Restore Peak Performance to Your GM SUV or Sedan
As a technician with over two decades of experience under the hood, I’ve seen firsthand the frustration a failing Engine Control Module (ECM) can cause. Your 2009 GMC Acadia, or a similar GM vehicle, might be experiencing baffling issues: intermittent stalling, a persistent Check Engine Light, poor fuel economy, or even a complete no-start condition. These aren’t just annoyances; they’re signs that the very brain of your engine is in trouble. This replacement 2009 Acadia Engine Control Module is the reliable, straightforward solution you need to get your vehicle running smoothly again.
The ECM is the central command center, managing everything from fuel injection and ignition timing to emissions systems and communication with other modules. When it fails, the symptoms can be widespread and confusing. You don’t have to be a master mechanic to solve this problem. We take the biggest headache out of the equation: programming. Simply provide us with your vehicle’s VIN during checkout, and our experts will flash this module with the latest, most stable software updates directly from GM. It arrives at your door ready to install, saving you a costly trip to the dealership for programming.
A Technician’s Notebook
I remember a 2009 Buick Enclave (which shares the same platform as the Acadia) that came into the shop on a tow truck. The owner had already replaced the fuel pump and crank sensor, but it still wouldn’t start consistently. The scanner showed a slew of communication error codes (U-codes) and a P0606 (ECM Processor Fault). After verifying the power and ground circuits to the ECM were solid, it was clear the module itself had an internal failure. We installed a pre-programmed ECM just like this one, and the engine fired up on the first try and ran perfectly. This simple swap saved the customer from more guesswork and unnecessary parts expenses.
Is Your Vehicle Exhibiting These Telltale Signs?
A faulty ECM can manifest in many ways. If you’re noticing any of the following, it’s a strong indicator that your engine’s computer needs attention:
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or other communication faults (U-codes).
- ✔ The engine cranks but refuses to start.
- ✔ Intermittent stalling or rough idling for no apparent reason.
- ✔ A noticeable drop in fuel efficiency.
- ✔ The transmission seems to shift erratically or harshly.
- ✔ The cooling fans run constantly, even when the engine is cold.
A Straightforward Guide to Installation
Replacing the 2009 Acadia Engine Control Module is a manageable job for a confident DIYer. On most of these GM SUVs, the ECM is located behind the fan shroud, accessible from the top of the engine bay. Always consult a vehicle-specific repair manual, but here are the general steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all modules to power down completely.
- Locate the Module: Find the ECM. On the Acadia, Traverse, Enclave, and Outlook, it’s typically mounted to the radiator fan shroud assembly.
- Disconnect Connectors: Carefully release the locking tabs and unplug the large electrical connectors from the old ECM. Inspect the connectors for any corrosion or damage.
- Remove the Old ECM: Unbolt the old module from its mounting bracket. There are usually a few small bolts holding it in place.
- Install the New ECM: Mount your new, pre-programmed module in the same location, securing it with the original bolts.
- Reconnect Everything: Plug the electrical connectors firmly into the new ECM until they click into place. Reconnect the negative battery terminal.
- Final Step: Some vehicles may require a security relearn procedure, which can often be done without special tools by cycling the key. Check your owner’s manual for this simple process. Start the vehicle and check for proper operation.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12623325, 12628387, 12605672, 12630594, and 19300016. It is guaranteed to fit the following vehicles:
- 2009 GMC Acadia (Located behind fan shroud)
- 2009 Chevrolet Traverse (Located behind fan shroud)
- 2009 Buick Enclave (Located behind fan shroud)
- 2009 Saturn Outlook (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)
Frequently Asked Questions
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to access the exact GM software and calibrations specific to your vehicle’s engine, transmission, and options. This ensures the 2009 Acadia Engine Control Module works perfectly right out of the box.
Is this part truly plug-and-play?
Yes, for over 99% of vehicles. Because we program it to your VIN, it eliminates the need for dealer-level programming tools. In some rare cases, a simple key-cycle security relearn may be needed, which is outlined in your owner’s manual.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (e.g., codes P0601-P0606), then this part is the correct fix. It’s always best to have the codes professionally diagnosed to ensure the ECM is the root cause before ordering.
Where is the ECM located on my 2009 Acadia?
On the 2009 GMC Acadia and its sister vehicles (Traverse, Enclave, Outlook), the Engine Control Module is typically mounted directly to the radiator fan shroud assembly in the engine bay.
Do I need to send my old part back?
No core charge is required for this part. You do not need to return your old, faulty module to us.