Restore Your Cadillac’s Smooth Performance
Is your Cadillac Seville, DeVille, or Pontiac Bonneville suffering from frustrating and unpredictable issues? A persistent check engine light, rough idling, stalling, or erratic shifting can ruin the driving experience of these classic luxury sedans. These are hallmark signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. This pre-programmed engine computer is the definitive, hassle-free solution to restore the power, reliability, and smooth operation you’ve been missing.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty PCM is the most likely culprit. This unit is designed to be the direct solution for:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) like P0601, P0602, P0606
- Engine Stalling or Misfiring
- Poor Fuel Economy
- Harsh or Failed Transmission Shifting
- Vehicle Won’t Start (No-Crank or Crank-No-Start)
- Failed Emissions Test
Instead of struggling with a malfunctioning vehicle, you can install this fully programmed 2004 Cadillac Seville PCM and get your car back to factory specifications. We take care of all the complex programming, so you don’t have to.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash this computer with the latest GM software updates using your specific Vehicle Identification Number (VIN). This ensures perfect compatibility and communication with your car’s other modules.
- ✔ Plug-and-Play Installation: Because all the programming is done beforehand, this unit is ready to install right out of the box. No expensive trips to the dealership for flashing are required.
- ✔ Cost-Effective OEM Quality: Get the reliability of an original equipment part without the high cost of a new unit. This computer is a tested component sourced from a salvaged vehicle, providing a dependable and affordable repair.
- ✔ Broad Compatibility: This module is a direct replacement for service numbers 12587465, 12586547, and 15576920, covering the 2004 Seville, 2004-2005 DeVille, and 2004-2005 Bonneville with the 4.6L engine.
- ✔ One-Year Coverage: This unit is backed by our one-year replacement warranty., giving you confidence in your purchase.
An Expert’s Note on VIN Programming
Many people wonder if they can just grab a computer from a junkyard and plug it in. For modern vehicles like your Cadillac, the answer is a firm ‘no.’ The PCM is tied directly to the car’s anti-theft system (VATS/Passlock) and has specific fuel and transmission calibrations. Our VIN programming service isn’t just a convenience; it’s a necessity. We ensure the security handshake is correct and the software is perfectly matched, which is why our units work flawlessly upon installation while a generic one will leave your car immobilized.
By choosing this programmed 2004 Cadillac Seville PCM, you’re not just buying a part; you’re investing in a reliable, professionally prepared solution that brings your vehicle back to life. Experience the peace of mind that comes from a car that runs exactly as it should.
Frequently Asked Questions
Do I need to do any programming or flashing myself?
Absolutely not. This PCM arrives at your door fully programmed to your vehicle’s VIN and is ready for a plug-and-play installation. Simply install the unit, and you’re ready to go.
Where do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We will contact you with instructions, or you can message it to us directly through the platform. We cannot ship the part until we have programmed it with your VIN.
Is this a brand new part?
No, this is a genuine, used OEM part that has been carefully sourced from a salvaged vehicle. Each unit is inspected and tested to ensure it’s ready for programming and reliable service in your car.
My original part number is 12586547. Will this work?
Yes. This PCM, service number 12587465, is the correct, updated replacement for older service numbers including 12586547 and 15576920. As long as it is programmed to your VIN, it will function perfectly.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. Erratic shifting, getting stuck in gear, and harsh engagement are very common symptoms of a failing PCM. If your mechanic has diagnosed the issue as electronic, this 2004 Cadillac Seville PCM is the most likely solution.