Is Your Chevy Trax Running Rough? It Could Be The ECM.
If your 2013-2016 Chevrolet Trax is suffering from erratic engine behavior, a persistent Check Engine Light, poor fuel economy, or even a no-start condition, the root cause is often a failing Engine Control Module (ECM). The ECM is the brain of your vehicle’s engine, responsible for managing everything from fuel injection and ignition timing to emissions controls and transmission shifting. When it fails, it can create a cascade of frustrating and difficult-to-diagnose problems. This genuine GM engine control module, part number 12668866, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
From the Diagnostic Bay
We had a 2015 Chevy Cruze come in with a persistent P0302 (Cylinder 2 Misfire) code. The owner had already replaced the spark plug, ignition coil, and fuel injector for that cylinder, but the misfire wouldn’t go away. We checked compression, and it was perfect. We even swapped components with another cylinder, and the misfire stayed on cylinder 2. After hours of diagnostics, we hooked up an oscilloscope to the injector and coil driver circuits at the ECM connector. We found that the ECM’s driver for the cylinder 2 ignition coil was failing intermittently under load. It was sending a weak or erratic signal, causing the misfire. We installed one of our VIN-programmed ECMs, performed the security relearn, and the car ran perfectly. It’s a classic case where the problem wasn’t the components, but the computer controlling them.
Symptoms of a Failing 2013-2016 Trax ECM
A faulty engine computer can manifest in numerous ways. If you’re experiencing any of the following issues, it’s a strong indicator that your ECM may need replacement. This module is the correct fix for these common failures.
- ✔ Persistent Check Engine Light (CEL) with various codes that won’t clear.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel mileage.
- ✔ The vehicle cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
- ✔ Unexplained loss of power or poor engine performance.
The Plug-and-Play Solution Your Vehicle Needs
Don’t settle for a used module from a junkyard that will require expensive dealership programming. We simplify the repair process. When you purchase this ECM, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our certified technicians will then flash the module with the latest, most up-to-date software directly from General Motors, ensuring it is perfectly matched to your vehicle’s specific configuration and options. This critical step guarantees proper function of the engine, transmission, and all related systems. The module arrives at your door ready for installation, saving you time and money.
This unit is a direct replacement for multiple part numbers, including 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. It has an extensive application list across the GM family, ensuring broad compatibility. Please verify your part number or consult the fitment list below to confirm this is the correct part for your vehicle.
Guaranteed Fitment For a Wide Range of GM Vehicles:
While this is a primary solution for the 2013-2016 Trax ECM, it also fits many other popular models. Please match your original part number for a guaranteed fit.
- Buick Encore (2013-2016)
- Cadillac ELR (2014-2016)
- Chevrolet Cruze (2012-2016)
- Chevrolet Express 2500/3500 Van (2016)
- Chevrolet Silverado 2500/3500 Pickup (2012-2016)
- Chevrolet Sonic (2012-2016)
- Chevrolet Spark (2014-2015)
- Chevrolet Suburban 3500 (2016)
- Chevrolet Volt (2011-2015)
- GMC Savana 2500/3500 Van (2016)
- GMC Sierra 2500/3500 & Denali (2012-2016)
Frequently Asked Questions
Do I need to do any programming after I receive this ECM?
No. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation. In most cases, you will only need to perform a simple security relearn procedure (often called a key relearn or anti-theft relearn), which can typically be done without special tools and takes about 30 minutes. Instructions can easily be found online for your specific model.
How do I find my original ECM part number?
Your vehicle’s original ECM part number is printed on a sticker directly on the module itself. You will need to locate the ECM in your engine bay to read this number. Matching this number is the best way to ensure you are ordering the correct replacement part.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your specific car. It contains information about the make, model, year, engine, transmission, and factory-installed options. We use this VIN to download the exact factory software from GM for your vehicle, ensuring the new ECM works perfectly upon installation.
Where is the ECM located on a 2013-2016 Chevy Trax?
On the Chevrolet Trax and many similar GM models with the 1.4L engine, the ECM is typically located in the engine compartment, mounted to the side of the engine block or on a bracket near the firewall. It is a silver metal box with several large electrical connectors.
Will this fix my car’s check engine light?
If the check engine light is caused by an internal failure of the ECM, then yes, this part will resolve the issue. However, the check engine light can be triggered by hundreds of other potential problems, such as a bad sensor or a loose gas cap. It is always recommended to have the codes read by a professional or with a code reader to help diagnose the problem before replacing parts.