Is Your Buick Lucerne Running Rough? Get a Reliable Solution.
If you’re dealing with a persistent check engine light, unpredictable stalling, poor fuel mileage, or a no-start condition in your 2009-2011 Buick Lucerne, a failing Engine Control Module (ECM) is often the culprit. As the central computer for your engine, the ECM’s health is critical for performance and reliability. Driving with a faulty module can lead to further component damage and leave you stranded. This replacement ECM is the direct, dependable fix to get your car running smoothly again.
The Easiest ECM Replacement: Programmed & Ready to Install
Forget about expensive towing fees and dealership programming appointments. We take the hassle out of the repair. Before we ship your part, our in-house experts will flash this module with the latest official GM software updates, programmed specifically to your car’s unique Vehicle Identification Number (VIN). This ensures perfect communication with your vehicle’s systems right out of the box.
- โ VIN-Programmed for Your Lucerne: Arrives ready for installation, no extra steps needed.
- โ Restores Original Performance: Corrects issues like misfires, rough idle, and poor acceleration.
- โ Eliminates Dealer Costs: A true plug-and-play solution that saves you time and money.
- โ Guaranteed Compatibility: A direct replacement for a wide range of GM service numbers.
Real-World Diagnostic Story
“A customer’s 2010 Lucerne came into my shop last month with a stubborn P0304 (Cylinder 4 Misfire) code that wouldn’t clear. The owner had already replaced the spark plug, ignition coil, and fuel injector, but the misfire persisted. After running a full diagnostic, we confirmed all those parts were good. Using a scope, we found the injector driver signal from the original ECM was erratic. The internal circuit had failedโa common issue I’ve seen on these Northstar V8 platforms. We installed one of our pre-programmed modules, and the engine immediately smoothed out. The car has been running perfectly ever since. It’s a reminder that sometimes the problem lies with the computer, not the components it controls.”
Simple Installation Guide for your 2009-2011 Lucerne ECM
Replacing the ECM on your Lucerne 4.6L is a straightforward job you can do in your own driveway. The module is conveniently located in the lower part of the air cleaner box.
- Safety First: Disconnect the negative terminal from your car’s battery and wait 10 minutes for the systems to fully discharge.
- Access the Air Cleaner Box: Open the hood and locate the large black plastic air cleaner housing on the driver’s side of the engine bay.
- Locate the ECM: The ECM is mounted to the bottom portion of this air cleaner assembly. You may need to unclip the top of the airbox to gain better access.
- Disconnect the Wiring: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or bent pins.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New ECM: Mount your new, pre-programmed module in place, ensuring it is secure. Reconnect the electrical harnesses until they click firmly into place.
- Final Steps: Reassemble the air cleaner box and reconnect the negative battery terminal. Your Lucerne is now ready to start.
Guaranteed Fitment & Part Number Interchange
This module is a direct replacement for your original part and is guaranteed to fit your 2009-2011 Buick Lucerne with the 4.6L V8 engine. It also replaces the following GM and ACDelco service numbers, ensuring broad compatibility:
Interchangeable Part Numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512.
While this listing is for the Lucerne, this versatile ECM also fits a wide variety of other GM vehicles, including select models of the Cadillac DTS, STS, CTS, SRX, XLR; Chevy Colorado, Corvette, Trailblazer; GMC Canyon, Envoy; Hummer H3; and Saab 9-7X. Providing your VIN is essential to ensure we load the correct software for your specific make, model, and year.