Restore Peak Performance to Your Vehicle with a Plug-and-Play Solution
Is your Buick Encore, Chevy Cruze, or another GM vehicle acting up? If you’re dealing with frustrating issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition, a failing Engine Control Module (ECM) is often the culprit. As the central computer of your vehicle, the ECM governs everything from fuel mixture and ignition timing to transmission shifting. When it fails, it can cause a cascade of problems that are not only annoying but can leave you stranded. This isn’t just a part; it’s the brain of your engine, and we provide a reliable, straightforward fix.
This replacement Engine Control Module, compatible with part number 12643636, arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). My team and I have seen countless vehicle owners and even professional shops struggle with the high costs and logistical headaches of getting a new module programmed at a dealership. We eliminate that step entirely. By flashing the module with the latest GM-certified software updates before it ships, we ensure it integrates seamlessly with your vehicle’s systems. This is the most efficient way to get your car back on the road, restoring the smooth performance and reliability you depend on.
A Technician’s Notebook: The Intermittent Stall Mystery
A customer brought in a 2014 Chevy Sonic with a 1.4L engine that would intermittently stall at traffic lights—a classic, frustrating problem. No specific trouble codes were stored, just a generic U0100 (Lost Communication with ECM/PCM) that would pop up now and then. We checked wiring, grounds, and power feeds for hours. Everything seemed fine. On a hunch, I tapped the ECM housing with a screwdriver handle while the engine was running, and it immediately stumbled. The problem was an internal fault in the module’s circuit board, a common failure I’ve seen on these E78 controllers. Replacing it with a VIN-programmed unit like this one solved the problem instantly. The customer was back on the road in under an hour, no dealership visit required.
Is Your Vehicle Showing These ECM Failure Signs?
- ✔ Check Engine Light is on with codes like P0601, P0606 (Internal Control Module Processor Error), or communication codes like U0100.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained drop in fuel economy.
- ✔ Rough or unpredictable engine performance, including stalling and misfires.
- ✔ Automatic transmission shifts harshly or at the wrong times.
- ✔ Your scan tool cannot communicate with the PCM.
- ✔ The vehicle is in “limp mode,” with severely reduced power.
A Straightforward Guide to Your ECM Swap
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the ECM: On most supported models like the Encore, Cruze, and Sonic, the ECM is typically found in the engine bay, often mounted to the firewall or an inner fender. For vans and some other models, it may be on the LH rear side of the engine compartment.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Never force them. Inspect the pins for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you will need it for the new module.
- ✔ Install the New Module: Mount your new, pre-programmed ECM in place and secure it with the original hardware. Reconnect the wiring harnesses, ensuring they click securely into place.
- ✔ Reconnect Battery: Reattach the negative battery terminal. Your vehicle may need to complete a security relearn procedure, which can often be done without special tools (consult your owner’s manual or a reliable online resource for your specific model’s procedure). Start the engine and verify the check engine light is off and the vehicle runs smoothly.
Verified Vehicle Compatibility List
This module is a direct replacement for part number 12643636 and is interchangeable with part numbers 12668866, 12668994, 12663405, 12670335, 22819494, and 12692200. It is guaranteed to fit the following vehicles:
- Buick Encore: 2013, 2014, 2015, 2016 (1.4L Engine)
- Buick ELR: 2014-2016
- Chevrolet Cruze: 2012-2015 (Gasoline, 1.4L), 2016 (Limited)
- Chevrolet Sonic: 2012-2016 (1.4L)
- Chevrolet Spark: 2014-2015 (Gasoline)
- Chevrolet Trax: 2013-2016 (1.4L)
- Chevrolet Volt: 2011-2015
- Chevy/GMC Express & Savana Vans (2500/3500): 2016 (4.8L, 6.0L)
- Chevy/GMC Silverado & Sierra (2500/3500): 2012-2016 (6.0L)
- Chevy Suburban 3500: 2016
Do I need to program this module?
Do I need to program this module?
No. We handle all the programming for you. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest GM software specific to your car before shipping it. It arrives ready to install.
What is a VIN and where do I find it?
The VIN (Vehicle Identification Number) is your car’s unique 17-digit serial number. You can typically find it on a small plate on the driver’s side of the dashboard (viewable through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my specific problem or check engine light?
This module will correct issues directly caused by a failing ECM, such as internal processor faults (e.g., P0606) or communication failures. While a faulty ECM is a common cause for many drivability problems, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix issues related to other failed sensors or mechanical components.
What’s 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 unit (the PCM) controls both the engine and the transmission. For this application, the terms refer to the same part.