Is Your Cadillac CTS Running Rough or Not Starting?
If your 2010, 2011, or 2012 Cadillac CTS is experiencing frustrating issues like a persistent check engine light, poor fuel economy, erratic engine behavior, or a complete no-start condition, a failing Engine Control Module (ECM) is a very likely culprit. The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting. When it fails, it can cause a cascade of problems that leave your car unreliable and unsafe to drive. Don’t let a faulty computer keep you off the road. This direct-fit, VIN-programmed Engine Control Module is the definitive solution to restore your vehicle’s performance and reliability.
Expert Pro Tip
Before replacing your ECM, always perform a thorough check of the vehicle’s battery, charging system, and all main power and ground connections to the module. A weak battery or a corroded ground wire can mimic ECM failure symptoms and lead to a costly misdiagnosis. A simple voltage drop test on the main ground circuits can save you hundreds of dollars and significant time.
The Simple Solution: A VIN-Programmed 2010-2012 CTS Engine Module
Replacing an ECM used to mean a costly trip to the dealership for the part, installation, and mandatory programming. We’ve streamlined this process to save you time and money. When you order this module from us, we handle the complex part for you. Simply provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number) during or after checkout. Our technicians will then flash the module with the latest, most stable GM-approved software specific to your exact vehicle configuration. This ensures that when the part arrives, it’s ready for a straightforward installation, eliminating the need for expensive scan tools or dealership intervention.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on with various communication or processor-related codes.
- ✔ Engine cranks but refuses to start.
- ✔ Noticeable drop in fuel efficiency.
- ✔ Engine stalling, stuttering, or misfiring unexpectedly.
- ✔ Automatic transmission shifting erratically or harshly.
- ✔ Loss of power and poor acceleration.
- ✔ Communication issues with diagnostic scan tools.
Guaranteed Fitment and Wide Compatibility
This module, identified by part number 12642665, is not only the correct computer for your 2010-2012 Cadillac CTS with the 3.0L or 3.6L engine, but it also serves as a direct replacement for a wide range of other General Motors vehicles. It is interchangeable with part numbers 12616889, 12630908, 12637106, 12650256, and 12651993. This broad compatibility means it’s the right choice for models like the Chevrolet Camaro, Impala, Equinox, Captiva Sport, Orlando, Buick Allure, LaCrosse, Regal, GMC Terrain, and more. By ordering this single part, you are getting a versatile and reliable component that meets OEM specifications across numerous popular platforms.
Installation Process
Once you receive your pre-programmed 2010-2012 CTS Engine Module, the physical installation is typically simple. Locate the old module (in the CTS, it’s in the right-hand front of the engine compartment), disconnect the negative battery terminal, unplug the wiring harnesses, and unbolt the module. Install the new module in the reverse order. After installation, you may need to perform a simple security relearn procedure (often called a VATS relearn) to sync the new ECM with your vehicle’s anti-theft system. This procedure can usually be done without any special tools and involves a sequence of key cycles. Instructions are widely available online or in your vehicle’s service manual.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. The main benefit of our service is that we program the module to your specific vehicle’s VIN before we ship it to you. It arrives ready to be installed, saving you the time, hassle, and expense of a dealership visit.
Where can I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side dashboard visible through the windshield. It is also typically located on the driver’s side door jamb sticker.
What is a security relearn procedure?
A security relearn, or VATS relearn, is a simple procedure that allows your vehicle’s anti-theft system to recognize the new ECM. It usually involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating the cycle three times. This allows the components to sync and authorize the vehicle to start.
How can I be certain my old ECM is the problem?
While the symptoms listed above are strong indicators, a definitive diagnosis is always recommended. A professional mechanic can test the power, ground, and communication circuits at the ECM to rule out wiring issues before you replace the module itself.
Does this part fit vehicles other than the Cadillac CTS?
Yes, absolutely. This ECM is compatible with a wide array of GM vehicles, including the Chevy Camaro, Impala, Equinox, Captiva Sport, Buick LaCrosse, GMC Terrain, and Saab 9-5, among others. It directly replaces multiple part numbers for broad application.
Which part numbers does this unit replace?
This module is a direct replacement for part numbers 12616889, 12630908, 12637106, 12642665, 12650256, and 12651993, ensuring perfect compatibility if your original module carries any of these numbers.