Restore Peak Performance to Your GM Vehicle
Is your Chevrolet Trax, Cruze, or Sonic suffering from mysterious engine problems, poor fuel economy, or a persistent Check Engine Light? The Engine Control Module (ECM), often called the vehicle’s main computer, is the brain behind your engine’s operation. When it begins to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues. This genuine GM Engine Control Module, part number 12668991, is the definitive solution to restore your vehicle’s factory performance, drivability, and reliability.
Diagnosing a Faulty Engine Control Module
A failing ECM can mimic many other component failures, making diagnosis tricky. However, certain patterns often point directly to the main computer. If you’ve checked sensors and wiring but are still facing inconsistent performance, it’s time to consider the ECM. A faulty module can disrupt everything from fuel injection timing and spark delivery to transmission shift points and emissions control systems.
From the Diagnostic Bay
We had a 2015 Chevy Trax come in that was driving the owner crazy. It would intermittently stall at red lights, the gauges would flicker, and it threw a random assortment of communication error codes (U-codes) that made no sense together. The owner had already replaced the battery and alternator. After hours of checking grounds and network wiring, we hooked up a scope to the main data lines at the ECM. We found the signal was noisy and dropping out, but only when the engine was hot. A thermal issue inside the original ECM was causing the entire vehicle network to crash. Swapping in a properly programmed module like this one solved every single issue instantly. It’s a great reminder that the ECM is the foundation of the entire vehicle’s electronics.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light: The light is on, and you may have codes related to module communication, memory, or processor faults (e.g., P0601, P0606).
- ✔ Engine Stalling or Misfiring: The engine may stall for no reason, run rough, or misfire, especially as it warms up.
- ✔ No-Start Condition: The engine cranks but refuses to start, indicating a potential loss of spark or fuel injector control from the ECM.
- ✔ Poor Fuel Economy: A failing module can’t efficiently manage the air-fuel mixture, leading to a noticeable drop in MPG.
- ✔ Transmission Shifting Problems: The ECM works with the Transmission Control Module (TCM) to ensure smooth shifts. Erratic or harsh shifting can be a symptom.
- ✔ Intermittent Electrical Issues: Seemingly unrelated problems like flickering dash lights or malfunctioning accessories can sometimes be traced back to a faulty ECM.
The Perfect Solution: A VIN-Programmed 2013-2016 Trax ECM
Don’t settle for a generic, unprogrammed module that will require expensive dealer intervention. We take the guesswork and hassle out of the repair. When you purchase this 2013-2016 Trax ECM, we use the Vehicle Identification Number (VIN) you provide to flash the module with the latest, most stable software updates directly from General Motors. This ensures that the computer is a perfect match for your vehicle’s specific configuration, including its engine, transmission, and factory options. The result is a simple, direct-fit installation process that gets you back on the road faster.
This module is a direct replacement for a wide range of part numbers, including: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. It fits an extensive list of GM vehicles beyond the Trax, such as the Cruze, Sonic, Encore, Volt, and even some Silverado and Express van models. Please verify your part number or consult the detailed fitment list to confirm compatibility.
Frequently Asked Questions
Do I need to do any additional programming after installation?
In most cases, no. We program the module to your VIN, which covers the engine and transmission operating software. However, some vehicles may require a security relearn procedure (often called a key relearn or anti-theft relearn) which can typically be done without special tools. Instructions are readily available online for most GM models.
How do I provide my VIN number?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is specific to your exact vehicle.
Is this a plug-and-play part?
Yes, because we program it to your VIN, it is designed to be a direct replacement. Once you perform any necessary security relearn, the vehicle should start and run correctly. No trip to the dealership for programming is required.
Will this fix my car’s specific problem?
This ECM will correct any issues directly caused by a faulty original ECM. While the symptoms listed are common indicators of ECM failure, it’s essential to have your vehicle properly diagnosed. This part will not fix problems related to other bad sensors, wiring, or mechanical components.
Where is the ECM located on my 2014 Chevy Trax?
On the Chevrolet Trax and many similar models like the Sonic and Cruze with the 1.4L engine, the ECM is typically mounted on the driver’s side of the engine block, below the intake manifold. Always disconnect the battery before attempting to remove or install the module.