Is Your Buick Park Avenue Running Rough?
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the electronic brain of your 2003-2004 Buick Park Avenue. It manages everything from fuel injection and ignition timing to transmission shift points and emissions controls. When this critical component begins to fail, it can cause a wide range of frustrating and often mysterious problems that can be difficult to diagnose. If you’re experiencing erratic engine behavior, poor fuel economy, or have a persistent Check Engine Light, a failing PCM could be the culprit.
This replacement Powertrain Control Module, part number 89017735 (also compatible with 12583826), is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN). This ensures that all factory settings, anti-theft systems, and vehicle-specific parameters are correctly loaded, making for a seamless installation process.
Symptoms of a Failing 2003-2004 Park Avenue PCM
A faulty PCM can manifest in numerous ways. If you notice any of the following issues, it’s a strong indicator that your module may need replacement:
- ✔ Check Engine Light: The light is on, and you may have codes related to module communication (U-codes) or multiple, unrelated sensor codes.
- ✔ Erratic Shifting: The transmission may shift harshly, slip between gears, or get stuck in one gear (limp mode).
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, or rough idling.
- ✔ Reduced Fuel Economy: A sudden and unexplained drop in your vehicle’s miles per gallon (MPG).
- ✔ Stalling or No-Start Condition: The engine may stall intermittently while driving or fail to start at all, even with a good battery and starter.
- ✔ Misfire Codes: The PCM may incorrectly report engine misfires due to internal processing errors.
- ✔ Cooling Fans Not Working: The module controls the cooling fan relay, and a failure can lead to overheating.
A Plug-and-Play Solution Programmed for Your Vehicle
Don’t settle for a generic, unprogrammed module that will require expensive dealership tools to initialize. Our process is simple and designed for the DIY mechanic or professional shop. When you purchase this module, you provide us with your VIN. Our technicians then flash the unit with the latest GM-certified software specific to your car. This ensures all systems communicate correctly right out of the box. Once you receive the module, installation is straightforward. In most cases, you will only need to perform a simple security relearn procedure, which can be done without special tools and typically takes about 30 minutes.
Guaranteed Fitment
This module is a direct replacement for service numbers 89017735 and 12583826. It is guaranteed to fit and function correctly in the following vehicles:
- 2003 Buick Park Avenue (LH front engine compartment)
- 2004 Buick Park Avenue (LH front engine compartment, ID 12583826)
- 2003-2004 Buick Regal (LH engine compartment)
- 2003 Buick LeSabre (LH engine compartment, ID 12583826)
- 2003 Chevrolet Impala (3.8L, LH engine compartment, ID 12583826 or 89017735)
- 2003 Chevrolet Monte Carlo (3.8L, LH engine compartment, ID 12583826)
- 2003 Pontiac Bonneville (LH engine compartment, ID 12583826)
- 2003 Pontiac Grand Prix (3.8L, LH front engine compartment, ID 12583826)
Frequently Asked Questions
What is VIN programming and why is it necessary?
VIN programming loads your vehicle’s specific software and security information onto the PCM. Without it, the module won’t be able to communicate with other components like the instrument cluster or anti-theft system, and your vehicle will not start or run correctly. We handle this for you before shipping.
Where do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit VIN. We cannot ship your order until we receive this information, as the programming is a critical part of the process.
Is this part difficult to install?
The physical installation is straightforward for someone with basic mechanical skills. It’s typically located in the engine bay, secured by a few bolts and electrical connectors. After installation, you will need to perform a security relearn procedure, which we can provide instructions for.
Will I need to have a dealer do anything after I install it?
No. Because we pre-program the module to your VIN, you avoid a costly trip to the dealership. The only post-installation step is the security relearn, which you can do yourself.
What is a security relearn procedure?
It’s a simple process that syncs the new PCM with your vehicle’s anti-theft system and keys. It usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this sequence three times. We provide detailed instructions.