Restore Peak Performance to Your GM SUV or Sedan
Is your 2009 Chevrolet Traverse, GMC Acadia, or other GM vehicle experiencing frustrating and unpredictable engine problems? Issues like sudden stalling, a no-start condition, poor fuel mileage, or a dashboard lit up with warning lights often point to one culprit: a failing Engine Control Module (ECM). As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty ECM can turn a reliable vehicle into a source of constant stress. This isn’t just an inconvenience; it’s a safety concern. You need a solution you can trust, not a gamble from a salvage yard.
This is a direct-replacement Engine Control Module, part number 12628387, that arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We handle the complex part for you. Using certified equipment, we load the latest, most stable software updates directly from General Motors. This process corrects common factory bugs and ensures your engine, transmission, and fuel systems operate in perfect harmony, just as the engineers intended. By installing our pre-programmed 2009 Traverse Engine Module, you’re not just replacing a part—you’re restoring your vehicle’s core operational logic and reliability.
A Technician’s Notebook: The Phantom No-Start
I remember a 2009 Buick Enclave (which shares this exact ECM with the Traverse) that came into my bay on a tow truck. The owner was frustrated, having already replaced the battery and starter. The engine would crank but never fire. Scans showed a U0100 ‘Lost Communication with ECM’ code, but all the wiring and fuses checked out perfectly. This is a classic symptom I’ve seen dozens of times. The ECM’s internal processor was failing intermittently, especially after the engine bay warmed up. We installed a VIN-programmed module like this one, performed the 10-minute security relearn, and the vehicle fired up on the first try. The customer saved hundreds in diagnostic fees that would have been spent chasing phantom wiring issues.
Common Signs of a Failing ECM
- ✔ Check Engine Light is on with various, sometimes unrelated, trouble codes.
- ✔ Engine stalls for no reason, either while driving or at idle.
- ✔ Complete no-start condition, where the engine cranks but won’t turn over.
- ✔ Noticeable decrease in fuel economy and poor engine performance.
- ✔ Transmission shifting erratically or harshly.
- ✔ Communication error codes, such as U0100, are present.
- ✔ Internal module failure codes like P0601, P0606, or P062F are stored.
A Straightforward Guide to Installation
Replacing the 2009 Traverse Engine Module is a manageable job for a confident DIYer. The module is typically located behind the fan shroud at the front of the engine bay, making access relatively simple. Always consult a vehicle-specific repair manual if you are unsure.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the ECM: On the Traverse, Acadia, Enclave, and Outlook, it’s mounted behind the cooling fan shroud. You may need to remove a plastic cover for access.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Never force them. Inspect the pins for any corrosion.
- Remove the Module: Unbolt the old ECM from its mounting bracket. Note the orientation for when you install the new one.
- Install the New ECM: Mount the new, pre-programmed module in place and secure the bolts. Reconnect the wiring harnesses, ensuring they click securely into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: This is a critical step. You must perform the vehicle’s anti-theft relearn procedure (often called Passlock or Passkey). This typically involves turning the key to ‘ON’ for 10 minutes, ‘OFF’ for 10 seconds, and repeating this sequence three times. The vehicle will not start until this is completed.
Verified Vehicle Compatibility
This module is a guaranteed fit for the following vehicles and is a direct replacement for part numbers 12623325, 12628387, 12605672, 12630594, and 19300016. Please provide your VIN upon checkout to ensure perfect programming.
- 2009 Chevrolet Traverse (Electronic Control Module; behind fan shroud)
- 2009 GMC Acadia (Electronic Control Module; behind fan shroud)
- 2009 Buick Enclave (Electronic Control Module; behind fan shroud)
- 2009 Saturn Outlook (Electronic Control Module; behind fan shroud)
- 2009 Cadillac CTS (Electronic Control Module; RH front engine compartment, 3.6L, VIN V)
- 2009 Cadillac STS (Electronic Control Module; RH engine, 3.6L)
- 2008 Cadillac CTS (Electronic Control Module; RH front engine compartment, 3.6L, VIN V)
- 2008 Cadillac STS (Electronic Control Module; RH engine, 3.6L)
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming after I receive this ECM?
No. We program the module with the latest GM software using the VIN you provide before shipping. The only remaining step is the mandatory vehicle security relearn procedure, which does not require any special tools.
What is the security relearn procedure?
It’s a simple process that syncs the new ECM with your vehicle’s anti-theft system. For most of these GM models, it involves a 30-minute key cycle procedure. We include instructions to guide you through it.
How do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive this information.
Will this fix my specific problem?
This part corrects issues directly caused by a failing ECM. While symptoms like stalling or no-start are common indicators, it’s always best to have a proper diagnosis performed by a qualified mechanic to rule out other potential causes like fuel pump or sensor failures.
Is this a used part from a junkyard?
No. This is a high-quality, inspected, and tested module that is verified to be fully functional before being programmed with your vehicle’s specific software. It’s a reliable alternative to a new dealer part.