Is Your Buick Lucerne Running Rough, Stalling, or Showing a Check Engine Light?
If you’re dealing with frustrating engine problems in your 2009, 2010, or 2011 Buick Lucerne, a failing Engine Control Module (ECM) is often the culprit. I’ve seen it countless times in my 20+ years as a technician. A car comes in with intermittent stalling, poor fuel economy, and a host of confusing error codes that don’t seem to point to a specific sensor. After hours of diagnostics, the root cause is traced back to the vehicle’s computer. This isn’t just a part; it’s the brain of your engine, and when it falters, the entire system suffers.
The Simple, Reliable Solution: A Pre-Programmed ECM
Forget about expensive dealership diagnostics and programming fees. This Engine Control Module is the direct, hassle-free solution you need. We take all the guesswork out of the repair. When you order, simply provide us with your vehicle’s VIN (Vehicle Identification Number). My team will then program the module with the very latest, most stable software updates directly from GM. It arrives at your door ready to install, saving you time, money, and a trip to the dealer.
Why Choose Our Pre-Programmed 2009-2011 Lucerne ECM?
Getting your Lucerne back to peak performance is our top priority. This module is a direct-fit replacement designed to solve common issues and restore factory operation.
- ✔ VIN-Programmed for Your Car: We flash the module specifically for your vehicle, ensuring perfect communication with all other onboard systems.
- ✔ Latest GM Software: Your ECM comes loaded with the newest software updates, which often correct drivability issues and improve efficiency beyond the original programming.
- ✔ No Dealer Visit Required: This is a true plug-and-play solution. Once installed, you’re ready to go.
- ✔ Solves Common Failure Symptoms: Effectively addresses issues like check engine lights (CEL), no-start conditions, erratic shifting, poor engine performance, and false sensor codes.
- ✔ Broad Compatibility: This unit is a direct replacement for a wide range of GM vehicles, ensuring a quality, tested part.
Simple Installation Guide
You can do this. Replacing the ECM on your Lucerne is straightforward. Here’s how:
- Safety First: Always disconnect the negative terminal from your car’s battery before working on electrical components.
- Locate the ECM: On the 2009-2011 Lucerne with the 4.6L V8, the ECM is located at the lower part of the air cleaner box assembly. You may need to remove the air filter housing to access it.
- Disconnect Wiring: Carefully release the locking tabs on the electrical connectors and unplug them from the old module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed ECM in place, and securely plug in the wiring connectors. You should hear a ‘click’ as they lock.
- Reconnect and Start: Reconnect the negative battery terminal. The vehicle is now ready to start. In some cases, a simple security relearn procedure (turning the key to ‘ON’ for 10 minutes) may be needed, but it does not require any special tools.
Guaranteed Fitment & Part Number Compatibility
This ECM, service number 12678512, is a direct replacement for a wide array of GM vehicles and part numbers. If your old module has any of the following numbers, this part is a guaranteed match:
Interchangeable Service Numbers: 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12622175, 12630464, 12678512
This part also fits the following vehicles (please verify options):
Buick Lucerne (09-11), Cadillac CTS (09), DTS (09-11), SRX (09), STS (09-10), XLR (09), Chevrolet Colorado (09-12), Corvette (09), Trailblazer (09), GMC Canyon (09-12), Envoy (09), Hummer H3 (09-10), and Saab 9-7x (09).