Get Your Sonic Running Right Again
Is your 2012-2016 Chevy Sonic suffering from a persistent Check Engine Light, rough idling, stalling, or abysmal fuel economy? These are classic signs of a failing Engine Control Module (ECM), the computer that acts as your vehicle’s brain. When it starts to malfunction, it can cause a host of frustrating and unpredictable issues, leaving you stranded and facing a costly trip to the dealership. Don’t let a faulty computer dictate your driving experience.
The Simple, Reliable Solution: A VIN-Programmed ECM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a genuine OEM ECM and professionally program it with the latest GM-certified software, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures that the computer communicates perfectly with your Sonic’s engine, transmission, and security systems right out of the box.
- โ VIN-Specific Programming: We flash the module for your exact vehicle. Just provide your VIN after purchase.
- โ No Dealer Visit Needed: Our programming service means you can skip the expensive trip to the dealership for flashing and key relearning.
- โ Restores Performance: A functioning ECM is key to proper fuel delivery, spark timing, and emissions control, restoring lost power and efficiency.
- โ Clears Fault Codes: This is the definitive fix for a wide range of diagnostic trouble codes (DTCs) related to internal processor failure.
Expert Pro Tip: Don’t Get Fooled by a Common Misdiagnosis
In my 20+ years in the shop, I’ve seen countless GM vehicles like the Sonic and Cruze come in with what seems like a bad throttle body or mass air flow sensor. The car hesitates, throws codes for sensor correlation, and runs poorly. Many mechanics will replace those parts, only for the problem to return. More often than not on these 1.4L engines, the root cause is a failing driver circuit inside the original ECM. Before spending money on other sensors, have a trusted technician verify the ECM’s output signals. This simple check can save you hundreds in unnecessary repairs.
Diagnosing a Faulty 2012-2016 Sonic Engine Control Module
If you’re experiencing any of the following symptoms, a failing ECM is the likely culprit:
- โ Check Engine Light is on with no clear cause
- โ Vehicle won’t start or has intermittent starting issues
- โ Noticeable decrease in fuel mileage
- โ Engine stumbles, hesitates, or misfires
- โ Automatic transmission shifts harshly or at the wrong times
- โ Communication errors with diagnostic scan tools
Plug-and-Play Installation: Get Back on the Road Fast
Installing your new ECM is a straightforward process that a confident DIYer can handle. While a security relearn procedure may be required on some models (a simple process you can do yourself), the core programming is done.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: On the Chevy Sonic, the ECM is typically located in the engine bay, often near the battery or firewall.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. Inspect the pins for any corrosion and clean them with contact cleaner if necessary.
- Swap the Modules: Unbolt the old ECM and mount the new one in its place.
- Reconnect Everything: Securely plug the wiring harnesses into your new module and reconnect the negative battery terminal.
- Perform Security Relearn (if needed): Turn the key to the ‘ON’ position for 10-15 minutes, then off, and repeat two more times. This allows the vehicle’s security system to recognize the new ECM. Then, start the engine.
Guaranteed Compatibility
This module, part number 12668991, is a direct replacement for a wide range of GM vehicles and interchanges with the following part numbers: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200. It is guaranteed to fit and function correctly in the specified Chevrolet, Buick, GMC, and Cadillac models listed in the fitment chart, including the Cruze, Trax, Encore, Silverado, and more. By providing your VIN, you ensure a perfect software match for a seamless repair.