Restore Peak Performance to Your Cadillac or Pontiac

Is your 2004-2005 Cadillac DeVille, Seville, or Pontiac Bonneville suffering from frustrating engine problems like stalling, poor performance, or a persistent Check Engine light? A faulty Powertrain Control Module (PCM) is often the culprit, disrupting the smooth, powerful ride you expect from your vehicle. This pre-programmed engine computer is the direct-fit, reliable solution to restore your car’s performance and get you back on the road with confidence. We flash this module with the latest GM software updates using your vehicle’s specific VIN, ensuring it works seamlessly with your car’s existing systems.

Common Symptoms & Your Direct-Fit Solution

A failing PCM can cause a wide range of confusing and intermittent issues. If you’re experiencing any of the following, this part is your solution:

• Check Engine Light: Often with communication error codes (U-codes) or internal module failure codes (P0601, P0602, P0603, P0604, P0605, P0606).
• Engine Performance Problems: Rough idling, stalling, hesitation during acceleration, or a noticeable loss of power.
• No-Start Condition: The engine cranks but refuses to start, even with a good battery and starter.
• Erratic Transmission Shifting: Harsh shifts, delayed engagement, or getting stuck in a single gear.
• Poor Fuel Economy: A sudden and unexplained drop in your vehicle’s MPG.

Instead of wrestling with a frustrating diagnosis or paying high dealership prices, our professionally programmed 2004-2005 Bonneville DeVille PCM 12587465 is engineered to be the definitive fix, resolving these issues and restoring the factory-new feel to your vehicle’s powertrain.

Features & Key Benefits

• ✔ VIN-Programmed for Your Vehicle: We flash this module with your car’s unique VIN and the latest GM software, ensuring it’s ready for installation right out of the box.
• ✔ Cost-Effective Solution: Get a reliable, tested component that performs like new without the high cost of a brand-new unit from the dealer.
• ✔ Restores Original Performance: Eliminates common drivability issues caused by a faulty computer, bringing back the smooth power and crisp shifting you expect.
• ✔ Direct-Fit Replacement: This is a genuine GM part (service numbers 12587465, 12586547, 15576920), guaranteeing a perfect fit and correct electronic communication.
• ✔ Quality Inspected: Sourced from a salvaged vehicle, each unit is carefully inspected to ensure it is ready for programming and service.
• ✔ Warranty Protection: This unit is backed by our one-year replacement warranty.

An Expert’s Note on GM Programming

For these specific Cadillac and Pontiac platforms, VIN-specific programming isn’t just a feature—it’s a necessity. The PCM is the brain that communicates with the anti-theft system (Passlock/VATS), the transmission controller, the ABS, and more. Simply installing a non-programmed module from another car will result in a no-start condition. Our process ensures that when you receive your 2004-2005 Bonneville DeVille PCM 12587465, it’s already been electronically matched to your car’s unique configuration, dramatically simplifying the installation process and preventing frustrating compatibility errors.

Frequently Asked Questions