Is Your GM Vehicle Experiencing Engine Problems?
If your Buick Regal, Chevy Malibu, Cadillac XTS, or another compatible GM vehicle is suffering from erratic behavior, a persistent check engine light, or a no-start condition, a failing Engine Control Module (ECM) is a very likely culprit. The ECM is the central computer of your vehicle’s engine, managing everything from fuel injection and ignition timing to transmission shifts and emissions. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. Don’t let a faulty computer keep you off the road. This genuine used GM ECM, part number 12644446 (also compatible with 12653998, 12633555, and 12655007), is the reliable and cost-effective solution you need.
The Plug-and-Play Solution: A Programmed 2013-2016 Regal ECM
The biggest hurdle when replacing a modern vehicle’s computer is the programming. A new module from the dealership requires expensive, specialized tools to link it to your vehicle’s Vehicle Identification Number (VIN) and security systems. We eliminate that step entirely. Before we ship this module to you, our technicians will flash it with the latest GM software updates and program it specifically to your vehicle’s VIN. This means that upon arrival, the module is ready for installation right out of the box. Simply disconnect the battery, swap the old module with this one, reconnect the battery, and you’re ready to go. No extra trips to the mechanic or dealer are necessary.
From the Diagnostic Bay
We had a 2014 Chevy Equinox come in that was driving the owner crazy. It would randomly stall at red lights, the transmission would shift hard, and the check engine light would flicker on and off with a dozen different codes that made no sense together. The owner had already replaced the spark plugs, a coil pack, and a sensor with no luck. After hooking up our professional scan tool, we noticed the ECM would periodically lose communication. That’s a classic sign of an internal failure. We installed a VIN-programmed ECM just like this one, and it was like a new vehicle. All the codes vanished, the engine ran smoothly, and the hard shifting was gone. It saved the customer hundreds, if not thousands, compared to chasing down phantom issues or going to the dealer.
Is Your GM Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL) that won’t go away.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ A noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine cranks but refuses to start.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Multiple, unrelated trouble codes stored in the system.
Guaranteed Compatibility and Wide-Ranging Fitment
While this is a perfect replacement 2013-2016 Regal ECM, this versatile E39A service module was used by General Motors across a massive range of vehicles. Please carefully review the fitment list provided to confirm this module is the correct part for your specific year, make, and model. Providing us with your VIN during checkout is mandatory, as it allows us to ensure perfect programming and confirm compatibility, guaranteeing a successful repair.
Frequently Asked Questions
Do I need to have this ECM programmed?
No. We handle all the programming for you before shipment. You simply need to provide your vehicle’s VIN at checkout. The module will arrive ready for installation, with no additional programming required.
Is this a new part?
This is a high-quality, genuine used OEM part sourced from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional before being programmed and shipped.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my car’s specific problem?
This ECM will resolve issues directly caused by a faulty engine computer. While the symptoms listed are common indicators of ECM failure, it’s always recommended to have a proper diagnosis performed by a qualified mechanic to rule out other potential causes like wiring or sensor faults.
Is any other setup required after installation?
In some cases, a security relearn or crank position sensor relearn procedure may be necessary. These are simple procedures that can often be performed without special tools. Instructions can typically be found online or in a service manual for your specific vehicle.
Does this part fit vehicles other than the Buick Regal?
Yes, absolutely. This specific ECM, part number 12644446, was used in a wide variety of GM vehicles, including the Chevy Malibu, Impala, Equinox, Cadillac SRX, GMC Terrain, and many more. Please check the detailed fitment list on this page to confirm compatibility with your vehicle.