Restore Peak Performance to Your Chevrolet Impala
Is your 2010 or 2011 Chevrolet Impala running rough, stalling unexpectedly, or displaying a persistent check engine light? These frustrating issues often point to a single, critical component: a failing Engine Control Module (ECM). As the central computer of your vehicle, the ECM governs everything from fuel injection and ignition timing to transmission shifting and emissions control. When it starts to fail, the symptoms can be unpredictable and difficult to diagnose, leaving you stranded and facing costly repair bills. This replacement ECM, part number 12629020, is the definitive solution to get your vehicle back on the road with reliability and confidence.
Diagnosing a Faulty 2010-2011 Impala ECM
A failing engine computer can manifest in numerous ways, often mimicking other sensor or mechanical failures. If you’ve been chasing down issues with no success, it’s time to consider the ECM. A faulty module can cause intermittent problems that are hard to replicate, making diagnosis a challenge even for seasoned technicians. This module is the key to resolving those deep-rooted electronic gremlins and restoring the smooth, dependable operation you expect from your vehicle.
From the Diagnostic Bay
We once had a 2011 Impala come into the shop with a complaint of random stalling at stoplights and a check engine light that would come and go. The owner had already replaced the crankshaft position sensor and the mass airflow sensor with no improvement. After hours of chasing wiring diagrams, we hooked up our scope to the injector control circuits. We found that the ECM was intermittently dropping the ground signal to cylinder 3’s injector, causing the misfire and eventual stall. A new, properly programmed ECM fixed the issue instantly. It’s a classic case of how a failing computer can send you on a wild goose chase for parts you don’t need.
Symptoms of a Failing Engine Computer
- ✔ Check Engine Light: The most common indicator, often with codes related to multiple sensors or communication errors (U-codes).
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, and rough idling.
- ✔ Reduced Fuel Economy: The engine may run too rich or too lean, causing a significant drop in MPG.
- ✔ Engine Stalling or Misfiring: The vehicle may stall for no reason, especially when warm, or experience random misfires.
- ✔ No-Start Condition: The engine may crank but refuse to start, as the ECM fails to control spark or fuel.
- ✔ Harsh or Incorrect Shifting: The ECM communicates with the transmission controller, and a failure can lead to erratic shifting behavior.
- ✔ Communication Issues: A scan tool may be unable to communicate with the ECM, indicating a total failure.
A Simple, Programmed Solution
This isn’t just a part in a box; it’s a comprehensive solution. We take the guesswork and complexity out of the repair by pre-programming this ECM specifically for your vehicle. When you place your order, simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will flash the module with the latest, most stable software updates directly from GM. This ensures that all factory parameters for your Impala’s specific engine, transmission, and options are correctly loaded. The result is a component that is ready for installation right out of the box, eliminating the need for an expensive trip to the dealership for programming.
This module is a direct replacement for service number 12629020 and is also compatible with a wide range of other GM service numbers, including: 12597125, 12612397, 12629019, 12635902, 12611549, 12594750 and more. While this listing focuses on the 2010-2011 Impala ECM, this versatile E38-style computer fits dozens of other GM cars, trucks, and vans from the era, such as the Silverado, Malibu, Cobalt, and HHR. Please verify the part number to ensure proper fitment for your specific application.
Frequently Asked Questions
Do I need to have this ECM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping it to you. This means it is ready for installation upon arrival, saving you time and money. In most cases, a security relearn procedure may be required after installation, which is a simple process you can do yourself in about 15 minutes.
What information do you need from me?
We need your 17-digit Vehicle Identification Number (VIN) to program the ECM correctly. Please provide your VIN during or after checkout to ensure there are no delays in processing your order.
Is this a plug-and-play part?
Yes, for the most part. Once we program it with your VIN, the module will have the correct software for your vehicle’s engine and transmission. After installation, you may need to perform a security relearn (also known as a key relearn) procedure, which pairs the new ECM to your vehicle’s anti-theft system. Instructions for this are readily available online and do not require special tools.
Will this fix my check engine light?
If the check engine light and associated symptoms are caused by a faulty ECM, this part will resolve the issue. It’s crucial to ensure a proper diagnosis has been performed, as other failing sensors or wiring problems can cause similar symptoms.
Where is the ECM located on a 2010-2011 Impala?
On the 2010-2011 Chevrolet Impala, the Engine Control Module is typically located inside the air filter housing assembly (the lower part of the air cleaner box) in the engine bay. This placement helps protect it from excessive heat and vibration.