Is Your Buick or Pontiac Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, unexplained stalling, rough idling, or poor fuel economy in your 2006-2009 Buick LaCrosse, Lucerne, Allure, or Pontiac Grand Prix, the root cause is often a failing Powertrain Control Module (PCM). This component is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting. When it starts to fail, it can create a cascade of problems that are difficult to diagnose and can leave you stranded.
Don’t let a faulty computer dictate your vehicle’s reliability. This direct-replacement PCM, part number 12600930, is the definitive solution to restore your car’s performance and dependability. We take the guesswork and high dealership costs out of the equation. Each module is professionally programmed with the latest GM software updates, specifically tailored to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless communication with all other modules in your car and optimal performance from your 3.8L engine, right out of the box.
From the Diagnostic Bay
We had a 2007 Pontiac Grand Prix come in that was a real head-scratcher. The owner complained of random stalling at stoplights and a harsh 1-2 shift that came and went. There were no consistent trouble codes, just a generic communication error that would pop up occasionally. We checked the wiring, sensors, and even the transmission fluid. Everything looked fine. On a hunch, we monitored the PCM’s data stream and noticed the processor would momentarily drop offline right before a stall. We swapped in one of our pre-programmed modules, performed the security relearn, and the car ran perfectly. It’s a classic example of how a failing PCM can mimic a dozen other problems, and why a reliable, correctly programmed module is the key to a lasting fix.
Symptoms of a Failing 3.8L PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling or shutting off unexpectedly while driving or idling.
- ✔ Rough or erratic idle that you can’t seem to solve.
- ✔ Noticeable decrease in fuel efficiency (MPG).
- ✔ Harsh or delayed transmission shifting.
- ✔ The vehicle enters ‘limp mode’ with reduced power.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Communication errors with diagnostic scan tools.
Why Choose Our Programmed 2006-2009 LaCrosse PCM?
Getting your vehicle back on the road shouldn’t be complicated. Our process is designed for the everyday owner and the professional mechanic alike. Unlike a generic part from a local store, our PCM arrives ready for installation. By programming it to your VIN before shipping, we ensure that it has the correct software and calibrations for your specific vehicle options. This eliminates the need for expensive programming tools or a costly trip to the dealership. This is a true plug-and-play solution that restores factory performance and function. All you need to do is install the part and perform a simple security relearn procedure, which can often be done without any special tools.
Guaranteed Fitment
This Electronic Control Module is a direct replacement for the following vehicles equipped with the 3.8L V6 engine. Please verify the module is located in the lower part of the air cleaner box.
- Buick LaCrosse: 2006, 2007, 2008, 2009
- Buick Allure: 2006, 2007, 2008, 2009
- Buick Lucerne: 2006, 2007, 2008
- Pontiac Grand Prix: 2006, 2007, 2008
Compatible Part Numbers: 12600930, 12616866, 12619810, 12509307
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM), also known as the Engine Control Module (ECM), is your vehicle’s main computer. It controls the engine’s fuel delivery, spark timing, and emissions systems, as well as the transmission’s shifting, to ensure optimal performance, fuel economy, and low emissions.
Is this part difficult to install?
The physical installation is straightforward for anyone with basic mechanical skills. It’s typically located in the air filter housing. After installation, you will need to perform a security relearn procedure (also known as a CASE relearn) so the PCM can communicate with your vehicle’s anti-theft system. Instructions for this procedure are widely available online or in service manuals.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically add it as a note during checkout or send it to us in a message. We cannot ship your part until we receive your VIN, as the programming is specific to your vehicle.
What if my original part number isn’t an exact match?
This module replaces several part numbers, including 12616866, 12619810, and 12509307. As long as your vehicle is listed in our fitment guide and has the 3.8L engine, this module will be the correct replacement, programmed specifically for your car.
Will this fix my check engine light?
If the check engine light and other symptoms are caused by a faulty PCM, this part will resolve the issue. However, it’s always best to have your vehicle properly diagnosed to ensure the PCM is the source of the problem and not a separate sensor or wiring issue.