Is Your GM 3.6L Vehicle Running Rough?
If you’re experiencing frustrating issues like stalling, erratic engine behavior, a persistent check engine light, or a complete no-start condition in your 2009 GMC Acadia, Cadillac CTS, or other compatible GM vehicle, 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 and emissions control. When it fails, it can cause a cascade of problems that are often difficult to diagnose, leading to wasted time and money on unnecessary repairs.
This replacement Engine Control Module, part number 12605672, is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork out of the repair process. Before this module ships, we will program it specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures that it arrives with the latest GM factory software updates, ready for a straightforward installation process. You get a component that is perfectly matched to your vehicle’s specific configuration, eliminating compatibility issues and the need for expensive dealership programming.
From the Diagnostic Bay
We recently had a 2009 Buick Enclave (which uses the same platform as the Acadia) come into the shop with a random misfire on cylinder 3 that just wouldn’t go away. The owner had already replaced the spark plug, ignition coil, and even the fuel injector for that cylinder, but the P0303 code kept returning. After hooking up our diagnostic scope, we noticed the control signal from the ECM to the coil was weak and inconsistent. The internal driver for that coil inside the original ECM had failed. We installed one of our pre-programmed modules, performed the security relearn, and the engine ran perfectly smooth. It’s a classic case where the problem isn’t the component being controlled, but the controller itself.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on with various communication or performance codes.
- ✔ Engine cranks but refuses to start.
- ✔ Stalling, hesitation, or stumbling during acceleration.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Misfire codes that persist after replacing coils and plugs.
- ✔ Intermittent loss of power or throttle response.
Why Choose Our 2009 Acadia Engine Module?
Choosing the right replacement part is critical. Our process is designed for both professional technicians and savvy DIYers. By providing us with your VIN at checkout, you ensure that the 2009 Acadia Engine Module you receive is loaded with the correct, updated software for your exact vehicle. This service is included with your purchase and is essential for proper function. This module is a direct replacement for several part numbers, including 12623325, 12628387, 12605672, 12630594, and 19300016, offering broad compatibility across the GM 3.6L platform.
Installation is simplified thanks to our pre-programming service. For most of the listed vehicles, the ECM is located behind the fan shroud, making it accessible. After physical installation, you will typically need to perform a security relearn procedure (often called a Passlock or anti-theft relearn), which can usually be done without special tools. This procedure syncs the new ECM with your vehicle’s existing anti-theft system. Instructions for this are widely available and generally involve a series of key cycles.
Don’t let a faulty computer keep your vehicle off the road. This is your opportunity to get a reliable, correctly configured 2009 Acadia Engine Module and restore your vehicle’s brain to perfect working order.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. You can typically reply to your order confirmation email or use a contact form on our site. We cannot ship the module until we receive and validate your VIN.
Is this a plug-and-play part?
Because we program it to your VIN, it is as close to plug-and-play as possible. However, you will still need to perform a security relearn procedure after installation to sync the module with your vehicle’s anti-theft system. This typically does not require a scan tool.
Will this fix my specific problem?
This module will correct issues directly caused by a faulty ECM. While the symptoms listed are common indicators of ECM failure, we always recommend a proper diagnosis by a qualified technician to confirm the ECM is the root cause of your problem before ordering.
Does this module fit vehicles other than the 2009 Acadia?
Yes. This ECM is compatible with a range of GM models from 2008-2009 equipped with the 3.6L engine, including the Cadillac CTS, Cadillac STS, Buick Enclave, Saturn Outlook, and Chevrolet Traverse. Please check the detailed fitment list on this page to confirm compatibility.
What if I have a different part number on my original module?
This module is a direct replacement for several original equipment part numbers, including 12623325, 12628387, 12630594, and 19300016. As long as your original part number is on this list, this module will function correctly once programmed to your VIN.