Is Your Chevrolet Cruze Running Rough?
If your 2012-2016 Chevrolet Cruze, Sonic, or other compatible GM vehicle is experiencing frustrating issues like a persistent check engine light, erratic engine behavior, stalling, or a no-start condition, a failing Engine Control Module (ECM) is a very likely culprit. The ECM is the central computer, the ‘brain’ of your vehicle’s engine management system. It controls critical functions like fuel injection, ignition timing, and emissions systems. When it fails, the entire performance and reliability of your vehicle are compromised.
Don’t let a faulty computer keep you off the road. This replacement ECM, part number 12670335, is the definitive solution to restore your vehicle’s factory performance and efficiency. We take the guesswork and hassle out of the repair process. Unlike a generic module from a parts store or salvage yard, this unit comes fully programmed to your specific vehicle using your VIN. We flash it with the latest, most stable software updates directly from GM, ensuring optimal compatibility and performance right out of the box.
From the Diagnostic Bay
We had a 2014 Chevy Cruze come into the shop with a complaint of intermittent stalling at stoplights and a check engine light that would come and go. The owner had already replaced the spark plugs and an oxygen sensor with no luck. Our initial scans showed a series of seemingly unrelated communication error codes. After running a full diagnostic, we traced the communication faults back to the main computer. The internal circuitry of the original ECM was failing, causing it to send corrupt data to other modules. We installed a VIN-programmed ECM, performed the security relearn procedure, and the car ran perfectly. The intermittent stalling vanished, and all communication codes were cleared. It’s a classic case where chasing individual symptoms can be misleading, and the root cause lies with the central controller.
Symptoms of a Failing Engine Control Module
- ✔ Persistent Check Engine Light (CEL) illumination
- ✔ Engine stalling or shutting off while driving
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Noticeable decrease in fuel economy
- ✔ Rough idling or misfires
- ✔ Poor acceleration and loss of power
- ✔ Transmission shifting problems or harsh shifts
- ✔ Unexplained error codes stored in the system
Why Choose a Pre-Programmed 2012-2016 Cruze ECM?
Replacing an ECM isn’t as simple as swapping out a battery. Modern vehicle computers are tied to the vehicle’s security system (immobilizer) and have specific calibration files for the engine, transmission, and emissions equipment. Our professional programming service handles this critical step for you. By providing us with your VIN during checkout, you receive a module that is ready for installation. This eliminates the need for expensive dealership programming or specialized scan tools, saving you significant time and money. This module is a direct replacement for a wide range of part numbers, including 12668866, 12668994, 12643636, and more, ensuring broad compatibility across various GM models like the Sonic, Volt, Trax, and Encore.
Installation is straightforward: Simply disconnect the battery, remove the old module, install the new one, and reconnect the battery. In most cases, a simple security relearn procedure (often called a ‘key cycle’) is all that’s needed to sync the new ECM with your vehicle’s anti-theft system. Instructions for this procedure are readily available and easy to follow.
Frequently Asked Questions
Do I need to send my old ECM to you?
No, there is no core charge or need to send in your old part. This is a direct replacement that we program and ship to you.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN). Please provide it during or after checkout to ensure we can flash the module with the correct GM software for your specific car.
Is this ECM difficult to install?
Installation is typically simple for someone with basic mechanical skills. It involves disconnecting the battery, unplugging the electrical connectors, unbolting the old unit, and installing the new one. A security relearn procedure is usually required, which can be done without special tools.
Will this fix my specific problem?
This ECM will correct issues directly caused by a faulty engine computer. While the symptoms listed are common for ECM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the ECM is the source of your problem before ordering.
Does this part come with a warranty?
Yes, all of our programmed engine control modules come with a standard warranty. Please check the warranty tab on the product page for specific details and duration.