Is Your GM Vehicle Running Rough? The ECM Might Be the Culprit.
The Engine Control Module, or ECM, is the central computer of your vehicle’s powertrain. It meticulously manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When the ECM begins to fail in your 2012 Buick Regal or other compatible GM model, it can lead to a cascade of frustrating and potentially damaging issues. This replacement ECM, part number 12651994, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
From the Diagnostic Bay
We had a 2012 Chevy Malibu come in with a persistent P0300 random misfire code. The owner had already replaced all the spark plugs, ignition coils, and even the fuel injectors, but the check engine light always came back. After hooking up our diagnostic scanner, we noticed erratic data from the crank sensor, but the sensor itself tested fine. The real issue was a failing driver inside the ECM that was misinterpreting the signals. Installing a VIN-programmed ECM like this one solved the problem instantly. It’s a powerful reminder that sometimes the issue lies with the brain, not the sensors it’s reading.
Common Symptoms of a Failing ECM
If you’re experiencing any of the following issues, a faulty engine computer could be to blame. This part is designed to correct these problems and get you back on the road with confidence.
- ✔ Check Engine Light: The most common sign, often with codes related to internal processor failure (like P0601, P0606) or communication errors.
- ✔ Engine Misfires or Stalling: The ECM may fail to correctly time spark or fuel delivery, leading to a rough-running engine or unexpected stalling.
- ✔ Poor Fuel Economy: Inaccurate sensor readings or faulty calculations can cause the engine to run too rich or too lean, drastically reducing your MPG.
- ✔ No-Start Condition: A completely failed ECM can prevent the fuel pump or ignition system from activating, leaving you stranded.
- ✔ Inconsistent Transmission Shifting: The ECM works with the Transmission Control Module (TCM) to ensure smooth shifts. A faulty ECM can cause harsh or erratic gear changes.
- ✔ Failure to Communicate: If your mechanic’s diagnostic scan tool cannot communicate with the engine computer, it’s a strong indicator of an internal ECM fault.
Why Choose Our VIN-Programmed 2012 Regal ECM?
This isn’t just a generic, off-the-shelf part. We provide a comprehensive solution. When you purchase this ECM, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians then flash the module with the latest, most up-to-date software directly from General Motors, specific to your car’s exact build. This critical step ensures that the computer works seamlessly with your vehicle’s engine, transmission, and all related systems without any compatibility issues. It’s a plug-and-play solution that saves you a costly and time-consuming trip to the dealership for programming.
Wide-Ranging GM Compatibility
While this is a perfect fit for the 2012 Regal ECM, part number 12651994 also serves as a direct replacement for part numbers 12643248 and 12652814. This module fits an extensive list of GM vehicles. Please verify your part number and check the fitment list below to ensure compatibility.
CAMARO 12 3.6L (ID 12643248, 12651994)
CAPRICE 12-13 3.6L
CAPTIVA SPORT 12-13 (LH engine compartment, ID 12643248, 12651994)
CTS 12 3.6L (RH front engine compartment, ID 12641994, 12643248)
CTS 13 3.0L or 3.6L (RH front engine compartment)
CTS 14 Cpe or SW, 3.0L or 3.6L
ENCLAVE 12 (behind fan shroud)
EQUINOX 12 (LH engine compartment)
IMPALA 12 (air cleaner bracket, ID 12641994, 12643248)
IMPALA 13 (air cleaner bracket)
IMPALA 14-16 VIN W (4th digit, Limited)
LACROSSE 12 (LH engine compartment)
MALIBU 13 2.4L (LH engine compartment, ID 12643248, 12651994, 12652814)
ORLANDO 12-13 (LH engine compartment, ID 12643248, 12651994)
REGAL 12 (LH engine compartment)
SRX 12 (LH engine compartment)
TERRAIN 12 (LH engine compartment)
TRAVERSE 12 (behind fan shroud)
VERANO 12-13 2.4L
Frequently Asked Questions
Do I need to get this ECM programmed?
No. This ECM comes pre-programmed to your vehicle’s specific VIN before we ship it. It is ready for installation right out of the box, saving you a trip to the dealership.
What information do you need from me?
After you complete your purchase, you must provide us with your 17-digit Vehicle Identification Number (VIN). This is essential for us to load the correct GM software for your car’s specific options and systems.
Where is the ECM located on a 2012 Buick Regal?
On the 2012 Buick Regal, the Engine Control Module is typically located in the engine compartment on the left-hand (driver’s) side. Always disconnect the battery before attempting to replace any electronic module.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your old ECM, then yes, this part is the correct fix. However, if the light is on due to a faulty sensor or other mechanical issue, you will still need to address that separate problem.
Is any additional setup required after installation?
In most cases, no. Because the unit is programmed to your VIN, it should be a plug-and-play installation. However, some vehicles may require a security relearn or crankshaft position sensor relearn procedure, which can often be done without special tools. Instructions can typically be found online or in a service manual.