Restore Peak Performance to Your Buick Lucerne
Is your 2009, 2010, or 2011 Buick Lucerne suffering from frustrating issues like a persistent check engine light, rough idling, stalling, or poor fuel economy? These are classic signs of a failing Engine Control Module (ECM). The ECM is the central computer of your vehicle, orchestrating critical functions like fuel delivery, spark timing, and transmission shifts. When it begins to fail, the entire driving experience is compromised. This replacement ECM, part number 12629020, is the definitive solution to restore your vehicle’s reliability and performance.
From the Diagnostic Bay
We had a 2010 Lucerne with the 3.9L V6 come into the shop with an intermittent no-start condition that was driving the owner crazy. It would start fine for a week, then suddenly refuse to turn over. There were no consistent trouble codes, just a general communication error that would pop up occasionally. After checking all the usual suspects—battery, starter, grounds—we focused on the ECM. On a hunch, we connected a scope and monitored the 5-volt reference signal from the module. Sure enough, we saw the voltage drop out randomly. We swapped in one of our pre-programmed ECMs, and the problem vanished instantly. It’s a reminder that these complex electronic issues often lead back to the vehicle’s central computer.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is illuminated with codes like P0601, P0602, or P0606.
- ✔ Engine stalls, stumbles, or misfires unexpectedly.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ The vehicle fails to start or has difficulty starting.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
The Plug-and-Play Solution for Your 2009-2011 Lucerne ECM
Don’t waste time and money on a costly trip to the dealership. We provide a simple, effective solution. When you order this ECM, we will flash it with the latest official GM software updates specifically for your vehicle. All you need to do is provide us with your 17-digit Vehicle Identification Number (VIN) during or after checkout. This ensures complete compatibility with your Lucerne’s specific configuration. The module arrives at your door ready for installation, requiring no further programming. In most cases, a simple security relearn procedure (which you can do yourself in minutes) is all that’s needed to get you back on the road.
This module is a direct replacement for service numbers 12597125, 12612397, 12594750, 12629019, 12635902, and 12611549, ensuring broad compatibility. While this listing is focused on the 2009-2011 Buick Lucerne with the 3.9L engine, this versatile ECM also fits a wide range of other GM vehicles, including the Silverado, Malibu, Cobalt, HHR, and more. Please verify the part number to ensure it matches your specific application.
Frequently Asked Questions
Do I need to get this ECM programmed by a dealer?
No. We handle all the programming for you before we ship the part. Simply provide your vehicle’s VIN, and it will arrive ready to install.
Where is the ECM located on my 2009-2011 Buick Lucerne?
The ECM is typically found attached to the lower part of the air cleaner box in the engine compartment, making it relatively easy to access for replacement.
What information do you need from me?
We only need your vehicle’s 17-digit VIN to ensure the module is programmed with the correct software and calibrations for your specific car.
Will this fix my check engine light?
If the check engine light and associated drivability problems are caused by a faulty ECM, this replacement part is the correct solution to resolve those issues.
Is a security relearn procedure required after installation?
Yes, a simple security relearn is often necessary. This can typically be done without any special tools by cycling the ignition key and takes only a few minutes. We can provide instructions if needed.