Programmed 2012-2016 Sonic Engine Module 12663405 | VIN Matched ECM

Restore Peak Performance to Your GM Vehicle

Is your Chevrolet, GMC, or Buick suffering from frustrating issues like a persistent check engine light, poor fuel economy, stalling, or a complete no-start condition? The Engine Control Module (ECM), the central computer of your vehicle, is often the culprit. When it fails, it can create a cascade of problems that are difficult to diagnose. This replacement 2012-2016 Sonic Engine Module is the reliable, cost-effective solution to get your car or truck running smoothly again, without the exorbitant costs and hassle of a dealership visit.

We take the guesswork and complexity out of the repair. Simply provide us with your vehicle’s VIN during checkout, and our expert technicians will program the module with the very latest GM-certified software specific to your vehicle. This means when it arrives, it’s ready for a straightforward installation, saving you hundreds in programming fees.

Is Your GM Vehicle Showing These ECM Failure Signs?

A failing ECM can manifest in various ways. If you’re experiencing any of the following, this module is likely the solution you need. Look out for:

• ✔ Persistent Check Engine Light (CEL)
• ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0606, or communication errors like U0100.
• ✔ Engine stalling, misfiring, or running rough
• ✔ Unexplained drop in fuel efficiency
• ✔ No-start or hard-starting conditions
• ✔ Transmission shifting problems or harsh shifts
• ✔ The cooling fans running constantly or not at all

A Straightforward Guide to Installation

Installing your new 2012-2016 Sonic Engine Module is a job most DIYers can handle with basic tools. Because we program it beforehand, you skip the most difficult step.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
2. Locate the ECM: On most compatible vehicles like the Sonic or Cruze, the ECM is located in the engine bay, often near the battery or firewall. It’s a silver box with several large electrical connectors.
3. Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
4. Install the New Module: Bolt the new, pre-programmed ECM into place. Firmly reconnect the wiring harnesses, ensuring each connector clicks securely into place.
5. Reconnect Power: Reattach the negative battery terminal.
6. Final Steps: In some cases, a security or anti-theft relearn procedure may be required. This can typically be done without special tools by cycling the key in the ignition. Your vehicle’s service manual will have the specific steps if needed.

Verified Vehicle Compatibility

This ECM is a direct replacement for multiple part numbers, including 12668866, 12668994, 12643636, 12670335, 22819494, and 12692200. It is guaranteed to fit the following models: