Is Your Buick Lucerne Running Rough? The PCM Might Be the Culprit.
If your 2009, 2010, or 2011 Buick Lucerne with the 3.9L engine is experiencing frustrating issues like stalling, erratic shifting, a persistent check engine light, or a complete no-start condition, the problem may lie with its central command unit: the Powertrain Control Module (PCM). This module, also known as the Engine Control Module (ECM), is the brain of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, it can cause a cascade of problems that are often misdiagnosed, leading to costly and unnecessary repairs.
This replacement PCM, corresponding to service number 12611549, is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork out of the repair by pre-programming the module specifically to your car’s Vehicle Identification Number (VIN). This ensures that all factory settings, security information, and operational parameters are perfectly matched to your Lucerne, making installation as straightforward as possible.
From the Diagnostic Bay
We had a 2010 Buick Lucerne come into the shop with a persistent random misfire code (P0300) and a noticeable hesitation under acceleration. The owner had already spent a small fortune replacing spark plugs, ignition coils, and even a fuel injector. The problem persisted. After hooking up our diagnostic scanner and monitoring live data, we noticed the fuel trim values were erratic and injector pulse widths were inconsistent on several cylinders. This pointed away from a mechanical issue and toward the driver circuit. We inspected the original PCM and found no visible damage, but experience told us the internal injector drivers were failing intermittently. We installed one of our VIN-programmed PCMs, performed the security relearn, and the car ran perfectly. The misfire was gone, and the owner was relieved to finally have a reliable car again after chasing the wrong parts.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various trouble codes (DTCs), especially communication or internal processor fault codes.
- ✔ Engine stalling, stumbling, or hesitating for no apparent reason.
- ✔ Rough or erratic idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ The vehicle won’t start, even with a good battery and starter.
- ✔ Cooling fans running constantly or not at all.
- ✔ Failure to pass an emissions test.
The Plug-and-Play Solution for Your 2009-2011 Lucerne PCM
Replacing a modern vehicle’s computer isn’t as simple as swapping a battery. Each PCM is coded with specific software and security information for the vehicle it came from. Our professional programming service eliminates the need for expensive dealership visits or specialized tools. Simply provide us with your vehicle’s VIN during checkout, and we handle the rest. We flash the module with the latest, most stable software updates directly from GM, which can often resolve issues that were present even when the car was new. This ensures your 2009-2011 Lucerne PCM operates at peak efficiency.
This module is a direct replacement for a wide range of GM vehicles beyond the Buick Lucerne, including models like the Chevrolet Malibu, HHR, Cobalt, Silverado, and Pontiac G6. It is compatible with multiple service numbers, including 12597125, 12612397, 12594750, 12629019, 12635902, and 12611549. By ordering from us, you receive a component that is ready to be installed right out of the box, saving you time, money, and diagnostic headaches.
Frequently Asked Questions
What exactly does the PCM do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It takes data from sensors all over the engine and transmission to control fuel delivery, spark timing, emissions systems, and automatic transmission shift points to ensure the vehicle runs efficiently and smoothly.
Is any additional programming required after I install it?
No. We program the PCM to your vehicle’s specific VIN before shipping. In most cases, the only additional step is a simple security relearn procedure (also known as a key relearn), which you can typically do yourself in about 15-30 minutes without any special tools. Instructions are readily available online for your specific model.
How do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard visible through the windshield.
Will this fix my specific problem or check engine light?
This PCM will resolve any issues directly caused by a faulty module. While a failing PCM is a common cause for many of the symptoms listed, it’s crucial to have your vehicle properly diagnosed. This part will not fix issues related to other faulty sensors or mechanical components.
Where is the PCM located on my 2009-2011 Buick Lucerne?
On the 2009-2011 Buick Lucerne, the PCM is typically located in the lower part of the air cleaner box assembly in the engine bay, making it relatively accessible for replacement.