get Back on the Road

Is your GM vehicle suffering from frustrating electrical issues, a no-start condition, or a persistent check engine light? A failing Engine Control Module (ECM) can bring your daily routine to a grinding halt, causing poor performance, bad fuel economy, and unpredictable behavior. This is the direct, reliable solution to restore your vehicle’s core functions and get you back behind the wheel with confidence. We provide a fully tested and verified Programmed 12668986 ECM, flashed with the latest GM-certified software specifically for your vehicle’s Vehicle Identification Number (VIN).

Common Symptoms of a Failing ECM & Your Solution

If you’re experiencing any of the following, a faulty ECM is a likely culprit. This module is the definitive solution for these issues:

  • Engine misfires, stumbling, or stalling
  • Drastic decrease in fuel efficiency
  • Check Engine Light (CEL) with various communication or sensor circuit codes (e.g., U0100)
  • Transmission shifting erratically or harshly
  • Failure to start, even with a good battery and starter
  • Inability for a scan tool to communicate with the engine computer

This isn’t just a replacement part; it’s a complete, hassle-free solution. We professionally program this module to your vehicle’s specific VIN, ensuring it arrives ready for installation and communication with your vehicle’s other systems. Stop chasing electrical gremlins and fix the problem at its source with this Programmed 12668986 ECM.

Features & Benefits

  • ✔ VIN-Programmed for Your Vehicle: No need for an expensive trip to the dealership. We flash the unit with the latest GM-certified software using your VIN, ensuring it’s a perfect match for your vehicle’s specific options and systems.
  • ✔ Direct-Fit Replacement: Engineered to replace original part numbers 12668986 and 12692201, guaranteeing a seamless physical installation in your Silverado, Sierra, Sonic, Encore, or Suburban.
  • ✔ Restores Peak Performance: Corrects common issues like rough idling, poor fuel mileage, and erratic shifting by restoring proper engine management and communication between critical components.
  • ✔ Ready for Installation: This module arrives ready to be installed. In most cases, a straightforward security relearn procedure is all that’s needed to get your vehicle running again, saving you time and money.
  • ✔ Backed by a Solid Warranty: Drive with confidence knowing this unit is backed by our one-year replacement warranty.

Expert Insight from a 20-Year Technician:

From a diagnostic perspective, the biggest mistake people make is installing a used, unprogrammed ECM. It’s like putting the wrong brain in. Every vehicle has dozens of unique software calibrations for its specific options—from the type of transmission to the emissions system. Our VIN-specific programming ensures every one of those parameters is set correctly from the start. This isn’t just about starting the engine; it’s about ensuring your anti-lock brakes, fuel system, and gauges all communicate and operate exactly as the factory intended. This Programmed 12668986 ECM eliminates that guesswork entirely.

Frequently Asked Questions

How do I provide my VIN?

After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We need this to load the correct, updated software for your specific vehicle before we ship the part to you.

Is this ECM difficult to install?

The physical installation is typically straightforward, involving disconnecting the battery and swapping the module. However, after installation, you will likely need to perform a security relearn procedure so the vehicle recognizes the new ECM. This procedure is often simple and can be done without special tools.

What is a security relearn procedure?

This is a process that syncs the new ECM with your vehicle’s anti-theft and ignition system. For many GM vehicles, it involves a sequence of turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this two or three times. We recommend searching for the specific procedure for your year and model.

Will this fix my check engine light?

If the check engine light and associated codes are being caused by a faulty ECM, then yes, this part will solve the problem. However, if there are other underlying issues with sensors or wiring in the vehicle, those problems will still need to be addressed separately.

Do I need to send my old part back?

No. There is no core charge or requirement to return your old, non-functioning ECM. You can dispose of it responsibly.

Which vehicles will this part fit?

This ECM is compatible with several GM models, including the 2017-2018 Silverado 2500 & Sierra 2500 (6.0L), 2017-2018 Sonic, 2017-2018 Encore (1.4L, VIN B), and the 2017 Suburban 3500. Always match part numbers 12668986 or 12692201 to ensure compatibility.

Genuine OEM

Yes

Year
Interchange part number

Condition

Seller refurbished

Model

express 3500

Year

2017

Brand

GM

MPN

12668986

Manufacturer Part Number

,

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