Restore Peak Performance to Your Buick Lucerne
If you’re experiencing frustrating engine problems with your 2009, 2010, or 2011 Buick Lucerne, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your vehicle’s engine, the PCM controls everything from fuel mixture and ignition timing to transmission shifting and emissions. When it starts to fail, you’ll notice a significant decline in performance, fuel economy, and overall reliability. This replacement engine computer, service number 12597125, is the definitive solution to get your vehicle back on the road and running like new.
We take the guesswork and hassle out of the replacement process. Unlike a generic module from a dealership or parts store, this unit comes pre-programmed specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) during checkout, and our technicians will flash the module with the latest, most up-to-date software directly from GM. This ensures a seamless, plug-and-play installation with no need for an expensive trip to the dealer for programming.
Is a Failing 2009-2011 Lucerne PCM Causing Your Issues?
A faulty engine computer can manifest in numerous ways, often mimicking other component failures. Before you spend hundreds on sensors and other parts, check if your vehicle is exhibiting any of the classic signs of PCM failure. Proper diagnosis is key to avoiding unnecessary repairs and getting straight to the source of the problem.
From the Diagnostic Bay
We had a 2010 Lucerne 3.9L come into the shop with a persistent P0300 Random Misfire code. The owner had already replaced all the spark plugs, wires, and the ignition coil pack, but the check engine light and rough idle always returned. After confirming fuel pressure and checking for vacuum leaks, we hooked up our scope to the injector and coil control wires. We noticed the signal from the PCM was erratic on two cylinders. Instead of a clean on/off signal, it was noisy and inconsistent. A new, properly programmed PCM fixed the issue instantly. The customer had spent nearly $500 on parts they didn’t need, when the root cause was the computer all along.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various codes
- ✔ Engine stalling or shutting off while driving
- ✔ Rough idling or misfires
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass state emissions testing
- ✔ Communication errors with diagnostic scan tools
This module is a direct replacement for part number 12629020 and is compatible with a wide range of GM vehicles, ensuring OEM-level quality and fitment. It interchanges with several service numbers including 12612397, 12594750, 12597125, 12629019, 12635902, and 12611549. By ordering from us, you’re not just getting a part; you’re getting a fully prepared, vehicle-specific solution designed to restore the precise engine management your vehicle requires. Don’t let a faulty computer keep your car off the road. Order today and experience the difference a correctly programmed PCM makes.
Frequently Asked Questions
Do I need to get this computer programmed by a dealer?
No. We program the computer to your vehicle’s specific VIN before we ship it to you. This means it will be ready for installation right out of the box, with no additional programming required in most cases.
What information do you need from me?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) to program the module correctly. Please provide your VIN at checkout or send it to us via email after placing your order to avoid delays.
Is any other procedure required after installation?
In some GM vehicles, a security relearn procedure (also known as a CASE relearn) may be necessary after installation. This is a simple procedure that can typically be done without special tools and involves a sequence of key turns. Instructions are widely available online for your specific model.
How do I know if this part number will fit my vehicle?
This module fits 2009-2011 Buick Lucerne models with the 3.9L engine. It also replaces a wide variety of other GM part numbers. The best way to ensure compatibility is to match one of the service numbers listed in the description (like 12597125, 12629019, etc.) to the one on your original computer.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. A PCM is an ECM that also controls the transmission and other powertrain functions. For your Lucerne, this unit functions as the PCM, managing both engine and transmission.