Restore Peak Performance to Your Cadillac CTS
Is your 2010, 2011, or 2012 Cadillac CTS suffering from perplexing issues like stalling, rough idling, poor fuel economy, or a dreaded no-start condition? The Engine Control Module (ECM), the central computer of your vehicle, is often the culprit. This vital component manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, it can cause a cascade of problems that are difficult to diagnose. This replacement 2010-2012 CTS Engine Module is the definitive solution to get your luxury sedan running smoothly and reliably again.
This isn’t just a generic, off-the-shelf part. We provide a fully plug-and-play solution by programming this module specifically to your vehicle’s Vehicle Identification Number (VIN). Before we ship, we flash the unit with the latest, most stable software updates directly from GM. This ensures perfect compatibility with your vehicle’s specific options and systems, eliminating the need for an expensive trip to the dealership for programming. Simply provide your VIN at checkout, and we handle the rest.
From the Diagnostic Bay
We had a 2011 CTS come into the shop with a complaint that was driving the owner crazy. The car would run perfectly for days, then suddenly start misfiring, and the transmission would shift erratically. The check engine light was intermittent, throwing a variety of seemingly unrelated codes—from O2 sensor faults to communication errors with the transmission module. We checked wiring, sensors, and grounds, but everything looked solid. Finally, we hooked up a scope to the ECM’s main communication lines. We saw the data stream was occasionally dropping out, indicating an internal failure in the module. After installing a VIN-programmed replacement ECM like this one, all the phantom codes vanished, and the car ran flawlessly. It’s a classic case of a failing computer causing widespread, confusing symptoms.
Common Symptoms of a Failing 2010-2012 CTS Engine Module
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs replacement:
- ✔ Check Engine Light is on with various, often inconsistent, trouble codes.
- ✔ Engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or unstable engine idle.
- ✔ Engine stalling or hesitating during acceleration.
- ✔ Automatic transmission shifting harshly or at the wrong times.
- ✔ Loss of communication with diagnostic scan tools.
- ✔ Misfire codes (e.g., P0300-P0306) that persist after replacing spark plugs and coils.
A Direct-Fit, Programmed Solution
This module is a direct replacement for several original equipment part numbers, including 12616889, 12630908, 12637106, 12642665, 12650256, and 12651993. It’s not just for the Cadillac CTS; this versatile ECM is also the correct component for a wide range of other GM vehicles, including the Buick LaCrosse, Chevrolet Camaro, GMC Terrain, and more. Please verify your part number and check the detailed fitment list to ensure compatibility. Our VIN-programming service guarantees that the module you receive is perfectly matched to your vehicle’s factory specifications, ensuring a seamless installation and restoration of function.
Installation is straightforward for a qualified technician or experienced DIYer. Once the new module is physically installed, a security relearn procedure (often called a Passlock or anti-theft relearn) is typically required. This procedure can usually be performed without special tools and involves a series of key cycles. Instructions for this are widely available and simple to follow. By having the module pre-programmed to your VIN, you bypass the most complex and costly part of the replacement process.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you can send us a message with your 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for the module to function in your vehicle.
Is any additional programming required after installation?
No dealership programming is needed. The module arrives flashed with your vehicle’s specific software. However, you will likely need to perform a security/anti-theft relearn procedure, which can typically be done in your driveway in about 30 minutes.
Is this a brand new part?
This is a high-quality, fully tested replacement part that has been serviced to meet or exceed original equipment standards. Each unit is inspected and programmed with the latest GM software for optimal performance and longevity.
How do I know if this ECM will fit my vehicle?
The best way to ensure compatibility is to match the part number from your original module to one of the numbers listed: 12616889, 12630908, 12637106, 12642665, 12650256, or 12651993. You can also check the detailed fitment list on this page.
What is your warranty policy on this module?
This part comes with a standard warranty that covers any defects in the module itself. Please refer to our store’s warranty page for complete details and duration.