Restore Peak Performance to Your Vehicle
Is your Chevrolet Cruze, Sonic, or another GM vehicle suffering from perplexing engine issues? A faulty Engine Control Module (ECM) is often the hidden culprit behind poor fuel economy, rough idling, stalling, or a persistent Check Engine Light. The ECM is the brain of your vehicle’s engine, and when it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. This genuine GM Engine Control Module, part number 12670335, is the definitive solution to restore your vehicle’s factory performance, reliability, 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 arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the latest, most stable software updates directly from GM, ensuring optimal communication between all vehicle systems. This eliminates the need for an expensive trip to the dealership for programming, saving you both time and money.
From the Diagnostic Bay
We recently had a 2014 Chevy Sonic in the shop that was driving its owner crazy. The car would intermittently stall at red lights and had a check engine light for a random misfire (P0300). The owner had already replaced the spark plugs, ignition coil pack, and even an oxygen sensor based on advice from forums, but the problem persisted. After hooking up our professional scan tool and monitoring live data, we noticed the fuel trim values were erratic and unresponsive. Instead of continuing to throw parts at it, we tested the ECM’s driver circuits and found an internal fault. We installed a VIN-programmed ECM just like this one, performed the quick security relearn, and the car ran perfectly. It’s a classic case where the core problem was the computer itself, not the components it was monitoring.
Common Symptoms of a Failing ECM
If your vehicle is exhibiting any of the following signs, a failing engine computer could be the cause. Replacing your old unit with our pre-programmed 2012-2016 Cruze Engine Module can resolve these issues:
- ✔ Persistent and unexplained Check Engine Light (CEL)
- ✔ Engine stalling or shutting off unexpectedly
- ✔ Rough or erratic idling
- ✔ Noticeable decrease in fuel efficiency
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Hesitation or stumbling during acceleration
- ✔ Failed emissions test
- ✔ Communication errors with diagnostic scan tools
The Importance of VIN Programming
Modern vehicles are complex systems where modules are coded to work with one specific vehicle. Installing a non-programmed ECM will result in a no-start condition and multiple error codes. Our process is simple and effective:
- Place Your Order: Add this module to your cart and complete the checkout process.
- Provide Your VIN: Reply to your order confirmation email with your 17-digit VIN.
- We Program & Ship: Our technicians will flash the module with the correct GM software for your exact vehicle configuration and ship it directly to you.
This unit is a direct replacement for a wide range of part numbers, including 12668866, 12668994, 12643636, 12663405, 22819494, and 12692200, ensuring broad compatibility across many GM models such as the Cruze, Sonic, Volt, Trax, Encore, and even some Silverado and Express vans. Please verify the fitment list to confirm compatibility with your specific vehicle.
Frequently Asked Questions
Do I need to have this ECM programmed?
No. We handle all the programming for you before the part is shipped. Simply provide us with your vehicle’s VIN after purchase, and it will arrive ready for installation. This saves you a costly trip to the dealership.
What is a security relearn procedure?
After installation, you may need to perform a simple security relearn (also known as a key relearn or anti-theft relearn). This procedure syncs the new ECM with your vehicle’s existing anti-theft system and keys. It typically takes about 30 minutes and can be done without any special tools. We include instructions to guide you through this straightforward process.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this part will resolve the issue. However, it’s crucial to ensure the underlying cause of the failure (like a shorted sensor or wire) has been fixed to prevent damage to the new module. We always recommend a full vehicle diagnostic before ordering.
Is this a brand new part?
This is a high-quality, tested component that has been meticulously inspected and prepared to meet or exceed original equipment specifications. It is programmed with the latest GM software for reliable, long-lasting performance.