Is Your Impala Running Rough, Stalling, or Refusing to Start?
If you’re dealing with a persistent Check Engine Light, unpredictable stalling, poor fuel economy, or a no-start condition in your 2017-2019 Chevrolet Impala, a failing Engine Control Module (ECM) is a very likely culprit. As the brain of your vehicle’s engine, when the ECM starts to fail, it can cause a cascade of frustrating and confusing problems. In my 20+ years in the shop, I’ve seen these exact symptoms hundreds of times, and a faulty ECM is often the root cause, especially after ruling out more common issues like sensors or wiring.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and the expensive dealership trip out of the equation. By providing us with your vehicle’s VIN during checkout, we will program this module with the latest, most stable software updates directly from GM. This ensures it communicates perfectly with your Impala’s transmission, body control module, and security system right out of the box.
Expert Pro Tip: Check Your Connections First
Before you’re certain the ECM is the problem, do this simple 5-minute check. Disconnect the negative battery terminal. Then, unplug the main electrical connectors from your old ECM. Shine a bright flashlight into both the harness-side and module-side connectors. I’ve seen cases where a small amount of greenish-white corrosion or a single bent pin was causing intermittent communication faults (like U0100 codes) that perfectly mimicked a dead module. Cleaning the terminals with a dedicated electronic contact cleaner can sometimes save you the cost of a replacement part.
The Simple Solution for a Complex Problem: A Programmed 2017-2019 Impala ECM
Don’t let a bad computer keep your car off the road. This module is a direct-fit replacement, designed to restore the performance and reliability you expect from your vehicle. When you order from us, you’re getting a part that has been meticulously prepared for your specific car.
- โ VIN-Programmed for Your Car: We flash the unit with the latest GM software using your VIN, making it truly plug-and-play.
- โ No Additional Fees: The price you see includes all programming. No hidden dealer charges for flashing.
- โ Restores Original Function: Fixes common issues like stalling, rough idle, harsh shifting, and false sensor codes.
- โ Direct Fit Guarantee: Engineered to match the original form and function for a hassle-free installation.
Plug-and-Play Installation: No Dealer Visit Required
You can perform this replacement yourself with basic hand tools. Here is a general guide to get you started:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the system to discharge.
- Locate the ECM: On most 2017-2019 Impalas, the ECM is located in the engine bay, often near the air filter housing or on the driver’s side fender well.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harness connectors and pull them straight out from the module.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware as you will need it for the new unit.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and securely tighten the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new module until they click firmly into place. Reconnect your negative battery terminal.
- Final Step: Start the vehicle. It may take a moment to idle smoothly as it completes its internal checks. Your Check Engine Light should be off, and the car should run properly.
Part Compatibility Information
This ECM is a direct replacement for the following part numbers:
- 12667002
- 12666070
- 12667189
It is confirmed to fit the following vehicles:
- 2017-2019 IMPALA – Electronic Control Module
- 2017 CAPRICE – Electronic Control Module; 3.6L
- 2017 TRAVERSE – Electronic Control Module; (behind fan shroud)
- 2017-2019 XTS – Electronic Control Module; (3.6L), VIN 3 (8th digit, opt LFX)
- 2017 ACADIA – Electronic Control Module; VIN J (11th digit, Limited), (behind fan shroud)
- 2017 ENCLAVE – Electronic Control Module; (behind fan shroud)
- 2017 REGAL – Electronic Control Module; (LH engine compartment)
- 2017 VERANO – Electronic Control Module
- 2017 EQUINOX – Electronic Control Module; (LH engine compartment)
- 2017 TERRAIN – Electronic Control Module; (LH engine compartment)