Is Your Buick LaCrosse Experiencing Frustrating Engine Problems?
If your 2010-2011 Buick LaCrosse is suffering from erratic behavior like stalling, poor fuel economy, a persistent check engine light, or even a no-start condition, a failing Engine Control Module (ECM) is a very likely culprit. The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it begins to fail, it can create a cascade of confusing and disruptive issues that can make your car unreliable and unsafe to drive.
This replacement Engine Control Module, part number 12635019, is the definitive solution to restore your vehicle’s factory performance and reliability. We take the guesswork out of the repair by programming the module specifically to your vehicle’s Vehicle Identification Number (VIN) before it ships. This ensures that all factory settings and the latest GM software updates are loaded, making the installation process as smooth as possible.
From the Diagnostic Bay
We had a 2011 Buick LaCrosse 3.6L come into the shop with a complaint of intermittent stalling at stoplights and a check engine light that would come and go. The owner had already replaced the spark plugs and a camshaft position sensor with no luck. Our initial scan pulled a handful of communication error codes (U-codes) and a random misfire code. Instead of just throwing more parts at it, we monitored the live data stream from the ECM. We noticed that the 5-volt reference signal to several key sensors would drop out unpredictably, just before the engine would stumble. This pointed directly to an internal fault within the ECM itself. After installing a VIN-programmed module just like this one, we cleared the codes and took it on an extended test drive. The stalling was gone, the engine ran smoothly, and all communication was restored. It’s a classic case where the ‘brain’ was the problem, not the ‘body’.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is illuminated with various, often inconsistent, trouble codes.
- ✔ Engine stalling or shutting off unexpectedly while driving or idling.
- ✔ Noticeable decrease in fuel efficiency for no apparent reason.
- ✔ Rough idling, engine hesitation, or misfires.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Transmission shifting issues, such as harsh shifts or getting stuck in gear.
- ✔ Communication errors with diagnostic scan tools.
Why a VIN-Programmed 2010-2011 LaCrosse ECM is Essential
Modern vehicles like your LaCrosse have complex systems that are uniquely calibrated at the factory. Simply installing a used or non-programmed ECM will not work. The module must contain the correct software and security information that matches your specific VIN. Our professional programming service ensures this critical step is done for you. We use the latest GM-certified software to load all necessary operational and security parameters, including the immobilizer system data. This means the module arrives ready to be installed and, in many cases, will be a plug-and-play solution.
Important Note for LaCrosse and Camaro Owners: Due to the specific security protocols on these models, we require you to send us your original ECM. We will professionally extract the unique immobilizer data from your old module and transfer it to your new one. This makes the new module truly plug-and-play, avoiding a costly and complicated trip to the dealership for additional security relearn procedures. We will provide clear instructions on this simple process after your purchase.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles equipped with the 3.6L V6 engine. It is fully compatible with the following part numbers:
- 19300015
- 19300014
- 12617230
- 12636355
- 12635019
This part will fit these makes and models with these options:
- LACROSSE 10-11 Electronic Control Module; (LH engine compartment), 3.6L
- ALLURE 10 Electronic Control Module; (LH engine compartment), 3.6L
- CAMARO 10-11 Electronic Control Module; 3.6L
- CTS 10-11 Electronic Control Module; (RH front engine compartment), 3.6L
- STS 10-11 Electronic Control Module; (RH engine), (3.6L)
- ACADIA 10-11 Electronic Control Module; (behind fan shroud)
- ENCLAVE 10-11 Electronic Control Module; (behind fan shroud)
- OUTLOOK 10 Electronic Control Module; (behind fan shroud)
- TRAVERSE 10-11 Electronic Control Module; (behind fan shroud)
Frequently Asked Questions
What do I need to do after I purchase?
After you place your order, you must provide us with your vehicle’s 17-digit VIN. We will contact you with instructions. This is a mandatory step, as we cannot ship the module until it has been programmed specifically for your car.
Why do I need to send my old ECM for my LaCrosse?
For the 2010-2011 LaCrosse and Camaro, the vehicle’s anti-theft (immobilizer) system is deeply integrated into the original ECM. To ensure a simple plug-and-play installation without needing dealer tools, we must transfer this security data from your old module to the new one. We will provide a shipping label and instructions.
Is any additional programming required after installation?
In most cases, no. Because we program the module to your VIN and handle the immobilizer data transfer for LaCrosse/Camaro, the unit should be ready to go upon installation. However, some vehicles may require a simple Crankshaft Position Sensor Relearn procedure, which can be performed with many common professional scan tools.
Where is the ECM located on my 2011 LaCrosse?
On the 2010-2011 Buick LaCrosse with the 3.6L engine, the ECM is typically located in the engine compartment on the driver’s side (LH side), often near the fuse box or battery. Always disconnect the battery before attempting to remove or install the module.
Will this fix my specific check engine light codes?
A faulty ECM can cause a wide variety of diagnostic trouble codes. While this module will resolve issues stemming from an internal ECM failure (like communication codes or 5-volt reference faults), it’s crucial to ensure that the codes are not being caused by other faulty sensors or wiring. Proper diagnosis is always recommended.