Restore Peak Performance to Your Chevrolet Impala
The Engine Control Module (ECM), often called the Powertrain Control Module (PCM), is the electronic brain of your 2010-2011 Chevrolet Impala. It meticulously manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When this critical component begins to fail, it can cause a cascade of frustrating and potentially damaging issues, leaving your vehicle unreliable. This replacement ECM, part number 12629020, is the definitive solution to restore your vehicle’s original performance, drivability, and efficiency.
We take the guesswork and complexity out of the replacement process. Unlike a generic module from a salvage yard, this unit is professionally programmed with the latest GM-certified software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at the time of purchase. This ensures that when the module arrives, it is a true plug-and-play solution, ready to communicate flawlessly with all other systems in your Impala. This service eliminates the need for expensive dealership programming or specialized tools, saving you both time and money.
We had a 2011 Impala come in with a complaint of intermittent stalling and a persistent U0100 ‘Lost Communication with ECM/PCM’ code. The check engine light would come and go, and the car was becoming a real headache for the owner. We checked all the basics—power, grounds, and the CAN bus network wiring—and everything looked solid. On a hunch, we tapped on the ECM housing while monitoring live data, and sure enough, the data stream would drop out. It was a classic case of internal ECM failure due to heat cycles and vibration over the years. Swapping in a VIN-programmed module like this one had the car running perfectly in under an hour, solving a problem that had plagued the owner for months.
Signs of a Failing 2010-2011 Impala ECM
A faulty engine computer can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your ECM could be the culprit. A proper diagnosis is always recommended, but these are strong indicators that your vehicle’s central computer is struggling.
Common Symptoms of a Faulty ECM
- ✔ Check Engine Light: The most common sign. You may see codes related to module communication (U-codes), sensor reference voltage, or multiple, seemingly unrelated sensor failures.
- ✔ No-Start or Hard-Start Condition: The ECM controls the fuel pump and ignition coils. If it fails to send the correct signals, the engine may crank but refuse to start.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, and rough idling can all point to an ECM that is not correctly managing the engine’s parameters.
- ✔ Reduced Fuel Economy: If the module isn’t calculating the optimal air-fuel mixture, your gas mileage can drop significantly without any change in your driving habits.
- ✔ Erratic Transmission Shifting: The ECM works in tandem with the Transmission Control Module (TCM). A faulty ECM can send incorrect data, leading to harsh shifts, delayed engagement, or getting stuck in a single gear.
- ✔ Intermittent Stalling: The engine may stall for no apparent reason, either while driving or at idle, and may or may not restart immediately.
This module is a direct replacement for service numbers 12597125, 12612397, 12594750, 12629019, 12635902, and 12611549, and fits a wide range of other GM vehicles beyond the Impala. Please review the detailed fitment list to confirm compatibility with your specific make, model, and engine option. By providing your VIN, you guarantee a perfectly matched and updated component for your exact application.
Frequently Asked Questions
Is this ECM difficult to install?
For most models, including the 2010-2011 Impala, the ECM is located in the lower part of the air cleaner box, making it relatively accessible. Installation typically involves disconnecting the battery, unplugging the electrical connectors, removing the old module, and installing the new one. Since our module comes pre-programmed to your VIN, no further software flashing is needed. However, a security relearn or CASE relearn procedure may be required, which can often be done without special tools. We recommend consulting a service manual for your specific vehicle’s procedure.
What does ‘programmed to my VIN’ mean?
Your vehicle’s VIN contains specific information about its engine, transmission, emissions systems, and other options. Programming the ECM with your VIN ensures that the module’s software is an exact match for your car’s factory configuration. This is crucial for proper engine and transmission function, and it prevents compatibility issues that can cause check engine lights or performance problems.
Will I need to do anything after installation?
In many cases, you will need to perform a security relearn procedure (also known as a Passlock or anti-theft relearn). This syncs the new ECM with your vehicle’s anti-theft system and allows the car to start. This procedure can typically be done by cycling the ignition key and does not require a scan tool. Some vehicles may also require a Crankshaft Variation Relearn (CASE relearn) to clear a P1336 code, which does require a capable bidirectional scan tool.
Is this compatible with other GM vehicles?
Yes. While this listing is focused on the 2010-2011 Impala, this ECM hardware is used across a wide variety of GM cars, trucks, and vans, including models like the Silverado, Malibu, Cobalt, HHR, and G6. Please check the detailed fitment list in the description to ensure it matches your exact vehicle and engine option before ordering.
What information do you need from me?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We cannot program and ship your ECM without it. The VIN is typically found on your driver’s side dashboard (visible through the windshield) or on the driver’s side door jamb sticker.