Restore Your Vehicle’s Performance and Reliability
Is your Buick LaCrosse, Lucerne, or Pontiac Grand Prix suffering from frustrating and unpredictable engine problems? Issues like a persistent Check Engine Light, poor fuel economy, stalling, or rough shifting can often be traced back to a failing Powertrain Control Module (PCM). This component is the brain of your vehicle, and when it malfunctions, it can cause a cascade of issues that are difficult to diagnose. This listing is for a direct-fit replacement PCM, part number 12600930 (also compatible with 12616866, 12619810, and 12509307), specifically for GM vehicles equipped with the venerable 3.8L engine.
The biggest challenge with replacing a PCM isn’t finding the part; it’s getting it programmed. A trip to the dealership can be costly and time-consuming. We eliminate that hassle completely. Before we ship your part, we will flash it with the latest GM-certified software updates and program it specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures that when you receive it, it’s ready for installation, communicates correctly with your car’s other modules, and restores the original factory performance and emissions standards.
From the Diagnostic Bay
We had a 2008 Buick Lucerne come into the shop with a classic complaint: intermittent stalling at red lights and a P0601 ‘Internal Control Module Memory Check Sum Error’ code. The owner had already spent a small fortune replacing the crankshaft position sensor and the mass air flow sensor at another shop, with no success. The problem was that while those sensors can cause stalling, the P0601 code is almost always a definitive sign of internal PCM failure. The module’s internal processor was failing its self-check. We installed one of our VIN-programmed PCMs, performed the quick 10-minute security relearn procedure, and the car ran perfectly. It’s a powerful reminder that correctly identifying the root cause saves time, money, and a lot of frustration.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with communication or internal processor codes (e.g., P0601, P0606).
- ✔ Unexplained drop in fuel efficiency.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or erratic idling.
- ✔ Harsh or delayed automatic transmission shifts.
- ✔ The vehicle cranks but refuses to start.
- ✔ Inconsistent or non-functional gauges on the instrument cluster.
The Solution: A Pre-Programmed 2006-2009 LaCrosse PCM
Choosing our pre-programmed 2006-2009 LaCrosse PCM is the most efficient and reliable way to solve these complex electronic issues. By programming the module to your VIN, we ensure all the specific options and parameters for your vehicle are correctly loaded. This includes everything from the tire size and gear ratios to the anti-theft system data, creating a seamless integration. The module is located in the lower part of the air cleaner box, making it accessible for a straightforward replacement. Once installed, a simple security relearn procedure is typically all that’s needed to sync the new computer with your keys and get you back on the road.
Guaranteed Fitment for 3.8L Engines:
This Electronic Control Module is a direct replacement for the following vehicles:
- Buick LaCrosse: 2006, 2007, 2008, 2009 (3.8L Engine)
- Buick Allure: 2006, 2007, 2008, 2009 (3.8L Engine)
- Buick Lucerne: 2006, 2007, 2008 (3.8L Engine)
- Pontiac Grand Prix: 2006, 2007, 2008 (3.8L Engine)
Frequently Asked Questions
Do I need to get this computer programmed?
No. The main benefit of our service is that we program the module for you before it ships. Simply provide us with your vehicle’s VIN during or after checkout, and we’ll handle the complex flashing process. It will arrive ready to be installed.
What is a ‘security relearn’ and is it difficult?
A security relearn, or key relearn, is a simple procedure required on most GM vehicles to sync the new PCM with your car’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. No special tools are needed, and we can provide instructions.
Where is the PCM located on my 2007 Buick LaCrosse?
On the LaCrosse, Allure, Lucerne, and Grand Prix models covered by this part, the PCM is conveniently located in the lower portion of the engine’s air cleaner housing/box. This makes it relatively easy to access and replace.
Will this fix my car’s specific problem?
If your vehicle’s issues are caused by a faulty PCM, this part is the correct solution. It’s crucial to have the vehicle properly diagnosed to confirm the PCM is the point of failure. This module will resolve issues like internal processor faults (P0601-P0606) and other PCM-related drivability problems.
How do I provide my VIN?
You can enter your 17-digit VIN in the order notes section during checkout. If you forget, we will contact you via email after your purchase to request the information before we can program and ship your module.
Are these part numbers interchangeable?
Yes. Part numbers 12600930, 12616866, 12619810, and 12509307 are all hardware-compatible. We will load the correct software for your specific vehicle based on the VIN you provide, ensuring perfect function regardless of the number on the case.