Restore Your Buick’s Brain and Drivability
If your 2008 Buick Lucerne is suffering from baffling electrical issues, a persistent Check Engine Light, or unpredictable performance problems, the culprit is often the Engine Control Module (ECM). As a technician with over two decades of experience, I’ve seen firsthand how a failing ECM can cause chaos, turning a reliable vehicle into a source of constant frustration. This isn’t just a part; it’s the central computer responsible for engine performance, fuel economy, and emissions. When it fails, nothing else works right.
We offer a dependable and straightforward solution. This genuine GM Engine Control Module, service number 12607096, is the definitive fix for a faulty unit. The best part? We eliminate the most significant hurdle in this repair: programming. Simply provide us with your vehicle’s VIN during checkout, and our experts will flash the module with the latest, most stable GM software specifically for your car. It arrives at your door ready for installation, saving you a costly trip to the dealership and hours of diagnostic headaches.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Lucerne with the 4.6L V8 that two other shops couldn’t fix. The car would randomly stall at stoplights and occasionally refuse to start, but it never stored consistent trouble codes—just a fleeting U0100 (Lost Communication with ECM). They had already replaced the battery and alternator. In my diagnostic bay, I monitored the ECM’s power and ground feeds while wiggling the harness—rock solid. The issue wasn’t external. The problem was an intermittent internal failure within the original ECM, a common issue caused by heat cycles and vibration over many years. Replacing it with a properly programmed module like this one solved the problem permanently. The customer was thrilled to have their smooth, reliable Lucerne back.
Is Your Buick Exhibiting These ECM Failure Signs?
A failing ECM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine module needs attention. Replacing a faulty 2008 Lucerne Engine Module is critical for restoring safety and performance.
- ✔ Persistent Check Engine Light (CEL) on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0606, or U0100.
- ✔ Unexplained engine stalling or stumbling, especially when warm.
- ✔ Complete no-start or crank-no-start condition.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Poor engine performance, hesitation, or misfires.
- ✔ Transmission shifting issues or erratic behavior.
- ✔ Inability for a scan tool to communicate with the ECM.
A Straightforward Guide to Installation
Installing your new 2008 Lucerne Engine Module is a manageable task for a confident DIYer. Since we handle the programming, you can skip the dealership visit. Follow these general steps for a successful replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- Locate the ECM: On the 2008 Buick Lucerne, the Engine Control Module is typically found bolted to the lower part of the air cleaner housing assembly in the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. They have locking tabs that must be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Mount the new, pre-programmed ECM in the exact same position. Securely reconnect the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. The vehicle may need to complete a security relearn procedure, which can often be done by cycling the key. Start the engine and verify that the Check Engine Light is off and the car runs smoothly.
Verified Compatibility for Your Vehicle
This ECM is a direct replacement for service number 12607096 and is interchangeable with part numbers 12590032, 12602044, 12603530, 12605843, 12630457, and 19210737. It is guaranteed to fit a wide array of GM vehicles. Please verify your vehicle, year, and engine options below to ensure a perfect match. Matching the ID number from your original part is always the best practice.
Fits: 2008 Buick Lucerne (4.6L, ID 12607096), as well as numerous other Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Pontiac, and Saab models from approximately 2005-2010. Please consult the full fitment chart or contact us with your VIN to confirm.
Frequently Asked Questions About This ECM
What do I need to do after I purchase?
After you place your order, you must send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot ship your part until we have this information, as we use it to program the module specifically for your car.
Is this part truly plug-and-play?
Yes. Because we flash it with your vehicle’s VIN and the latest GM software updates, it will not require any additional programming from a dealer. Once installed, your vehicle will recognize it. In some cases, a simple security relearn procedure (like turning the key on for 10 minutes) may be necessary.
Will this fix my car’s problem for sure?
This module will correct any issues directly caused by a failing ECM. While the symptoms listed are common for ECM failure, we always recommend a proper diagnosis by a qualified mechanic to rule out other potential causes like wiring or sensor issues.
How do I find my original part number?
The service number is printed on a sticker directly on your current ECM. Matching this number is the most reliable way to confirm you are ordering the correct part.
Do I need to send my old module back?
No, there is no core charge or requirement to return your old part. You can recycle it locally.
What if my part number is slightly different?
This module is interchangeable with several service numbers, including 12590032, 12602044, and more. If your number is on our interchange list, this part will work for you. If you are unsure, contact us with your VIN and original part number.