Restore Peak Performance to Your Buick Lucerne
Is your 2009, 2010, or 2011 Buick Lucerne suffering from frustrating issues like stalling, a persistent check engine light, or poor engine performance? The Engine Control Module (ECM), the central computer of your vehicle’s powertrain, is often the culprit. This direct-fit ECM, part number 12625453, is the definitive solution to restore your vehicle’s reliability and drivability. Unlike a generic part from a local store, this module is professionally programmed with the latest GM software updates specifically for your car’s Vehicle Identification Number (VIN). This ensures seamless integration and performance right out of the box, eliminating the need for an expensive trip to the dealership for programming.
Diagnosing a Faulty 2009-2011 Lucerne ECM
A failing engine computer can manifest in various ways, often mimicking other sensor or component failures. If you’ve been chasing down ghosts in your vehicle’s electrical system, it’s time to consider the ECM. A faulty module can disrupt critical calculations for fuel mixture, ignition timing, and transmission shifting, leading to a cascade of problems. This replacement unit is designed to correct those issues and bring your engine’s operation back to factory specifications.
From the Diagnostic Bay
We had a 2010 Buick Lucerne with the 4.6L V8 come into the shop with a very elusive problem: it would randomly stall at stoplights after driving for 20-30 minutes. There were no consistent trouble codes, just a few random communication errors. We checked fuel pressure, ignition components, and sensors, but everything tested fine. On a hunch, we used a heat gun to carefully warm up the ECM while the engine was idling. Within minutes, the engine sputtered and died. The thermal stress was causing an internal failure in the computer. We replaced it with a pre-programmed unit just like this one, and the customer reported the car drove better than it had in years. This simple fix saved them from potentially replacing hundreds of dollars in unnecessary parts.
Common Symptoms of ECM Failure
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Unexplained drops in fuel economy.
- ✔ Engine misfires, stumbles, or stalls intermittently.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication error codes (U-codes) when scanned.
- ✔ Loss of power and sluggish acceleration.
Plug-and-Play Installation Process
Our goal is to make your repair as simple as possible. When you order, you provide us with your vehicle’s VIN. Our technicians then use that information to load the correct, updated software onto the module. This process calibrates the ECM to your car’s specific engine, transmission, and options. When you receive the part, the process is straightforward: disconnect the battery, locate and swap the old module (on the Lucerne, it’s typically found on the lower part of the air cleaner box), and reconnect the battery. In most cases, no further procedures are needed to get your vehicle running properly again.
This module is a direct replacement for a wide range of GM vehicles and interchanges with several part numbers, including 12636659, 12639300, 12628993, and more, ensuring broad compatibility and a reliable fit.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for installation.
Where is the ECM located on my 2009-2011 Buick Lucerne?
The Engine Control Module on the 2009-2011 Lucerne with the 4.6L V8 engine is typically located on the lower part of the air cleaner box in the engine bay.
What is a VIN and why do you need it?
The VIN is your 17-digit Vehicle Identification Number. It contains specific information about your car’s make, model, engine, and factory options. We use it to load the exact software calibration your vehicle requires for proper function.
Will this part be compatible with my vehicle’s anti-theft system?
Yes. The programming we perform includes matching the module to your vehicle’s security system (VATS/Passlock), ensuring the car will start and run without any security-related issues.
How can I be sure my old ECM is the problem?
While the symptoms listed above are strong indicators, a definitive diagnosis from a qualified technician is the best way to be certain. Common diagnostic steps include checking for communication with a scan tool and verifying power and ground signals at the ECM connector.