Is Your Buick Lucerne Running Rough?
If your 2009, 2010, or 2011 Buick Lucerne is suffering from inconsistent performance, a persistent Check Engine Light, or even a no-start condition, a failing Powertrain Control Module (PCM) could be the culprit. The PCM is the central brain of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting. When it starts to fail, it can cause a cascade of confusing and frustrating problems. Don’t let a faulty computer keep your car off the road. This direct-fit replacement engine computer, part number 12618028, is the reliable solution you need to restore your vehicle’s performance and dependability.
From the Diagnostic Bay
We had a 2010 Lucerne 3.9L come into the shop with a complaint that stumped a few other technicians. The car would randomly stall at stoplights, but with no consistent codes. Sometimes it would throw a communication error, other times a random sensor code. After hours of checking wiring harnesses and grounds, we finally hooked up a lab scope to the PCM outputs. We noticed the 5-volt reference signal would intermittently drop out, causing the sensors to go offline and the engine to stall. A new, properly programmed PCM fixed it instantly. These intermittent electrical gremlins are a classic sign of internal PCM failure.
The Simple Solution: A VIN-Programmed 2009-2011 Lucerne PCM
Replacing an engine computer used to mean a trip to the dealership and a hefty bill for programming. We’ve simplified the process. When you order this module, we will flash it with the latest official GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) during checkout. This ensures that when the part arrives, it’s ready to integrate with your Lucerne’s specific systems, including the engine, transmission, and anti-theft system. This is not a generic, one-size-fits-all solution; it’s a precisely prepared component for your car.
Symptoms of a Failing Buick Lucerne PCM
- ✔ Persistent and illuminated Check Engine Light (CEL)
- ✔ Engine stalling, stumbling, or hesitating during acceleration
- ✔ Unexplained drop in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Engine cranks but refuses to start
- ✔ Communication error codes with a scan tool (U-codes)
- ✔ Failure to pass state emissions testing
Installation and Setup
The PCM on the 2009-2011 Buick Lucerne is located in the engine bay, attached to the lower part of the air cleaner box. While replacement is straightforward for those with mechanical experience, we recommend following proper procedures. Always disconnect the negative battery terminal before beginning work. After installing the new module, you may need to perform a simple security relearn procedure, often called a “key-on/key-off” cycle, which allows the new PCM to recognize your vehicle’s anti-theft system. In some cases, a Crankshaft Position Sensor Variation Relearn (CASE Relearn) may be needed with a capable scan tool to ensure the smoothest engine operation and prevent misfire codes. This 2009-2011 Lucerne PCM is designed to restore factory function and get you back on the road with confidence.
This module is a direct replacement for service numbers including 12597125, 12612397, 12594750, 12629019, 12635902, and 12611549, and fits a wide range of other GM vehicles. Please verify the part number and fitment for your specific application.
Frequently Asked Questions
Do I need to program this computer?
No. We handle the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN when you place your order, and we will flash the module with the correct, updated software for your specific 2009-2011 Lucerne.
Where is the PCM located on my Buick Lucerne?
On the 2009-2011 Buick Lucerne with the 3.9L engine, the PCM (or ECM) is typically located in the engine compartment, mounted to the lower portion of the air cleaner assembly box.
What is a CASE Relearn and will I need to perform one?
A CASE (Crankshaft Angle Sensor Error) Relearn procedure synchronizes the new PCM with the crankshaft position sensor. While the vehicle will often run without it, performing this procedure with a compatible scan tool is recommended to prevent a P0315 code and ensure optimal engine timing and misfire detection.
Is this a plug-and-play part?
Because we program it to your VIN, it is very close to plug-and-play. After installation, you will likely need to perform a security relearn procedure, which can usually be done without special tools. This allows the module to sync with your car’s anti-theft system.
What information do you need from me to complete my order?
We only need your vehicle’s 17-digit VIN (Vehicle Identification Number). You can typically find this on your driver’s side dashboard (visible through the windshield), on the driver’s door jamb sticker, or on your vehicle’s registration and insurance documents.