Restore Peak Performance to Your Buick Lucerne
If your 2009, 2010, or 2011 Buick Lucerne is suffering from perplexing issues like a persistent check engine light, poor fuel economy, hesitation, or even a no-start condition, the root cause is often a failing Engine Control Module (ECM). As the central computer of your vehicle’s engine, the ECM is responsible for managing everything from fuel injection and ignition timing to emissions controls. When it falters, the entire driving experience is compromised. This genuine GM Engine Control Module, part number 12636659, is the definitive solution to restore your vehicle’s original performance, reliability, and efficiency.
From the Diagnostic Bay
We had a 2010 Lucerne come in that was a real head-scratcher. The owner complained of random stalling at traffic lights and an occasional hard shift that no transmission shop could diagnose. We checked all the usual suspects—sensors, wiring, fuel pressure—and everything seemed fine. The codes were intermittent and pointed in different directions. On a hunch, we monitored the live data from the ECM and noticed erratic voltage readings just before a stall. We swapped in a programmed replacement ECM, and the car ran perfectly. It’s a classic case of how a failing computer can create phantom mechanical issues, making a direct-fit, properly programmed module an essential diagnostic step and final repair.
Is Your Vehicle Showing Signs of a Failing ECM?
- âś” Check Engine Light: The most common symptom, often with codes related to sensors, misfires, or internal computer failure.
- âś” Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, or rough idling.
- âś” Reduced Fuel Economy: A faulty ECM can’t properly manage the fuel mixture, leading to more trips to the gas station.
- âś” Starting Problems: The vehicle may crank but fail to start, or it may not crank at all.
- âś” Erratic Shifting: The ECM communicates with the transmission controller; a failure can cause harsh or unpredictable gear changes.
- âś” Intermittent Stalling: The engine may shut off unexpectedly while driving or when stopped.
The Critical Advantage: VIN-Specific Programming
Simply installing a used or off-the-shelf computer won’t work. Modern vehicles require the ECM to be programmed with the vehicle’s specific Vehicle Identification Number (VIN) to communicate with other modules and operate correctly. We handle this critical step for you. When you order, provide us with your VIN, and our technicians will flash this module with the latest, most stable software updates directly from GM. This ensures a seamless, plug-and-play installation without the need for an expensive trip to the dealership. You receive a part that is 100% ready for your vehicle right out of the box.
Your Solution for a Reliable 2009-2011 Lucerne ECM
Don’t let a faulty computer keep your car off the road. This replacement 2009-2011 Lucerne ECM is not just a part; it’s a complete solution. By matching the software to your exact vehicle, we eliminate the guesswork and ensure that complex systems like anti-theft (Pass-Key/VATS) and emissions controls function as the factory intended. This module is a direct replacement for a wide range of GM service numbers, guaranteeing broad compatibility and OEM-level function.
Guaranteed Fitment & Interchangeability
This ECM is the specified replacement for service number 12636659 and is also a direct interchange for the following part numbers: 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512. While it is the primary computer for the 2009-2011 Buick Lucerne with the 4.6L engine, it also fits a wide array of other GM vehicles, including select models of the Cadillac DTS, Chevrolet Colorado, GMC Canyon, Hummer H3, and more. Please verify the part number to ensure correct fitment for your specific application.
Getting your vehicle back to factory-spec operation is simple. Order this pre-programmed 2009-2011 Lucerne ECM today, provide your VIN, and install a reliable, fully updated engine computer tailored specifically for your car.
Frequently Asked Questions
Do I need to have 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 with the latest GM software, ready for installation. This saves you the time, cost, and hassle of a dealership visit.
What is an ECM and what does it do?
The Engine Control Module (ECM) is your car’s main computer for the engine. It takes data from sensors all over the engine and uses it to control fuel injection, spark timing, and emissions systems to ensure the engine runs efficiently and powerfully.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, your insurance card, or on the driver’s side of the dashboard, visible through the windshield.
Is this part difficult to install?
For the Buick Lucerne, the ECM is located in the lower part of the air cleaner box, making it relatively accessible. Installation typically involves disconnecting the battery, unplugging the old module’s electrical connectors, swapping the units, and reconnecting everything. While it’s a straightforward job for many DIYers, we always recommend consulting a service manual or a professional technician if you are unsure.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the ECM, then yes, this part will resolve the issue. However, the check engine light can be triggered by many other components, like a faulty sensor or a loose gas cap. It is always best to have the codes read by a scanner to properly diagnose the problem before ordering.
What happens if I provide the wrong VIN?
Providing the correct VIN is absolutely critical. An incorrect VIN will result in the wrong software being loaded onto the module, and your vehicle will not start or run correctly. Please double-check your VIN for accuracy before submitting your order.