Restore Peak Performance to Your GM Vehicle
Is your 2009 Buick Enclave, GMC Acadia, or Cadillac suffering from frustrating and unpredictable issues? Problems like intermittent stalling, a persistent check engine light, poor fuel mileage, or a complete no-start condition can often be traced back to a failing Engine Control Module (ECM). As a technician with over 20 years of experience, I’ve seen firsthand how a faulty ECM—the central computer of your engine—can create a diagnostic nightmare. This isn’t just a part; it’s the brain of your vehicle, and when it’s not working correctly, nothing else will.
This replacement 2009 Enclave Engine Module is the definitive solution to get your vehicle running smoothly and reliably again. We take the biggest headache out of the repair process: programming. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) during checkout, and our specialists will program the module with the latest, most stable software updates directly from GM. This ensures perfect communication between the ECM and all other systems in your vehicle, restoring factory-specified performance and efficiency.
Case Study: A Tricky Diagnosis
I remember a 2009 GMC Acadia that came into the shop with a complaint that stumped two other mechanics. The owner reported random stalling at stoplights and a transmission that felt like it was shifting harshly, but there were no consistent trouble codes—just a few random communication errors (U-codes) that would come and go. We checked grounds, wiring harnesses, and sensors for hours. Finally, on a hunch, we monitored the ECM’s internal voltage regulator on a scope and saw it dropping out intermittently. The ECM was slowly failing internally. We replaced it with a pre-programmed unit just like this one, and the vehicle ran perfectly. The customer was thrilled to have their reliable family vehicle back without the massive dealership bill.
Common Symptoms of a Failing ECM
If you’re experiencing any of the following, a faulty engine computer could be the culprit. A failing module can store a variety of Diagnostic Trouble Codes (DTCs), so a proper scan is always the first step.
- ✔ Check Engine Light is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ Engine misfires, runs rough, or stalls unexpectedly.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeable decrease in fuel economy.
- ✔ Transmission shifting issues or harsh engagement.
- ✔ Communication errors with other modules on the vehicle (U-codes).
- ✔ Problems with the anti-theft system or vehicle security light.
A Straightforward Guide to Installation
Replacing the ECM on these GM vehicles is a manageable job for a confident DIYer. With our pre-programmed module, you skip the most difficult step. Always consult a repair manual specific to your vehicle, but here are the general steps.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the ECM: On the Enclave, Acadia, Traverse, and Outlook, the ECM is typically located behind the cooling fan shroud. On the Cadillac CTS and STS, it’s usually on the right-hand (passenger) side of the engine compartment.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses and gently pull them straight out from the module. Never force them. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware, as you will need it to install the new unit.
- Install the New Module: Mount your new, pre-programmed ECM securely onto the bracket and reconnect the wiring harnesses. Ensure they click firmly into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a Vehicle Anti-Theft System (VATS) relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this sequence three times. This allows the new ECM to sync with your vehicle’s security system.
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 Buick Enclave (Electronic Control Module; behind fan shroud)
- 2009 GMC Acadia (Electronic Control Module; behind fan shroud)
- 2009 Chevrolet Traverse (Electronic Control Module; behind fan shroud)
- 2009 Saturn Outlook (Electronic Control Module; behind fan shroud)
- 2008-2009 Cadillac CTS (Electronic Control Module; RH front engine compartment, 3.6L, VIN V)
- 2008-2009 Cadillac STS (Electronic Control Module; RH engine, 3.6L)
Frequently Asked Questions
Why do you need my VIN?
Your VIN is crucial because it allows us to program the Engine Control Module with the exact software and calibrations specific to your vehicle’s options and features. This ensures seamless integration and proper function, just like a part from the dealership, but without the high cost and hassle.
Is this a simple plug-and-play installation?
Almost. Because we pre-program the module to your VIN, you do not need any special scan tools for software flashing. However, after installation, you will need to perform a standard security relearn procedure. This is a simple process that syncs the new module to your vehicle’s anti-theft system and typically takes about 30 minutes to complete using only your ignition key.
Will this fix my check engine light?
This module will resolve issues directly caused by an internal failure of the original ECM, including codes like P0601. However, if your check engine light is on due to a faulty sensor, wiring issue, or other mechanical problem, you will still need to diagnose and repair that separate issue. This module is a solution for a faulty computer, not a fix-all for every possible code.
Does this module come with a warranty?
Yes, all of our electronic modules are backed by a comprehensive warranty. We stand behind the quality of our parts and programming to give you peace of mind with your purchase. Please see the warranty tab for full details and duration.
Are there any other procedures needed after installation?
Besides the security relearn, it’s possible your vehicle may require a Crankshaft Position Sensor Variation Relearn (also known as a CASE relearn). This can often be done with a capable bidirectional scan tool. While many vehicles run perfectly fine without it, performing this relearn can prevent a P0315 code and ensure the most accurate misfire detection.