Restore Your Vehicle’s Core Performance and Reliability
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Engine Control Module (ECM) can turn a reliable vehicle into a source of constant frustration. If your 2010-2011 LaCrosse, Acadia, CTS, or other compatible GM vehicle is suffering from a persistent Check Engine Light, erratic performance, or a dreaded no-start condition, the ECM is often the culprit. This isn’t just a component; it’s the brain of your engine, and when it falters, everything from fuel economy to shifting patterns can be affected. This replacement 2010-2011 LaCrosse Engine Module is the definitive solution to restore your vehicle’s factory performance and get you back on the road with confidence.
What sets this module apart is our comprehensive programming service. Before we ship it, we flash the module with the latest GM-authorized software updates, specifically tailored to your vehicle’s unique VIN. This critical step ensures seamless communication between the ECM and all other vehicle systems, eliminating the need for an expensive trip to the dealership for programming. It’s a direct-fit solution designed to work right out of the box.
A Technician’s Notebook: The Intermittent No-Start Mystery
I remember a 2011 Buick LaCrosse that came into my shop with a problem that was driving the owner crazy. It would start perfectly for a week, then suddenly refuse to crank for an hour. There were no consistent trouble codes, just a random U0100 (Lost Communication with ECM) that would pop up and disappear. We checked the battery, starter, and wiring harnesses—all were fine. On a hunch, I put a scope on the CAN bus lines at the ECM connector. During one of the no-start episodes, I saw the data signal drop completely. The ECM’s internal processor was failing intermittently due to heat soak. We replaced it with a VIN-programmed unit like this one, and the problem was solved for good. It’s a classic example of how a faulty ECM can create phantom issues that are nearly impossible to trace without pinpointing the source.
Common Signs of a Failing ECM
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your ECM may need replacement:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling, stuttering, or misfiring
- ✔ No-start or hard-starting conditions
- ✔ Noticeable decrease in fuel efficiency
- ✔ Poor acceleration or loss of power
- ✔ Transmission shifting issues or getting stuck in gear
- ✔ Communication error codes like U0100, U0101
- ✔ Internal module fault codes such as P0601, P0606, or P062F
A Straightforward Guide to Installation
Replacing the ECM on these vehicles is a manageable job for a DIYer with basic tools. The most important step is providing us your VIN for programming and, for LaCrosse/Camaro owners, following the immobilizer service instructions we provide after your purchase.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all systems to power down.
- Locate the ECM: On the LaCrosse, it’s typically in the engine compartment on the driver’s side (LH). On Traverse/Acadia/Enclave models, it’s often behind the fan shroud. Consult a service manual for your specific vehicle’s location.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old ECM. These have locking tabs, so don’t force them. Inspect the connectors 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 for the new module.
- Install the New Module: Mount your new, pre-programmed 2010-2011 LaCrosse Engine Module onto the bracket and securely tighten the bolts.
- Reconnect and Finalize: Plug the wiring harnesses firmly into the new ECM until they click into place. Reconnect the negative battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 19300015, 19300014, 12617230, 12636355, and 12635019, and is guaranteed to fit the following vehicles equipped with the 3.6L engine:
- 2010-2011 Buick LaCrosse
- 2010 Buick Allure
- 2010-2011 Cadillac CTS
- 2010-2011 Cadillac STS
- 2010-2011 Chevrolet Camaro
- 2010-2011 Chevrolet Traverse
- 2010-2011 GMC Acadia
- 2010-2011 Buick Enclave
- 2010 Saturn Outlook
Frequently Asked Questions
Do I need to do any programming myself?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. We flash the module with the latest GM software using the VIN you provide, so it’s ready for installation upon arrival.
Why do I need to send my old ECM for a LaCrosse or Camaro?
For the 2010-2011 LaCrosse and Camaro, the vehicle’s immobilizer (anti-theft) data is stored in the original ECM. To make your new module truly plug-and-play and avoid a complex security relearn procedure, we need to transfer this specific data from your old unit to the new one. We will provide instructions for this simple process after your purchase.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part. Each module is verified to be fully functional before being programmed and shipped, ensuring OEM-level reliability without the high dealership cost.
What is the part number for this 2010-2011 LaCrosse Engine Module?
This module, service part number 12636355, is a direct replacement for several other part numbers, including 19300015, 19300014, 12617230, and 12635019, ensuring broad compatibility across GM’s 3.6L platform.
What if I order the wrong part?
We guarantee fitment based on the VIN you provide. By programming the module specifically for your vehicle, we eliminate compatibility issues. Please double-check your vehicle’s year, make, model, and engine before ordering, or contact us for assistance.