Programmed 2012-2016 Cruze Engine Module ECM PCM 12663405

Restore Your GM Vehicle’s Performance and Reliability

As a mechanic with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a reliable vehicle into a source of constant frustration. If your Chevrolet Cruze, Sonic, Trax, or other compatible GM vehicle is experiencing baffling issues like random stalling, poor fuel economy, a persistent check engine light, or erratic transmission behavior, the problem often traces back to this critical component. The ECM is the brain of your engine, and when it starts to falter, it can cause a cascade of problems that are difficult to diagnose. This isn’t just an inconvenience; it’s a matter of reliability and safety.

This Engine Control Module, part number 12663405, is the definitive solution. We take the guesswork and hassle out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This means you get a component loaded with the latest factory software from GM, ensuring optimal performance and communication with all other vehicle systems. You avoid the costly trip to the dealership for programming and the need for expensive specialized tools. It’s a direct-fit, plug-and-play solution designed to get you back on the road with confidence.

Is Your Vehicle Showing These Telltale Signs?

A failing ECM can manifest in numerous ways. If you’re noticing any of the following, it’s a strong indicator that your engine’s computer may need replacement. This is especially true if you see diagnostic trouble codes (DTCs) like P0601, P0606, or U0100.

• ✔ Unexplained Check Engine Light illumination
• ✔ Engine stalling, stuttering, or misfiring
• ✔ Complete no-start condition where the engine cranks but won’t fire
• ✔ Noticeable decrease in fuel efficiency
• ✔ Harsh or erratic automatic transmission shifting
• ✔ Communication errors with diagnostic scan tools
• ✔ Issues with other electronic systems, like cooling fans running constantly

A Straightforward Guide to Installation

Replacing the ECM is a task many DIYers can handle with basic tools. Our pre-programming service eliminates the most difficult step, but you will need to perform a simple security relearn procedure after installation. Here’s a general guide:

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to ensure all systems are powered down.
2. Locate the ECM: On most compatible vehicles like the Cruze, Sonic, or Trax, the ECM is located in the engine bay, often near the battery or firewall. It’s a silver metal box with multiple large electrical connectors.
3. Disconnect and Remove: Carefully unclip and remove the electrical connectors. Be gentle, as the plastic clips can become brittle over time. Then, unbolt the module from its mounting bracket and remove the old unit.
4. Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the electrical connectors, ensuring they click securely into position.
5. Reconnect the Battery: Reattach the negative battery terminal.
6. Perform Security Relearn (Critical Step): You must perform a simple “key-on” security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows your vehicle’s anti-theft system to recognize the new ECM. Your engine will not start until this is completed.

Guaranteed Fitment for Your GM Vehicle

This module is a direct replacement for a wide range of General Motors cars, trucks, and vans. It replaces multiple original part numbers, including 12668866, 12668994, 12643636, and more. Please verify your vehicle is on the list below. After purchase, simply provide us with your VIN to ensure we program it perfectly for your specific application.