Restore Peak Performance to Your GM 3.8L Engine
Is your Buick LaCrosse, Lucerne, or Pontiac Grand Prix suffering from frustrating and unpredictable issues? A faulty Powertrain Control Module (PCM), often called the engine computer, is a common culprit for a wide range of drivability problems. This replacement PCM, part number 12509307, is the definitive solution to get your vehicle running smoothly and reliably again. It arrives at your door pre-programmed with the latest GM software updates, specifically matched to your vehicle’s VIN. This eliminates the need for expensive dealership programming, saving you time and money.
From the Diagnostic Bay
We had a 2008 Buick Lucerne come in with a complaint of harsh, erratic transmission shifting and a persistent check engine light for a solenoid circuit code. The customer had already replaced two transmission solenoids with no change. After confirming the solenoid wiring was intact, we suspected the driver circuit within the PCM. Instead of chasing electrical ghosts, we installed a VIN-programmed replacement PCM. After the quick security relearn, the car shifted perfectly, and the code never returned. It’s a classic case where the root problem wasn’t in the transmission itself, but in the computer that controls it.
Is Your Vehicle Showing Signs of a Failing PCM?
A failing engine computer can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, it’s time to consider your PCM as the source of the problem.
- ✔ Unexplained Check Engine Light (CEL) illumination
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Engine stalling, stumbling, or poor idling
- ✔ A complete no-start condition where the engine cranks but won’t fire
- ✔ Reduced fuel economy and poor engine performance
- ✔ Communication errors with diagnostic scan tools
- ✔ Intermittent issues that seem to have no clear cause
Why Choose a VIN-Programmed 2006-2009 LaCrosse PCM?
The PCM is the brain of your vehicle, managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. A generic, non-programmed module simply will not work. Our service ensures this 2006-2009 LaCrosse PCM is a true direct-fit solution. We take your vehicle’s unique Vehicle Identification Number (VIN) and flash the module with the correct factory software and the most recent updates from General Motors. This process ensures that the computer communicates flawlessly with your car’s other modules, including the anti-theft system (Pass-Key/VATS), transmission, and ABS.
Simple Installation Process
This module is located in the lower part of the air cleaner box, making it accessible for replacement. Once you’ve swapped the hardware, you may need to perform a simple security relearn procedure, which can typically be done without special tools. This often involves a sequence of turning the key on and off, allowing the new PCM to sync with your vehicle’s anti-theft system. This simple step finalizes the installation and gets you back on the road.
Guaranteed Fitment
This electronic control module is a direct replacement for the following vehicles equipped with the 3.8L V6 engine:
- Buick LaCrosse: 2006, 2007, 2008, 2009
- Buick Allure: 2006, 2007, 2008, 2009
- Buick Lucerne: 2006, 2007, 2008
- Pontiac Grand Prix: 2006, 2007, 2008
This part is compatible with and replaces the following part numbers: 12600930, 12616866, 12619810, 12509307. By providing your VIN, you guarantee you receive a module correctly prepared for your specific vehicle options.
Frequently Asked Questions
What does a Powertrain Control Module (PCM) do?
The PCM is your vehicle’s central computer. It controls the critical functions of the engine and transmission by reading data from sensors and sending commands to actuators. This includes managing fuel mixture, spark timing, and automatic gear shifts to ensure optimal performance, fuel efficiency, and emissions control.
Is this part truly plug-and-play?
Because we program the module to your vehicle’s specific VIN, it is as close to plug-and-play as possible. In most cases, the only additional step is a simple security relearn procedure (often called a VATS relearn) which you can do yourself in about 10-15 minutes. This allows the new PCM to recognize your vehicle’s keys.
Where is the PCM located on my 2007 Pontiac Grand Prix?
On the Pontiac Grand Prix, as well as the LaCrosse, Allure, and Lucerne models covered by this part, the PCM is located inside the lower portion of the engine’s air cleaner housing/box. This protects it from excessive heat and vibration.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to load the exact GM-specified software for your car’s engine, transmission, and factory options. This ensures seamless integration and correct operation, preventing compatibility issues that would occur with a non-programmed module.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the original PCM (e.g., faulty sensor drivers, processor errors), then this replacement module will solve the problem. However, if the light is on due to a faulty external sensor or wiring, that separate issue will still need to be addressed.
What are the compatible part numbers for this module?
This module is a direct replacement for several original equipment part numbers, including 12600930, 12616866, 12619810, and 12509307. Ordering this part ensures you get a compatible and correctly programmed unit for your vehicle.