Restore Peak Performance to Your GM 3.6L Engine
Is your 2010-2011 Buick LaCrosse, Cadillac CTS, or Chevy Traverse acting up? If you’re dealing with frustrating issues like intermittent stalling, a persistent check engine light, poor fuel economy, or a complete no-start condition, a failing Engine Control Module (ECM) is often the culprit. As the brain of your vehicle’s engine, a faulty ECM can cause a cascade of confusing problems. This replacement ECM is the reliable, straightforward solution to get your vehicle running smoothly again, without the high cost and hassle of a dealership visit.
We take the guesswork out of the repair. Before we ship your module, our technicians will flash it with the latest official GM software, precisely matched to your vehicle using the VIN you provide at checkout. This ensures perfect communication between the ECM and all other systems in your car. For owners of the 2010-2011 Buick LaCrosse and Chevrolet Camaro, we offer a special service to make your installation truly plug-and-play. To bypass the complex anti-theft systems in these models, we’ll need you to send us your original ECM. We’ll expertly transfer the immobilizer data to your new module, saving you from needing specialized tools or a trip to the dealer for security relearning procedures. We will contact you with simple instructions after your purchase.
A Technician’s Notebook: The Ghost in the Machine
I once had a 2011 Acadia in the bay with a problem that was driving the owner crazy. It would randomly refuse to start, but only after being driven for 30+ minutes. No check engine light, no consistent codes. After hours of checking fuel pressure, spark, and wiring, I noticed the cooling fans were running on high even with a cold engine—a classic sign of an ECM in distress. The internal processor was failing under heat, losing communication and defaulting to a ‘safe’ mode. Replacing the ECM with a properly programmed unit like this one solved the problem instantly. These intermittent issues are often the first sign of ECM failure, long before a hard code like P0601 (Internal Control Module Memory Check Sum Error) appears.
Common Signs of a Failing ECM
- âś” Check Engine Light is on with communication-related codes (e.g., U0100) or internal processor codes (P0601, P0606).
- âś” The engine cranks but refuses to start.
- âś” Unexplained drops in fuel efficiency.
- âś” Intermittent stalling or rough idling.
- âś” Automatic transmission shifts erratically or harshly.
- âś” Failure to pass state emissions testing.
- âś” Cooling fans run constantly, even when the engine is cool.
A Straightforward Guide to Installation
- âś” Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- âś” Locate the ECM: On the 2010-2011 LaCrosse, the ECM is found in the engine compartment on the left-hand (driver’s) side. For other models like the Traverse or Acadia, it’s typically located behind the fan shroud. Refer to your vehicle’s service manual for the exact position.
- âś” Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Do not force them.
- âś” Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- âś” Install the New Module: Mount your new, pre-programmed ECM and securely fasten the bolts.
- âś” Reconnect Everything: Plug the wiring harnesses back into the new ECM, ensuring they click into place. Reconnect the negative battery terminal.
- âś” Final Step (LaCrosse/Camaro Only): Because we’ve already transferred your immobilizer data, your vehicle should start and run without any additional security procedures. For all other models, you can now start the vehicle.
Verified Vehicle Compatibility
This module is a direct-fit replacement for the following vehicles equipped with the 3.6L V6 engine. It is compatible with part numbers 19300015, 19300014, 12617230, 12636355, and 12635019.
- 2010-2011 Buick LaCrosse (LH engine compartment)
- 2010-2011 Buick Allure (LH engine compartment)
- 2010-2011 Buick Enclave (Behind fan shroud)
- 2010-2011 Chevrolet Traverse (Behind fan shroud)
- 2010-2011 Chevrolet Camaro
- 2010-2011 Cadillac CTS (RH front engine compartment)
- 2010-2011 Cadillac STS (RH engine)
- 2010-2011 GMC Acadia (Behind fan shroud)
- 2010 Saturn Outlook (Behind fan shroud)
Frequently Asked Questions about the 2010-2011 LaCrosse ECM
Do I need to do any programming myself?
No. We handle all the programming before shipment. We flash the module with the latest GM software using your vehicle’s VIN, so it’s ready for installation right out of the box.
Why do I need to send my old ECM for a LaCrosse or Camaro?
These specific models have advanced anti-theft (immobilizer) systems. To ensure a true plug-and-play experience without needing a dealer, we transfer this security data from your old module to the new one. This is a critical service that saves you time and money.
Is this part a direct replacement for other part numbers?
Yes, this ECM, part number 12635019, is fully compatible with and replaces part numbers 19300015, 19300014, 12617230, and 12636355.
What happens if I don’t provide my VIN?
Providing your VIN is mandatory for this part. We cannot program and ship the ECM without it, as the software is specific to your exact vehicle configuration. Your order will be placed on hold until the VIN is received.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM (common codes P0601-P0606, U0100), then yes, this part is the correct fix. However, you should always have your vehicle properly diagnosed to ensure the ECM is the root cause of the problem.