Restore Peak Performance to Your Cadillac with a VIN-Programmed ECM
Is your 2010-2012 Cadillac CTS running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your vehicle’s performance, fuel economy, and emissions. Don’t let a faulty ECM keep you sidelined. This direct-replacement ECM, part number 12650256, is the reliable, straightforward solution you need to get your vehicle running like new again.
As a technician with over two decades of experience, I’ve seen firsthand how a failing ECM can cause a cascade of confusing problems that are difficult to diagnose. This isn’t just a part; it’s the brain of your engine. That’s why we take the critical step of programming this module specifically to your vehicle’s VIN before it ships. This ensures seamless communication with your car’s other systems, like the transmission controller and anti-theft system, eliminating the need for an expensive trip to the dealership for programming.
Case Study: A Tricky Diagnosis
A customer brought in a 2011 CTS with a frustrating intermittent no-start condition. The battery was good, the starter was fine, but sometimes it would just crank and never fire up. No consistent trouble codes were stored, making it a real head-scratcher. After checking fuel pressure and spark, which were also intermittent, my attention turned to the ECM. By monitoring the live data stream, I noticed the injector pulse and ignition coil commands would randomly drop out. This pointed directly to an internal failure in the 2010-2012 CTS Engine Control Module. We installed one of our pre-programmed units, and the car fired up instantly and has run flawlessly ever since. It saved the customer from chasing down phantom issues and a massive dealership bill.
Common Signs of a Failing ECM
If you’re experiencing any of the following, a faulty engine computer could be the culprit. A failing module can often trigger diagnostic trouble codes (DTCs) like P0601, P0606, or U0100.
- ✔ Check Engine Light is on or flashing
- ✔ Engine stalling or misfiring
- ✔ Vehicle won’t start or has trouble starting
- ✔ Noticeable decrease in fuel efficiency
- ✔ Poor engine performance or hesitation
- ✔ Transmission shifting issues
- ✔ Communication errors with other modules
A Straightforward Guide to Installation
Replacing the ECM on your Cadillac is a manageable job for a confident DIYer. Our pre-programming service handles the most complex part of the process. Always consult a vehicle-specific repair manual for detailed instructions.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the ECM: On the 2010-2012 CTS, the Engine Control Module is typically found in the right-hand (passenger side) front of the engine compartment.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old ECM. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. There are usually a few bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed 2010-2012 CTS Engine Control Module in place and tighten the mounting bolts securely.
- Reconnect Everything: Plug the wiring harnesses back into the new ECM, ensuring they click securely into place. Reconnect the negative battery terminal.
- Final Steps: Some vehicles may require a security or crankshaft position sensor relearn procedure after installation, which can often be done without special tools. Check your service manual for specifics. Start the vehicle and check for proper operation.
Verified Vehicle Compatibility
This ECM is a direct replacement for multiple part numbers, including 12616889, 12630908, 12637106, 12642665, 12650256, and 12651993. It is confirmed to fit the following vehicles. Please match your part number or contact us with your VIN to ensure perfect fitment.
- ✔ Cadillac CTS: 2010-2012 (3.0L, 3.6L)
- ✔ Cadillac SRX: 2010-2011 (3.0L)
- ✔ Buick Allure / LaCrosse: 2010-2011 (2.4L, 3.0L)
- ✔ Buick Regal: 2011
- ✔ Chevrolet Camaro: 2012 (3.6L)
- ✔ Chevrolet Captiva Sport: 2012
- ✔ Chevrolet Equinox: 2010-2011
- ✔ Chevrolet Impala: 2012
- ✔ Chevrolet Orlando: 2012-2013
- ✔ GMC Terrain: 2010-2011
- ✔ Saab 9-5: 2010-2011 (2.0L)
Frequently Asked Questions
How do I provide my VIN for programming?
After completing your purchase, please send us a message with your vehicle’s 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 car.
Is any additional programming needed after installation?
In most cases, no. Our service programs the module with the latest GM software matched to your VIN, making it a plug-and-play installation. However, some vehicles may require a simple, key-on/key-off security relearn or a crankshaft variation relearn, which can typically be done without a scan tool.
Will this fix my specific problem?
This 2010-2012 CTS Engine Control Module is a direct solution for failures within the computer itself. While it resolves the most common electronic engine issues, we always recommend a proper diagnosis to confirm the ECM is the root cause of your vehicle’s symptoms before ordering.
Is this a used part?
This is a high-quality, tested, and verified recycled OEM part. Each unit is inspected and then programmed with certified GM software to ensure it meets or exceeds original factory performance standards, providing a reliable and cost-effective solution.
What is the warranty on this part?
This part comes with our standard warranty, guaranteeing it to be free from defects upon arrival and during the warranty period. Please see our store’s warranty page for complete details and duration.