Is Your Impala Running Rough, Stalling, or Showing a Check Engine Light?
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a reliable car into a source of constant frustration. If your 2017-2020 Impala is experiencing baffling issues like intermittent stalling, poor fuel economy, erratic shifting, or a persistent check engine light that other repairs haven’t fixed, the ECM is a very likely culprit. This isn’t just a part; it’s the brain of your vehicle’s engine, and when it falters, the symptoms can be confusing and widespread.
From the Shop Floor: A Real-World Diagnosis
“Just last month, a 2018 Impala was towed in with a no-start condition. The owner had already replaced the battery and alternator, and another shop suspected a bad fuel pump. My initial scan showed a flurry of communication error codes. Instead of just throwing parts at it, I checked the 5-volt reference signal from the ECM to the main engine sensors. It was dead. The ECM’s internal power regulator had failed, taking the whole network down with it. A new, properly programmed ECM had the car running perfectly in under an hour. This is a classic failure I’ve diagnosed hundreds of times; it often mimics other component failures.”
The Simple, Reliable Solution: A VIN-Programmed ECM
Forget expensive dealership visits and the hassle of coordinating programming. We take care of the most critical step for you. This ECM, part number 12667189, arrives at your door programmed to your specific vehicle using your VIN. We load the latest, most stable software from GM, ensuring optimal performance and compatibility right out of the box. This is the most direct path to getting your Impala back to factory-spec operation.
Why is a Pre-Programmed 2017-2020 Impala ECM the Smart Choice?
- โ No Additional Programming Needed: We handle the complex flashing process. It’s ready for installation upon arrival.
- โ Guaranteed Compatibility: By using your car’s unique VIN, we ensure the software is a perfect match for its specific options and systems.
- โ Latest GM Updates: Your module comes with the newest software, which often corrects factory bugs and improves performance and efficiency.
- โ Fixes Common Issues: Directly addresses symptoms like check engine lights (CEL), communication errors (U-codes), harsh shifting, and no-start conditions related to a faulty computer.
- โ Direct Interchange: This module is a direct replacement for part numbers 12667002, 12666070, and 12667189.
Plug-and-Play Installation: Get Back on the Road Fast
While professional installation is always recommended, swapping the ECM on many of these GM vehicles is straightforward for a skilled DIYer. Follow these general steps for a successful replacement.
- Safety First: Disconnect the negative terminal from your car’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the ECM: On the 2017-2019 Impala, the ECM is typically located in the engine bay. Check your service manual for the exact position.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old ECM. Inspect the pins on both the harness and the new module for any corrosion or damage. Clean them with electrical contact cleaner if necessary.
- Swap the Module: Unbolt the old ECM from its mounting bracket and secure the new one in its place.
- Reconnect Everything: Firmly plug the wiring harnesses into the new ECM until they click. Reconnect the negative battery terminal.
- Perform Relearn Procedure: Start the engine and let it idle for 5-10 minutes. This allows the new ECM to learn the engine’s idle characteristics and other sensors. A short test drive will complete the process.
Guaranteed Fitment for Your GM Vehicle
This Engine Control Module is a confirmed fit for a wide range of GM models. Please verify your part number and vehicle options before ordering.
- 2017-2019 Chevrolet Impala
- 2017 Chevrolet Caprice (3.6L)
- 2017 Chevrolet Traverse
- 2017 Chevrolet Equinox
- 2017-2019 Cadillac XTS (3.6L, LFX)
- 2017 GMC Acadia (Limited)
- 2017 GMC Terrain
- 2017 Buick Enclave
- 2017 Buick Regal
- 2017 Buick Verano
Don’t let a faulty computer keep you off the road. Order this VIN-programmed 2017-2020 Impala ECM today and restore your vehicle’s performance and reliability with confidence.