If you’re dealing with frustrating engine problems in your 2010-2011 GMC Acadia—like stalling, a persistent check engine light, or a no-start condition—a failing Engine Control Module (ECM) is often the culprit. As a technician with over two decades of experience, I’ve seen how a faulty ECM can create a diagnostic nightmare. This isn’t just a part; it’s the brain of your engine, and when it malfunctions, your vehicle’s performance, reliability, and fuel economy suffer. We offer a direct, reliable solution: a replacement ECM, part number 12635019, programmed specifically for your vehicle.
Forget the hassle and expense of a dealership visit. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) at checkout, and we’ll flash this module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal performance right out of the box. For most compatible vehicles, this makes the installation a straightforward, plug-and-play process, getting you back on the road quickly and confidently.
Common Signs of a Failing Engine Computer
- ✔ Check Engine Light is illuminated with communication-related or internal processor fault codes (e.g., P0601, P0606, U0100).
- ✔ Your vehicle cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially after the engine warms up.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Poor engine performance, hesitation, or misfires.
- ✔ Automatic transmission shifting issues.
- ✔ Failure to pass an emissions test.
From the Diagnostic Bay: The Intermittent Acadia
I remember a 2011 Acadia that came into my shop with a problem that was driving the owner crazy. It would randomly stall at stoplights, and sometimes it wouldn’t start at all for hours. There were no consistent trouble codes, just a history of random communication errors. After checking all the usual suspects—battery, grounds, fuel pump—we focused on the ECM. On these Lambda-platform vehicles (Acadia, Enclave, Traverse), the ECM is mounted behind the fan shroud, where it’s subjected to constant heat cycles and vibration. These are killers for sensitive electronics. We swapped in a pre-programmed ECM, and the problems vanished instantly. The customer saved hundreds compared to the dealership and avoided weeks of guesswork.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the ECM: On the 2010-2011 Acadia, Enclave, and Traverse, the ECM is typically located behind the radiator fan shroud. You may need to remove the air intake ducting for better access.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket. Keep the hardware as you will need it for the new module.
- ✔ Install the New Module: Mount your new, pre-programmed ECM and securely tighten the bolts. Reconnect the electrical connectors until they click into place.
- ✔ Reconnect Battery: Reattach the negative battery terminal.
- ✔ Perform Security Relearn (If Needed): In many cases, you may need to perform a simple key-cycle security relearn procedure. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this process three times to sync the new ECM with your vehicle’s anti-theft system. Your vehicle should now start and run correctly.
This replacement 2010-2011 Acadia ECM is the definitive fix for a wide range of electronic issues, restoring your vehicle’s factory performance and reliability without the dealership price tag. It’s a solution I’ve trusted in my own repair bay for years.
Important Note for Camaro and LaCrosse Owners:
Due to the specific immobilizer systems in the 2010-2011 Camaro and LaCrosse, a fully plug-and-play installation requires us to transfer security data from your original module. If you purchase for one of these models, we will contact you with instructions to send your old ECM to us. This extra step ensures your new module works seamlessly without any additional programming.
Verified Vehicle Compatibility
This module is a direct replacement for part number 12635019 and is also compatible with 19300015, 19300014, 12617230, and 12636355. It is guaranteed to fit the following vehicles:
- ✔ 2010-2011 GMC Acadia (Electronic Control Module; behind fan shroud)
- ✔ 2010-2011 Buick Enclave (Electronic Control Module; behind fan shroud)
- ✔ 2010-2011 Chevrolet Traverse (Electronic Control Module; behind fan shroud)
- ✔ 2010 Saturn Outlook (Electronic Control Module; behind fan shroud)
- ✔ 2010-2011 Cadillac CTS (Electronic Control Module; RH front engine compartment, 3.6L)
- ✔ 2010-2011 Chevrolet Camaro (Electronic Control Module; 3.6L)
- ✔ 2010-2011 Buick LaCrosse (Electronic Control Module; LH engine compartment, 3.6L)
- ✔ 2010 Buick Allure (Electronic Control Module; LH engine compartment, 3.6L)
- ✔ 2010-2011 Cadillac STS (Electronic Control Module; RH engine, 3.6L)
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping it. This handles the necessary software setup, saving you a trip to the dealer. A simple security relearn procedure may be required after installation.
What is a VIN and where do I find it?
The VIN is your car’s 17-digit Vehicle Identification Number. You can find it on your vehicle’s registration, insurance card, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
Why do I need to send in my old ECM for a Camaro or LaCrosse?
These models have a more complex anti-theft system. To ensure a true plug-and-play experience, we need to extract specific immobilizer data from your original module and transfer it to the replacement. We will provide simple instructions after your purchase.
Is this a new or used part?
This is a high-quality, tested, and verified component that has been expertly prepared for service. Each unit is flashed with the latest GM software and is guaranteed to restore your vehicle’s functionality.
Will this 2010-2011 Acadia ECM fix my check engine light?
If your check engine light is caused by an internal failure of the original ECM (common codes include P0601, P0606), then this replacement module is the correct solution. It’s always best to have the codes professionally diagnosed to confirm the ECM is the root cause.