Restore Your Vehicle’s Brainpower and Performance
Is your Cadillac, Chevrolet, Buick, or GMC suffering from frustrating and difficult-to-diagnose issues? An intermittent check engine light, poor fuel economy, stalling, or a complete no-start condition can often be traced back to a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions. When it fails, the entire system can become unreliable. This pre-programmed ECM, part number 12644446 (also compatible with 12653998, 12633555, and 12655007), is the definitive solution to get your vehicle back on the road and running like new.
From the Diagnostic Bay
We recently had a 2014 Chevy Malibu in the shop that was a real head-scratcher. The owner had replaced the spark plugs, coils, and even the MAF sensor trying to chase down a random misfire and stalling issue. The codes were inconsistent. After hours of diagnostics, we hooked up an oscilloscope to the injector control circuits and found a weak, erratic signal from the ECM. The internal driver for one of the fuel injectors was failing under load. We installed one of our programmed ECMs, and the car ran perfectly immediately. It’s a classic case where throwing parts at a problem costs more time and money than correctly identifying the root cause—a faulty engine computer.
Symptoms of a Failing GM Engine Control Module
- ✔ Persistent Check Engine Light (CEL) with various or no specific codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Complete no-start or hard-starting conditions.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Erratic or harsh transmission shifting.
- ✔ Loss of communication with diagnostic scan tools.
- ✔ Misfire codes that don’t resolve after replacing coils or plugs.
The Perfect Solution: A Programmed 2014-2015 CTS ECM
Don’t risk installing a generic, unprogrammed module from a salvage yard. Modern vehicles have complex security and operating systems that require the ECM to be a perfect match for the car’s specific configuration. Our process eliminates the guesswork and the need for expensive dealership programming. When you purchase this module, you provide us with your vehicle’s VIN. Our technicians then use official GM equipment to flash the unit with the latest factory software specific to your car. This ensures all parameters are correct and any known software bugs from the original release are corrected. The result is a true plug-and-play component that restores original factory performance and reliability.
This ECM is a genuine used part, carefully inspected and tested to ensure full functionality. By using a quality, pre-owned part, you get original equipment reliability at a fraction of the cost of a new module from the dealer.
Broad Compatibility Across the GM Family
While this is a perfect fit for the 2014-2015 CTS ECM requirement, this versatile module is also the correct replacement for a wide range of other GM vehicles, including the Chevy Camaro, Malibu, Equinox, Traverse, Impala; Buick Regal, LaCrosse, Enclave, Verano; GMC Acadia, Terrain; and Cadillac SRX, XTS, and ATS. Please review the detailed fitment list to confirm compatibility with your specific year, make, and model.
Frequently Asked Questions
Is this ECM ready to install out of the box?
Yes! This module is fully programmed to the VIN you provide at checkout. In most cases, it is a direct plug-and-play installation. Some vehicles may require a simple security relearn procedure, which can typically be done without special tools and instructions can be provided.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we have this information to complete the programming.
Will this fix my car’s specific problem?
This ECM will correct any issue directly caused by a faulty engine computer. While the symptoms listed are common indicators of ECM failure, it is crucial to have your vehicle properly diagnosed by a professional to rule out other potential causes like wiring or sensor issues.
Is this a new part?
No, this is a high-quality, tested, and fully functional used ECM sourced from a salvaged vehicle. This allows us to provide a reliable, factory-original part at an accessible price point.
What do the different part numbers mean?
Part numbers 12653998, 12633555, 12655007, and 12644446 are all hardware-compatible service numbers for this module. We will program the module with the correct software for your vehicle regardless of the number on the sticker, ensuring perfect function.