Is Your Vehicle Experiencing Engine Problems?
If your 2009-2011 Buick Lucerne, or another compatible GM vehicle, is suffering from frustrating issues like a persistent check engine light, sudden stalling, poor fuel economy, or a complete failure to start, the root cause is often a failing Engine Control Module (ECM). As the central computer for your engine, the ECM manages everything from fuel injection and spark timing to transmission shifting. When it begins to fail, it can create a cascade of problems that are difficult to diagnose and can leave your vehicle unreliable.
This genuine GM Engine Control Module, service number 12630464, is the definitive solution to restore your vehicle’s performance and reliability. We eliminate the biggest hurdles of ECM replacement: the need for expensive dealership programming and software flashing. Before we ship your part, our technicians will program it with the latest official GM software updates, specifically coded to your vehicle’s unique VIN. This ensures a seamless, plug-and-play installation process, getting you back on the road faster and with confidence.
From the Diagnostic Bay
We once had a 2010 Chevrolet Colorado come into the shop with a mysterious no-start condition. The owner had already replaced the battery, starter, and fuel pump with no success. The engine would crank but never fire. When we connected our diagnostic scanner, we found no communication with the engine control module. After checking the power and ground circuits to the ECM and finding them intact, we knew the module itself had failed internally. We installed a VIN-programmed ECM, and the truck fired up on the very first try. It’s a prime example of how a single electronic component can mimic multiple mechanical failures, making a correct diagnosis essential.
Key Symptoms of a Failing Engine Computer
- ✔ Persistent Check Engine Light (CEL) that may appear and disappear.
- ✔ Engine stalling, stumbling, or misfiring while driving.
- ✔ A noticeable and unexplained drop in fuel mileage.
- ✔ Difficulty starting the engine or a complete no-start condition where the engine cranks but won’t turn over.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Loss of power or sluggish acceleration.
- ✔ Communication errors when trying to use an OBD-II scan tool.
The Advantage of a VIN-Programmed 2009-2011 Lucerne ECM
Ordering a pre-programmed module is the smartest way to handle this repair. A new, unprogrammed computer from a dealership requires towing your vehicle to them for an expensive and time-consuming flashing procedure. Our service integrates this essential step into the purchasing process. By providing your VIN at checkout, you receive a unit that is ready for installation right out of the box. It’s loaded with the correct software for your specific engine, transmission, and factory options, ensuring all systems communicate and function as the manufacturer intended.
This module is a direct replacement for a wide range of GM vehicles and is interchangeable with several part numbers, including: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512. Please verify the part number on your original module or consult our fitment list to ensure compatibility.
Frequently Asked Questions
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) allows us to load the exact, vehicle-specific software from GM. This programming ensures the ECM communicates correctly with your engine, transmission, anti-lock brakes, and other onboard systems, making the installation process plug-and-play.
Is this part difficult to install?
For most vehicles, the ECM is in an accessible location (often on the firewall or near the air cleaner box). The physical replacement typically involves disconnecting the battery, unplugging a few electrical connectors, and removing a few bolts. After installation, a security relearn or crankshaft position sensor relearn may be required, which can be done with specific procedures or a capable scan tool.
Will this fix my check engine light?
If the check engine light is caused by a faulty ECM, then yes, this replacement part will resolve the issue. However, it’s crucial to ensure the codes have been properly diagnosed, as the light can also be triggered by faulty sensors or other mechanical problems.
What is the difference between an ECM, ECU, and PCM?
These terms are often used interchangeably. ECM (Engine Control Module) and ECU (Engine Control Unit) refer to the same component. PCM (Powertrain Control Module) is a more advanced module that controls both the engine and the transmission. For your vehicle, this part serves as the primary engine computer.
Is this a brand new part?
This is a high-quality, inspected, and tested original equipment part that has been professionally programmed to function according to OEM standards. It provides the same reliability and performance as a new module from the dealer at a fraction of the cost.