Is Your Buick Lucerne Running Rough? It Could Be the ECM.
If your 2009, 2010, or 2011 Buick Lucerne is experiencing frustrating issues like erratic engine behavior, a persistent Check Engine Light, poor fuel economy, 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. When it begins to fail, it can cause a cascade of problems that are often difficult to diagnose. This direct-fit Engine Control Module, part number 12628993, is the definitive solution to restore your vehicle’s performance, reliability, and drivability.
From the Diagnostic Bay
We recently had a 2010 Lucerne come into the shop that had its owner completely stumped. He had replaced the spark plugs, ignition coils, and even a mass airflow sensor trying to chase down an intermittent stalling issue and a P0606 (ECM Processor Fault) code. After hours of diagnostics, we determined the internal processors of the original ECM were failing under heat. By installing a correctly programmed 2009-2011 Lucerne Engine Module, we resolved all the issues in one go. The customer was thrilled to have his smooth, reliable car back, and it was a powerful reminder that sometimes the ‘brain’ is the problem, not the parts it controls.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on with various, often inconsistent, trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Transmission shifting issues or harsh engagement.
- ✔ The vehicle won’t start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Misfire codes even after replacing coils and plugs.
The Plug-and-Play Solution for Your 2009-2011 Lucerne Engine Module
Don’t waste time and money at the dealership. We take the guesswork and complexity out of replacing your ECM. When you order from us, we use the Vehicle Identification Number (VIN) you provide to flash this module with the latest, most stable software updates directly from GM. This ensures that the computer is perfectly matched to your Lucerne’s specific configuration, including its engine, transmission, and factory options. The result is a simple installation process that gets you back on the road quickly. This module is a direct replacement for a wide range of GM service numbers, ensuring broad compatibility.
This module is a direct replacement for the following service numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512.
While this unit is programmed for your vehicle, some models may require a simple, on-vehicle procedure like a security relearn or crankshaft position sensor relearn, which can often be done without special tools. Instructions are readily available for these quick procedures. By installing this pre-programmed 2009-2011 Lucerne Engine Module, you are restoring the core of your vehicle’s management system to factory-spec condition.
Frequently Asked Questions
Do I need to have this module programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and we will flash the module with the correct GM-certified software for your specific car.
Is this a difficult part to install?
For most DIY mechanics, this is a straightforward installation. The ECM on the Lucerne is typically located in the lower part of the air cleaner box. It involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module to swap in the new one. Some vehicles may require a security relearn procedure after installation, which can usually be done at home.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your car. It contains critical information about the make, model, year, engine, and factory options. We use this information to load the precise software your vehicle requires for optimal performance and function.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by a faulty ECM, then yes, this part will resolve the issue. It’s crucial to ensure that the codes stored in the computer (e.g., P0601, P0606) point to an internal module failure and not a separate sensor or wiring problem.
What if I have another GM vehicle?
This ECM, part number 12628993, fits a wide variety of GM vehicles from 2009-2012, including the Cadillac DTS, Chevy Colorado, GMC Canyon, Hummer H3, and more. Please check the detailed fitment list on this page to confirm compatibility with your specific make and model.