Restore Your Cadillac’s Performance and Reliability
Is your 2010-2012 Cadillac CTS experiencing baffling electrical issues, poor engine performance, or a persistent Check Engine light? The Engine Control Module (ECM), the central computer of your vehicle, is often the culprit. When it fails, it can cause a cascade of problems that are frustrating to diagnose and can leave you stranded. I’ve seen it countless times in my 20+ years on the job: intermittent stalling, no-start conditions, and erratic transmission shifting all pointing back to a faulty ECM. This isn’t just an inconvenience; it’s a critical component for your vehicle’s safety and operation.
This direct-fit replacement ECM, part number 12637106, is the definitive solution. We take the guesswork and high dealership costs out of the equation. Before we ship, our technicians will program the module with the latest official GM software, specifically matched to your vehicle’s VIN. This ensures seamless communication between all your vehicle’s systems, from the engine and transmission to the fuel and ignition. You receive a part that is ready for installation, restoring the precise control and efficiency your GM vehicle was designed to have.
From the Diagnostic Bay: The Ghost in the Machine
A customer brought in a 2012 Cadillac CTS with a 3.6L engine. The complaint was confusing: random stalling at red lights, occasional harsh shifts, and a check engine light that would come and go. They had already replaced two oxygen sensors and a camshaft position sensor at another shop with no luck. The scan tool showed a mix of communication codes (U-codes) and a generic processor fault (P0606). This combination is a huge red flag for an internal ECM problem. Instead of chasing ghosts by replacing more sensors, we focused on the brain. After confirming power and ground to the ECM were solid, we installed one of our pre-programmed modules. The difference was immediate. The car started and idled perfectly, all fault codes cleared, and the transmission shifted like new. It’s a classic case where a failing 2010-2012 CTS Engine Control Module was mimicking other component failures, costing the owner time and money.
Common Signs of a Failing ECM
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ Engine cranks but refuses to start, or starts intermittently.
- ✔ Noticeable decrease in fuel economy for no apparent reason.
- ✔ Rough idling, engine stumbling, or stalling.
- ✔ Automatic transmission shifts harshly, erratically, or at the wrong times.
- ✔ Communication errors with other modules (U-codes).
- ✔ Apparent failure of multiple unrelated sensors at the same time.
A Straightforward Guide to Installation
Installing your new 2010-2012 CTS Engine Control Module is a manageable job for a confident DIYer or any professional mechanic. Since we program it beforehand, you avoid a trip to the dealer for expensive flashing services.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow capacitors to discharge.
- Locate the ECM: On the 2010-2012 Cadillac CTS, the ECM is typically found in the right-hand (passenger side) front of the engine compartment. For other compatible models, it may be on the driver’s side or on the air cleaner bracket.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and gently pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or bent pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the mounting hardware as you will need it for the new module.
- Install the New Module: Mount the new ECM securely onto the bracket and reconnect the electrical harnesses. Ensure they click firmly into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Relearn Procedure (If Required): In some cases, a security or crank variation relearn procedure may be necessary. This can often be done with a capable bi-directional scan tool or by following a specific vehicle procedure. Start the vehicle and check for proper operation and ensure the check engine light is off.
Verified Vehicle Compatibility
This ECM is a direct replacement for part number 12637106 and is also compatible with part numbers 12616889, 12630908, 12642665, 12650256, and 12651993. It fits a wide range of GM vehicles. Please match your part number or confirm fitment with your vehicle’s year, make, model, and engine size. Key applications include:
- 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)
Don’t let a faulty computer keep your car off the road. Ordering a pre-programmed 2010-2012 CTS Engine Control Module is the smartest, most efficient way to solve complex engine management problems and restore your vehicle to its factory-fresh performance.
Do I need to do anything after I purchase?
Do I need to do anything after I purchase?
Yes. After you complete your purchase, you MUST provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it. This ensures the software is a perfect match for your car’s specific options.
Is this a plug-and-play part?
Because we program it to your VIN before shipping, it is virtually plug-and-play. In some GM vehicles, a security relearn or crankshaft position sensor variation relearn may be required after installation. This is a standard procedure and can be performed with most professional-grade scan tools.
Will this fix my specific problem?
This module corrects issues directly caused by a failing ECM, such as internal processor faults (P0601, P0606), and the related symptoms of stalling, no-start, and poor performance. However, it’s crucial to ensure your vehicle’s problem has been properly diagnosed. This part will not fix issues caused by bad sensors, wiring, or mechanical failures.
How do I find my original part number?
The part number is printed on a sticker directly on your vehicle’s original ECM. You will need to locate the module in the engine bay to read it. Matching the part number is the best way to guarantee compatibility.
What if I order the wrong part?
We strongly encourage you to verify fitment before ordering. Providing your VIN for programming helps us catch potential compatibility issues. Please contact our expert support team with your vehicle information if you have any doubts before making a purchase.