Is Your Buick Encore Running Rough? The Engine Control Module Could Be the Culprit.
If you’re experiencing frustrating issues like a persistent check engine light, poor fuel economy, engine stalling, or a complete no-start condition in your 2013-2016 Buick Encore, a failing Engine Control Module (ECM) is a likely cause. The ECM is the central computer, the ‘brain’ of your vehicle’s engine, responsible for managing everything from fuel injection and ignition timing to emissions controls. When it fails, it can cause a cascade of problems that are often difficult to diagnose, leading to costly and ineffective repairs.
This replacement Engine Control Module, part number 12663405, is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork and hassle out of the replacement process. Unlike a generic module from a dealership or parts store, this unit comes pre-programmed specifically for your vehicle using your VIN. This means it arrives ready for a straightforward, plug-and-play installation, with no need for an expensive trip to the dealer for programming.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on or flashing
- ✔ Engine stalling, stuttering, or misfiring
- ✔ Noticeable decrease in fuel efficiency
- ✔ Difficulty starting the engine or a no-start condition
- ✔ Poor or erratic automatic transmission shifting
- ✔ Loss of power and sluggish acceleration
- ✔ Communication errors with diagnostic scan tools
From the Diagnostic Bay
We had a 2014 Chevy Cruze (which uses this same ECM) come into the shop with a persistent misfire on cylinder 3. The owner had already replaced the spark plug, ignition coil, and fuel injector, but the problem wouldn’t go away. A compression test was good, and wiring checks showed no obvious faults. After hours of diagnostics, we finally scoped the injector driver circuit directly at the ECM connector. We found the signal was weak and erratic. Swapping in a known-good, programmed ECM like this one solved the problem instantly. The internal driver in the original module had failed—a common issue that parts-swapping can’t fix.
Why Choose Our Programmed Encore Engine Module?
Getting your vehicle back on the road quickly and correctly is our priority. This isn’t just a part; it’s a complete solution. When you order from us, you’re getting a quality-tested module loaded with the latest GM-certified software for your specific vehicle. This ensures all engine parameters are set to factory specifications, optimizing performance, emissions, and fuel economy. The process is simple: place your order, provide us with your vehicle’s VIN, and we handle the complex programming before it even ships. Your mechanic—or you, if you’re a skilled DIYer—can then perform the physical installation and any necessary security relearn procedure, getting you back on the road faster.
This module is a direct replacement for a wide range of GM vehicles beyond the Buick Encore, ensuring broad compatibility and OEM-level function. It interchanges with part numbers 12668866, 12668994, 12643636, 12670335, 22819494, and 12692200, making it a versatile solution for many popular models. Please verify the part number or consult the detailed fitment list below to ensure this is the correct component for your vehicle.
Frequently Asked Questions
Is this ECM ready to install right out of the box?
Yes! We program the module with the latest GM software using the VIN you provide. This makes the installation process much simpler. In some cases, a security or anti-theft system relearn procedure may be required after installation, which can often be done without special tools.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship the part until we have this information to complete the programming.
Will this fix my check engine light?
If the check engine light and associated diagnostic trouble codes (DTCs) are caused by a faulty ECM, then yes, this part will resolve the issue. It’s crucial to have a proper diagnosis to confirm the ECM is the point of failure before ordering.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. In most modern vehicles, a single PCM controls both the engine and the transmission. This part serves that function.
Do I need to send my old module (core) back?
This listing does not require a core return. You can keep or dispose of your old module as you see fit.