Is Your 2009 Traverse Running Rough? The ECM Might Be the Culprit.
If you’re experiencing frustrating and unpredictable issues with your 2009 Chevrolet Traverse, GMC Acadia, Buick Enclave, or other compatible GM vehicle, a failing Engine Control Module (ECM) is a very likely cause. The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions controls. When it begins to fail, it can create 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 12628387, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency. We take the guesswork out of the repair by pre-programming the module specifically to your vehicle’s Vehicle Identification Number (VIN). This means it arrives at your door ready for a straightforward installation, loaded with the latest factory software updates from GM to ensure optimal operation.
From the Diagnostic Bay
We had a 2009 Acadia come in with a complaint of intermittent stalling and a check engine light that would come and go. The owner had already replaced the throttle body and two oxygen sensors based on the codes, but the problem persisted. After hooking up our diagnostic scanner and monitoring live data, we noticed erratic readings from multiple sensors that didn’t make sense together. This is a classic sign of a failing computer. Instead of chasing phantom sensor issues, we identified the root cause: the ECM itself was failing and sending corrupt data. We installed a VIN-programmed 2009 Traverse ECM (the same unit as the Acadia’s), and the vehicle ran perfectly. The customer was relieved to finally have a real solution after weeks of frustration.
Symptoms of a Failing 2009 Traverse ECM
A faulty engine computer can manifest in numerous ways. If you’re noticing any of the following issues, it’s time to consider replacing your ECM:
- ✔ Check Engine Light is on with various, often unrelated, trouble codes (P-codes).
- ✔ Vehicle experiences random stalling or difficulty starting.
- ✔ Noticeable decrease in fuel economy (MPG).
- ✔ Rough or erratic engine idling.
- ✔ Hesitation or stumbling during acceleration.
- ✔ Transmission shifting issues, such as harsh shifts or getting stuck in gear.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Misfire codes that persist even after replacing spark plugs and ignition coils.
The Importance of VIN Programming
You can’t simply take an ECM from another vehicle and plug it into yours. Modern vehicles use sophisticated anti-theft systems (like GM’s Passlock/Passkey) and have specific calibrations for the engine, transmission, and emissions equipment. Our professional programming service ensures this module is a perfect match for your vehicle’s factory settings. By providing us with your VIN during checkout, we will:
- ✔ Flash the module with the correct software for your exact model, year, and options.
- ✔ Install the latest GM-released updates, which can solve factory bugs and improve performance.
- ✔ Calibrate the module to communicate seamlessly with your vehicle’s other computers.
This process eliminates the need for an expensive trip to the dealership for programming, saving you hundreds of dollars and significant downtime. The module arrives ready for installation, and in most cases, will not require any additional procedures.
Guaranteed Fitment and Compatibility
This ECM is a direct replacement for a wide range of GM vehicles equipped with the 3.6L V6 engine. It is compatible with multiple original part numbers, ensuring a perfect match. Please verify your vehicle is listed below.
Compatible Part Numbers: 12623325, 12628387, 12605672, 12630594, 19300016
This part will fit these makes and models with these options:
- Cadillac CTS (2008-2009): Electronic Control Module; (RH front engine compartment), 3.6L, VIN V (8th digit)
- Cadillac STS (2008-2009): Electronic Control Module; (RH engine), 3.6L
- GMC Acadia (2009): Electronic Control Module; (behind fan shroud)
- Chevrolet Traverse (2009): Electronic Control Module; (behind fan shroud)
- Saturn Outlook (2009): Electronic Control Module; (behind fan shroud)
- Buick Enclave (2009): Electronic Control Module; (behind fan shroud)
Frequently Asked Questions
How do I provide my VIN?
After you complete your purchase, you will receive an email with instructions. You can also add your VIN to the ‘notes’ section during checkout. We cannot ship your part until we receive your VIN.
Is this part difficult to install?
The physical installation is straightforward for someone with basic mechanical skills. It typically involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. Since our module comes pre-programmed, no special tools are needed for software setup.
Will I need to perform a security relearn procedure?
In most cases, no additional procedures are required. Our programming handles the security information. However, on rare occasions, a simple key cycle relearn may be necessary, which can be done without any special tools. Instructions can be provided if needed.
What if my original part number is not on your list but my vehicle is?
The part numbers listed are the most common, but GM often uses superseded numbers. As long as your vehicle’s year, make, model, and engine match the fitment list, this module will be the correct one once programmed to your VIN.
Is there a warranty on this part?
Yes, all our programmed modules come with a standard warranty against defects. Please see our warranty page for complete details and coverage information.