Is Your 2012 Impala Running Rough, Stalling, or Showing a Check Engine Light?
If you’re dealing with frustrating engine problems like poor fuel economy, erratic behavior, or a car that just won’t start, the issue often points directly to a failing Engine Control Module (ECM). As a mechanic with over two decades of diagnostic experience, I’ve seen firsthand how a faulty ECM can cause a cascade of confusing issues. It’s the brain of your vehicle’s engine, and when it’s not functioning correctly, nothing else will.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and extra cost out of the repair by pre-programming this module specifically for your vehicle using your VIN. This ensures it has the latest factory software from GM, correcting known bugs and optimizing performance right out of the box.
Expert Pro Tip: Check Before You Replace
Before condemning your old ECM, I always recommend a simple voltage check at the main connector. In my shop, I’ve seen dozens of cases where a corroded ground wire or a loose connection on the main power feed was causing voltage drops that mimicked complete ECM failure. Grab a multimeter and verify you have a solid 12V power supply and a clean ground path. This quick 10-minute check can save you from replacing a part that isn’t actually bad.
Common Symptoms of a Failing 2012 Impala Engine Control Module:
If you’re noticing any of the following, a faulty ECM is the likely culprit:
- โ Persistent Check Engine Light (especially with communication codes like U0100)
- โ Engine stalling, stumbling, or misfiring for no apparent reason
- โ Drastic decrease in fuel mileage
- โ Harsh or incorrect automatic transmission shifting
- โ Complete no-start condition where the engine cranks but won’t fire
- โ Inability for a scan tool to communicate with the engine computer
Plug-and-Play Installation: No Dealer Visit Required
One of the biggest advantages of this module is that it arrives ready for installation. The VIN-specific programming means you can skip the expensive trip to the dealership for flashing. The installation is straightforward for a DIYer with basic tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: On the 2012 Impala, the ECM is conveniently located on the air cleaner housing bracket in the engine bay.
- Disconnect Connectors: Carefully release the locking tabs and unplug the main electrical harnesses from the old module. Inspect the connectors for any corrosion or bent pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed ECM into place.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click, and then reconnect your battery terminal.
- Final Steps: Your vehicle may require a security relearn procedure, which is a simple process that can be done in your driveway and is detailed in your owner’s manual or easily found online.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles. Please verify that your original part number is on this list or that your vehicle is listed below. Upon purchase, simply provide us with your VIN to ensure perfect programming.
Replaces Part Numbers: 12616889, 12630908, 12637106, 12642665, 12650256, 12651993
Fits Select Models Including: Chevrolet Impala, Camaro, Captiva Sport, Equinox, Orlando; Buick Allure, LaCrosse, Regal; Cadillac CTS, SRX; GMC Terrain; and Saab 9-5. Please use the detailed fitment list to confirm compatibility with your specific year, model, and engine.