The Brain of Your Engine, Restored
Is your Chevrolet Cruze, Sonic, Trax, or another compatible GM vehicle acting erratically? The Engine Control Module (ECM), often called the Powertrain Control Module (PCM), is the central computer responsible for managing everything from fuel mixture and ignition timing to transmission shifts and emissions control. When it begins to fail, it can cause a cascade of frustrating and seemingly unrelated problems, often leaving you stranded. This replacement ECM, part number 12663405, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
From the Diagnostic Bay
We had a 2014 Chevy Cruze come into the shop with a ghost of a problem. The owner complained of random stalling at red lights and occasional hesitation during acceleration, but the check engine light would only come on intermittently and then disappear. We checked the fuel pump, sensors, and wiring, but everything seemed fine. After hours of diagnostics, we put the original ECM on a bench tester that could simulate engine heat. Sure enough, once the module reached operating temperature, it started failing internally. We installed one of our VIN-programmed ECMs, and the car ran perfectly. It’s a classic example of how a failing computer can mimic a dozen other mechanical issues.
Common Symptoms of a Failing Cruze Engine Control Module
- ✔ Check Engine Light: An illuminated CEL is the most common sign, often with communication error codes (like U0100) or multiple random sensor codes.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire, especially as it warms up.
- ✔ No-Start Condition: Your vehicle may crank but refuse to start due to the ECM not firing the ignition coils or fuel injectors.
- ✔ Poor Fuel Economy: An inefficiently running engine, caused by incorrect ECM calculations, will lead to a noticeable drop in MPG.
- ✔ Erratic Transmission Behavior: The ECM works with the Transmission Control Module (TCM), and a fault can cause harsh shifting, failure to shift, or incorrect gear selection.
- ✔ Loss of Power: You may experience significant hesitation or a lack of acceleration as the ECM fails to manage the engine properly.
The Plug-and-Play Solution: VIN-Programmed for Your Vehicle
Don’t waste time and money at the dealership. The biggest challenge when replacing a modern ECM is the complex software programming required to make it communicate with your specific vehicle. We eliminate this expensive and inconvenient step. When you purchase this module, you simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the unit with the latest, most stable GM-approved software for your exact make, model, and options. This ensures that when the part arrives, it’s ready for a straightforward installation. It will correctly recognize your keys, security system, and all other onboard modules.
This module is a direct replacement for a wide range of GM vehicles and part numbers, including 12668866, 12668994, 12643636, 12670335, 22819494, and 12692200. By programming it to your VIN, we guarantee it functions as the correct part for your application, taking the guesswork out of the repair.
Installation Notes
Installation is typically straightforward. Locate your old ECM, disconnect the negative battery terminal, unplug the wiring harnesses, and unbolt the module. Then, simply install the new module in the reverse order. While our programming handles the vast majority of the setup, some vehicles may require a simple “relearn” procedure after installation, such as a security relearn or a crankshaft position sensor relearn. These procedures can often be performed without specialized tools, and instructions are widely available.
Frequently Asked Questions
Do I need to take this ECM to a dealer for programming?
No. We handle all the programming for you before we ship the part. All we need is your vehicle’s VIN at the time of your order. This saves you hundreds of dollars in dealership fees and towing costs.
What is a VIN and why do you need it?
The Vehicle Identification Number (VIN) is a unique 17-digit code for your specific car. It contains information about the make, model, year, engine, and factory-installed options. We use the VIN to load the exact factory software and calibrations your vehicle requires to run correctly.
Is this a simple plug-and-play installation?
For most vehicles, yes. Our VIN programming makes it a direct replacement. However, on certain models, a security relearn or crankshaft position relearn may be necessary after installation. This is a simple procedure you can often do yourself.
How do I find my current ECM’s part number to verify compatibility?
The part number is printed on a sticker directly on your vehicle’s original ECM. While this unit replaces many part numbers, providing your VIN is the most reliable way to ensure 100% correct functionality.
Will this part fix my check engine light?
This module will resolve any issue directly caused by a faulty ECM. If your check engine light is on due to a failed ECM, this part will correct it. However, it is essential to ensure your vehicle has been properly diagnosed, as a check engine light can also be caused by faulty sensors or other mechanical issues.