Restore Peak Performance to Your Buick Lucerne
Is your 2009, 2010, or 2011 Buick Lucerne suffering from perplexing engine issues, a persistent check engine light, or inconsistent performance? The Powertrain Control Module (PCM), the central computer of your vehicle, is often the source of these frustrating problems. This replacement PCM, part number 12635901, is the definitive solution to restore your vehicle’s drivability, fuel efficiency, and reliability. It arrives at your door pre-programmed with the latest GM software updates, tailored specifically to your car’s Vehicle Identification Number (VIN). This eliminates the need for an expensive trip to the dealership for programming, saving you time and money.
From the Diagnostic Bay
We had a 2010 Lucerne with the 3.9L V6 come in with what the owner described as a ‘slipping transmission.’ The shifts were harsh and unpredictable. All the transmission diagnostics came back clean, which was puzzling. On a hunch, we monitored the data stream from the PCM to the Transmission Control Module (TCM). We discovered the PCM was sending erratic signals, causing the transmission to behave incorrectly. We installed a VIN-programmed PCM, and the car drove like new. It’s a classic case of the vehicle’s ‘brain’ causing symptoms that appear to be a major mechanical failure.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is illuminated with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
Easy Installation for Your 2009-2011 Lucerne PCM
This module is a direct-fit replacement for the original unit in your Buick Lucerne, typically located in the lower part of the air cleaner box. The process is straightforward: simply provide us with your VIN upon purchase, and we handle the complex programming. Once you receive the part, you can install it and get your vehicle back on the road. This plug-and-play solution ensures that all engine and transmission parameters are set correctly for your specific vehicle, restoring the smooth and reliable operation you expect from your Buick.
This versatile module is also a direct replacement for several other service numbers, including 12597125, 12612397, 12594750, 12629019, 12635902, and 12611549. It fits a wide range of GM vehicles beyond the Lucerne, such as the Chevrolet Silverado, Malibu, Cobalt, HHR, Impala, GMC Sierra, Pontiac G6, Solstice, and Saturn Aura, among others. Please verify the part number to ensure compatibility.
Frequently Asked Questions
Do I need to have this PCM programmed?
No. This PCM comes fully programmed to your vehicle’s specific VIN before it is shipped. It is ready for installation right out of the box, with no need for a trip to the dealer.
How do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We will provide clear instructions on how to do this. We cannot ship the module until we have programmed it with your VIN.
Is any additional setup required after installation?
In some cases, a security relearn or crank variation relearn procedure may be necessary after installation. These are simple procedures that can often be done without special tools. Instructions can typically be found online or in a service manual.
Will this fix my car’s specific problem?
A failing PCM can cause a wide range of symptoms. While this part will resolve issues directly caused by a faulty module, it’s essential to ensure your vehicle has been properly diagnosed. This part will not fix problems related to other faulty sensors or mechanical components.
Where is the PCM located on my 2009-2011 Lucerne?
On the Buick Lucerne with the 3.9L engine, the Electronic Control Module (PCM) is typically found attached to the lower part of the air cleaner box assembly in the engine compartment.