Restore Your GM Vehicle’s Performance and Reliability
If you’re dealing with a frustrating check engine light, erratic engine behavior, or a no-start condition in your 2009 GMC Acadia or other compatible GM vehicle, a failing Engine Control Module (ECM) is often the culprit. As the brain of your engine, a faulty ECM can cause a cascade of problems, from poor fuel economy to stalling at the worst possible moments. I’ve seen it hundreds of times in the shop: a perfectly good engine held back by a failing computer. This isn’t just an inconvenience; it’s a reliability issue that needs a dependable solution.
This replacement Engine Control Module is your direct-fit, hassle-free answer. We take the guesswork and high costs out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN). This means it arrives at your door ready for installation, loaded with the latest factory software from GM. You get to skip the expensive trip to the dealership for programming, saving you both time and money. This is the same professional-grade solution I’d use for a customer’s vehicle in my own service bay.
From the Diagnostic Bay: A 2009 Acadia’s Ghost
A customer brought in a 2009 Acadia with an issue that was driving them crazy. The vehicle would run fine for days, then suddenly stall at a stoplight or hesitate badly during acceleration. They’d been to two other shops that couldn’t find the problem because it was so intermittent. When I connected my scanner, I found a stored history code: P0606 – ECM/PCM Processor Fault. This code is a dead giveaway. The internal processor of the ECM was failing intermittently under load. We installed one of these VIN-programmed modules, and the vehicle ran perfectly. The customer was thrilled to have their reliable family vehicle back without the dealership price tag.
Is Your Vehicle Showing These Telltale Signs?
A failing ECM can manifest in several ways. If you’re experiencing any of the following, this module is likely the solution you need. Look out for:
- âś” The Check Engine Light is on or flashing.
- âś” Stored diagnostic trouble codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM Processor Fault).
- âś” Unexplained engine stalling or rough idling.
- âś” The engine cranks but refuses to start.
- âś” A noticeable decrease in fuel efficiency.
- âś” Hesitation or stumbling during acceleration.
- âś” Failed emissions inspection.
A Straightforward Guide to Installation
Installing your new 2009 Acadia Engine Control Module is a manageable job for a confident DIYer. On the Acadia, Traverse, Enclave, and Outlook, the module is located behind the fan shroud, making access relatively direct. Always consult a vehicle-specific repair manual if you are unsure.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the ECM: Find the old module. On the GM SUVs, it’s typically mounted behind the radiator fan shroud. On the sedans (CTS, STS), it’s in the engine compartment on the right-hand (passenger) side.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and unplug them from the old ECM. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware that secures the ECM to its bracket or the vehicle body.
- Install the New Module: Mount your new, pre-programmed ECM in place and tighten the hardware.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: Some vehicles may require a security relearn or crankshaft position sensor relearn procedure, which can often be done without special tools. Check your owner’s manual or a reliable online resource for the specific procedure for your model.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12628387 and is also compatible with part numbers 12623325, 12605672, 12630594, and 19300016. It is guaranteed to fit the following vehicles:
- âś” 2009 GMC Acadia – Electronic Control Module; (behind fan shroud)
- âś” 2009 Chevrolet Traverse – Electronic Control Module; (behind fan shroud)
- âś” 2009 Saturn Outlook – Electronic Control Module; (behind fan shroud)
- âś” 2009 Buick Enclave – Electronic Control Module; (behind fan shroud)
- âś” 2008-2009 Cadillac CTS – Electronic Control Module; (RH front engine compartment), 3.6L, VIN V (8th digit)
- âś” 2008-2009 Cadillac STS – Electronic Control Module; (RH engine), 3.6L
Frequently Asked Questions
Do I need to do any programming after I receive this?
No. We program the module to your vehicle’s VIN before shipping. It arrives ready to be installed. In some cases, a simple, tool-free security relearn procedure may be necessary, which is outlined in many owner’s manuals.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot ship the module until we receive this information, as the programming is specific to your exact vehicle.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part that has been programmed with the latest GM software updates for optimal performance and longevity.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (like codes P0601 or P0606), then yes, this part will resolve the issue. It’s crucial to properly diagnose the problem before ordering to ensure the ECM is the true cause.
What if this doesn’t fix my problem?
We guarantee our programming and the functionality of the module itself. However, it’s essential to ensure the ECM is the correct diagnosis for your vehicle’s issue. We recommend consulting with a professional mechanic if you are uncertain. Please see our warranty and return policy for more details.