Restore Your Buick’s Smooth, Reliable Performance
Is your Buick Park Avenue, Impala, or Grand Prix suffering from a persistent Check Engine Light, rough idling, or unpredictable stalling? These frustrating issues often point directly to a failing Powertrain Control Module (PCM). Don’t let a faulty computer keep you off the road or force you into an expensive dealership visit. This is the direct, reliable solution you need. We provide a professionally programmed 2004-2005 Park Avenue PCM, flashed with the latest official GM software and tailored specifically to your vehicle’s VIN. This ensures perfect communication between your engine and transmission, restoring the smooth operation and dependability you expect from your car.
Common Symptoms & Your Direct Solution
A failing PCM can cause a wide range of confusing problems. If you’re experiencing any of the following, this module is your solution:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0605, or P0606
- Engine stalling or cutting out unexpectedly
- Rough or erratic idling
- Poor fuel economy
- Failure to pass an emissions test
- Harsh or incorrect shifting
- Complete no-start condition
Instead of wrestling with a used module from a junkyard that requires expensive programming, our service simplifies the entire process. We handle the critical programming for you before we ship, making this the most efficient way to solve your vehicle’s electronic issues. This is the definitive fix for a faulty original 2004-2005 Park Avenue PCM.
Features & Benefits
- ✔ VIN-Specific Programming: We flash the module with your vehicle’s exact VIN, ensuring it works perfectly with your car’s specific options and security systems right out of the box.
- ✔ Latest GM Software: Your module arrives with the newest updates from General Motors, often improving performance and fixing issues the original software may have had.
- ✔ Plug & Drive Installation: Simply disconnect your old module and connect this one. In most cases, no further programming is required, saving you time and money.
- ✔ Cost-Effective Solution: Get a fully functional, programmed module for a fraction of the cost of a new unit from a dealership.
- ✔ Broad Compatibility: This module is a direct replacement for part numbers 12583826 and 12583827, fitting a wide range of GM vehicles (see full list below).
- ✔ Peace of Mind Protection: This unit is backed by our one-year replacement warranty.
An Expert’s Note on VIN Programming
As a technician with over 20 years of experience, I can’t stress this enough: VIN programming is not optional, it’s essential. In the past, you could swap computers between similar cars. Today, that’s impossible. The PCM is the brain of your car, linked directly to the anti-theft system (PassLock/PassKey), transmission, and even body control features. A mismatched or unprogrammed module will, at best, not allow the car to start, and at worst, can cause damage to other components. By programming this 2004-2005 Park Avenue PCM to your VIN before shipping, we eliminate all the guesswork and potential headaches, giving you a part that is truly ready for installation.
Frequently Asked Questions
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it. You can typically find your VIN on your vehicle’s registration, insurance card, or on a placard on the driver’s side dashboard visible through the windshield.
Is any other programming needed after I install it?
In most cases, no. Our VIN programming handles the primary functions. However, some GM vehicles may require a simple, 10-30 minute security relearn procedure that you can do yourself with just the ignition key. This syncs the module to your car’s anti-theft system. We can provide instructions for this straightforward process.
How can I be sure my old PCM is the problem?
While the symptoms listed above are strong indicators, it’s always best to have a proper diagnosis performed by a qualified mechanic. Common trouble codes like P0601 (Internal Control Module Memory Check Sum Error) are a definitive sign of internal PCM failure.
Will this fit vehicles other than the Park Avenue?
Yes, absolutely. This module is compatible with a wide range of GM models from 2003-2005, including the Impala, Monte Carlo, Grand Prix, Century, Rendezvous, Aztek, and various minivans. Please check the detailed fitment list on this page to confirm compatibility with your specific vehicle and options.
What is covered by the warranty?
This unit is backed by our one-year replacement warranty. This covers the module against failure or defects for one year from the date of purchase. If the module fails within this period, we will provide a replacement unit.