Restore Peak Performance to Your Vehicle with a VIN-Programmed Engine Control Module
Is your 2009-2011 Buick Lucerne, or another compatible GM vehicle, suffering from perplexing issues like stalling, poor fuel economy, a persistent check engine light, or a complete no-start condition? The Engine Control Module (ECM), often called the brain of your vehicle, is a likely culprit. This critical component manages everything from fuel injection and ignition timing to emissions controls and transmission shifting. When it fails, it can cause a cascade of problems that are frustrating and difficult to diagnose. This replacement ECM, part number 12628993, is the definitive solution to get your vehicle running reliably again.
Unlike generic modules that require expensive trips to the dealership for programming, this unit arrives at your door fully programmed to your specific vehicle. We use your Vehicle Identification Number (VIN) to load the latest, most stable software updates directly from GM. This ensures perfect communication between the ECM and all other vehicle systems, restoring the original factory performance and efficiency. It’s a direct-fit, plug-and-play solution designed to eliminate guesswork and get you back on the road quickly.
From the Diagnostic Bay
We had a 2010 Buick Lucerne with the 4.6L V8 come into the shop with a complaint of intermittent stalling at stoplights and a check engine light for random misfires. The owner had already replaced the spark plugs, ignition coils, and even the fuel pump based on advice from various forums, but the problem persisted. After hooking up our professional scan tool, we noticed erratic data from the crankshaft position sensor and injector pulse width. Instead of just replacing more parts, we checked the wiring to the ECM and found it was perfect. The issue was internal to the module itself; the processor was failing under heat soak. We installed a VIN-programmed ECM just like this one, performed the security relearn, and the car ran perfectly. It’s a classic case where chasing symptoms instead of diagnosing the core problem costs time and money. A faulty ECM can mimic many other failures.
Symptoms of a Failing 2009-2011 Lucerne ECM
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your ECM may need replacement:
- ✔ Check Engine Light: The light is on, and you may have codes related to sensor circuits, module communication, or processor faults.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire, especially as it warms up.
- ✔ No-Start Condition: The engine cranks but refuses to start, often due to a lack of fuel injector pulse or spark.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in MPG can be caused by the ECM failing to properly manage the air-fuel mixture.
- ✔ Transmission Shifting Problems: The ECM works with the transmission control module, and a fault can lead to harsh shifting, or getting stuck in gear.
- ✔ Intermittent Electrical Issues: Seemingly unrelated problems with cooling fans, gauges, or other systems can sometimes be traced back to a faulty ECM.
Guaranteed Fitment and Compatibility
This ECM is a direct replacement for original part number 12628993 and is also interchangeable with the following GM service numbers: 12636659, 12639300, 1263605, 12628911, 12625453, 12622175, 12630464, and 12678512. It is engineered to fit a wide range of GM vehicles. Please verify your part number and vehicle fitment from the list below:
- Buick Lucerne: 2009-2011 (4.6L, located in lower part of air cleaner box)
- Cadillac CTS: 2009 (6.2L)
- Cadillac DTS: 2009-2011
- Cadillac SRX: 2009 (4.6L)
- Cadillac STS: 2009-2010 (4.4L, 4.6L)
- Cadillac XLR: 2009
- Chevrolet Colorado: 2009-2012 (2.9L, 3.7L)
- Chevrolet Corvette: 2009 (ZR1)
- Chevrolet Trailblazer: 2009 (6.0L)
- GMC Canyon: 2009-2012 (2.9L, 3.7L)
- GMC Envoy: 2009 (5.3L)
- Hummer H3: 2009-2010 (3.7L)
- Saab 9-7x: 2009
Frequently Asked Questions
Do I need to have this ECM programmed by a dealer?
No. We handle the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for installation, loaded with the latest GM software for your specific car.
What tools are needed for installation?
Installation is typically straightforward. You will need basic hand tools like a socket set to disconnect the battery and remove the mounting bolts for the ECM. The most important step is to disconnect the vehicle’s battery before you begin to avoid any electrical damage.
Where is the ECM located on my 2010 Buick Lucerne?
For the 2009-2011 Buick Lucerne with the 4.6L Northstar V8, the ECM is located inside the lower portion of the air cleaner box assembly in the engine bay.
Will I need to perform any other procedures after installation?
In most cases, you will need to perform a simple security relearn procedure (also known as a Passlock or anti-theft relearn). This procedure can be done without any special tools and typically involves a series of key cycles. Instructions are readily available online or in your vehicle’s service manual.
Is this a new or used part?
This is a high-quality, tested, and verified used OEM part. Each unit is inspected and then programmed with certified GM software to ensure it meets or exceeds original factory specifications for performance and reliability.