Restore Peak Performance to Your Chevrolet Impala
Is your 2014, 2015, or 2016 Chevrolet Impala suffering from frustrating issues like a persistent Check Engine Light, rough idling, stalling, or a no-start condition? These are classic symptoms of a failing Engine Control Module (ECM), the central computer responsible for managing your vehicle’s engine performance, fuel economy, and emissions. A faulty ECM can disrupt the complex harmony of your engine’s systems, leading to poor drivability and potentially failing an emissions test. This replacement ECM, part number 12644446, is the definitive solution to get your vehicle running smoothly and reliably again.
From the Diagnostic Bay
We had a 2015 Malibu come in with a random misfire code (P0300) that just wouldn’t go away. The previous shop had replaced all the spark plugs, coils, and even the fuel injectors. The car ran okay for a bit, then the light would come back. After hours of chasing wiring diagrams, we decided to scope the injector driver signals directly from the ECM. Sure enough, the signal for cylinder 3 was weak and erratic. The problem wasn’t the injector; it was the computer telling it what to do. A replacement ECM, programmed to the VIN, solved the problem permanently. It’s a reminder that sometimes the issue lies with the brain, not the body.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) illumination
- ✔ Engine stalling or shutting off unexpectedly
- ✔ Rough or inconsistent idling
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Noticeable decrease in fuel efficiency
- ✔ Poor engine performance, hesitation, or misfires
- ✔ Communication errors with diagnostic scan tools
- ✔ Automatic transmission shifting issues
Why Our VIN-Programmed 2014-2016 Impala ECM is the Right Choice
Replacing an ECM isn’t as simple as swapping out a battery. Modern vehicle computers are coded specifically to the Vehicle Identification Number (VIN) of the car they are installed in. This programming ensures the module communicates correctly with all other systems, from the transmission to the anti-lock brakes. Our service eliminates the need for expensive dealership programming. We take a quality, tested, used ECM and flash it with the latest GM-certified software specific to your vehicle’s VIN. This ensures all factory parameters, anti-theft information, and vehicle-specific options are correctly loaded before it even ships.
This unit is a direct replacement for multiple GM part numbers, including 12653998, 12633555, and 12655007. By providing us with your VIN upon purchase, you are guaranteed to receive a module that is precisely calibrated for your vehicle’s engine, transmission, and emissions equipment. This is not a one-size-fits-all solution; it is a tailored component for your car.
Installation and Compatibility
This 2014-2016 Impala ECM is located in the engine compartment, making access straightforward for a DIY mechanic or professional technician. While our programming handles the heavy lifting, some vehicles may require a simple security relearn procedure after installation, which can typically be done without special tools. This procedure pairs the new ECM to your vehicle’s ignition keys and security system. Instructions for this are widely available or can be provided by your mechanic.
While this part is a perfect fit for the 2014-2016 Impala, its versatile architecture means it is also compatible with a wide array of other GM vehicles. Please review the extensive fitment list below and confirm your original part number to ensure compatibility.
Extensive GM Vehicle Compatibility
This module fits dozens of models including the Buick LaCrosse, Regal, Verano, Enclave; Cadillac ATS, CTS, SRX, XTS; Chevrolet Camaro, Captiva Sport, Equinox, Malibu, Orlando, Traverse; and GMC Acadia & Terrain. Always match your original part number for a guaranteed fit.
Frequently Asked Questions
Do I need to program this ECM?
No. The main benefit of our service is that we program the module for you before shipping. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will flash the unit with the correct software for your specific car.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is your car’s unique 17-digit serial number. It contains critical information about the manufacturer, model year, engine type, and factory-installed options. We use the VIN to download the exact GM-approved software calibration for your car, ensuring perfect compatibility.
Is any additional setup required after installation?
In many cases, the vehicle will start and run perfectly after installation. However, some GM vehicles may require a security relearn procedure (also known as a key relearn or anti-theft relearn) to synchronize the new ECM with your keys. This is a simple procedure that typically involves turning the key on and off in a specific sequence.
Is this a new part?
No, this is a high-quality, fully tested used ECM sourced from a salvaged vehicle. Each unit is inspected and verified to be in excellent working condition before being programmed and shipped. This provides a reliable and cost-effective alternative to a brand new module from a dealership.
How can I find my original part number?
Your vehicle’s original ECM part number is printed on a sticker on the module itself. The module is typically a silver metal box located in the engine bay. You will see a multi-digit number, often starting with ’12’. Matching this number is the best way to confirm compatibility.