Is Your Buick Lucerne Running Rough?
If your 2009-2011 Buick Lucerne is suffering from frustrating issues like a persistent check engine light, poor fuel economy, stalling, or erratic engine behavior, a failing Engine Control Module (ECM) is often the culprit. The ECM is the central computer of your vehicle, and when it starts to fail, it can cause a cascade of confusing problems that are difficult to diagnose. Don’t keep throwing money at new sensors and parts hoping for a fix. This is the direct, reliable solution to restore your car’s performance and peace of mind.
The Plug-and-Play Solution: No Dealer Visit Required
We take the guesswork and high cost out of the repair. Unlike a generic module from a parts store, this ECM comes fully programmed with the latest official GM software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures that all systems, from the engine to the transmission, communicate perfectly right out of the box. You get a part that’s ready for immediate installation, saving you from a costly and time-consuming trip to the dealership for programming.
Real-World Diagnostic Story
“A customer’s 2010 Lucerne 4.6L came into my shop last month with a random misfire on cylinder 3 that nobody could solve. They had already replaced the coil, plug, and injector, but the P0303 code kept coming back. After scoping the coil trigger signal directly at the ECM connector, we saw the signal was dropping out intermittently. The problem wasn’t the ignition parts; it was a failing driver inside the original ECM. We installed one of our pre-programmed modules, and the car has been running perfectly ever since. It’s a classic case where chasing symptoms costs more than fixing the root cause.”
Common Symptoms of a Failing Lucerne ECM:
- âś” Persistent Check Engine Light (CEL) with various codes
- âś” Engine stalling or shutting off while driving
- âś” Noticeable decrease in fuel mileage
- âś” Rough idling or engine hesitation
- âś” Harsh or incorrect transmission shifting
- âś” Complete no-start condition
- âś” Communication errors with diagnostic scan tools
Easy Installation Guide for your 2009-2011 Lucerne Engine Control Module
Replacing the ECM on your Lucerne is a straightforward job you can do at home. The module is conveniently located to make the swap simple.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: Open the hood and find the air cleaner box assembly on the driver’s side of the engine bay. The ECM is mounted to the lower part of this box.
- Disconnect Wiring: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them.
- Remove the Old Module: Unbolt the ECM from its mounting bracket on the air cleaner box.
- Install the New Module: Mount your new, pre-programmed ECM in place and securely tighten the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new ECM until they click into place. Reconnect the negative battery terminal.
- Final Step: Start the engine. The vehicle will perform a security relearn procedure on its own, and you’ll be ready to drive.
Guaranteed Compatibility
This ECM is a direct replacement for several GM service numbers, ensuring a perfect fit and function for your vehicle. It is interchangeable with the following part numbers:
12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512
While this listing is focused on the Buick Lucerne, this versatile module also fits a wide range of other GM vehicles, including models from Cadillac, Chevrolet, GMC, Hummer, and Saab. Please verify the part number and your vehicle’s options to ensure compatibility.