Is Your 2017 Regal Running Rough? The ECM Might Be the Culprit.
The Engine Control Module (ECM), often called the engine computer, is the electronic brain of your 2017 Buick Regal. It’s a sophisticated piece of hardware that controls a vast network of sensors and systems, including fuel injection, ignition timing, emissions controls, and transmission shifting. When it functions correctly, your vehicle runs smoothly, efficiently, and reliably. However, when the ECM begins to fail, it can cause a cascade of confusing and frustrating problems that can be difficult to diagnose.
A failing ECM can mimic other issues, leading to costly and unnecessary repairs of perfectly good components. If you’ve been chasing down electrical gremlins or persistent performance problems without success, it’s time to consider the core of your vehicle’s management system. This replacement ECM, part number 12666070, is the definitive solution to restore your vehicle’s factory performance and reliability.
From the Diagnostic Bay
We had a 2017 Buick Regal come into the shop with a complaint of intermittent stalling at stoplights and a persistent check engine light with a random misfire code that would jump between cylinders. The owner had already replaced the spark plugs, ignition coils, and even the mass airflow sensor at another shop, but the problem persisted. After hooking up our professional scan tool and monitoring live data, we noticed erratic fuel trim and ignition timing values that didn’t correspond with engine load. This pointed us directly to the central processor – the ECM. A faulty processor was sending incorrect commands, causing the engine to stumble. We installed a VIN-programmed ECM, performed the security relearn, and the car ran perfectly. It’s a classic case of how a failing computer can send you on a wild goose chase, and why getting the right, correctly programmed part is crucial.
Common Symptoms of a Failing 2017 Regal ECM
- ✔ Check Engine Light: The most common indicator. The light may be on constantly or intermittently, often with communication-related or processor fault codes (e.g., P0606).
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, misfire, or run rough, especially under load or at idle.
- ✔ No-Start Condition: In severe cases, the vehicle may crank but refuse to start because the ECM isn’t commanding the fuel pump or ignition system.
- ✔ Poor Fuel Economy: An ECM sending incorrect fuel mixture commands can cause a sudden and significant drop in your MPG.
- ✔ Erratic Transmission Behavior: The ECM works with the Transmission Control Module (TCM). A faulty ECM can cause harsh shifting, failure to shift, or incorrect gear selection.
- ✔ Performance Issues: You may notice a general lack of power, poor acceleration, or hesitation when you press the gas pedal.
The Plug-and-Play Solution: VIN-Programmed for Your Vehicle
Replacing an ECM isn’t as simple as swapping out a battery. Modern vehicle security systems require the ECM to be programmed specifically to your car’s unique Vehicle Identification Number (VIN). Bypassing this step will result in a no-start condition. Our service eliminates the need for expensive dealership programming or specialized tools. When you purchase this 2017 Regal ECM, we handle the critical programming for you. Simply provide us with your VIN during checkout, and our technicians will flash the module with the latest, most stable GM-approved software for your exact vehicle configuration. This ensures that when the part arrives, it’s ready for installation and will communicate seamlessly with your car’s other modules.
Installation and Compatibility
This Engine Control Module is located in the left-hand (driver’s side) engine compartment of your 2017 Buick Regal. While the physical installation is straightforward for a competent DIY mechanic, please follow all safety precautions. Always disconnect the negative battery terminal before beginning work. After installation, some vehicles may require a simple security relearn procedure (often called a ‘key cycle relearn’), which can typically be done without any special tools. Instructions for this are widely available online or in service manuals.
This module is a direct replacement for part number 12666070 and is also compatible with the following interchangeable part numbers: 12667002 and 12667189.
Guaranteed Fitment for a Wide Range of GM Vehicles
While this is a perfect solution for your 2017 Buick Regal, this versatile ECM also fits a variety of other GM models. Please verify your part number and vehicle options to ensure compatibility.
- Buick Enclave: 2017 (behind fan shroud)
- Buick LaCrosse: 2017-2019
- Buick Regal: 2017 (LH engine compartment)
- Buick Verano: 2017
- Cadillac XTS: 2017-2019 (3.6L, VIN 3)
- Chevrolet Caprice: 2017 (3.6L)
- Chevrolet Equinox: 2017 (LH engine compartment)
- Chevrolet Impala: 2017-2019
- Chevrolet Traverse: 2017 (behind fan shroud)
- GMC Acadia: 2017 (Limited, VIN J, behind fan shroud)
- GMC Terrain: 2017 (LH engine compartment)
Frequently Asked Questions
What is VIN programming?
VIN programming is the process of loading your car’s specific Vehicle Identification Number and software onto the ECM. This is essential for the module to communicate with your car’s security system and other electronics. We do this for you before shipping, so it’s ready to install.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information.
Will I need to do anything else after installing this ECM?
In many cases, the module is plug-and-play. However, some GM vehicles may require a simple security relearn procedure, which involves a series of key turns. This does not require a special scan tool. We recommend searching for the specific procedure for your model year.
Is this a new or used part?
This is a high-quality, tested, and guaranteed functional used OEM part. Each unit is inspected and then programmed with the latest software for your specific vehicle to ensure optimal performance and reliability.
What if my part number is slightly different?
This ECM is a direct replacement for part numbers 12666070, 12667002, and 12667189. If your part number is not on this list, please contact us to ensure you are ordering the correct module for your vehicle.