Restore Peak Performance to Your Buick Lucerne
Is your 2009, 2010, or 2011 Buick Lucerne suffering from frustrating issues like a persistent check engine light, poor fuel economy, or erratic engine behavior? The problem often lies with a failing Engine Control Module (ECM), the central computer that manages your vehicle’s engine and transmission. This replacement ECM, part number 12630186, is the definitive solution to get your vehicle running like new again. We take the guesswork out of the repair by programming the module specifically to your vehicle’s VIN before it ships, ensuring a seamless and effective installation.
The Brain of Your Vehicle’s Operation
The ECM is critical for your Lucerne’s health. It constantly analyzes data from sensors throughout your engine to control fuel mixture, ignition timing, variable valve timing, and transmission shift points. When it begins to fail, it can cause a cascade of problems that are often misdiagnosed, leading to expensive and unnecessary repairs. Replacing a faulty module with a correctly programmed unit is the most direct path to resolving these complex electronic issues.
From the Diagnostic Bay
We recently had a 2010 Lucerne with the 3.9L V6 come into the shop. The owner was complaining of a random stalling issue and a check engine light with codes for multiple sensor circuits. They had already replaced two sensors with no luck. Our diagnostic process led us to test the ECM’s reference voltage outputs, which were fluctuating wildly. This confirmed an internal failure in the module. We installed a VIN-programmed ECM, performed the security relearn, and the car ran perfectly. It’s a prime example of how a single faulty computer can mimic multiple other problems.
Signs You Need a 2009-2011 Lucerne ECM Replacement
A failing engine computer can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your ECM may be the culprit. A proper diagnosis is always recommended, but these are the classic symptoms.
- ✔ Check Engine Light: The light is on, and you may have codes like P0601, P0606, or other communication-related faults.
- ✔ Poor Performance: Noticeable loss of power, hesitation during acceleration, and a general feeling that the engine is struggling.
- ✔ Reduced Fuel Economy: Your vehicle is suddenly using more fuel than usual without any change in your driving habits.
- ✔ Engine Stalling or Misfiring: The engine may stall intermittently, run rough, or misfire, especially under load.
- ✔ No-Start Condition: The engine cranks but refuses to start, even with a good battery and fuel supply.
- ✔ Transmission Problems: Harsh shifting, delayed engagement, or getting stuck in a single gear can be caused by a bad ECM.
Guaranteed Compatibility and Easy Installation
This module is a direct replacement for service numbers 12597125, 12612397, 12594750, 12629019, 12635902, and 12611549. To ensure a perfect match, we flash the unit with the latest GM-certified software using the VIN you provide during checkout. This critical step ensures all vehicle-specific systems, including anti-theft and optional equipment, function correctly. Once installed, you will only need to perform a simple security relearn procedure, which can often be done without special tools.
While this listing is focused on the 2009-2011 Lucerne ECM, this versatile module also fits a wide range of other GM vehicles, including the Chevrolet Malibu, Impala, Cobalt, HHR, Silverado 1500, Pontiac G6, Saturn Aura, and more. Please verify the part number to confirm fitment for your specific application.
Frequently Asked Questions
Do I need to have this ECM programmed?
No. We handle the programming for you before we ship the part. You must provide your vehicle’s 17-digit VIN at checkout so we can load the correct software for your specific car.
What is a security relearn procedure?
After installation, your vehicle’s anti-theft system needs to synchronize with the new ECM. This is a simple procedure, often called a ‘key-cycle relearn,’ that typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Instructions are readily available online for your specific model.
How do I know for sure that my ECM is the problem?
While the symptoms listed are strong indicators, the only way to be 100% certain is through professional diagnosis. This usually involves checking for specific diagnostic trouble codes (DTCs), testing sensor power and ground circuits at the ECM, and verifying communication on the vehicle’s data network.
Where is the ECM located on a 2009-2011 Buick Lucerne?
On the Buick Lucerne with the 3.9L engine, the Engine Control Module is typically located in the lower part of the air cleaner box assembly in the engine bay. This placement helps protect it from excessive heat and vibration.
Is this a new or used part?
This is a quality, tested, and inspected used component that has been verified to be in excellent working condition and is ready for programming and installation in your vehicle.