Restore Peak Performance to Your GM 3.6L Vehicle
Is your 2009 Buick Enclave, GMC Acadia, or Cadillac CTS running rough, stalling, or displaying a persistent Check Engine Light? The Engine Control Module (ECM), the central computer of your vehicle, is often the culprit behind these frustrating and complex issues. This replacement ECM, part number 12605672, is the definitive solution to restore your vehicle’s factory performance, fuel efficiency, and reliability. We take the guesswork out of the repair by pre-programming the module specifically for your vehicle using your VIN, ensuring a seamless, plug-and-play installation.
Diagnosing a Faulty 2009 Enclave Engine Module
A failing ECM can manifest in numerous ways, often mimicking other sensor or component failures, which can lead to expensive and incorrect repairs. If you’re experiencing a combination of the symptoms below, it’s a strong indicator that your 2009 Enclave Engine Module may need replacement. A faulty module can disrupt everything from fuel injection timing and spark delivery to transmission shifting and emissions control, causing a cascade of problems that can leave your vehicle unreliable or even undrivable.
From the Diagnostic Bay
We once had a 2009 GMC Acadia in the shop with a ghost of a problem. The owner complained of intermittent stalling at stoplights and a random hesitation during acceleration. No specific trouble codes were stored, just a generic P0300 random misfire code that would pop up occasionally. We checked plugs, coils, and fuel pressure—all were perfect. After hours of chasing wires, we finally connected a scope to the injector control signals from the ECM. We saw the signal drop out for a millisecond, just long enough to cause a stumble but not long enough to set a specific code. It was a classic case of a failing processor on the ECM board. We installed a VIN-programmed module just like this one, and the Acadia ran like it just rolled off the assembly line. This simple swap saved the customer from potentially replacing the entire fuel system based on guesswork.
Common Symptoms of ECM Failure
- ✔ Check Engine Light is on with various, often inconsistent, trouble codes.
- ✔ Vehicle experiences intermittent stalling or fails to start at all.
- ✔ Noticeable decrease in fuel economy and overall engine performance.
- ✔ Rough idling, engine misfires, or hesitation during acceleration.
- ✔ Automatic transmission shifts erratically or harshly.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Issues with other electronic systems, as the ECM communicates with multiple modules.
The Importance of VIN Programming
Modern vehicles are complex, and the ECM is tailored to the specific options and systems your car was built with. Simply installing a used module from another vehicle will not work and can cause significant operational problems. Our process eliminates this hurdle. When you provide your Vehicle Identification Number (VIN) during checkout, our technicians flash the module with the latest GM-certified software specific to your vehicle. This ensures all parameters for the engine, transmission, anti-theft system (Passlock/VATS), and emissions controls are correctly configured. This makes the installation process as simple as possible, often requiring no additional dealer visits for programming.
Guaranteed Fitment and Compatibility
This module is a direct replacement for a range of GM vehicles equipped with the 3.6L engine. Please verify your part number or consult the fitment list below. This unit is compatible with the following part numbers:
- 12623325
- 12628387
- 12605672
- 12630594
- 19300016
This 2009 Enclave Engine Module is also confirmed to fit the following vehicles:
- 2009 Buick Enclave (located behind fan shroud)
- 2009 GMC Acadia (located behind fan shroud)
- 2009 Saturn Outlook (located behind fan shroud)
- 2009 Chevrolet Traverse (located behind fan shroud)
- 2008-2009 Cadillac CTS (3.6L, VIN V – 8th digit, RH front engine compartment)
- 2008-2009 Cadillac STS (3.6L, RH engine)
Don’t let a faulty ECM keep you off the road. Order this professionally programmed engine control module today and restore the brain of your vehicle with confidence.
Frequently Asked Questions
Do I need to send you my old ECM?
No, there is no core charge or need to send us your old part. This is an outright purchase. We program a replacement module and ship it directly to you.
What information do you need to program the module?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). This is critical for us to load the correct software and ensure compatibility.
Is any additional programming required after installation?
In most cases, this module is a plug-and-play solution. However, some vehicles may require a security relearn procedure (often called a Passlock or VATS relearn) to sync the new ECM with the vehicle’s anti-theft system. This is a simple procedure that can typically be done without special tools and instructions can be readily found online for your specific model.
How do I find my current ECM part number?
The part number is printed on a sticker on the case of your existing Engine Control Module. You can compare it to the list of compatible part numbers in this description to confirm fitment before ordering.
Will this fix my specific problem?
While this 2009 Enclave Engine Module is the correct solution for a failed ECM, it’s essential to have your vehicle properly diagnosed. This part will not fix issues caused by faulty sensors, wiring, or mechanical problems. Please ensure a qualified mechanic has diagnosed the ECM as the point of failure.