Restore Your Vehicle’s Brainpower: The Core of Your Engine’s Performance
The Engine Control Module (ECM), often called the engine’s computer, is the master controller for your 2009 Buick Enclave, GMC Acadia, or other compatible GM vehicle. It meticulously manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When this critical component begins to fail, it can cause a cascade of confusing and frustrating problems, leaving your vehicle unreliable and performing poorly. This replacement Engine Control Module, part number 12630594, is the definitive solution to restore your vehicle’s factory performance and dependability.
Unlike a generic part off the shelf, this module is a complete, ready-to-install solution. The most critical step—programming—is handled by our experts before it ever leaves our facility. Using the specific Vehicle Identification Number (VIN) you provide, we flash the module with the latest, most stable software updates directly from General Motors. This ensures that the ECM is perfectly matched to your vehicle’s specific configuration, options, and security system, eliminating the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
We had a 2009 GMC Acadia come in with a truly frustrating issue. The owner complained of random stalling, but only after driving for 20-30 minutes. The check engine light would come on with a P0606 (ECM Processor Fault) code, but then go off on its own. We checked wiring, grounds, and power feeds—all were perfect. The problem was heat-soak related. As the engine bay warmed up, a hairline fracture on the ECM’s circuit board would expand, causing an internal short. After it cooled, it would work fine again. Installing a pre-programmed replacement ECM like this one solved the problem permanently. The customer was thrilled to have their reliable family vehicle back without the constant worry of stalling in traffic.
Is Your ECM Failing? Common Symptoms to Watch For
A failing engine computer can manifest in various ways. If you’re experiencing any of the following, a faulty ECM could be the culprit:
- ✔ Check Engine Light: An illuminated or flashing Check Engine Light, often with communication-related or internal processor fault codes (e.g., P0601, P0606).
- ✔ Engine Stalling: The engine may stall unexpectedly while driving or at an idle, and may be difficult to restart.
- ✔ No-Start Condition: The engine cranks but refuses to start due to a lack of spark or fuel injector pulse commanded by the ECM.
- ✔ Poor Performance & Fuel Economy: Noticeable loss of power, hesitation during acceleration, and a sudden drop in miles per gallon (MPG).
- ✔ Erratic Transmission Shifting: The ECM works with the Transmission Control Module (TCM) to ensure smooth shifts. A faulty ECM can cause harsh or delayed shifting.
- ✔ Intermittent Issues: Problems that seem to appear and disappear randomly, often related to temperature changes.
The Premier Solution for Your 2009 Enclave Engine Control Module
Choosing the right replacement part is crucial. Our process ensures you receive a reliable and perfectly matched component. When you order this 2009 Enclave Engine Control Module, you’re not just getting a part; you’re getting a comprehensive service. We take your VIN, access the official GM database, and load the precise software your vehicle was built with, including any subsequent updates for improved performance and reliability. This makes the installation process as straightforward as possible.
This module is a direct replacement for a range of original part numbers, ensuring wide compatibility. It is guaranteed to work with the following part numbers: 12623325, 12628387, 12605672, 12630594, and 19300016. It fits a variety of popular GM models from 2008 and 2009 equipped with the 3.6L V6 engine, including:
- 2009 Buick Enclave
- 2009 GMC Acadia
- 2009 Chevrolet Traverse
- 2009 Saturn Outlook
- 2008-2009 Cadillac CTS (3.6L, VIN V)
- 2008-2009 Cadillac STS (3.6L)
Installation is typically straightforward for a seasoned DIYer or any professional technician. On the GM Lambda platform SUVs (Enclave, Acadia, Traverse, Outlook), the ECM is located behind the fan shroud in the engine compartment. On the sedans (CTS, STS), it’s found in the right-hand (passenger side) engine area. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. While the core programming is done, some vehicles may benefit from a simple throttle relearn or CASE relearn procedure with a capable scan tool to achieve optimal idle and performance immediately.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the module correctly. It allows us to load the exact GM software for your vehicle’s engine, transmission, emissions system, and security (immobilizer) settings. This ensures a true plug-and-play installation.
Is any additional programming required after I install it?
No, the critical programming is completed by us before shipment. In some cases, a secondary procedure like a Crankshaft Variation (CASE) relearn may be needed using a scan tool to clear a related trouble code, but the vehicle will start and run without it.
Where is the ECM located on my 2009 Buick Enclave?
On the 2009 Enclave, Acadia, Traverse, and Outlook, the ECM is located in the engine bay, mounted behind the engine’s cooling fan shroud.
Will this fix my check engine light?
If your check engine light is on due to an internal failure of the ECM (codes like P0601-P0606), then this part will solve the issue. It’s always best to have your vehicle professionally diagnosed to confirm the ECM is the point of failure before ordering.
Is this part compatible with part number 12628387?
Yes. This module is a direct, compatible replacement for all listed part numbers, including 12623325, 12628387, 12605672, 12630594, and 19300016.