Restore Your Vehicle’s Performance and Reliability

Is your Chevrolet Impala or other GM vehicle running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These frustrating issues often point to a failing Engine Control Module (ECM), the central computer of your vehicle. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can cause a cascade of problems that are difficult to diagnose. This isn’t just a part; it’s the solution to restoring your engine’s precision, fuel efficiency, and smooth operation.

We take the guesswork and hassle out of the repair. This genuine OEM Engine Control Module is not just a replacement part—it’s a complete, ready-to-install solution. Before we ship it, we flash it with the latest, most stable software updates directly from GM, programmed specifically to your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures perfect communication between the ECM and all other vehicle systems, a service that would otherwise require an expensive trip to the dealership. By providing your VIN at checkout, you receive a part that is truly plug-and-play.

Is Your GM Vehicle Showing These ECM Failure Signs?

A failing ECM can manifest in various ways, from obvious to subtle. If you’re experiencing any of the following, a faulty module is a likely culprit. I’ve diagnosed hundreds of these, and these are the most common symptoms I see in the shop:

• ✔ Unexplained Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
• ✔ Engine stalling, stumbling, or hesitating during acceleration.
• ✔ Noticeable decrease in fuel economy.
• ✔ Rough or inconsistent idling.
• ✔ The engine cranks but refuses to start.
• ✔ Automatic transmission shifting erratically or harshly.
• ✔ Communication errors with diagnostic scan tools.

A Straightforward Guide to Your ECM Swap

Replacing the ECM on many of these GM models is a manageable job for a confident DIYer. Since this module comes pre-programmed, you can avoid the complex dealer tools. Just follow these general steps:

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
2. Locate the ECM: On the 2012 Impala, the ECM is typically mounted to the air cleaner bracket in the engine bay. On other models like the CTS or Captiva, it’s often in the LH or RH side of the engine compartment. Consult a repair manual for your specific vehicle if you’re unsure.
3. Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damage.
4. Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you may need to reuse it.
5. Install the New Module: Mount your new, pre-programmed ECM in place and secure it. Reconnect the electrical harnesses, ensuring they click securely into place.
6. Reconnect the Battery: Reattach the negative battery terminal.
7. Perform Security Relearn (If Necessary): While many vehicles will start right up, some GM models require a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. This allows the new ECM to sync with your vehicle’s anti-theft system.

Confirmed Compatibility: Will This Fit Your Vehicle?

This ECM, part number 12637106, is a direct replacement for a wide range of GM vehicles and interchanges with several other part numbers, including 12616889, 12630908, 12642665, 12650256, and 12651993. Please verify your vehicle from the list below. Providing your VIN is the best way to guarantee a perfect match.

This module fits various engines and model years for: Allure, CTS, Orlando, Impala, LaCrosse, Saab 9-5, Captiva Sport, Regal, Camaro, Terrain, Equinox, and SRX. A proper 2012 Impala Engine Control Module replacement is crucial, and this part covers many other applications as well, ensuring broad compatibility and reliability.