Restore Peak Performance to Your GM 3.8L Engine
Is your Buick LaCrosse, Lucerne, or Pontiac Grand Prix suffering from perplexing issues like stalling, poor fuel economy, a persistent check engine light, or a no-start condition? These are common indicators of a failing Powertrain Control Module (PCM), the central computer responsible for managing your vehicle’s engine and transmission. This replacement PCM, part number 12616866, is the definitive solution to restore your vehicle’s reliability and drivability. It arrives programmed to your specific Vehicle Identification Number (VIN), ensuring a seamless installation and proper communication with all other vehicle systems.
From the Diagnostic Bay
We had a 2007 Buick Lucerne come in with a wild goose chase of a problem. The customer complained of intermittent stalling at stoplights and a check engine light with codes for the throttle position sensor and an O2 sensor. They had already replaced both sensors twice with no luck. After hooking up our scanner and monitoring live data, we noticed the 5-volt reference signal to the sensors was dropping out randomly. Instead of just throwing more parts at it, we traced the wiring back to the PCM. A quick tap on the PCM housing caused the engine to stumble. The internal circuitry was failing, causing the reference voltage to fluctuate and triggering false sensor codes. Installing a VIN-programmed PCM like this one solved all the issues in one shot, saving the customer from further frustration and unnecessary expense.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle entering ‘limp mode’ with reduced power.
- ✔ Complete no-start or intermittent starting problems.
- ✔ Failure to pass emissions testing.
Why Choose a VIN-Programmed 2006-2009 LaCrosse PCM?
The PCM is not a one-size-fits-all component. It contains specific software tailored to your vehicle’s engine, transmission, and factory options. Our process eliminates the guesswork and the need for expensive dealership programming. We flash the module with the latest GM-certified software updates using your vehicle’s VIN. This ensures that all parameters are set correctly for your exact build, addressing potential software bugs from the original factory programming and optimizing performance and efficiency. This is a direct-fit replacement for original part numbers 12600930, 12616866, 12619810, and 12509307.
Vehicle Fitment Information
This Powertrain Control Module is a direct replacement for the following vehicles equipped with the 3.8L V6 engine. The module is typically located in the lower part of the air cleaner box/housing.
- Buick LaCrosse: 2006, 2007, 2008, 2009
- Buick Allure: 2006, 2007, 2008, 2009
- Buick Lucerne: 2006, 2007, 2008
- Pontiac Grand Prix: 2006, 2007, 2008
Installation Process
After you place your order, you must provide us with your vehicle’s 17-digit VIN. We will program the module before shipping it to you. Physical installation is straightforward for a competent DIY mechanic. After installing the module, you will need to perform a security relearn procedure (also known as a Passlock or anti-theft relearn) to sync the new PCM with your vehicle’s keys. This procedure can typically be done without special tools and instructions are widely available online or in service manuals.
Frequently Asked Questions
Do I need to have this PCM programmed?
No. We handle all the programming for you before shipment. Simply provide your VIN during or after checkout, and the module will arrive ready for installation and a security relearn.
Where is the PCM located on my 2008 Grand Prix?
On the Pontiac Grand Prix, Buick LaCrosse, and other compatible models, the PCM is located inside the lower portion of the engine’s air cleaner housing.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. It’s crucial to properly diagnose the root cause of the light, as it could also be due to a bad sensor or wiring problem.
What is a security relearn procedure?
It’s a simple process that syncs the new PCM to your vehicle’s anti-theft system and keys. It usually involves a sequence of turning the key to the ‘ON’ and ‘OFF’ positions for specific time intervals. The procedure takes about 30 minutes to complete.
Is this compatible with part number 12600930?
Yes, this module is a direct replacement for several part numbers, including 12600930, 12616866, 12619810, and 12509307. We program it to function perfectly for your specific vehicle.