Is Your Buick Lucerne Running Rough? The Engine Control Module Could Be the Culprit.
If your 2009-2011 Buick Lucerne is experiencing frustrating issues like a persistent check engine light, unexplained stalling, poor fuel economy, or a complete no-start condition, a failing Engine Control Module (ECM) is a likely cause. The ECM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to emissions controls and transmission shifting. When it begins to fail, it can create a cascade of problems that are often difficult to diagnose. This direct-replacement Engine Control Module, part number 12636659, is the definitive solution to restore your vehicle’s performance, reliability, and drivability.
From the Diagnostic Bay
We once had a 2010 Lucerne come into the shop with an intermittent stalling issue that no one could figure out. The owner had replaced the fuel pump, spark plugs, and even the throttle body, but the car would still randomly die at stoplights. After hours of diagnostics, we traced the issue to a heat-soaked ECM that was dropping communication. We installed a VIN-programmed module just like this one, and the car ran perfectly. The customer was thrilled to finally have a reliable vehicle again. It’s a perfect example of how the right part, correctly prepared, can solve even the most elusive problems.
The Critical Importance of VIN Programming
Simply installing a used or off-the-shelf ECM won’t work. Modern vehicles require the ECM to be programmed specifically to your car’s unique Vehicle Identification Number (VIN). This process syncs the module with your car’s anti-theft system (Pass-Key/VATS), transmission, and other onboard electronics. We handle this critical step for you. When you order, simply provide your VIN, and our technicians will flash this module with the latest GM-certified software for your exact vehicle. This ensures a seamless, plug-and-play installation, saving you a costly trip to the dealership for programming.
Symptoms of a Failing 2009-2011 Lucerne Engine Module
- ✔ Persistent and illuminated Check Engine Light (CEL)
- ✔ Engine stalling or shutting off while driving
- ✔ Difficulty starting the engine or a no-start condition
- ✔ Noticeable decrease in fuel efficiency
- ✔ Rough idling or engine misfires
- ✔ Hesitation or stumbling during acceleration
- ✔ Unexplained error codes stored in the system
- ✔ Automatic transmission shifting erratically or harshly
Guaranteed Fitment and Compatibility
This module is a direct replacement for a wide range of General Motors vehicles, ensuring OEM-level function and fit. It is interchangeable with several service numbers, making it a versatile solution. Please verify your vehicle is on the list below. This 2009-2011 Lucerne Engine Module is the correct part to get your car back in top condition.
Interchangeable Part Numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512
This part will fit these makes and models with these options:
CADILLAC CTS 09 Electronic Control Module; (RH front engine compartment), 6.2L
CADILLAC DTS 09-11 Electronic Control Module
CADILLAC SRX 09 Electronic Control Module; (LH engine compartment), (4.6L)
CADILLAC STS 09 Electronic Control Module; (LH frame rail), 4.4L or 4.6L
CADILLAC STS 10 Electronic Control Module; (LH frame rail), (4.6L)
CADILLAC XLR 09 Electronic Control Module; (RH front engine compartment), ID 12636659 or 12625453
CHEVROLET COLORADO 09 Electronic Control Module; (RH firewall)
CHEVROLET COLORADO 10-12 Electronic Control Module; (RH firewall), 2.9L or 3.7L
CHEVROLET CORVETTE 09 Electronic Control Module; (RH engine compartment), ZR1
CHEVROLET TRAILBLAZER 09 Electronic Control Module; (LH engine), 6.0L
GMC CANYON 09 Electronic Control Module; (RH firewall)
GMC CANYON 10-12 Electronic Control Module; (RH firewall), 2.9L or 3.7L
GMC ENVOY 09 Electronic Control Module; (LH engine), 5.3L
HUMMER H3 09-10 Electronic Control Module; (RH firewall)
SAAB 9-7X 09 Electronic Control Module; (LH engine)
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Just provide your vehicle’s VIN during checkout, and the module will arrive ready to install.
What is a VIN and where can I find it?
The VIN is your 17-digit Vehicle Identification Number. You can find it on your vehicle’s registration, insurance card, or on a small plate on the driver’s side dashboard visible through the windshield.
Is any additional relearn procedure required after installation?
In some cases, a Case Variation Relearn (also known as Crankshaft Position Sensor Relearn) may be needed with a professional scan tool to prevent a P1336 trouble code. Many vehicles will not require this, but it is a possibility.
Is this a used part?
This is a high-quality, tested, and inspected original equipment part that has been verified to meet or exceed factory specifications. It is not a new part, but a reliable and functional component.
What if I order the wrong part?
We strongly recommend verifying your part number and checking the fitment list before ordering. If you are unsure, please contact us with your VIN, and we will be happy to confirm compatibility for you.