Restore Peak Performance to Your Buick Lucerne
Is your 2009, 2010, or 2011 Buick Lucerne suffering from perplexing issues like poor fuel economy, erratic shifting, a persistent check engine light, or even a no-start condition? The Engine Control Module (ECM), the central computer of your vehicle, is often the culprit. This vital component manages everything from fuel injection and ignition timing to emissions controls and transmission function. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. This replacement Engine Control Module, part number 12628911, is the definitive solution to restore your vehicle’s factory performance and reliability.
The Plug-and-Play Solution for Your Vehicle
What sets this ECM apart is our professional programming service. Before this module ever ships, we use your vehicle’s unique Vehicle Identification Number (VIN) to flash it with the latest, most stable software updates directly from GM. This means the unit arrives at your door ready for installation, eliminating the need for an expensive trip to the dealership for programming. It’s a direct-fit, VIN-matched component designed to get you back on the road quickly and confidently.
From the Diagnostic Bay
We had a 2010 Lucerne come into the shop with a complaint that stumped two other mechanics. The car would randomly stall at stoplights, the cooling fans would run constantly, and it had a check engine light with a dozen unrelated communication codes. We checked grounds, wiring harnesses, and sensors for days. On a hunch, we connected a scope to the main communication lines at the ECM. We found the signal was noisy and dropping out intermittently. We installed one of these VIN-programmed modules, performed the security relearn, and the car ran perfectly. All the ghost codes vanished, and the stalling ceased. It’s a perfect example of how a failing ECM can mimic a multitude of other problems, making a quality, correctly programmed replacement essential.
Common Symptoms of a Failing ECM
- ✔ Persistent Check Engine Light (CEL) with codes related to module communication or sensor circuits.
- ✔ Unexplained drop in fuel efficiency.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start or no-crank condition.
- ✔ Intermittent electrical issues, like fans or fuel pump not activating correctly.
- ✔ Failure to pass state emissions testing.
Why Choose Our 2009-2011 Lucerne Engine Control Module?
This isn’t just a replacement part; it’s a comprehensive fix. Each module is meticulously inspected and tested to ensure full functionality. By programming it to your specific VIN, we ensure that it communicates flawlessly with all other modules in your vehicle, such as the Transmission Control Module (TCM) and Body Control Module (BCM). This process accounts for your vehicle’s specific options, emissions standards, and powertrain configuration, providing a level of precision that a generic, non-programmed unit simply cannot match. This is the most reliable and efficient way to solve complex engine management issues.
Wide-Ranging Compatibility
While this is the ideal 2009-2011 Lucerne Engine Control Module, its versatile E38 architecture was used across a wide array of GM vehicles. This unit is a direct replacement for multiple service numbers, including 12636659, 12639300, 12628993, and more. It is also compatible with models such as:
- 2009-2011 Cadillac DTS
- 2009 Cadillac STS / SRX / CTS-V
- 2009 Chevrolet Corvette / Trailblazer
- 2009-2012 Chevrolet Colorado / GMC Canyon
- 2009-2010 Hummer H3
- And many others as listed in the fitment guide.
Installation Process
Installation is straightforward for a skilled DIYer or any professional technician. After disconnecting the battery, simply locate the old ECM (on the Lucerne, it’s typically found on the lower part of the air cleaner box), disconnect the wiring harnesses, and swap in the new unit. After installation, you may need to perform a simple security relearn procedure (often called a Passlock or Passkey relearn), which can typically be done without special tools and takes about 30 minutes. Instructions for this procedure are widely available online or in service manuals.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to load the exact, correct GM software for your car’s specific engine, transmission, and options. This ensures a perfect match and seamless operation without any additional programming required on your end.
Is this part difficult to install?
For someone with moderate mechanical experience, the physical installation is simple. It involves disconnecting the battery, unplugging the old module, and plugging in the new one. The only additional step is a security relearn procedure, which can be done at home following simple instructions.
Will I need to do anything else after installing it?
In most cases, you will need to perform a security relearn procedure. This syncs the new ECM with your vehicle’s anti-theft system. It’s a simple process that typically involves turning the key to the ‘ON’ position for 10-15 minutes, three times in a row.
What happens if I provide the wrong VIN?
Providing the correct VIN is critical. An incorrect VIN will result in the wrong software being loaded, and the module will not function correctly in your vehicle. Please double-check your VIN from your driver’s side door jamb or dashboard before ordering.
Is this a new part?
This is a genuine, fully tested GM part that has been verified to meet or exceed all original factory specifications. We then program it with the latest software for your vehicle to ensure optimal performance and longevity.