Restore Peak Performance to Your Vehicle’s Engine
Is your Chevrolet Sonic, Cruze, or another compatible GM vehicle suffering from perplexing engine issues? The Engine Control Module (ECM), often called the brain of your vehicle, is a critical component responsible for managing everything from fuel mixture and ignition timing to emissions controls and transmission shifting. When it begins to fail, it can cause a cascade of problems that are often difficult to diagnose. This direct-replacement Engine Control Module, part number 12679199, is the definitive solution to get your car running smoothly and reliably again.
This isn’t just a part in a box. We provide a comprehensive service that eliminates the most frustrating part of replacing an ECM: the programming. Each module is professionally flashed with the latest official GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) during checkout. This ensures that when the part arrives, it is a true plug-and-play component. You can avoid expensive towing fees and dealership programming costs, saving you both time and money.
From the Diagnostic Bay
We had a 2012 Chevy Cruze with the 1.8L engine come into the shop with a complaint that was driving the owner crazy. The car would run perfectly fine for 20-30 minutes, but then it would start to hesitate, stutter, and occasionally stall at red lights. No consistent check engine light, just a few random communication codes stored in history. The previous mechanic had already replaced the spark plugs, ignition coil, and even the fuel pump with no success. After running a full diagnostic, we noticed that the live data stream from the ECM would start to drop out and show erratic readings once the engine bay was fully heat-soaked. We suspected the ECM was failing internally under heat. We installed one of our pre-programmed modules, and the problem was solved instantly. The customer was thrilled to have their reliable car back after weeks of chasing ghosts. This is a classic failure pattern for these modules, and a pre-programmed replacement is the fastest, most reliable fix.
Symptoms of a Failing 2012 Sonic ECM
A faulty ECM can manifest in various ways. If you’re experiencing any of the following issues, a failing engine computer could be the culprit:
- ✔ Check Engine Light: The most common indicator, often with codes related to module communication (U-codes), sensor circuits, or processor faults.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire as the ECM fails to properly control ignition and fuel.
- ✔ No-Start Condition: The vehicle may crank but refuse to start because the ECM is not activating the fuel pump or ignition coil.
- ✔ Poor Fuel Economy: Inaccurate signals from the ECM can lead to an inefficient air-fuel mixture, causing a noticeable drop in MPG.
- ✔ Shifting Problems (Automatic Transmissions): The ECM works with the Transmission Control Module (TCM), and a failure can lead to harsh or erratic shifting.
- ✔ Intermittent Electrical Issues: Seemingly unrelated electrical problems can sometimes be traced back to a failing main computer.
Plug-and-Play Simplicity
Replacing an ECM used to be a job reserved for dealerships with expensive diagnostic tools. Our process changes that. By programming the module to your VIN before shipping, we handle the complex part for you. The security information is loaded, and all vehicle-specific parameters are set. This means no additional programming or key relearn procedures are typically required. Simply install the module, and you’re ready to get back on the road. This is the ideal solution for the DIY mechanic or the professional shop looking for a reliable, time-saving part.
Verified Compatibility
This module is a direct replacement for several original part numbers, ensuring a perfect match for your vehicle. It is compatible with part numbers: 12679199, 12642927, 12636386, 12621466, and 12630789. It fits the following vehicles:
- 2011-2012 Chevrolet Cruze (1.8L)
- 2009-2011 Chevrolet Aveo
- 2013 Chevrolet Spark
- 2009-2010 Pontiac Wave
- 2013-2014 Chevrolet Trax (1.8L)
- 2012 Chevrolet Sonic (1.8L)
- 2009-2010 Pontiac G3
Frequently Asked Questions
Do I need to have this ECM programmed by a dealer?
No. We program the module to the VIN you provide before we ship it. This makes the installation plug-and-play, saving you a trip to the dealership and their associated programming fees.
Where do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part. Each unit is verified to be fully functional before being programmed with the latest GM software for your specific vehicle.
Will this fix my car’s problem for sure?
While this module will fix issues directly caused by a faulty ECM, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems related to other bad sensors, wiring, or mechanical components.
What is the difference between an ECM, PCM, and ECU?
These terms are often used interchangeably. ECM (Engine Control Module) and ECU (Engine Control Unit) refer to the computer that controls the engine. PCM (Powertrain Control Module) is a more inclusive term for a module that controls both the engine and the transmission. For this vehicle, the terms effectively refer to the same part.