Is Your Buick or Pontiac Running Rough? Get Back on the Road Fast.
A persistent check engine light, poor fuel economy, or an engine that just won’t start can be incredibly frustrating. These aren’t just annoyances; they’re signs that your vehicle’s brain—the Powertrain Control Module (PCM)—may be failing. When the central computer of your car is on the fritz, it can cause a cascade of problems that leave you stranded and stressed. This isn’t just a part; it’s the solution to restoring the dependable performance you rely on for your daily commute and family trips.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues in your 3.8L GM vehicle, a failing PCM is a likely culprit. This module is the definitive fix for problems such as:
- Erratic or harsh transmission shifting
- Engine stalling, stumbling, or misfiring
- Complete no-start condition (engine cranks but won’t fire)
- Illuminated Check Engine Light with communication-related Diagnostic Trouble Codes (DTCs) like U0100, P0601, P0605, or P0606
- Poor acceleration and reduced engine power
- Inaccurate or non-functioning dashboard gauges
Our Programmed 12616866 PCM arrives ready to install. We take the guesswork and expensive dealer visits out of the equation by pre-flashing the unit with the latest GM-certified software, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures perfect communication between all your car’s modules and a seamless installation process.
Features & Tangible Benefits
- ✔ VIN-Specific Programming: We flash the module to your exact VIN before shipping. This means no extra programming is needed—it’s a true plug-and-play solution that saves you time and a costly trip to the dealership.
- ✔ Latest GM Software Updates: Your PCM comes loaded with the newest factory software, which often corrects original bugs, improves transmission shift points, and can even enhance fuel efficiency.
- ✔ Direct-Fit Replacement: This unit is a direct replacement for part numbers 12600930, 12616866, 12619810, and 12509307, guaranteeing a perfect fit in the factory location (typically in the lower air cleaner box).
- ✔ Restored Drivability: Eliminate frustrating performance issues and enjoy the smooth, reliable operation you remember from your vehicle.
- ✔ Cost-Effective Repair: Avoid the high costs of a new part and programming services at a dealership. This is the smart, efficient way to fix your car correctly.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty. Drive with confidence knowing you’re covered.
Expert Mechanic’s Insight
“Over my 20 years in the shop, I’ve seen countless drivers replace part after part trying to chase down an electrical gremlin. Often, the root cause is the PCM itself. What makes this Programmed 12616866 PCM such a game-changer is the pre-flashing service. In the past, you’d install a ‘blank’ computer and have to get the vehicle towed to a dealer for expensive programming. This solution eliminates that entire step. It arrives ready to go, loaded with software that’s often better than what the car had from the factory, fixing drivability issues the owner just learned to live with. It’s the most reliable way to get the job done right the first time.”
Complete Vehicle Fitment:
This module is compatible with the following vehicles equipped with the 3.8L V6 engine:
- Buick Allure: 2006, 2007, 2008, 2009
- Buick LaCrosse: 2006, 2007, 2008, 2009
- Buick Lucerne: 2006, 2007, 2008
- Pontiac Grand Prix: 2006, 2007, 2008
Stop letting a faulty computer dictate your car’s performance. Ordering this Programmed 12616866 PCM is the first step toward a reliable, smooth-running vehicle and the peace of mind that comes with it.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is essential for the part to function in your vehicle.
Will I need to do anything else after installation?
In most cases, no. Because the unit is pre-programmed, it is designed for a straightforward installation. However, some vehicles may require a security relearn procedure (often called a CASE relearn or anti-theft relearn), which can typically be done without special tools. Instructions for this are widely available online for your specific model.
Where is the PCM located on my vehicle?
On these specific models (LaCrosse, Grand Prix, Lucerne, Allure), the PCM is conveniently located in the lower part of the air cleaner box/housing in the engine bay. This makes it relatively easy to access for replacement.
Is this part difficult to install?
For someone with basic mechanical skills and tools, this is a very manageable job. It typically involves disconnecting the battery, removing the air cleaner box, unplugging the electrical connectors from the old PCM, and swapping in the new one. We always recommend consulting a repair manual or online tutorial for your specific vehicle if you are unsure.
What if my original part has a different number?
This module is a direct replacement for several part numbers, including 12600930, 12616866, 12619810, and 12509307. As long as your vehicle is listed in our fitment chart, this unit will work correctly once programmed to your VIN.