Restore Peak Performance to Your Buick Lucerne
Is your 2009-2011 Buick Lucerne suffering from frustrating issues like a persistent check engine light, erratic engine behavior, stalling, or a complete no-start condition? The Powertrain Control Module (PCM), your vehicle’s central computer, is often the culprit. I’ve seen it countless times in the shop: a perfectly good engine held back by a failing electronic brain. This replacement PCM, service number 12629019, is the reliable, cost-effective solution to get your car running smoothly again.
The biggest headache with replacing a PCM is the need for expensive dealership programming. We eliminate that problem entirely. Before this module ships, we flash it with the latest official GM software, precisely matched to your vehicle’s 17-digit VIN. This ensures all engine and transmission parameters are correct, restoring the factory-intended fuel efficiency, shifting patterns, and performance. You get a component that’s ready for installation right out of the box, saving you time and hundreds of dollars in programming fees.
A Technician’s Notebook
A customer brought in their 2010 Lucerne 3.9L with an intermittent no-start and a check engine light that would come and go. Their local mechanic had already replaced the battery and checked the alternator. When I connected my scan tool, I pulled a P0601 code – Internal Control Module Memory Check Sum Error. This is a classic sign of internal PCM failure. Instead of a costly trip to the dealer, we ordered one of these VIN-programmed modules. The installation was straightforward, and after a simple security relearn procedure, the car started every time. The check engine light was gone for good, and the customer was thrilled to have their reliable car back without the massive dealership bill.
Common Signs of a Failing PCM
If you’re experiencing any of the following, a faulty engine computer could be the cause. A proper diagnosis is key, but these are tell-tale symptoms I regularly see linked to PCM failure:
- ✔ Check Engine Light is illuminated (with codes like P0601, P0606, or U0100)
- ✔ Engine cranks but refuses to start
- ✔ Unexplained drop in fuel economy
- ✔ Rough or unpredictable idling
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Vehicle stalls unexpectedly while driving
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
For the 2009-2011 Buick Lucerne, the PCM is conveniently located in the lower part of the air cleaner box, making it one of the more accessible modules to replace. While professional installation is always an option, a confident DIYer can handle this job.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system to fully discharge.
- Locate the Module: Open the hood and find the air cleaner assembly. The PCM is situated in the lower section of this housing.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old PCM. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting position.
- Install the New PCM: Mount your new, pre-programmed PCM in the exact same position and securely fasten it. Reconnect the electrical harnesses, ensuring they click firmly into place.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Security Relearn: Most GM vehicles require a simple key-cycle procedure to sync the new PCM with the anti-theft system. This usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This PCM is a direct replacement for service number 12629019 and is guaranteed to function correctly in the following primary application:
- Buick Lucerne (2009-2011) with 3.9L Engine
It also replaces a wide range of other GM part numbers (including 12597125, 12612397, 12594750, 12635902, 12611549) and fits an extensive list of vehicles. Please verify your original part number or contact us with your VIN to confirm compatibility. Other applications include:
- Chevrolet Silverado & GMC Sierra 1500 (2007-2009) w/ 4.3L
- Chevrolet Malibu (2007-2012) w/ 2.2L, 2.4L, or 3.5L
- Chevrolet Cobalt & Pontiac G5 (2007-2010) w/ 2.2L or 2.4L
- Chevrolet HHR (2007-2011) w/ 2.2L or 2.4L
- Chevrolet Impala (2010-2011)
- Chevrolet Express & GMC Savana 1500 (2008-2009) w/ 4.3L
- Pontiac G6 (2008-2010) w/ 2.4L
- Pontiac Solstice & Saturn Sky (2008-2010) w/ 2.4L
- Saturn Aura (2008-2009) w/ 2.4L
- Saturn Vue (2008-2010) w/ 2.4L
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. We handle the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during checkout, and it will arrive ready to install with the latest GM software.
What is a security relearn procedure?
It’s a simple process that syncs the new PCM to your car’s anti-theft system. It typically involves a sequence of key turns and waiting periods and does not require any special tools. This is a mandatory step for the vehicle to start after installation.
Where is the PCM on my 2009 Lucerne?
The PCM is located within the lower portion of the engine’s air cleaner box assembly in the engine bay.
What information do you need from me?
After you place your order, we will need the 17-digit Vehicle Identification Number (VIN) from your car. You can find this on your dashboard (visible through the windshield) or on the driver’s side door jamb sticker.
Will this part fix my check engine light?
If a faulty PCM is the confirmed source of the check engine light (diagnosed with codes like P0601, P0606, etc.), then yes, this replacement part will resolve the issue and allow the light to be cleared.