Restore Peak Performance to Your Vehicle
The Engine Control Module (ECM), often called the engine computer, is the central command center for your vehicle’s engine. It meticulously controls fuel mixture, ignition timing, variable valve timing, and emissions systems to ensure optimal power, efficiency, and reliability. When your original ECM begins to fail, it can lead to a cascade of frustrating and potentially damaging issues, from a simple check engine light to a no-start condition that leaves you stranded. This replacement Engine Control Module, part number 12678512, is the definitive solution to restore your vehicle’s factory performance and operational integrity.
This isn’t just a generic part off the shelf. To guarantee a seamless and correct installation, we program this module specifically to your vehicle using the VIN you provide at checkout. This process loads the latest GM-certified software and vehicle-specific parameters, ensuring it communicates perfectly with all other modules in your car, just as the original did. This eliminates the need for expensive trips to the dealership for programming after installation.
We once had a 2009 Cadillac CTS 6.2L in the shop with a baffling issue. The owner reported intermittent stalling at idle and the transmission would occasionally shift harshly into gear. No consistent codes were stored, just a few random communication errors. After verifying the integrity of the wiring harness and checking all power and ground connections, we monitored the live data stream from the ECM. We noticed the processor would momentarily freeze, causing the erratic behavior. A faulty internal component in the original ECM was the culprit. Installing a correctly programmed 2009 CTS Engine Module like this one resolved all the symptoms immediately, restoring the car’s smooth and powerful operation.
Is Your 2009 CTS Engine Module Failing?
A failing ECM can manifest in various ways, sometimes mimicking other component failures. If you’re experiencing any of the following, your engine module could be the root cause. Proper diagnosis is key, but these are the most common indicators of a faulty computer.
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ A noticeable decrease in fuel economy.
- ✔ The vehicle cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent loss of power or hesitation during acceleration.
- ✔ Communication errors with diagnostic scan tools.
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for a wide range of GM vehicles and is interchangeable with multiple service numbers, including 12636659, 12639300, 12628993, and more. By providing your VIN, you ensure that the unit you receive is perfectly matched to your vehicle’s specific options and systems. For most applications, installation is a straightforward plug-and-play process once the module is programmed. Simply disconnect the battery, unplug the old module, install the new one, and reconnect the battery. In some cases, a security or anti-theft relearn procedure may be necessary, which can typically be done without special tools.
Frequently Asked Questions
Why is my VIN required for this part?
Your Vehicle Identification Number (VIN) allows us to load the exact, vehicle-specific software and calibrations from GM. This ensures the module works correctly with your engine, transmission, and options like cruise control and security systems, making the installation process as simple as possible.
Is this installation plug-and-play?
Yes, because we program the module to your VIN before shipping, it is a plug-and-play installation for most vehicles. After installation, you may need to perform a simple key relearn or security relearn procedure, which is detailed in many online resources for your specific model.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, this part will resolve the issue. It is crucial to have your vehicle properly diagnosed to confirm the ECM is the point of failure and not another sensor or component.
Where is the ECM located on a 2009 Cadillac CTS?
On the 2009 Cadillac CTS with the 6.2L engine, the Electronic Control Module is typically located in the right-hand front of the engine compartment. Always consult a service manual for your specific vehicle to confirm the location before beginning work.
Does this part fit other vehicles besides the Cadillac CTS?
Yes, this module is compatible with a wide range of GM vehicles from 2009-2012, including the Chevy Colorado, GMC Canyon, Hummer H3, Corvette, and more. The programming we perform using your VIN ensures it works correctly for your specific application.