Is Your Buick or Pontiac Running Poorly?
If you’re experiencing frustrating issues like a persistent check engine light, sudden stalling, rough idling, or a no-start condition in your 2006-2009 Buick Allure, LaCrosse, Lucerne, or Pontiac Grand Prix, the root cause is often a failing Powertrain Control Module (PCM). As the central computer for your engine, the PCM is responsible for managing everything from fuel mixture and ignition timing to transmission shifting. When it begins to fail, it can cause a wide range of performance problems that can make your vehicle unreliable and unsafe to drive.
Don’t let a faulty computer keep you off the road. This is a direct replacement PCM, part number 12619810 (and compatible with 12600930, 12616866, 12509307), that arrives at your door fully programmed for your specific vehicle. We take the guesswork out of the repair by using your Vehicle Identification Number (VIN) to load the latest, most stable GM factory software onto the module before we ship it. This ensures a seamless installation process and restores your vehicle’s original performance and reliability.
We once had a 2007 Pontiac Grand Prix towed in that wouldn’t start. The owner had replaced the PCM with one from a salvage yard, thinking it was a simple swap. He spent an entire weekend checking for fuel and spark, completely stumped. The problem wasn’t the module itself, but the data on it. The junkyard PCM’s security information didn’t match the car’s Body Control Module, triggering the anti-theft system and preventing it from starting. A properly programmed module, like this one, would have started the car after a simple security relearn, saving him a tow bill and a massive headache.
Common Symptoms of a Failing 3.8L PCM
- ✔ Persistent Check Engine Light: The module may set false trouble codes or fail to communicate with diagnostic scanners.
- ✔ Engine Stalling or Misfiring: The PCM may intermittently lose control of spark or fuel injection, causing the engine to run rough or shut off completely.
- ✔ Poor Fuel Economy: Incorrect sensor readings or calculations can lead to an overly rich or lean fuel mixture, drastically reducing your MPG.
- ✔ No-Start Condition: The module may fail to activate the fuel pump or ignition coils, preventing the engine from starting at all.
- ✔ Erratic Transmission Shifting: The PCM works with the transmission controller; a fault can cause harsh shifts, delayed engagement, or getting stuck in one gear.
- ✔ Failed Emissions Test: A malfunctioning PCM can prevent the vehicle’s emissions systems from operating correctly, leading to an automatic failure.
Why Choose a Pre-Programmed 2006-2009 Buick Allure PCM?
In modern vehicles, the PCM is more than just a part—it’s the brain, uniquely tied to your car’s specific hardware and options through the VIN. Simply installing a used, unprogrammed module will not work. Our service eliminates the need for an expensive trip to the dealership for programming. We handle the complex part for you. By providing your VIN during checkout, you receive a unit that is ready for installation. It’s loaded with the correct software for your engine, transmission, and emissions equipment, ensuring all systems function exactly as the manufacturer intended.
Simple Installation Process
This module is located in the lower part of the air cleaner box, making it accessible for a straightforward replacement. Once you’ve swapped the hardware, you will likely need to perform a simple security relearn procedure, also known as a “key-on” relearn. This process syncs the new module with your vehicle’s anti-theft system and typically involves a series of key cycles that can be done in your driveway without any special tools. Instructions are readily available online for this common procedure.
Guaranteed Vehicle Compatibility
This electronic control module is a direct fit for the following vehicles equipped with the 3.8L engine:
- 2006-2009 Buick Allure
- 2006-2009 Buick LaCrosse
- 2006-2008 Buick Lucerne
- 2006-2008 Pontiac Grand Prix
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the module with the exact factory software for your car’s specific engine, transmission, and options. This ensures perfect compatibility and a true plug-and-play installation.
Is this part difficult to install?
The physical replacement is straightforward for someone with basic mechanical skills, as the module is located in the air cleaner housing. The only additional step is a simple security relearn procedure which does not require special tools.
Will I need to do anything after installation?
Yes, you will need to perform a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times.
What part numbers does this module replace?
This module, 12619810, is a direct replacement and is also compatible with part numbers 12600930, 12616866, and 12509307.
How do I know for sure that my PCM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a professional diagnosis. Common checks include verifying power and ground at the PCM connector and checking for communication with a scan tool. If the module is not communicating, it’s a very likely culprit.