Is your 2012-2016 Chevrolet Sonic, Cruze, or other compatible GM vehicle experiencing perplexing issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition? These are classic signs of a failing Engine Control Module (ECM), the electronic brain of your vehicle. A faulty ECM can cripple your car’s performance, fuel economy, and reliability. This replacement Engine Control Module, part number 12663405, is the definitive solution to restore your vehicle’s factory performance and get you back on the road with confidence.
Unlike generic modules that require expensive and time-consuming trips to the dealership for programming, this ECM arrives at your doorstep fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We use the latest official GM software updates to ensure perfect compatibility and optimal performance, eliminating the guesswork and additional costs. This plug-and-play solution is designed for a straightforward installation, allowing you to get your vehicle running smoothly again without delay.
From the Diagnostic Bay
We had a 2014 Chevy Cruze come in with a P0606 code (ECM/PCM Processor Fault) and a complaint of intermittent stalling at traffic lights. The owner had already replaced the spark plugs and an oxygen sensor with no luck. After confirming power and grounds to the module were solid, we knew the internal processor was failing. Instead of a costly dealer visit, we installed one of our VIN-programmed modules. The car started immediately, the code was gone, and the stalling issue was completely resolved. It’s a reminder that when the brain of the engine is failing, swapping parts elsewhere is often a waste of time and money.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light: The most common indicator, often with communication-related or processor fault codes (e.g., U-codes, P06xx codes).
- ✔ Engine Stalling or Misfiring: The ECM may fail to correctly manage fuel injection or ignition timing, leading to poor engine performance.
- ✔ No-Start Condition: The vehicle cranks but won’t start because the ECM isn’t activating the fuel pump or ignition system.
- ✔ Poor Fuel Economy: Incorrect sensor readings or calculations can cause the engine to run too rich or too lean, drastically reducing MPG.
- ✔ Shifting Problems (Automatic Transmissions): The ECM works with the Transmission Control Module (TCM), and a fault can lead to harsh or erratic shifting.
- ✔ Intermittent Electrical Issues: Fans running constantly or other strange electronic behavior can sometimes be traced back to a failing ECM.
Why a VIN-Programmed 2012-2016 Sonic Engine Module is Essential
Your vehicle’s ECM is not a one-size-fits-all component. It is specifically calibrated for your car’s engine, transmission, emissions equipment, and factory options. Our professional programming service ensures that the replacement 2012-2016 Sonic Engine Module you receive is a perfect digital match for your car. This process involves flashing the unit with the correct GM-certified software using your VIN. This critical step ensures all systems communicate correctly, from the anti-theft system (Passlock/VATS) to the fuel injectors, preventing a host of potential issues that arise from using a non-programmed or incorrectly programmed module.
This module is a direct replacement for a wide range of GM vehicles and part numbers, including 12668866, 12668994, 12643636, 12670335, 22819494, and 12692200. Please review the detailed fitment list below to confirm compatibility with your specific make, model, and year. After purchase, simply provide us with your VIN, and our technicians will handle the rest, shipping you a part that is ready for installation.
Wide Range of Compatibility
This versatile ECM fits a large number of popular GM vehicles, making it a reliable solution for many owners. Compatible models include:
- Chevrolet Cruze (2012-2016)
- Chevrolet Sonic (2012-2016)
- Chevrolet Trax (2013-2016)
- Chevrolet Volt (2011-2015)
- Chevrolet Spark (2014-2015)
- Buick Encore (2013-2016)
- Cadillac ELR (2014-2016)
- GMC/Chevrolet Trucks & Vans (2012-2016 with 4.8L/6.0L engines)
Please verify your original part number or consult the detailed fitment list to ensure this is the correct part for your application.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is essential for the part to function in your vehicle.
Is any additional programming required after installation?
No. This ECM comes fully programmed to your VIN with the latest GM software. In most cases, it is a plug-and-play installation. Some vehicles may require a simple security relearn procedure, which can be done without special tools and instructions can be provided.
Is this a new or used part?
This is a high-quality, tested, and guaranteed functional used OEM part. Each unit is inspected and then programmed by our expert technicians to ensure it meets or exceeds factory specifications.
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 is crucial to have your vehicle properly diagnosed to confirm the ECM is the point of failure before ordering. This part will not fix issues related to other faulty sensors or mechanical problems.
What is the warranty on this part?
This part comes with our standard warranty, guaranteeing it against defects in function. Please see our store’s warranty policy page for complete details on coverage and duration.