Restore the Smooth, Powerful Performance of Your Cadillac
Is your Cadillac Seville, DeVille, or Pontiac Bonneville suffering from frustrating and unpredictable issues like stalling, rough idling, poor fuel economy, or a persistent check engine light? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. Don’t let a faulty computer compromise the sophisticated driving experience you expect. This genuine GM PCM, service number 12587465, is the definitive, reliable solution to get your vehicle running perfectly again.
We take the guesswork and high dealership costs out of the equation. Before we ship, our expert technicians will program this module with the latest GM software updates, flashed specifically to your vehicle’s unique VIN. This ensures a seamless, plug-and-play installation process, restoring your car’s factory-specified performance and efficiency.
Common Symptoms & Your Direct Solution
A failing PCM can cause a wide range of problems that are often misdiagnosed. If you’re experiencing any of the following, this pre-programmed module is your solution:
- Unexplained Check Engine Light with codes like P0601, P0603, P0605
- Engine stalling or shutting off while driving
- Rough or erratic engine idle
- Harsh or incorrect transmission shifting
- Noticeable decrease in fuel efficiency
- Vehicle won’t start, even with a good battery and starter
Instead of struggling with ongoing issues, install this professionally prepared 2004 Cadillac Seville PCM to permanently resolve these problems and restore your confidence on the road.
Features & Benefits
- ✔ Plug-and-Play Ready: Arrives pre-programmed to your vehicle’s VIN. No expensive trip to the dealer for additional flashing is required.
- ✔ Optimized Performance: Flashed with the newest stable software updates from General Motors to enhance engine and transmission performance.
- ✔ Genuine OEM Quality: This is a used, genuine GM part, ensuring perfect compatibility and communication with your vehicle’s other electronic modules.
- ✔ Cost-Effective Solution: Get the correct part, professionally programmed, at a fraction of the cost of a new unit from a dealership.
- ✔ Purchase with Confidence: This unit is backed by our one-year replacement warranty.
An Expert’s Note on the Northstar V8
As a technician with over two decades of experience, I can tell you the 4.6L Northstar engine is a masterpiece of engineering that demands precise electronic control. Its performance, fuel delivery, and complex internal systems are all orchestrated by the PCM. When this module falters, the entire system suffers. Using a properly programmed, genuine GM 2004 Cadillac Seville PCM isn’t just a repair; it’s a restoration of the vehicle’s intended character. It ensures all parameters are exactly as the GM engineers designed, which is critical for the longevity and smooth operation of these specific luxury sedans.
Frequently Asked Questions
What information do you need from me?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot program and ship the module without it.
Do I need to program this computer myself?
No. This PCM comes fully programmed to your VIN and is ready for installation right out of the box. In some cases, a security or CASE relearn procedure may be required after installation, which can be done by a qualified technician.
Where can I find my VIN?
Your VIN can be found on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this a new part?
No, this is a thoroughly inspected and tested used part that was sourced from a salvaged vehicle. This ensures you get a genuine OEM component with proven reliability at an excellent value.
Will this fit my car if my old part number is different?
This module, service number 12587465, is a direct replacement for several other service numbers, including 12586547 and 15576920. Please check the fitment list to confirm it is compatible with your specific year, make, and model.
What makes this better than just buying a used part from a yard?
A standard used part will not work in your vehicle because it is programmed to the original car’s VIN and security settings. Our service includes sourcing a quality part AND professionally programming it with the latest software for your specific vehicle, making it a true plug-and-play solution.