Restore Your Vehicle’s Brain and Drivability
Is your Buick Encore, Chevy Cruze, or another compatible GM vehicle acting erratically? Frustrating issues like stalling, a persistent check engine light, or a sudden no-start condition often point directly to a failing Engine Control Module (ECM). As the central computer for your engine, a faulty ECM can cause a cascade of problems that are often misdiagnosed. This isn’t just an inconvenience; it’s a critical component for your vehicle’s performance, fuel economy, and reliability. Instead of facing a costly trip to the dealership, we offer a direct, dependable solution.
This is a high-quality replacement Engine Control Module, part number 12643636, which is compatible with a wide array of GM vehicles. The most significant benefit we offer is our professional programming service. Before we ship the part, we flash it with the latest official GM software updates, specifically matched to your car’s Vehicle Identification Number (VIN). This ensures that when it arrives, it’s ready for installation, saving you hundreds in dealer programming fees and getting you back on the road faster. This is the smart, efficient way to solve complex engine management problems.
A Technician’s Notebook: The Intermittent Stall Case
I remember a 2014 Chevy Cruze that came into my bay with a problem that was driving the owner crazy. It would stall randomly at red lights, but not always. They had already replaced the spark plugs and a coil pack with no success. My initial scan showed no hard codes, just a history of a U0100 (Lost Communication with ECM/PCM). After checking the wiring for chafing and finding nothing, experience told me the ECM itself was likely failing internally. The intermittent nature was classic thermal failure—as the module heated up, a connection would break. We installed a VIN-programmed ECM just like this one, and the problem was solved instantly. It’s a reminder that for these complex electronic systems, replacing the core component with a properly prepared one is often the most direct path to a lasting repair.
Is Your Vehicle Showing These Signs of ECM Failure?
A failing ECM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention:
- ✔ Persistent Check Engine Light (CEL) with codes like P0601, P0606, or other internal processor faults.
- ✔ Unexplained drops in fuel economy.
- ✔ Engine stalling, stumbling, or running rough for no apparent reason.
- ✔ Complete no-start or intermittent starting issues.
- ✔ Transmission shifting problems or harsh engagement.
- ✔ Loss of communication with diagnostic scan tools.
- ✔ Seemingly random warning lights appearing on the dash.
A Straightforward Guide to Installation
With our pre-programmed module, the physical installation is something a confident DIYer or any professional mechanic can handle with basic tools. Follow these general steps for a successful replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the system to discharge completely.
- Locate the ECM: On most compatible vehicles like the Encore or Cruze, the ECM is found in the engine bay, often mounted to the side of the engine or firewall. Refer to a vehicle-specific manual if you’re unsure.
- Disconnect and Remove: Carefully unlock and unplug the electrical connectors. They have locking tabs that must be released to prevent damage. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new ECM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Relearn Procedure: While our programming handles the engine parameters, some vehicles may require a simple security or anti-theft relearn procedure. This typically involves a sequence of key turns and can be done without special tools. Instructions are widely available online for your specific model.
Verified Vehicle Compatibility
This module is a direct replacement for a broad range of General Motors vehicles. Please verify your model and options below. This part replaces several part numbers, including: 12668866, 12668994, 12643636, 12663405, 12670335, 22819494, and 12692200.
- Buick Encore (2013-2016) – 1.4L
- Buick ELR (2014-2016)
- Chevrolet Cruze (2012-2016) – 1.4L / Gasoline
- Chevrolet Sonic (2012-2016) – 1.4L
- Chevrolet Spark (2014-2015) – Gasoline
- Chevrolet Trax (2013-2016) – 1.4L
- Chevrolet Volt (2011-2015)
- Chevrolet Silverado 2500/3500 (2012-2016) – 6.0L
- GMC Sierra 2500/3500 & Denali (2012-2016) – 6.0L
- Chevy Express / GMC Savana 2500/3500 Vans (2016) – 4.8L, 6.0L
- Chevrolet Suburban 3500 (2016)
- …and other models listed in the fitment data. Always match your part number or contact us with your VIN to confirm.
Frequently Asked Questions
Do I need to take my car to the dealer after installation?
No. Because we program the module to your vehicle’s VIN before shipping, you will not need a trip to the dealer for software flashing. Some models may require a simple key-cycle security relearn, which you can do yourself in minutes.
How does the VIN programming process work?
After you complete your purchase, you will need to send us your 17-digit VIN. Our technicians use this number to access the latest official GM calibration for your specific vehicle and options. We flash this software onto the module, making it a true plug-and-play part for your car.
Is this a brand new part?
This is a quality, tested OEM part that has been professionally prepared for your vehicle. Each unit is inspected and programmed by our expert technicians to ensure it meets or exceeds original performance standards.
What if my original part number is slightly different?
This module replaces a range of part numbers (e.g., 12668866, 12663405, etc.). As long as your vehicle is on the compatibility list, our VIN programming will ensure it functions correctly, even if the number on your old part differs from 12643636.
What happens if I don’t provide my VIN?
We cannot ship the module until we receive your VIN. The programming is essential for the part to work in your vehicle. Please provide your VIN at checkout or via message to avoid delays.