Is Your Buick Lucerne Running Rough?
If you’re dealing with a frustrating no-start condition, intermittent stalling, poor fuel economy, or a persistent Check Engine Light on your 2009-2011 Buick Lucerne, a failing Engine Control Module (ECM) is often the culprit. Over my 20+ years in the shop, I’ve seen how a faulty ECM can turn a reliable car into a source of constant headaches. It’s the brain of your engine, and when it starts to fail, it can cause a cascade of confusing and seemingly unrelated problems.
The Direct Solution: A Pre-Programmed 2009-2011 Lucerne Engine Control Module
Stop chasing symptoms and get to the root of the problem. This Engine Control Module is the definitive solution, arriving at your door completely programmed to your vehicle’s specific Vehicle Identification Number (VIN). We handle all the complex programming, loading the latest GM factory software updates before we ship. This means no expensive trips to the dealership for flashing or calibration. It’s designed to be a true plug-and-play fix.
Common Symptoms of a Failing Lucerne ECM:
- โ Unexplained Check Engine Light illumination
- โ Engine stalling or shutting off while driving
- โ Difficulty starting the engine or a complete no-start
- โ Noticeable decrease in gas mileage
- โ Rough idling or poor engine performance
- โ Communication errors with diagnostic scan tools
Expert Pro Tip from a 20-Year Technician
The ECM on the 4.6L Lucerne is located on the lower part of the air cleaner box. Over the years, I’ve diagnosed several ECM failures that were caused by excessive vibration from a broken or loose air cleaner box housing. Before installing your new module, take a moment to inspect the air box mounts. Ensure they are secure and not cracked. A solid mounting point is critical to protecting the delicate internal electronics of the new ECM and ensuring a long service life.
Plug-and-Play Installation: No Dealer Visit Required
We make this repair as straightforward as possible. By programming the module with your VIN, we eliminate the most difficult step. Once it arrives, you can get your Lucerne back to factory-spec performance right in your own garage.
- Safety First: Disconnect the negative terminal from your car’s battery.
- Locate the ECM: On your Lucerne, find the ECM mounted to the lower portion of the engine air cleaner box assembly.
- Disconnect Connectors: Carefully release the locking tabs and unplug the electrical wiring harnesses from the old module. Inspect the connectors for any corrosion or bent pins.
- Remove Old Module: Unbolt the old ECM from its mounting bracket on the air box.
- Install New Module: Mount your new, pre-programmed ECM in place of the old one and securely tighten the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new ECM until they click securely. Reconnect the negative battery terminal.
- Final Check: Start the vehicle and let it run for a few minutes. Your check engine light should be off and the engine should run smoothly. A security relearn procedure may be required, which typically involves turning the key to the ‘ON’ position for 10-15 minutes.
Guaranteed Compatibility
This module, part number 12639300, is a direct replacement for a wide range of GM vehicles. It is fully interchangeable with the following service numbers, ensuring a perfect match for your application: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, and 12678512. While this listing is focused on the Lucerne, it also fits many other models such as the Cadillac DTS, Chevy Colorado, GMC Canyon, and more. Please verify your part number or contact us to confirm fitment.